Security Engineer | Infrastructure (Security, Penetration Testing)

About the Network Engineer Internship at Daangn Daangn is looking for a Network Engineer Intern to join the Infrastructure (Network) team in Seoul. This is a 3-month internship designed for those eager to develop technical skills while supporting a platform that connects hyperlocal businesses and users worldwide. Meet the Network Team The Network Team builds and maintains secure, high-performance network services for Daangn customers. The group designs and operates a network environment tailored for both local and global needs. Team members automate routine tasks, monitor traffic flow and network status in real time, and respond quickly to issues. Maintaining service quality during traffic spikes and protecting the platform from security threats are central to the team’s mission. What You Will Do Help design and operate Daangn’s service and office network architecture (cloud, wired, wireless) Assist in designing and operating network security architecture Contribute to the development and operation of network observability and automation platforms Who We’re Looking For Currently pursuing or recently completed a degree in Computer Science, Information Communication, Information Security, or a related field Solid understanding of basic networking concepts, including the OSI model and TCP/IP Knowledge of IPv4 addressing and subnetting Basic experience with physical network devices such as switches and routers Familiarity with network security concepts, including firewalls Ability to use scripting languages like Python or Bash at a basic level or higher Motivated to learn and grow proactively Preferred Qualifications Hands-on experience with AWS or GCP consoles Understanding of REST API calls and integrations Practical experience with networks or infrastructure through personal projects or coursework Knowledge of security principles such as encryption, authentication, and access control Interest in network observability or automation Attention to documentation and willingness to share knowledge within the team Additional Details This internship lasts for 3 months. Daangn gives preference to candidates with disabilities or veterans, in line with the 'Promotion of Employment for the Disabled and Vocational Rehabilitation Act' and the 'Act on the Honorable Treatment and Support of Persons of Distinguished Service.' Applications close on May 3rd, 11:59 PM. The deadline may change depending on circumstances. The expected start date is June 1st, though this may be adjusted if needed.

Join Our Team!The Internal Infrastructure Engineer at Toss CX is a vital member of the General Affairs Team, responsible for establishing and implementing optimal internal infrastructure strategies that align with the rapid expansion of our business.This role transcends basic IT support, as you will enhance our network and security systems based on financial security guidelines, ensuring a safe and engaging work environment for all team members.Your Responsibilities:Design and Stabilize Internal IT Infrastructure: Create a scalable internal network and server infrastructure that matches Toss CX's business direction and organizational size, ensuring reliable operations.Manage Office Network and Security Infrastructure: Optimize and maintain the overall office network architecture, including L2/L3 switches and access points. Implement and manage cutting-edge security solutions like Zscaler, NAC, and WIPS to uphold a zero-trust work environment.Enhance IT Governance and Environment: Lead IT projects to establish an account management system based on Okta and Active Directory, standardizing internal infrastructure and maximizing work efficiency.

About the Team You Will Join The Internal System Engineer position at Toss Securities is responsible for managing in-house infrastructure and IT support, collaborating closely with IT Managers and Internal Network/System Engineers. You will design both wired and wireless networks for the headquarters and remote locations, while integrating user-centric security technologies to create a seamless work environment. Your role will focus on enhancing internal infrastructure and operational efficiency, allowing Toss Securities colleagues to concentrate on their work. Your Responsibilities Upon Joining Establish and operate in-house VDI/HCI/virtualization infrastructure. Oversee the deployment and management of the Horizon VDI environment. Build and manage the necessary servers and HCI infrastructure. Streamline repetitive tasks through automation and scripting solutions. We Are Looking for Someone Who Has experience in building and managing servers based on Windows and Linux. Is capable of establishing and operating hypervisor environments such as VMware and Docker. Can manage VMware Horizon-based VDI environments. Possesses experience in setting up and operating various infrastructure services such as DNS, DHCP, AD, and SMB. Has basic knowledge of NAC, VPN, and DLP technologies. Has experience in establishing and managing monitoring tools like Prometheus, Grafana, and Zabbix. Is proficient in automation development using Python, PowerShell, and Ansible. Journey to Joining Toss Securities Application > Job Interview > Cultural Fit Interview > Reference Check > Salary Negotiation > Final Acceptance and Onboarding Please Note If any false information is found in the resume or if disciplinary actions are confirmed during employment, the recruitment may be canceled. Applicants who fall under the hiring restrictions or disqualifying reasons according to Toss Securities regulations may have their applications canceled. Individuals with disabilities or who are veterans will be given preferential treatment according to relevant laws. A Word for Future Colleagues> "You can experience everything as a System Engineer." - I joined Toss Securities after working as a System Engineer in a mobile service company with large traffic. In my previous role, I managed numerous platforms, but at Toss Securities, I realized I had a superficial understanding of infrastructure operations. Here, I closely collaborate with various departments and gain a comprehensive understanding of the overall architecture. I recommend Toss Securities for System Engineers who are eager to learn, passionate about their work, and seeking the best environment for a career quantum leap!

About the Role tosscareers is hiring an Infrastructure Automation Engineer in Seoul. This role focuses on building and maintaining automated systems that improve the efficiency and reliability of IT services. The position involves hands-on work designing, implementing, and supporting infrastructure automation. What You Will Do Design automated solutions for managing infrastructure Implement and maintain automation tools and workflows Support the stability and scalability of IT services through automation Who We’re Looking For Experience or strong interest in cloud technologies Familiarity with automation tools and systems Motivated to improve IT operations through automation

Role Overview Toss Careers is hiring a Systems Engineer to strengthen our backup infrastructure in Seoul. This position focuses on building, maintaining, and improving backup systems that protect critical data and support business continuity. What You Will Do Design, implement, and maintain backup solutions to safeguard company data Work with teams across the company to troubleshoot and resolve backup-related issues Monitor and optimize backup system performance Identify areas for improvement and help refine backup processes over time Location This role is based in Seoul.

At Sendbird, we merge omnichannel AI with world-class, validated communication APIs to empower businesses in creating AI agents that enable meaningful customer connections at scale.Sendbird offers solutions with enterprise-level stability, security, and compliance. Over 4,000 leading global apps, including DoorDash, Match Group, Noom, and Yahoo Sports, trust Sendbird, facilitating over 7 billion conversations monthly through our platform.To date, we have raised a total of $220 million in funding from top-tier Silicon Valley investors, including ICONIQ, SoftBank, Tiger Global, and Y Combinator, and we are the first global unicorn company in Korea with a valuation exceeding 1 trillion won. Our headquarters in San Mateo, California, along with R&D centers and offices in Seoul, APAC, New York, London, Singapore, India, and Canada, reflect our global reach.Internship Opportunity: AI Agent EngineerThe AI Agent Engineering Intern will collaborate with engineering and product teams to build, integrate, and deploy intelligent agents. Throughout the internship, which lasts between 8 to 12 weeks, you will gain hands-on experience from prototyping to production using the latest web frameworks, LLM APIs, and tooling pipelines.Key Responsibilities:Agent Prototyping and DevelopmentDevelop micro-APIs for tasks such as hallucination detection and conversation resolution through prompt engineering.Test and validate the accuracy of AI agents using internal datasets and tools.Integrate backend APIs that support retrieval-augmented generation (RAG), knowledge bases, and custom toolchains.Prompt Engineering and ToolingCreate, test, and fine-tune prompts for various use cases.Establish CI/CD pipelines for prompt versions and agent deployment.Integration and DeploymentEmbed agents into web, chat, and API-centric environments.Implement observability features like logging and dashboards to monitor real-time performance metrics.Collaboration and DocumentationFacilitate close collaboration among team members, including senior engineers, product managers, and UX designers.Ideal Candidate:Proficient in Python with experience in writing clean and maintainable code.Hands-on experience in backend development using server-side frameworks like Django, FastAPI, or Express.Excellent communication skills and experience in collaborative environments, especially in agile teams.Preferred Qualifications:Experience with prompt engineering frameworks (e.g., LangChain).Understanding of cloud platforms (AWS Lambda, Vercel, GCP Cloud Functions).Experience in AI product-related UX design or product management.Familiarity with Django or similar Python web frameworks.What You Will Gain:Deep insights into cutting-edge agent-based AI development and system deployment.Cross-functional collaboration with engineering, product, and design experts.Mentoring from senior AI engineers, with opportunities for full-time transition.Experience with real customer use cases, performance tuning, and production-grade tool utilization.Flexible Work PolicySendbird supports flexible working schedules. Given the importance of collaboration and teamwork, all team members work together in the office at least three days a week. Some roles may require more frequent office attendance, so please discuss specific requirements with your manager.

Join Our Innovative TeamThe Machine Learning Engineer (Infra) will be part of the ML Platform Team within the Product Division at Toss Securities.The primary goal of the ML Platform Team is to create an optimal machine learning platform that enables the efficient and stable development and operation of various AI/ML services at Toss Securities.The ML Engineer (Infra) will focus on maximizing the efficiency of large-scale AI infrastructure, finely controlling resource usage, and enhancing infrastructure performance to its peak. Your Responsibilities Design and operate high-performance AI computing environments reliably.Design and operate top-of-the-line GPU clusters (H100, B300 series) connected via InfiniBand and high-performance storage (400Gbps) within a Kubernetes environment.Beyond merely building infrastructure, optimize networks and storage to extract the full potential of hardware performance. Develop a comprehensive control system for the entire AI infrastructure.Create an observability system to integrate and monitor AI resources distributed across internal infrastructure and external cloud.Implement management features to prevent resource monopolization by specific services and allocate resources precisely based on importance. Create automation tools for the most efficient resource usage.Analyze actual usage patterns to develop tools that recommend 'just-right resources' to avoid waste.Implement features that automatically scale up or down based on real-time model performance or error rates, and reallocate GPUs where necessary. Establish an environment for identifying and resolving model performance bottlenecks.Build profiling environments to accurately pinpoint slowdowns during model training or serving.Support the analysis and improvement of performance degradation causes between hardware and software. Who We Are Looking ForYou have experience building and operating Kubernetes-based ML infrastructures that handle large-scale traffic.You take responsibility for reliably operating live services beyond simple development.You have experience persistently analyzing and debugging to resolve root causes when issues arise.You possess a solid understanding of system resources (GPU/CPU/Memory/Network/Storage) and have experience building monitoring systems for them.You value the process of solving various problems that arise during service operations and strengthening the system. Preferred QualificationsExperience in unified monitoring of resource usage in large-scale clusters.Experience building systems to systematically control resources through Quota and Rate Limits.Experience with open-source platforms like Kubeflow or Kubernetes, including in-depth modifications as needed.Experience analyzing and optimizing bottlenecks at the kernel level using tools like Nsight Systems/Compute or PyTorch Profiler.Experience designing tasks to reduce costs or enhance performance tailored to workload characteristics (Rightsizing, Cost Optimization).Experience leveraging GPU virtualization technologies like MIG and MPS to maximize resource utilization.

Join Our TeamWe are on the lookout for talented individuals who are eager to contribute to setting the global standard for video understanding AI! At twelve-labs, we are developing cutting-edge AI models that efficiently process vast amounts of video data, offering specialized search, analysis, summarization, and insight generation capabilities.Our models are utilized by the world’s largest sports leagues, enabling them to quickly and accurately select highlights from extensive game footage, providing a super-personalized viewing experience. In South Korea, integrated control centers leverage our technology to efficiently explore CCTV footage, responding swiftly to crisis situations. Major broadcasters and studios worldwide employ our models to create content for billions of viewers.As a deep tech startup with offices in San Francisco and Seoul, twelve-labs has been recognized as one of the top 100 AI startups globally by CB Insights for four consecutive years. We have secured over $110 million in funding from renowned VCs and enterprises, including NVIDIA, NEA, Index Ventures, Databricks, and Snowflake. Notably, our AI models, developed in Korea, are the only ones available through Amazon Bedrock. We thrive on creating innovative products with exceptional colleagues and growing alongside our global clientele.At twelve-labs, we operate based on core values that include:A reflective and honest attitude towards oneself and the teamResilience and humility in the face of failure and feedbackA commitment to continuous learning to enhance the team’s capabilitiesIf you enjoy solving challenging problems and growing through the process, the opportunity is here at twelve-labs.About Our TeamOur Infrastructure Team believes that 'data determines the performance of AI models.' We build high-quality data pipelines for the training and evaluation of multimodal AI models end-to-end. We collect, filter, process, and label diverse multimodal data, collaborating with various teams to design training data that can uncover new model capabilities. Additionally, we create evaluation datasets that reflect actual user experiences and develop internal tools to streamline these processes continuously.Your RoleAs an Infrastructure Engineer at twelve-labs, you will design and build core infrastructure to ensure the stable and scalable operation of our AI SaaS platform. You will work with system architectures across various cloud and on-premise environments, constructing robust infrastructure that supports our video AI foundation models. In our rapidly evolving startup environment, you will optimize performance, security, and flexibility while closely collaborating with multiple internal teams.Key ResponsibilitiesDesign and operate multi-tenant architecture for global enterprise clientsDevelop automation and scalable CI/CD pipelines using TerraformBuild flexible infrastructure encompassing various cloud environments such as AWS, GCP, and Azure, as well as on-premisesOptimize secure and efficient cloud infrastructure through advanced monitoring and security systemsDesign scalable architecture to rapidly support new video AI models and servicesCollaborate with PMs, engineers, and researchers to bring AI products to fruitionIdeal CandidateExperience in building and operating infrastructure in cloud environments such as AWS, GCP, or AzureProficiency in using IaC tools like Terraform and Ansible for automation and architecture designFamiliarity with Kubernetes and container orchestration

Welcome to the Journey of Joining the Daangn Team!At Daangn, we are committed to fostering an environment where individuals can grow alongside the company's success.Our recruitment team is here to assist you in achieving those joyful moments of collaboration with amazing colleagues. Introducing the ML Infrastructure TeamThe ML Infrastructure Team within our Infrastructure Department is responsible for developing a robust and scalable machine learning infrastructure that ensures effective service delivery and efficient operation of Daangn’s machine learning-based services. Machine learning is extensively utilized at Daangn to enhance service quality and improve user convenience across various domains, including feed recommendations, ad recommendations, and service operations. The ML Infrastructure Team handles everything from data processing, model training, model serving, to the deployment processes necessary for machine learning service development. Daangn's GenAI Platform Building Serverless ML Training Infrastructure: Vertex AI Pipelines & TFX ML Infrastructure with GCP | 2025 Daangn GCP MeetupYour ResponsibilitiesDevelop and manage model servers and serving systems for efficient deployment of various machine learning models.Develop and maintain ML infrastructure SDKs, frameworks, and training systems used across the organization.Create specialized monitoring systems for machine learning services to detect quality changes early.Implement various optimization methods across the machine learning infrastructure to enhance development iteration speed and resource efficiency.We Are Looking ForA proficient user of one or more programming languages such as Python or C++.Strong understanding of the infrastructure required for training and serving machine learning models.Over 7 years of experience in backend service or machine learning service development/operations.A desire to improve machine learning infrastructure through solid software engineering skills.Experience in developing and operating GPU clusters.Preferred QualificationsFamiliarity with cloud services like AWS and GCP, with practical experience.A deep understanding of the machine learning ecosystem and contributions to open source projects (e.g., TensorFlow, PyTorch, TensorFlow Extended).A keen interest in new technological trends and a willingness to learn.Additional InformationFor full-time hires, there is a 3-month probation period.We prioritize individuals with disabilities and veterans according to the Employment Promotion and Vocational Rehabilitation Act and the Act on the Honorable Treatment and Support of Veterans.Application Process1. Document Screening → 2. Video Interview → 3. Technical Interview → 4. Culture Fit Interview and Reference Check → 5. Compensation Negotiation → 6. Final Acceptance and OnboardingGo to Daangn Joining Journey Guide

Toss Securities is seeking an IDC Infrastructure Engineer (Network & System) to help build and maintain the backbone of our data center operations in Seoul. This position focuses on ensuring the stability, efficiency, and continuous improvement of our large-scale infrastructure, covering everything from network design to physical equipment and operational processes. The role is primarily based at our modern data center (IDC), working closely with a team of network and system engineers. What you will do Design hardware architectures for network and server infrastructure, including equipment selection and implementation standards. Develop data center network architectures (such as Spine-Leaf and redundancy) and server/storage configurations. Define technical standards for bandwidth, NIC specifications (10G/25G/100G/400G), cabling (OM, LR/SR, MPO), and switch port setups. Plan physical infrastructure, taking into account rack space, power, and environmental needs. Set and manage organization-wide standards for equipment models, firmware, and configuration templates. Install, configure, and operate servers, storage, and network equipment on site, driving ongoing improvements. Oversee equipment transport, installation, and relocation, ensuring quality and safety throughout the process. Coordinate with contractors for cabling and equipment setup, maintaining technical standards and quality control. Monitor the IDC environment (power, temperature, network, equipment status) and respond proactively to anomalies. Lead first-level incident response and root cause analysis, working to prevent recurrence and resolve complex issues across network, system, and physical layers. Manage the lifecycle of IDC assets, ensuring data integrity and optimizing long-term operational plans for capacity, power, and space. Collaborate with colocation service providers and partners to manage schedules, quality, and costs. Automate repetitive operational tasks, such as firmware upgrades and configuration deployments, and build monitoring/CMDB integrations using SNMP and REST API. Establish and refine operational standards, procedures, and policies for ongoing efficiency. Requirements At least 5 years of experience in data center (IDC) or infrastructure design and operations. Experience designing data center network architectures (Spine-Leaf, redundancy, etc.). Understanding of server/storage hardware and operating systems (Linux, Windows, Hypervisor). Ability to design at the hardware level, with knowledge of NICs, cabling, and switch ASICs. Experience with IDC space planning, rack layout, power, and space design and operations. Background in large-scale equipment installation, relocation, and asset management within IDC operations. Problem-solving skills that address both physical and logical aspects of incidents. Strong communication skills for effective collaboration with contractors and internal teams. Experience with equipment implementation proof-of-concept (PoC), vendor evaluation, and performance validation. Proven ability to create infrastructure standard documents, such as design guides and operational procedures.

About the Team You Will JoinThe Security Infrastructure team is dedicated to designing security architectures that ensure the safe expansion of Toss's business, implementing and automating these architectures in real-world environments.This team covers cloud, network, and endpoint security, directly designing and implementing security policies and controls based on key infrastructure.We select technology stacks, create log architectures, and access control models, building a structure that defends against actual threats rather than merely implementing security for security's sake.Our team consists of members with diverse experiences, primarily from corporate information security roles and specialized information protection companies.We are looking for individuals who start with the question of “Why?” to improve security structures and design safer, more efficient methods while balancing technology and business needs.Responsibilities You Will UndertakeDevelop and manage information security solutions that protect Toss's services and employee environments.Establish and operate an access control system for internal information systems.Build a network separation environment and information leak response systems in accordance with financial compliance.Plan and operate systems to enhance security visibility and access control systems.Conduct modern threat analysis and incorporate global trends while establishing AI-based detection and analysis systems and real-time response strategies.Additional ResponsibilitiesDesign, build, and operate infrastructure security architectures across cloud (AWS/GCP/Azure) and on-premises/hybrid environments, covering networks, servers, databases, and containers. You may focus on either cloud or network based on your strengths.Design and reliably implement core security policies like IAM, network segmentation, access control, and encryption (KMS) in real environments.Structure repetitive security operations based on IaC and automation while collaborating with other teams to establish actionable security standards.Analyze security events and breach incidents to design and fundamentally improve security structure, policies, and automation.Ideal CandidateWe are searching for individuals with over 3 years of relevant experience.You should have experience dealing with infrastructure across cloud, network, and systems, not limited to one area.Experience in enhancing detection and response systems using security solutions like CSPM/CNAPP, SIEM, EDR, WAF, and KMS is essential.Experience in designing or improving operational efficiency through security automation and IaC with tools like Terraform/CloudFormation, Ansible, and Python is required.You should have experience interpreting and integrating security requirements in financial and regulatory environments (ISMS-P, ISO27001, PCI-DSS).

Daangn is seeking a Frontend Software Engineer Intern to join its real estate platform team in Seoul. This internship offers the chance to work alongside experienced developers and contribute to projects that influence how people interact with real estate online. What you will do Work closely with the engineering team to build and refine frontend features for the real estate platform. Write, review, and maintain code with guidance from seasoned developers. Support efforts to enhance user experiences related to property search and discovery. Location This position is based in Seoul.

# Duration: 6 Months (Recruitment-Linked)# Salary: 4,000,000 KRW per month Join the Fastest Growing B2B SaaS in Asia ChannelTalk is an all-in-one AI messenger dedicated to fostering sustainable growth for businesses. We enable seamless communication with customers anytime, anywhere, ensuring that businesses can derive their direction from customer interactions. Guided by the philosophy that 'the customer is the answer', we are transforming customer communication experiences for over 200,000 clients across 22 countries worldwide. Having successfully addressed fundamental challenges in online business, we are rapidly expanding beyond South Korea, with over 25% of our revenue already generated from global markets. Building on our product's reputation in Asia, we aim to evolve into a global SaaS leader with offices in Seoul, Tokyo, and New York. In just seven years since the launch of ChannelTalk, our success can be attributed to our exceptional product. We believe that a great product drives the best sales and marketing efforts. Our goal is to create a 'future classic' product, akin to Google Search or the iPhone, working alongside top talent in the industry. The ChannelTalk development team thrives on finding answers through customer conversations. We engage in product planning and design, driving growth based on our innovative offerings. This path is not easy; it requires addressing the complex challenges faced by a rapidly growing global business. However, we are a team of problem solvers who embrace these challenges, delivering impactful results. We are actively seeking engineers who can tackle diverse challenges in areas such as information retrieval, distributed computing, large-scale system design, networking and data storage, security, artificial intelligence, natural language processing, design systems, and mobile. You will work on critical projects that the Channel team must resolve. As we embark on this journey together, we are proud to offer an internship position with industry-leading compensation (4,000,000 KRW per month). If you demonstrate rapid growth and performance, there is potential for full-time employment. If you are excited by discovering new problems and finding answers that have never been solved before, please apply without hesitation! Curious about the Channel team?• ChannelTalk Tech Blog• ChannelTalk YouTube

Join Daangn as a Frontend Software Engineer Intern and contribute to creating exceptional user experiences for our platform. This is an exciting opportunity to work under the guidance of seasoned professionals in a dynamic environment.

Have you ever wondered when you can truly engage in hands-on work? Join us now.- As a Security Engineer, you'll have the chance to work with real infrastructure from the start, going beyond operations to consider structural design and automation.- Even if you lack practical experience, if you have a solid foundation, you can achieve rapid growth and success alongside the best teammates!# Please Confirm Before Applying- It's completely fine if you don't have hands-on experience. If you have a willingness to learn and a desire to grow your career, we encourage you to apply.- Be sure to include the three mandatory items listed in your resume.- The candidates who succeed in this hiring process will be working within the Security Infrastructure team.# About the Team You'll Join- The Security Infrastructure team designs security architecture to ensure that Toss’s business can expand safely, applying and automating it in real environments.- We handle a broad spectrum including cloud, network, and endpoint, designing and implementing security policies and control frameworks based on key infrastructures.- We select technology stacks and create log architectures and access control models, building a structure that defends against real threats rather than just 'security for the sake of security'.- Our team members come from diverse backgrounds, most having experience in corporate information security roles and specialized information security firms.- We're looking for individuals who start with the question “why?” to improve security structures and design safer, more efficient methods while balancing technology and business.# Your Responsibilities Upon Joining- Operate security solutions across networks, endpoints, and systems while gaining hands-on experience in real infrastructure environments.- Engage directly with issues by conducting security configuration checks, log analysis, and responding to incidents.- Improve repetitive tasks and enhance operational efficiency by utilizing automation tools and AI.- Collaborate with seasoned colleagues, gaining practical experience and creating a rapid learning curve together.# We Want to Work with Someone Who- Has a relevant major such as Information Security or Computer Engineering, or has a solid foundation through equivalent learning.- Can explain the operating principles of infrastructure components like networks, servers, and operating systems.- Has experience in automation or small development projects through API integration and scripting.- Goes beyond mere task execution to understand structures and attempts improvements for personal growth.- Has invested time in activities such as security projects, challenges, or community engagement to grow as a security engineer.# Required Information for Your Resume- Detail your experiences where you’ve actively engaged in security or infrastructure. If you have links such as Notion or GitHub that showcase your work, please include those.- Write about experiences where you learned and applied specific technologies. Focus on what sparked your curiosity, what challenges you faced, what actions you took, and what you learned.- It's fine if the results weren't perfect; it's sufficient to highlight difficulties you encountered, points you felt were failures, and what you would change if you were to try again.# The Journey to Joining Toss- Document submission > Technical interview > Cultural fit interview > Reference check > Compensation negotiation > Final offer and onboarding.# A Message for Future Colleagues> "You can enjoy working as a Security Engineer in an environment where innovative technologies are applied, and grow together!"- The Security Infrastructure Team is dedicated to identifying security threats to our assets, reducing risks, and designing control structures based on threat levels. Throughout this process, we strive to balance security and productivity. We implement controls using technology while making rational decisions.- Our team is filled with colleagues who ponder difficult problems together and seek solutions. The supportive environment where we acknowledge and encourage each other's efforts is truly wonderful. If you join our team, I am confident we can help each other create better security solutions!

About the Team You'll Join- The Infra Engineering Tribe is an engineering organization at Toss that designs and operates the network, systems, and infrastructure to ensure the stable operation of various Toss services.- The Systems Engineer team goes beyond mere maintenance; we fundamentally improve infrastructure structures, eliminate root causes of failures, and establish infrastructure strategies suitable for the introduction of new services and technologies.- Our goal is to ensure that all Toss services possess scalability and stability.The Challenges We're Tackling Together- We operate a large-scale on-premises infrastructure that reliably processes millions of financial transactions.- We design computing environments for diverse workloads (GPU, analytics, ML, etc.).- We analyze root causes during incidents and prevent recurrence through structural improvements.- We design and standardize service architectures that guarantee high availability and scalability.- We operate and optimize data infrastructures based on DW, Data Mart, and Data Lake.- We plan and internalize operational tools, automation, and monitoring systems.Your Responsibilities Upon Joining Us- You will design, build, and reliably operate on-premises-based infrastructure.- You will define issues in complex infrastructure environments and derive optimal solutions.- You will lead system improvements while collaborating with various teams such as data, platform, and security.We're Looking for Someone Who- Has experience operating large-scale Linux servers and network infrastructure.- Is proficient in quickly identifying issues and designing structural solutions.- Has experience in operational automation using scripts such as Python and Bash.- Has experience responding to incidents using open-source monitoring and logging tools.- Can effectively communicate and collaborate with diverse stakeholders. GPU and ML Infrastructure Experience- Experience operating and enhancing GPU Clusters (Slurm, Kubernetes, etc.) is a plus.- Experience supporting ML Ops environments with tools like Kubeflow, MLflow, Airflow is favorable.- Experience with scheduling, monitoring, and resource optimization for AI/ML workloads is advantageous. Data Infrastructure Experience- Experience operating Data Warehouses, Data Marts, and Data Lakes is a plus.- Experience managing distributed data processing infrastructure based on Hadoop and Spark is advantageous.- Experience designing and enhancing hardware for large-scale data processing systems is a plus.- Experience operating Kafka-based data pipeline infrastructure and responding to incidents is beneficial.# Resume Recommendations- Please provide detailed examples of at least two complex problems you defined and solved (focusing on root cause analysis, solution approaches, results, and infrastructure changes).- Detail the projects you contributed to (including project duration, role, technologies used, infrastructure structure, and improvements made).# Journey to Joining Toss- Application Submission > Job Interview > Cultural Fit Interview > Reference Check > Compensation Discussion > Final Acceptance and Onboarding.# A Message for Future Colleagues> "You can experience all aspects of being a System Engineer."- We are looking for individuals who can face complex problems, define them clearly, and solve them optimally. If you want to help innovate infrastructure at Toss, please apply now!

SanDisk seeks a Backend Intern for the Autumn Semester CY26 in Seoul. This internship is designed for students who have an interest in backend development and data storage technologies. Role overview Interns will join technical teams and contribute to real projects focused on backend systems. The position offers a chance to work directly with experienced engineers and see how backend solutions support data storage products. What you will do Collaborate with engineers on active projects Support backend development tasks Build practical skills in data storage technologies Work environment This internship emphasizes hands-on learning and teamwork. Interns are encouraged to take part in ongoing work and engage with technical staff in a busy, collaborative setting.

Join Our Dynamic Team! The DevOps team at Zoyi is dedicated to enabling the product teams to swiftly and reliably deliver value through the establishment and management of a trustworthy infrastructure and self-service development platform.As the closest technical partner to the ChannelTalk product team, we tackle the repetitive and complex issues that arise during development, deployment, and operations, solving them through platform enhancements and automation.We are not merely a support organization for specific teams; instead, we standardize proven methodologies from the field to create a foundation that allows all product teams to independently develop, deploy, and monitor their applications.If you’re eager to enhance the intersection of technology and organizational practices across infrastructure, platforms, and products, we invite you to apply to the DevOps team!

Join Our Team The System Engineer at Toss Securities is part of the System Engineering Team alongside InfraOps Engineers. We build and support systems for both external and internal clients, managing our data center infrastructure. Our team collaborates with top talent in various domains like finance, commerce, portals, and gaming. We aim to support product focus by developing infrastructure that can handle large-scale traffic, while also pushing for automation to accelerate product delivery. Key Responsibilities Manage servers, operating systems, SAN, storage, and backup systems, ensuring robust infrastructure for customer service systems. Allocate necessary server equipment and integrate services when launching new offerings. Operate and manage both IDC and public cloud infrastructure. Who We Want 5+ years of experience in system engineering on Linux OS environments. Proficient in scripting languages (Shell, Python, Perl, Ruby, etc.) to facilitate infrastructure operations in collaboration with developers. Experience in architecting and managing public cloud platforms (AWS). Strong handling of Linux systems and a solid understanding of business implications relevant to our services. Experience in building and operating system automation deployment solutions is a plus. Application Tips Detail two memorable instances of technical problem resolution (e.g., optimization, bug fixes). Provide detailed accounts of projects you've contributed to, including duration, role, tech stack used, and improvements achieved. List the versions of the OS and key solutions you have managed. Journey to Joining Toss Securities Application Submission > Job Interview > Cultural Fit Interview > Reference Check > Compensation Negotiation > Final Offer and Onboarding