Payment Software Engineer

Join Our AI Transformation TeamOur dynamic AI Transformation Team is dedicated to tackling intricate engineering challenges through innovative machine learning techniques, transitioning these solutions into impactful real-world applications. We specialize in creating agent systems designed to automate problem-solving, constantly refining and enhancing our approaches.Our mission is to seamlessly connect research with practical application by constructing platforms that utilize agentic AI for tangible engineering solutions.Key ResponsibilitiesArchitect and develop the foundational infrastructure for our Agent System Framework.Implement essential components of the agent runtime, focusing on orchestration, context management, tool execution, and memory abstraction.Work alongside cross-functional teams to quickly prototype and scale new agent functionalities into production environments.Design and enhance developer-friendly interfaces including CLI tools and SDKs.Minimum QualificationsA Bachelor’s degree in Computer Science, a related technical discipline, or equivalent practical experienceProven experience in at least two of the following areas:Designing and managing distributed systems or extensive backend systems.Building and deploying machine learning/AI systems, particularly those based on LLMs, in a production setting.Developing agent systems, workflow engines, or orchestration frameworks.Backend development proficiency in Python, Go, or C++.Preferred QualificationsMaster’s or PhD degree in Engineering, Computer Science, or a related fieldDemonstrated success in designing and implementing agentic AI system frameworks in real-world or large-scale contexts.Hands-on experience in developing LLM-based applications (e.g., for tool utilization, planning, reasoning systems).Experience in creating developer tools, such as CLI or SDKs.Contact UsFor inquiries, reach out to us at: recruit@furiosa.ai

About the RoleAt Furiosa AI, we are committed to enhancing the productivity of our compiler team by systematically designing and continuously improving our CI and development workflows.In this role, you will focus on transforming CI into a more reliable, efficient, and user-friendly system through the development of developer productivity tools, including CI orchestrators.Our compiler team executes large-scale tests across multiple clusters to optimize model performance in terms of both time and energy. Within this context, CI operates not merely as a pipeline executor but as a sophisticated orchestration system that coordinates complex workloads and resources, demanding high reliability and automated recovery capabilities.Aim for engineering that defines and resolves problems rather than simple operations.Engineers are encouraged to analyze issues independently and propose improvement directions.Important decisions are made collaboratively within the team.Improve both development productivity and stability through practical approaches.

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.

Key ResponsibilitiesDevelop and implement firmware solutions for Furiosa devices, ensuring optimal performance and reliability.Create and maintain device drivers tailored for Furiosa hardware, enhancing system integration.Establish testing frameworks to ensure the highest quality standards for firmware and device drivers.

Key ResponsibilitiesDevelop and sustain ROM code along with software for early system initialization.Port and tailor Arm Trusted Firmware (TF-A / TF-M) to meet project needs.Implement essential system trust primitives including Secure Boot, firmware updates, and RoT components.Work closely with hardware teams for effective SoC bring-up, low-level debugging, and silicon validation.Design system-level software with a focus on performance, reliability, and security requirements.

Join us at the forefront of agentic AI, where you'll be part of a team that builds intelligent systems capable of deep understanding. At Sendbird, we are not just developing prototypes; we are deploying AI solutions at scale that genuinely think and adapt.About SendbirdSendbird is committed to shaping the future of AI-driven customer interactions. With over a decade of experience in creating robust infrastructures for chat, voice, video, and messaging APIs, we've established ourselves as the leading CPaaS platform for in-app communications. Trusted by over 4,000 brands and facilitating 7 billion messages monthly, we connect 300 million active users.Our clients include industry leaders like DoorDash, Match Group, Noom, Yahoo Sports, and Rakuten. Our track record speaks for our expertise and excellence.Recognizing the transformative potential of AI in customer communication, we pivoted to an AI-first strategy in December 2024, launching our AI agent for enterprise customer experience by February 2025. Our rebranding to Delight.ai in November 2025 encapsulates our mission: to not just enhance efficiency, but to restore the essence of personalized service—creating delightful experiences for customers.About Delight.aiDelight.ai acts as the AI concierge for customer interactions, ensuring continuity and understanding across various channels. Unlike other AI agents, our solution retains memory, learns individual preferences, and maintains context—delivering a truly personalized experience.Why Join as a Senior Software Engineer, AI Agent?In an industry filled with superficial solutions, Sendbird's AI Agent platform stands out for its robustness, scalability, and genuine intelligence. This is not just maintenance work; you'll shape the core platform, designing orchestration, RAG pipelines, evaluation, and observability that will impact millions of customer interactions for years to come.

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!

Join Furiosa AI as a Software Engineer focused on Developer Experience! In this role, you will collaborate with cross-functional teams to enhance the development workflow, tools, and processes that empower our engineering teams. Your contributions will be pivotal in creating efficient and high-quality software solutions that drive our mission forward.

Join daangn as a Backend Software Engineer and be part of a dynamic team dedicated to revolutionizing the commerce landscape. In this role, you will work on innovative backend systems that enhance user experience and operational efficiency.

About HopaeAt Hopae, we are dedicated to creating the most reliable digital identity platform in the world—one that is private, secure, and designed for real-world applications.We believe that individuals should have control over their own identities, free from outdated systems and centralized control.Our innovative technology facilitates instant, privacy-focused verification for users and businesses globally, spanning sectors such as fintech, credentials, supply chain, and gaming.Supported by leading global investors, Hopae operates not only in Seoul but also in Paris and San Francisco, harnessing a diverse team of talent from over 10 nationalities.We prioritize speed, global thinking, and the development of products that will shape the future of identity. Why You’ll Love Working HereGlobal DNA: Collaborate with outstanding professionals across Seoul, Paris, and San Francisco.High Impact: Contribute to technology that is redefining trust and identity on a global scale.Ownership Culture: Experience a work environment with no micromanagement—where trust and accountability are paramount.Elite Standards: Thrive in a fast-paced environment where learning and growth are encouraged alongside world-class colleagues.Inclusive & Respectful: Join a team with over 10 nationalities, bringing diverse perspectives united by a common vision.Growth Mindset: Benefit from mentorship opportunities, leadership visibility, and lifelong learning. Your ResponsibilitiesAs a Backend Engineer, your coding expertise will underpin the security and connectivity of digital identities for users around the globe.Design and Develop Global Authentication Platform: Take charge of building and maintaining the core backend systems and high-availability infrastructure for the hConnect platform.Integrate with Diverse Identity Systems: Create and enhance modules that connect with national electronic ID (eID) systems and various identity services globally.Build Scalable Systems: Ensure system stability while progressively enhancing capabilities to accommodate future traffic growth and feature expansions.Design Flexible and Scalable APIs: Develop and maintain robust APIs for seamless integration with both internal services and external partners.Foster a Strong Code Culture: Collaborate with your team to cultivate a culture of quality code.

Join our innovative team at daangn as a Backend Software Engineer, where you'll be responsible for developing robust backend systems that power our lessons and tutoring services. You will work with cutting-edge technologies to enhance user experience and drive our mission forward.

About the RoleAt FuriosaAI, we are dedicated to advancing high-performance and energy-efficient AI systems through our innovative compiler technology. As deep learning models continue to diversify and evolve, the challenges of compilation become more complex. Our mission revolves around transforming these models into optimized executable programs while ensuring the integrity of their meaning and structure.We believe in establishing robust abstractions and well-organized compiler logic instead of relying solely on heuristics. This foundational approach ensures consistency in correctness, scalability, and performance throughout the compiler.In your role as a middle-end engineer, you will significantly influence the design of these abstractions and the operational framework of the compiler. This position demands a blend of analytical reasoning and innovative problem-solving to navigate the intricate challenges of compilation. Your contributions will be vital in creating a compiler that is both principled and pragmatic.

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

Join the daangn Team!At daangn, we strive to create an environment where individuals can grow alongside the company. The daangn recruitment team is here to help you connect with amazing colleagues and tackle exciting challenges together. About the iOS Engineer RoleThe iOS engineers at daangn are part of a dedicated chapter, collaborating closely within their teams. Within the iOS chapter, we prioritize building high-quality applications, as they are the first interaction point for our users. We take great responsibility in ensuring stability and delivering a polished service.The iOS chapter places equal importance on both company growth and individual development. Through activities such as Engineering Day, code reviews, and tech talks, we share our technical skills and domain knowledge while collectively brainstorming improvements. We also host study groups and seminars to foster a better development culture and support personal growth in iOS development.Your Responsibilities[Used Goods Trading Team]Develop a location-based used goods trading service targeting users in Korea and globally.Manage over 10 million products worldwide, creating solutions that address user issues and align with company goals.Enhance the user experience in used goods trading by experimenting with diverse ideas based on data. [Mobile Team]Operate new and shared services to make daangn Market the best local app.Support the easy development of various services and enhance productivity through improved development environments.Design a sustainable architecture for building a super app and tackle various technical challenges. [Common Responsibilities]Participate in iOS chapter activities such as Engineering Day and Tech Talks.Develop various features contributing to daangn services.Who We Are Looking ForIndividuals with at least 3 years of experience in iOS development.People who enjoy designing and implementing new features.Candidates with a user-centric mindset over a purely technical approach.Self-motivated individuals who excel in communication.Familiarity with writing testable code.Preferred QualificationsExperience in developing large-scale services.Contributions to iOS-related open-source projects or personal open-source projects.Experience in global services.Experience in designing code using Dependency Injection (DI).Additional InformationFull-time employment includes a 3-month probation period.We prioritize applicants with disabilities or veterans according to the Employment Promotion and Rehabilitation Act.Tools we currently use include: RxSwift, FlexLayout, PinLayout, and many others.

About the Team The Sales Platform Team at Toss focuses on developing the technology that supports Toss’s B2B business. The team works to create and maintain systems that help drive business growth. Role Overview The Sales Systems Engineer will work hands-on with sales-related platforms, including Salesforce. This position plays a key part in shaping the tools that support sales operations and data management. Main Responsibilities Work directly with sales systems, such as Salesforce, to support business goals Partner with Business Analysts to design and build data infrastructure for extracting business insights Manage and maintain sales data for the company Location This role is based in Seoul.

Join Our Team! The Finance Data System Developer at Toss Bank will be part of the Finance Data Platform Team within the Data Division. This team is responsible for managing management accounting and financial ALM simulation systems. We utilize the Hadoop Ecosystem and open-source environments to manage finance data. Your Responsibilities: Collaborate closely with the financial analysis team to design and manage management accounting systems. Work in tandem with the financial ALM team to design and develop ALM simulation systems. Engage in workflow development and automation tasks using Hadoop Ecosystem and open-source solutions. Ideal Candidate: Experience in management accounting or ALM system management within the financial sector is required. Proficiency in implementing business logic using Java or Python is essential. Strong SQL skills are necessary. Experience in designing marts and scheduling for financial analysis or ALM is preferred. Experience in developing management accounting or ALM systems utilizing Frontend/Backend technologies is a plus. Familiarity with data processing technologies in the Hadoop ecosystem is advantageous. Resume Tips: Please include the following in your application: a description of a problem you solved through automation or with a new approach, and an experience where you deeply learned a new technology. Join the Toss Bank Journey: Application Submission > Job Interview > Cultural Fit Interview > Reference Check > Compensation Discussion > Final Offer and Joining. Important Notes: False information in your resume or disciplinary issues in your work history may lead to cancellation of your application. Candidates with disqualifying factors as per Toss Bank’s employment regulations may also have their applications canceled. Individuals with disabilities and national veterans are given preference according to relevant laws.

Role OverviewJoin Furiosa AI as a Software Engineer specializing in Drivers and Runtime for Windows. In this role, you will be a key player in developing vital components of our AI software stack tailored for Windows environments.Key ResponsibilitiesLead the development of Drivers and Runtime systems that are integral to our AI software on Windows.Collaborate closely with Product Managers and Hardware/Platform developers to ensure seamless integration.Implement functionality for transferring and receiving models, data, and inference results to and from hardware.Develop features for monitoring hardware status, including temperature and error management.Oversee the abstraction of hardware from a cloud platform software perspective.QualificationsMinimum RequirementsBachelor's degree in Computer Science or a related field.Proficiency in C/C++ programming.Knowledge of Windows kernel drivers and system programming.Strong interest in operating systems and hardware architecture.Excellent communication skills.Preferred QualificationsExperience in Windows system programming or driver development.Familiarity with WinDbg and Win32 API.Experience with reverse engineering.

CLO Virtual Fashion is at the forefront of digital fashion, offering a comprehensive suite of services from concept to design, manufacturing, marketing, fitting, and styling, all based on cutting-edge 3D garment simulation algorithms.Founded in 2009, CLO Virtual Fashion is creating a new ecosystem for digital fashion. Our software, including CLO, Marvelous Designer, and Jinny, alongside platforms such as CLO-SET and CONNECT, are designed to streamline the workflow for fashion development while ensuring sustainability.As a global leader in the digital fashion industry, CLO Virtual Fashion operates 14 offices across 12 countries, including Asia, North America, Europe, and South America, continually expanding our reach with a diverse clientele worldwide.We are on the lookout for ambitious CLOver* to join our team, individuals who can analyze global user requirements and innovate new features while advancing state-of-the-art garment simulation technology!*CLOver refers to our global team members at CLO Virtual Fashion :)We especially welcome applications from candidates with degrees in computer graphics or vision and a solid foundation in C/C++ programming.

Join Toss Careers as a Software Engineer and be part of a dynamic team dedicated to innovation and excellence in technology. We are looking for talented individuals who are passionate about coding and eager to tackle exciting challenges in the tech landscape. This is an excellent opportunity to contribute to transformative projects that make a real impact.