Backend Software Engineer - Local Business Experience

Welcome to the journey of joining the Daangn team!At Daangn, we strive to create an environment where individuals can grow alongside the company's development.Our recruitment team is here to assist you in making the moment of collaborating with amazing colleagues a joyful reality. Introducing the Advertising TeamThe Advertising Team is responsible for the core advertising services that drive Daangn's revenue model. We operate an advertising platform targeting Daangn's 19 million monthly active users (MAU), providing effective advertising opportunities for both small businesses and large enterprises through localized advertising solutions. Our ongoing improvements can significantly impact advertisers' performance and Daangn's revenue, as we continuously evolve our services through data-driven decision-making and constant experimentation. The Advertising Team plays a pivotal role in balancing user experience with advertising effectiveness, ensuring we deliver useful and relevant ads while preserving Daangn's core values of community communication and transaction experiences. We develop various advertising formats and targeting options, leveraging machine learning technology to optimize advertising performance. Additionally, the team participates in crucial decision-making processes from an organizational perspective. Since ads are displayed across multiple app surfaces, we must consider not only ad performance but also the overall health of the service and user satisfaction. Therefore, we adopt a comprehensive approach that considers the needs of advertisers, user experience, and our business objectives. Within the Advertising Team, you'll engage in diverse tasks such as developing new advertising products, enhancing the advertising platform, analyzing and optimizing ad performance, and managing advertiser relationships. If you want to make an impact in a rapidly evolving advertising market grounded in innovative ideas and analytical thinking, the Advertising Team is the perfect choice for you. Learn more about the Daangn Advertising Team!Your ResponsibilitiesGrow into an expert handling large-scale advertising traffic.Daangn Market is a massive platform with 19 million MAU. Operating an advertising system reliably in this large-scale environment presents both challenges and opportunities. By joining the Advertising Team, you will work with systems that handle hundreds of millions of ad requests daily. You will learn how to respond to various issues that arise, enhancing your skills in building high-availability systems and practical problem-solving. Specifically, in the Serving Team, you will work with a Real-Time Bidding (RTB) system that demands millisecond-level response times, allowing you to acquire skills in designing and implementing ultra-low latency distributed systems. In the DSP Team, you will develop performance optimization and scalable architecture for processing large volumes of advertising data.Gain experience in data-driven decision-making and optimization.As a developer in the Advertising Team, you will handle vast amounts of user and ad performance data. You will have the opportunity to build and optimize pipelines for efficiently collecting, processing, and analyzing this data, enhancing your skills in big data processing technologies, data warehousing, and real-time data streaming. Additionally, you will gain hands-on experience applying machine learning models to real advertising systems, utilizing AI/ML technologies in areas such as user targeting, ad performance prediction, and real-time bid price determination to continuously improve the advertising system.Experience solving technical challenges in a continuously growing service.Daangn is in a constant state of growth. As such, the advertising system is continually expanding, with new features being added. You will experience evolving the system to accommodate various changes such as new ad product launches, expanded targeting options, and improved ad effectiveness measurement. For example, in the DSP Team, you'll be developing logic for new ad formats, integrating new data sources, and in the Serving Team, implementing new ad display methods, tackling various challenges that arise. Through this process, you’ll be able to learn about and apply the latest technological trends, significantly enhancing your technical capabilities.Design and operate microservices architecture directly.The Advertising Team adopts a microservices architecture, allowing you to design and implement independent microservices across different domains such as DSP, DMP, and recommendation systems. This experience will enable you to apply core concepts of microservices architecture, including inter-service communication, API design, and distributed transaction handling.

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.

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.

Welcome to Your Journey with daangn!At daangn, we strive to cultivate an environment where individuals can grow alongside the company as we evolve.The daangn recruitment team is here to assist you in reaching moments of meaningful collaboration with wonderful colleagues. Introducing the Identity Service TeamThe Identity Service team is responsible for managing membership and authentication at daangn. We develop a range of features related to authentication and user management to ensure that all customers can use our services safely and smoothly. We aspire to create a world where every local service is connected through daangn, aligning our growth with scalable and secure membership services. We continuously explore ways to provide a better user experience while safeguarding personal information and ensuring customer safety.How the Identity Service Team OperatesHealthy Conflicts for Better OutcomesWe embrace constructive disagreement for improved results. By respecting each other and engaging in open discussions, we make better decisions.Prioritizing Purpose Over MeansWhat we aim to achieve is of utmost importance. We select the appropriate means aligned with our goals and remain vigilant to ensure that means do not overshadow our purpose.Thinking Beyond the Team for Company-Wide ImpactWe consistently consider ways to create greater value across the organization, moving beyond simple problem-solving.Vision for Present and Future GrowthWe focus on sustainable choices that remain viable even after significant growth, not just immediate solutions. Technologies Used by the Identity Service TeamGo, gRPC, gRPC-GatewayMySQL, Redis, KafkaKubernetes, Istio Daangn Tech Meetups#1 Separating daangn's Membership System into Microservices#2 Life After Separation into MSA: Growth of Go Server#3 Replacing the Lock Mechanism of a Running Car: Centralization of Authentication Systems Daangn Tech Blog Link to Blog

Welcome to Daangn's Team Journey!At Daangn, we strive to create an environment where individuals can grow alongside the company's expansion.The Daangn recruitment team is here to assist you in reaching a moment where you can engage in thoughtful discussions with fantastic colleagues. Introducing the Location Intelligence TeamThe Location Intelligence Team plays a crucial role in managing and analyzing various location and spatial data, which enriches our services as we transition into a local super app. We handle complex, large-scale spatial data securely and efficiently, pursuing a sustainable and scalable platform. We are looking for someone to help tackle the diverse technical challenges that arise as we continuously develop services that grow and expand globally. Check out our Tech Meetup Presentation Videos: How far does our neighborhood narrow down? Exploring our neighborhood through natural boundaries Serving complex spatial data quickly and efficientlyYour ResponsibilitiesDesign, develop, and maintain Daangn's neighborhood certification and area management systems, ensuring stable platform services that other internal microservices rely on.Enhance connections among Daangn users and explore ways to create new connections.Establish policies and build shared frameworks to ensure Daangn operates reasonably as a location-based service.Create a large-scale data system for securely and efficiently storing and utilizing various location information.Who We Want to Work WithIndividuals who enjoy defining problems in unstructured situations and learning from leading the resolution process.Developers who consider writing tests, code reviews, and documentation as core processes and actively practice them.Those who understand and can utilize relational database modeling, indexing, and transaction processing.Individuals who comprehend asynchronous programming and can derive solutions for concurrency and consistency issues.People with a fundamental understanding of REST API or RPC communication structures and practical experience.Team players who actively communicate to improve services based on logical reasoning and mutual respect.Bonus Points for Candidates Who HaveExperience developing with Golang.Experience with services based on microservices architecture.Knowledge of or experience with large-scale spatial information and user location data pipelines.Knowledge of Geographic Information Systems or related project experience.Additional InformationFor full-time hires, there is a 3-month probation period.Individuals with disabilities or veterans are given preference in the hiring process in accordance with the laws related to employment promotion and vocational rehabilitation.Please submit your portfolio or resume in PDF format, indicating your actual contributions per project.Live coding tests and backend development-related questions will be part of the video interview.There will be a system design test in the job interview.How to Join Us1. Document screening → 2. Video interview (live coding test) → 3. Job interview (system design) → 4. Culture fit interview and reference check → 5. Negotiation of terms → 6. Final offer...

Welcome to the Journey of Joining the Daangn Team!At Daangn, we strive to create an environment where individuals can grow alongside the company as it evolves.Our recruitment team is here to help you reach that moment of engaging in meaningful discussions with wonderful colleagues. Introducing MyKarrot Task ForceThe MyKarrot Task Force is dedicated to transforming the 'My Karrot' tab into a pivotal space for enhancing user engagement across the Daangn platform. Users tend to navigate to the 'My Karrot' tab after taking actions, and our team believes it can evolve from a simple user page into a personalized hub that facilitates their subsequent actions.Daangn is focused on creating diverse experiences centered around hyper-local services, including secondhand trading, part-time jobs, real estate, and community interactions. While each service has its unique growth phase and strategy, they are all interconnected within the context of users' neighborhood lives. Our team is committed to bridging these services with user activities, presenting the right actions and information at the perfect moments.Long-term, we envision 'My Karrot' as a space where relationships and transactions build, making it easier for users to initiate their next activities. The primary goal of the MyKarrot Task Force is to create a more organic connection among various services within Daangn, enabling users to seamlessly continue their actions.ResponsibilitiesDesign and develop the server for the Server Driven UI (SDUI) that comprises the 'My Karrot' tab.Create an environment for experimenting with the 'My Karrot' tab UI based on user behavior patterns.Develop systems that connect various services' contexts with user activities to enhance the 'My Karrot' experience.Decompose existing legacy services related to 'My Karrot' and gradually transition traffic.We are looking for candidates who have:3+ years of backend development experience or equivalent engineering capabilities.Experience in designing and operating services based on Kotlin, Spring Boot, and RDBMS.A user-centric mindset for product development.Self-motivation, excellent communication skills, and the ability to execute tasks promptly.Additional Preferred QualificationsExperience in identifying problems and implementing improvements by analyzing user behavior data and metrics.Experience in leveraging AI/LLM to enhance development productivity or attempt novel problem-solving methods.Additional InformationFull-time positions include a 3-month probation period.We prioritize candidates with disabilities and veterans in accordance with the 'Act on the Promotion of Employment for the Disabled' and 'Act on the Honorable Treatment and Support of Veterans'.Application Process1. Document screening → 2. Video interview → 3. Job interview → 4. Culture fit interview and reference check → 5. Compensation negotiation → 6. Final acceptance and onboardingGo to the Daangn joining journey guide()

Role overview Toss Careers is seeking a Data Engineer in Seoul to strengthen its advertising initiatives. The position centers on creating data solutions that guide advertising choices and enhance campaign results. Close collaboration with colleagues from different teams is a key part of the role. What you will do Build and maintain data pipelines and systems tailored for advertising analytics Use modern tools to process and analyze large volumes of data Work with team members to turn business requirements into technical solutions Transform raw data into practical insights that shape advertising strategy Location This role is located in Seoul.

Coupang is revolutionizing the shopping experience, aiming to amaze each customer from the moment they launch the Coupang app until their order is delivered to their doorstep. With a robust end-to-end e-commerce and logistics network, coupled with a passionate commitment to customer-centricity, Coupang has eliminated the trade-offs between speed, selection, and price. We proudly offer incredibly fast shipping on millions of products, including fresh groceries, delivered within hours across the nation, 365 days a year. This is our promise to millions of customers in Korea, a nation that boasts one of the largest and fastest-growing e-commerce landscapes in the world. [About the Team]As a vital part of the Ecommerce Engineering team, our mission is to deliver exceptional customer experiences, achieve world-class service excellence, and drive hyper-growth in revenue. We accomplish this by developing scalable and extensible architecture to support rapid business expansion, creating high-performance and resilient backend systems to manage increasing customer demands, and implementing stable, fault-tolerant mechanisms that ensure an unmatched customer experience. Our vision is to craft disruptive products and resilient platforms for customers, leveraging world-class talent and cutting-edge technology.

Join our dynamic team at Coupang where we are driven by a passion for tackling complex real-world challenges and creating innovative solutions that enhance the lives of millions. As a Backend Engineer, you will collaborate with talented developers, fostering a culture of knowledge sharing and rapid innovation. Engage in building cutting-edge in-house technologies, revolutionizing mobile architecture, and pushing the boundaries of machine learning and deep learning. Together, we will create a world where our customers wonder, 'How did we ever live without Coupang?'

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.

About Tridge:Tridge has been addressing the information asymmetry and inefficiencies in global agricultural trade through data and technology. Our next chapter involves expanding the Vertical Intelligence we've accumulated over the past decade into a global supply chain network.We create exclusive industry intelligence (Vertical AI) based on vast domain data,Automate interactions within the buyer-seller network (Horizontal AI), andBuild a 'global supply chain OS' that enables transactions to scale on their own.Despite facing challenging environments and practical constraints, we have continued to push forward, resulting in stronger execution and clearer direction. We have gained a sharper understanding of what matters most and how to execute effectively.The problems Tridge seeks to address remain significant, which is why we are looking for great colleagues. To sustainably solve market asymmetries and imbalances that humanity has long struggled with, we need teammates who can think deeply and execute diligently.

Coupang Pay, a subsidiary of Coupang Corporation, offers a tailored electronic payment gateway service (PG) to meet the growing needs of Coupang customers. Our focus is on providing innovative payment and financial service solutions to everyone using Coupang's platforms, from customers purchasing items on coupang.com and Coupang Eats to sellers utilizing Coupang's open market and Coupang Eats merchants. With extensive experience in the fintech sector, our team is dedicated to transforming every aspect of the payment experience for our customers. Are you interested in learning more about Coupang Pay? Join us on this exciting journey!Key ResponsibilitiesCoupang Pay aims to make Coupang the most convenient online payment site. As a Development Manager in the Product Engineering team, responsible for various services offered by Coupang Pay, you will participate in developing exceptional fintech services and ensure higher quality payment services through code reviews. You will also play a crucial role in delivering and enhancing the country’s first one-touch payment system, 'Coupay.' Collaborating with the accounting, finance, and fintech development teams, you will be actively involved in developing and operating the fintech back-office to provide customers with a faster and more convenient payment experience.

Join Our Team!The Machine Learning Backend Engineer will be part of the ML Service Team, developing backend servers and common service platforms for various AI products within Toss Bank.The ML Service Team consists of Data Scientists, responsible for model development and application, and ML Engineers, who focus on server development, collaboratively creating innovative AI solutions.We work closely with product organizations responsible for banking services, leveraging AI technology to develop products. Collaboration with POs, designers, and developers ensures we manage the complete development cycle of AI products.Your Responsibilities:Design and develop robust server architecture to ensure a stable delivery of diverse AI products handled by the ML Service Team.Create individual services capable of handling large-scale traffic based on a solid server architecture.Develop servers that can efficiently serve heavy computational AI models with reliable response times and throughput.Operate services that allow distributed tracing in a microservices architecture while minimizing disruptions.We Are Looking For:Experience in server development and operation using one or more programming languages such as Python, Kotlin, or Go.Ability to design resilient service architectures and implement stable code structures.Experience deploying and monitoring servers in Kubernetes environments for stable operations is a plus.Experience and skills in developing and operating production services that handle high traffic or have stringent SLAs are desirable.A background in solving large and complex problems through software technology or creating business impact through services or products is advantageous.No prior ML experience is required, but a strong interest in AI/ML and a desire to gain experience in this area is welcomed.Resume Recommendations:Provide concrete examples of practical server development experience in your resume.Include details about technical considerations and your actual implementations while solving problems.If you have experience comparing costs and benefits among choices when balancing architectural complexity and development resources, please include that.Detail any projects that have made a business impact.Discuss experiences where you applied developed products in production and refined them based on performance metrics.Your Journey to Joining Toss Bank:Application submission > Live coding test > Job interview...

Company OverviewCoupang exists to deliver extraordinary customer satisfaction. When customers say, "How did I live without Coupang?" we know we have fulfilled our mission. With a singular commitment to making shopping, dining, and everyday life easier for customers, Coupang is driving innovation across the multi-billion-dollar e-commerce industry. As one of the fastest-growing e-commerce companies, Coupang has established a unique position in the domestic commerce landscape and built customer trust.Coupang prides itself on being a globally listed company rooted in a startup culture. This agility, dating back to our founding, fuels our ability to continuously launch new services and expand our business. Every employee at Coupang is given the opportunity to embody an entrepreneurial spirit, driving new innovations and initiatives. The boldness to dive into work without hesitation and achieve results is at the heart of how we operate. At Coupang, you will witness the daily growth of yourself, your colleagues, your team, and the entire company.All Coupang employees are genuinely committed to our mission of shaping the future of commerce. We tackle customer problems head-on, challenge traditional beliefs, and push the boundaries of what is possible. If you seek an incredible working experience in a high-tech, always-on, hyper-connected world, join Coupang now.

Who We AreJoin us in setting global standards for video understanding AI! Twelve Labs is at the forefront of developing advanced AI models tailored for video analysis, search, summarization, and insights derived from vast video datasets.Our models are utilized by the largest sports leagues to swiftly and accurately highlight key moments in extensive game footage, providing a hyper-personalized viewing experience. In South Korea, integrated control centers use our technology to efficiently navigate CCTV footage in crisis situations, while major broadcasters and studios worldwide leverage our models for content creation aimed at 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 successfully raised over $111 million from prestigious venture capital firms and corporations, including NVIDIA, NEA, Index Ventures, Databricks, and Snowflake. Our unique AI model developed in Korea is exclusively available via Amazon Bedrock. We are committed to creating innovative products with outstanding colleagues and growing alongside our global clientele.Twelve Labs operates based on the following core values:A commitment to honesty and reflection about ourselves and our teamResilience and humility, embracing failure and feedbackA dedication to continuous learning and enhancing the team's capabilitiesIf you enjoy solving challenging problems and growing through the process, the opportunity is here at Twelve Labs.About the TeamThe Console team is responsible for creating a B2B SaaS platform that connects our proprietary AI models with customers. Currently, we offer our technology through API, SDK, and the web application called Playground, catering to a diverse range of clients from individual developers to large enterprises. Moving forward, we will establish a common foundation that provides a consistent data layer across all products, enabling them to operate seamlessly on our platform. Our team, based in San Francisco and Seoul, collaborates as one unit, leveraging diverse backgrounds to create remarkable products.Our team values autonomy and open-mindedness. Every member is encouraged to set and pursue their goals, fostering a culture of free discussion and suggestions for product improvement. Engineering collaborates closely with product managers from the design phase to ensure high-quality system architecture, with peer reviews enhancing the integrity of our code.About the RoleAs part of the Console team, the Staff Backend Engineer plays a crucial role in developing the backend systems that underpin our products, enabling users from individual developers to large enterprises to effectively utilize our video AI models through APIs, SDKs, and a Web Console. This position involves designing core systems for authentication, billing, organizational management, and a unified data layer that supports all products. Beyond merely implementing features, this role includes setting the technical direction for the team and spearheading solutions to complex challenges.You will work closely with product managers, frontend engineers, ML engineers, and various teams to design and implement systems that are both user-friendly and scalable.You may be a good fit if you haveOver 8 years of experience in backend engineeringExperience in a startup or fast-paced environment, with a proven ability to lead technical decisions and manage projects under uncertaintyDeep understanding of backend languages such as Go and Java/Kotlin, with experience designing and operating production-level systemsProficiency in system architecture design and scalability considerations

Join Coupang as a Senior Manager in Backend Engineering!We are seeking an experienced leader to manage and enhance our payment systems. You will play a crucial role in developing and optimizing payment solutions that serve millions of customers.Key Responsibilities:Lead backend engineering teams to build robust payment infrastructures.Collaborate with cross-functional teams to streamline payment processes.Ensure high availability and scalability of payment systems.Qualifications:Proven experience in backend engineering, preferably in payment systems.Strong leadership and team management skills.Proficiency in programming languages such as Java, Python, or Node.js.Excellent problem-solving and analytical skills.How to Apply: Please complete the attached Internal Transfer Request Form and submit it using your Coupang email account.

Coupang, a leading e-commerce company based in Seoul, South Korea, delivers services across shopping, dining, and lifestyle. The company is recognized for its focus on customer experience and its commitment to innovation. Employees are encouraged to take initiative and contribute to both their own growth and the company’s mission of solving customer challenges. The Advertising Division at Coupang creates solutions that help brands and marketers reach goals such as revenue growth, market share, customer acquisition, and brand awareness. Teams within this division include Sales, Marketing, Video Product, Operations, Product, and Engineering. Collaboration, customer-centric thinking, and diverse perspectives shape the way these teams work together. The LCS Account Management team partners directly with advertisers to understand their business objectives and key performance indicators. By creating tailored media plans and collaborating with internal groups, the team supports advertiser growth using Coupang’s advertising products. Role overview This Account Manager position focuses on supporting mid- to large-scale advertisers within Coupang’s Advertising Division in Seoul. What you will do Analyze large datasets to help advertisers assess the effectiveness of their investments and guide their decision-making.

Join our dynamic team at Toss Careers as a Data Analyst specializing in advertising. In this role, you will leverage your analytical skills to drive data-driven decisions and optimize advertising strategies. Collaborate with cross-functional teams to uncover insights, enhance campaign performance, and contribute to the growth of our advertising initiatives. Your expertise in data analysis will directly impact our success and innovation in the advertising space.

Overview Coupang is dedicated to astonishing our customers. We thrive when we hear feedback like, “How did we ever live without Coupang?” Our relentless pursuit of making shopping, dining, and living easier than ever is driving us to disrupt the multi-billion-dollar e-commerce industry from the ground up. As one of the fastest-growing e-commerce companies, we have established a formidable reputation as a dominant and trustworthy force in South Korean commerce. We take pride in combining the agility of a startup with the resources of a major global public company. This unique blend empowers us to maintain our rapid growth trajectory and launch innovative services swiftly. Our entrepreneurial spirit fosters an environment rich with opportunities to spearhead new initiatives and innovations. At Coupang, you will witness continuous growth—both personally and professionally—alongside your colleagues, your team, and the company. Our mission to shape the future of commerce is tangible. We challenge the limits of what is possible, tackling problems and overcoming traditional trade-offs. Join Coupang today and help us create extraordinary experiences in this ever-connected, high-tech world. Role Summary The Global Operations Technology (GOT) division is integral to ensuring Coupang can deliver products to customers within hours of placing their orders. GOT is committed to revolutionizing logistics through the development of an efficient delivery network at unprecedented scale and speed. As a Senior Staff Backend Engineer within GOT, you will harness advanced algorithms to enhance the customer experience by guaranteeing timely deliveries, even during peak shopping seasons. We seek a tech-savvy professional who can shape the technological direction across multiple teams, leveraging deep industry expertise and utilizing statistical and machine learning techniques to provide significant value to our customers. The ideal candidate will be pragmatic, resourceful, and ready to tackle challenges that may appear insurmountable, with a proven history of executing impactful projects. Key Responsibilities Lead the architectural design of Fulfillment Technologies aimed at scalability, future extensibility, and reliability. Develop and align with stakeholders on an appropriate roadmap and future technology direction for the Fulfillment Technologies team. Identify and mitigate technical challenges and organizational blockers. Break down complex problems into straightforward, actionable components.