IPECS - Backend Developer

## About this opportunity IPECS enables innovative and continuous R&D experience using the latest technologies, and experiences domestic and international communication solutions through various products and solutions. I hope you will pay a lot of attention to talented people who have the challenge, passion, and creativity to grow from IPECS to a global leader. We are now looking for a backend software developer to designing and developing Web service, AI & API. Your role will include all development activities such as: requirement analysis, system, architecture, software design, integration and product documentation. Our team mainly works on developing a UC (User Communication) system called iPECS-ONE and provides call, chat and collaboration service. We need back-end engineer with LLM, GenAI, and RAG development experience for AI Agent development. ## What will you do * Design and implement scalable core backend components based on a microservices architecture * Kubernetes-based service operations and API Gateway/MSA design (including Helm, ArgoCD, and GitOps practices) * Developing AI/LLM backend integration and scalable system design (including MCP or similar interfaces) * Building ELT pipelines and observability systems (logging & monitoring) * AI data pipeline construction: Developing a RAG system and interactive data preprocessing using a vector database * Language: JavaScript, TypeScript, Node.js, Python * Node.js/Docker, open source analysis & debugging, Linux, DB (Back-end) * GenAI capabilities: Experience building RAG (Retrieval-Augmented Generation)-based chatbots that go beyond simple responses using LangChain.js and other tools * Chatbot Scenario Design: Experience planning and developing hybrid services that combine rule-based and LLM-based chatbots * High-Volume Traffic Handling: Experience optimizing database queries and distributed processing in enterprise-level, large-scale user environments * Preferred domain experience: Open API, various open source libraries and frameworks * Web platform development experience using Node.js (Express, NestJS, etc.) * Database: PostgreSQL, MySQL, Redis (Caching/Pub-Sub) * Infrastructure: Docker, Kubernetes, AWS, CI/CD Pipeline * Git configuration management experience Interview process: 1st Recruiter Screening Call – 2nd Coding Test (Java, Python) – 3rd Skill Interview – 4th Leadership Interview Why join Ericsson?At Ericsson, you´ll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what´s possible. To build solutions never seen before to some of the world’s toughest problems. You´ll be challenged, but you won’t be alone. You´ll be joining a team of diverse innovators, all driven to go beyond the status quo to craft what comes next. What happens once you apply?Click Here to find all you need to know about what our typical hiring process looks like.Encouraging a diverse and inclusive organization is core to our values at Ericsson, that's why we champion it in everything we do. We truly believe that by collaborating with people with different experiences we drive innovation, which is essential for our future growth. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team. Ericsson is proud to be an Equal Opportunity Employer. learn more. Primary country and city: Korea (the Republic of) (KR) || Seoul Req ID: 786308