Node.js Developer (LangChain, LangGraph, RAG)

Viseven Group is an international MarTech company specializing in interactive content and cloud solutions for global pharmaceutical companies since 2009. Our team includes 700+ highly qualified technical and non-technical experts across offices in Zhytomyr (Ukraine), Tallinn (Estonia), Poznan (Poland), New Delhi (India), and Bridgewater (USA).

We are looking for a Node.js Developer to join our product team building the eWizard web platform. The role involves working with LangChain, LangGraph, and RAG to build AI-powered features for the eWizard Content Experience Platform.

Responsibilities

• Design and implement AI agent workflows using tools, memory, and context management based on LangChain, LangGraph, LangSmith.
• Implement AI-based search and recommendation systems using Retrieval-Augmented Generation (RAG), vector databases, and various search strategies.
• Code reviews. Bug fixing and refactoring. Participation in planning and task estimation.
• Writing unit tests and end-to-end tests. Self-testing of developed changes in the target environment.
• Apply OOP and design patterns in practice. Document development process stages for ongoing support.
• Stay current with modern technologies and best practices for developing GenAI-powered applications.

Required Knowledge and Skills

• 4+ years of commercial experience in backend development.
• Confident proficiency in TypeScript and Node.js.
• Deep knowledge of MongoDB and database design.
• Hands-on experience with large language models: prompt engineering, RAG implementation, AI agent development.
• Knowledge of AI tools and frameworks: LangChain, LangGraph, LangSmith.
• Understanding of vector databases, embeddings, and semantic search.
• Strong understanding of software design principles/patterns and modern development practices.
• English — Pre-Intermediate+.

Nice to Have

• Microservices architecture experience.
• AWS experience.

Benefits: competitive compensation with regular salary reviews, professional and career growth, 18-20 working days of paid vacation, comprehensive medical insurance, English language courses, conference participation, comfortable office environment with option to work remotely.