Senior Backend Engineer (Node.js) (вакансія неактивна)

Bitmedia Labs is an international product IT company that has been building ambitious innovative products for millions of users worldwide since 2014 — combining deep tech expertise with a creative mindset.

Responsibilities:

• Develop scalable marketplace platforms and backend systems from scratch with deep AI/LLM integration;
• Lead backend development using Node.js and TypeScript, implementing RESTful APIs, microservices, and background workers;
• Build and integrate RAG (Retrieval-Augmented Generation) solutions with vector databases for intelligent search and recommendations;
• Create AI agents and autonomous systems using LangChain/LangGraph frameworks;
• Write Python code when needed for AI/ML integrations, data processing pipelines, and LLM agent implementations;
• Develop frontend solutions and MVPs when required, implementing UI components and user interfaces;
• Integrate and manage databases (SQL and NoSQL), implement caching strategies, and optimize query performance;
• Mentor and guide junior and mid-level developers through code reviews, pair programming, and technical discussions.

Required Qualifications:

• 5+ years of professional Node.js development experience and 3+ years with TypeScript;
• Expert-level knowledge of JavaScript fundamentals (event loops, closures, promises, async/await) and asynchronous programming patterns;
• Deep understanding of Node.js frameworks (Express.js, NestJS, Fastify) and architectural patterns;
• Strong experience with SQL (PostgreSQL, MySQL) or NoSQL databases (MongoDB, Redis);
• Strong understanding of system design principles, design patterns, and software architecture best practices;
• Practical experience building AI agents beyond ChatGPT usage — demonstrated through pet projects or production work;
• Willingness and ability to learn and write Python code when needed for AI/ML integration;
• Working knowledge of front-end fundamentals (HTML5, CSS3, JavaScript) and ability to implement UI solutions when required;
• Strong strategic thinking with ability to align technical solutions with business objectives;
• Proven technical leadership and mentoring experience with ability to guide and develop team members;
• Knowledge of Docker containerization, CI/CD pipelines (GitHub Actions, GitLab CI), and DevOps practices.

Preferred Qualifications:

• Working knowledge of AI frameworks (LangChain, LangGraph) for building autonomous agents and RAG applications;
• Experience with vector databases (Pinecone, Weaviate, Qdrant, ChromaDB) and embeddings implementation;
• Familiarity with at least one modern front-end framework (React, Vue.js, Angular);
• Experience with cloud platforms (AWS, GCP, Azure) for application deployment and AI/ML services;
• Familiarity with observability tools (DataDog, New Relic, ELK stack) and monitoring practices.

Hiring process:

• Intro call with a Recruiter — Technical Interview with CTO — Final Interview — Сollection of recommendations — Offer.

Join Bitmedia Labs to evolve, explore, and make a real difference — together.

Our culture is built on openness, trust, and support. We value initiative, ownership, and results. We work as one team — helping each other, celebrating wins, and learning from challenges together.

We offer the freedom and space to grow:

• Professional growth and self-realization through ambitious products;
• The opportunity to bring your ideas to life, experiment, and directly influence the product’s development;
• Collaboration with talented teammates united by a shared goal.

We also care about well-being and balance:

• Flexible schedule and the option to work remotely or from our hubs in Kyiv, Warsaw, and Berlin;
• Competitive compensation, regular performance reviews, paid vacation, sick leave, and public holidays;
• Modern Apple equipment and thoughtful corporate gifts for holidays and personal milestones;
• Support for your growth: courses, workshops, and conferences.

Through our charity foundation Bit Spilka, run by volunteers from our team, we support the military, medics, and civilians across Ukraine — already delivering over $500,000 in aid. Here, your work also drives social impact, and you can also join our volunteer initiatives.

If this resonates with you, send your CV and join us.

Let’s foster the world together!