Senior Backend Engineer, NodeJS

This is a fully remote position, open to applicants in Poland.

📋 Description

• Design and develop the backend architecture for AI-driven automation systems.

• Collaborate with AI engineers and product teams to integrate and expand LLM-based product features.

• Implement and enhance agent-based systems, including ReAct and supervisor-agent models.

• Optimize RAG pipelines and enrich context utilizing both structured and unstructured data.

• Create robust APIs for internal services and external integrations.

• Ensure observability, monitoring, and alerting using tools like Grafana and OpenSearch.

• Engage in code reviews and participate in architecture discussions.

• Maintain comprehensive technical documentation for newly developed systems and APIs.

• Collaborate with AI engineers, product teams, and cross-functional stakeholders.

• Build production-grade systems that automate clinical and operational workflows.

⛳️ Requirements

• Over 8 years of commercial backend development experience with Node.js in product companies, ideally in SaaS.

• Profound understanding of complex backend systems from end to end.

• Extensive experience in designing backend architectures and technical solutions.

• Knowledgeable in system decomposition, scalability trade-offs, long-term maintainability, and technology selection.

• Proven experience in developing scalable, high-performance backend systems and robust APIs.

• Strong grasp of data flows, failure modes, and performance bottlenecks.

• Hands-on experience with integrating LLMs into production systems.

• Familiarity with designing and implementing multi-agent AI workflows in a production setting.

• Practical experience with modern AI frameworks.

• Experience in designing and optimizing RAG pipelines.

• Strong prompt engineering capabilities, including structured outputs, schema validation, and iterative evaluation.

• Understanding of LLM infrastructure in production settings.

• Hands-on experience with PostgreSQL and AWS, including CDK, Lambda, API Gateway, and ElastiCache.

• Good understanding of observability and debugging practices.

• Strong engineering culture emphasizing testing, CI/CD, reliability, and technical ownership.

• Product-oriented mindset.

• Proactive enthusiasm for AI.

• Fluent in Russian.

• English proficiency at B2 level or above.

• Experience in medical/healthcare AI or regulated environments is a plus.

• Familiarity with MCP in Node.js is an additional advantage.

🏝️ Benefits

• Clear opportunities for growth and a competitive compensation package.

• Fully remote long-term collaboration under a B2B model.

• Health insurance provided after the probation period.

• Compensation for sports and wellness activities.

• Personalized English lessons through Preply.

• Defined growth paths.

• 19 paid vacation days per year.

• 4 additional wellness days each year.

• Paid sick leave for the first 5 working days.

• Thoughtful gifts for significant life events.

• Offline corporate events.