zeely - Backend Lead (Node.js)
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Requirements
• 7+ years of commercial experience with Node.js • Active AWS Architect or Developer certification • Experience building high-load systems and optimizing cost/latency trade-offs • Payment systems integration experience • Backend development experience for mobile applications (iOS/Android) and web products • Experience hiring engineers and building processes in fast-scaling organizations • AI expertise we value: • Commercial experience integrating AI APIs (OpenAI, Anthropic, Google, and others) • Understanding of multi-model orchestration, including routing, fallback strategies, and cost/latency trade-offs • Experience with AI-assisted development and code review tools (Claude Code, GitHub Copilot, etc.) • Understanding of RAG, embeddings, MCP, and AI agents (hands-on experience is a strong plus)
Responsibilities
• Lead the Backend Department, driving team growth, planning, estimations, code reviews, mentoring, and engineers' performance management • Define the architectural vision and ensure the reliability, scalability, and performance of the backend platform • Develop and evolve our AI orchestration layer across multiple models and providers, optimizing generation quality, latency, and cost efficiency • Own the evolution of the AI Gateway — the core platform component powering text, image, voice, avatar, and video generation • Scale infrastructure and backend services to support product growth and increasing workloads • Maintain high engineering standards in code quality, security, observability, and operational excellence • Deliver strategic AI initiatives, including our proprietary RAG pipeline, MCP integrations, and AI agent capabilities • Collaborate closely with Frontend, Mobile, QA, AI Engineering, and DevOps teams to achieve business goals • Partner with the Principal Engineer on infrastructure capacity planning and cost optimization • 3+ years of hands-on experience with NestJS • Proven experience designing and evolving microservice architectures in production environments • Deep expertise in PostgreSQL and Redis • Experience working with ORMs such as Prisma and Drizzle • Hands-on experience with AWS services, including EKS, RDS, SQS, S3, CloudWatch, and OpenSearch • Strong Docker expertise • Experience designing reliable, scalable, and observable distributed systems • Solid understanding of on-call processes and incident management practices • Upper-Intermediate English level or higher
Benefits
• Work with cutting-edge technologies and contribute to building AI-powered tools • Join a strong A-level team that motivates you to grow and achieve more • Remote-first approach: work from anywhere, with the option to visit our offices in Warsaw and Kyiv • Paid day offs and sick leaves — we care about your work-life balance • Regular performance reviews to ensure your growth is transparent and rewarded • Financial support — consultations for private entrepreneurs from our dedicated finance team • Recruitment process: • Intro Call → Test Task → Technical Interview → Final Interview → Reference Check → Offer • Send us your CV — we'd love to get to know you!
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