Senior/Expert Backend Developer (Node.js)

A freelance Senior Backend Developer role working on diverse IoT projects, leveraging backend and cloud technologies, with potential for long-term engagement.

Location: Remote

Salary: PLN 180,000–PLN 360,000

Responsibilities

• Own and evolve the backend architecture for IoT projects: from data ingestion pipelines to API design to infrastructure decisions
• Make technical trade-off decisions and defend them clearly to the team and to clients
• Design and maintain cloud infrastructure on AWS (EKS, Aurora, DynamoDB, Timestream, S3) with production-grade reliability
• Lead technical discussions: RFCs, architecture reviews, post-mortems
• Mentor other backend engineers, raise the bar on code quality, and set patterns others can follow
• Collaborate closely with firmware engineers, mobile developers, QA, PMs, and clients
• Use AI tools as part of your daily workflow, not as a party trick
• Challenge product and technical assumptions when something doesn’t make sense, even if it means a harder conversation

Requirements

• 7+ years of backend development experience, with a meaningful chunk spent leading technical direction, not just writing code
• Deep, hands-on AWS expertise: EKS, Aurora, DynamoDB, Timestream, S3
• Strong Node.js skills in production systems at scale
• Kubernetes (EKS), Docker, and Terraform: you’ve built and maintained real infrastructure, not just followed tutorials
• Solid understanding of distributed systems, event-driven architectures, and data pipelines
• Experience with MQTT or similar IoT messaging protocols
• CI/CD pipelines you’ve designed yourself (Jenkins, GitLab CI, GitHub Actions)
• English at B2+ minimum, written and spoken
• The ability to translate business needs into technical decisions and explain those decisions to non-technical stakeholders
• Strong opinions, loosely held: you propose direction, you defend it, and you change your mind when the evidence says you should.

Benefits

• 100% remote work & flexible working hours with core hours between 10:00 and 18:00 CET, with some client meetings scheduled up to 20:00 CET (approx. 2 per week)
• Knowledge-sharing initiatives
• If we’re a great fit after a few months of collaboration, we’d love to invite you to join the internal intent team for a long-term partnership, including: paid holidays & sick leave, training budget & career growth support.