A senior backend engineer in Warsaw (on-site) who designs, builds, and owns business-critical Python services end-to-end, from system design through production rollout. Core stack: Python, distributed systems, cloud (AWS/GCP/Azure), and databases, with an AI-native workflow using tools like Codex and Claude Code.
We are looking for a Middle/Senior Backend Engineer who can design, build and own business-critical production systems. You will have real ownership from system design through deployment, working on scalable backend services and AI-native solutions.
The team values technical excellence, clear communication, autonomy and practical decision-making. Engineers use modern AI tools such as Codex and Claude Code to improve development workflows and engineering efficiency.
Backend Experience: Strong senior-level backend engineering experience in production systems.
Python: Strong Python skills and the ability to design clean, maintainable backend code.
Systems Thinking: Good distributed systems judgment: concurrency, failure handling, data consistency, async work, and service boundaries.
Cloud Infrastructure: Hands-on experience with cloud infrastructure such as AWS, GCP, or Azure.
Databases: Comfort with database schema design and performance tuning for real-time and high throughput scenarios.
Security: A security-conscious approach to engineering: you build for enterprise-grade requirements, handle sensitive data carefully, and think about the security implications of the systems and AI workflows you ship.
Ownership: Ability to go from problem statement to design to production rollout with real ownership.
Communication: Clear written and verbal communication. You can explain systems, trade-offs, and incidents without hiding behind jargon.
AI-Native: AI-native working style. You already use AI tools in your daily engineering workflow, and you're excited to improve how the team builds, not just your own output: better tooling, workflows, and engineering leverage.