Senior Ai-first .NET Engineer

We are looking for a Senior AI-first Engineer who combines deep technical expertise with a genuine, hands-on approach to AI-assisted development. You will work across varied client engagements — from modernizing legacy systems to architecting new products — and are expected to contribute at a high level regardless of project context. The ideal candidate has built a real, personalized AI development workflow — including custom skills, reusable prompt templates, and project-level instructions — and continues to refine it. Out-of-the-box tool usage is not sufficient for this role. We follow a remote-first setup with no mandatory regular office visits for this position. From time to time, you may be invited to join in-person meetings in one of our offices (Warsaw, Lodz, Wroclaw, Gdansk, or Bialystok), for example for client visits or team reunions.

• Hands-on experience with Claude Code, GitHub Copilot, Cursor, or equivalent AI coding assistants
• Ability to create custom skills and sub-agents and orchestrate multiple AI agents in parallel for concurrent task execution
• Strong prompt engineering skills; able to produce reliable, high-quality output and critically evaluate AI-generated results
• Production-grade .NET / C# (REST APIs, middleware, dependency injection) with solid understanding of OAuth 2.0, OpenID Connect, and JWT
• Deep proficiency in JavaScript and TypeScript
• 2+ years of hands-on production experience with React
• Strong grasp of state management, asynchronous patterns, and frontend testing
• Confident designing systems across monoliths, microservices, and distributed architectures
• Working knowledge of DDD, CQRS, Event Sourcing, and event-driven systems, including message brokers (Kafka, RabbitMQ, Azure Service Bus, or similar)
• Hands-on use of Docker and working knowledge of Kubernetes, along with CI/CD pipelines (GitHub Actions, Azure DevOps, or similar)
• Experience with cloud platforms (Azure, AWS, or GCP) and observability practices (structured logging, distributed tracing, alerting)
• Solid background with SQL databases and ORMs; familiarity with NoSQL is a plus
• Additional exposure to Python, Java, or Node.js is highly desirable
• Clear communication skills in English (B2+), both written and spoken; comfortable in client-facing environments

• Design, develop, and maintain full-stack features with high standards of quality, performance, and reliability
• Apply AI tools throughout the workflow: generation, refactoring, review, testing, and research
• Contribute to architectural decisions — technology selection, system design, and trade-off analysis
• Conduct thorough code reviews and uphold engineering best practices across the team
• Identify risks, bottlenecks, and security concerns proactively and propose solutions
• Work directly with clients in English — requirements clarification, technical discussions, progress updates
• Mentor junior and mid-level engineers through day-to-day guidance and knowledge sharing
• Stay current with AI tooling developments and contribute findings to the broader team