Ai-first .NET Engineer

We are looking for an AI-First Fullstack Engineer who is actively building a real AI-augmented development practice — not just using autocomplete. You will work across varied client engagements, contribute to meaningful technical decisions, and be expected to grow quickly in an environment that takes AI tooling seriously. This is a role for engineers who are intentional about how they use AI and want to develop that skill alongside their core technical craft. 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. Responsibilities • Develop and maintain full-stack features with attention to quality, performance, and reliability • Apply AI tools actively throughout your workflow: generation, refactoring, review, testing, and research • Participate in architectural and design discussions — contribute ideas, ask good questions, and learn from senior engineers • Write clean, reviewable code and actively engage in code reviews • Communicate clearly with the team and client stakeholders in English • Flag risks, blockers, and technical concerns early • Continuously refine your AI workflow and share learnings with the team AI-First Requirements Must have: • Hands-on experience with Claude Code, GitHub Copilot, Cursor, or equivalent AI coding assistants • Understanding of agents and sub-agents: what they are, how they are composed, and when to use them • Experience with custom skills: creating or using reusable AI skill definitions that extend tool capabilities beyond defaults • Familiarity with AI planning workflows: using AI to generate structured implementation plans (e.g. task breakdowns, step-by-step plans stored as files or tickets) before generating code • Prompt engineering sufficient to produce reliable, high-quality output; ability to critically evaluate and override AI suggestions when needed • Experience building or configuring project-level AI instructions (e.g. copilot-instructions.md, CLAUDE.md, or similar) to shape agent behavior at the repo level Nice to have: • Awareness of how AI tools fit into different SDLC phases: requirements analysis, design, implementation, code review, testing, and documentation — not just code generation • Practical experience orchestrating multiple AI agents in parallel for concurrent task execution • Familiarity with agentic loop patterns: tool use, reflection, iterative self-correction Technical Requirements • 3+ years of commercial experience with .NET / C# — REST APIs, middleware, dependency injection, authentication flows: OAuth 2.0, OpenID Connect, JWT • SQL databases and ORMs; NoSQL familiarity is a plus • Additional experience in Python, Java, or Node.js is a plus • Solid proficiency in JavaScript and TypeScript • Practical experience with React (preferable) and/or Angular • Familiarity with state management, async patterns, and frontend testing basics • Comfortable working on both monolithic and service-oriented codebases • Awareness of DDD, CQRS concepts (hands-on experience is a plus, not required) • Basic familiarity with message-driven or event-driven patterns • Docker fundamentals; basic Kubernetes awareness is a plus • CI/CD: GitHub Actions, Azure DevOps, or similar • Cloud exposure: Azure, AWS, or GCP • Basic observability: structured logging, understanding of tracing concepts Salary ranges B2B 110 - 136 PLN/hour EC 14500 - 17800 PLN/month