Senior Software Engineer (.NET / Java & AI Development)

We are looking for a Senior Software Engineer with strong expertise in .NET/C# or Java and practical experience using modern AI coding tools. This role combines hands-on software development with AI-assisted coding and Specification-Driven Development (SDD), focusing on delivering reliable enterprise applications without compromising engineering quality.

📍 Location: Remote (within Poland)
💼 Employment Type: B2B
💰 Rate: 160-180 PLN/h
🌍 Language: English (fluent)

Key Responsibilities

• Design, develop, and maintain enterprise applications using .NET/C# or Java.
• Translate business requirements into structured specifications and production-ready solutions.
• Leverage Claude Code, GitHub Copilot, Cursor, and similar AI tools throughout the development lifecycle.
• Review, validate, and improve AI-generated code to ensure quality, security, and maintainability.
• Collaborate with Product Owners and engineering teams to deliver scalable software solutions.
• Apply best practices in testing, debugging, code reviews, Git, and CI/CD.

Required Qualifications

• 5+ years of commercial software development experience.
• Strong expertise in .NET/C# (preferred) or Java.
• Hands-on experience with AI-assisted development tools, ideally Claude Code.
• Experience with Specification-Driven Development or specification-first engineering approaches.
• Strong understanding of software architecture, clean code, testing, and modern development practices.
• Ability to critically assess and improve AI-generated solutions.
• Independent, analytical, and delivery-focused mindset.

Nice to Have

• Recent experience with Claude Code in specification-driven workflows.
• Experience with GitHub Copilot, Cursor, or similar AI coding platforms.
• Cloud experience (Azure or AWS).
• Familiarity with Docker and distributed systems.
• Experience promoting AI-assisted development practices within engineering teams.