Senior Tech Lead - C# / .NET

Lokation: København

One of our clients in Copenhagen is looking for a Senior Tech Lead to play a pivotal role within an established platform, overseeing the modernization initiative that includes the development of a new mobile application and API. This role demands a blend of technical expertise and leadership capabilities, focusing on stabilizing the codebase while ensuring robust technical decisions are made to drive the project's success. We are moving quickly with this recruitment process and encourage candidates to apply as soon as possible. Main Responsibilities In this hands-on lead position, you will: Lead the technical direction of the modernization initiative from concept through delivery Conduct a structured technical assessment of the existing codebase and recommend a path forward. Establish development standards and engineering guidelines for team consistency. Identify architectural gaps and define a clear development roadmap Assess team capabilities and implement necessary delivery practices Define API contracts ensuring consistency and secure integration Uphold coding standards through code reviews and quality improvements Provide clear guidance to developers translating architectural principles into actionable decisions Act as a trusted partner, aligning technical execution with business goals. Key requirements Approx. 10 years of professional software development experience Proven experience as a Tech Lead responsible for architecture and development standards Strong expertise in C# and .NET, including both .NET Framework and modern .NET Experience with PostgreSQL and relational databases, including raw SQL (performance, readability, debugging, troubleshooting) Solid experience with CI/CD pipelines and version control (Git/GitHub), including setting up quality gates Understanding of testing strategies, including unit and integration tests Experience in establishing architecture standards and engineering practices across a team - now just following them Experience designing and implementing API contracts effectively, including required vs. optional fields and error handling standards Experience using architecture validation tooling (e.g. NetArchTest or similar) Strong understanding of software design principles (e.g. SOLID) applied pragmatically in existing codebases Comfortable leveraging AI-assisted development tools for design, testing, code reviews, and refactoring Experience working in agile development environments (Scrum, Kanban or similar) Proficient in Jira and Confluence as part of day-to-day collaboration and delivery processes Fluent in Danish and English, able to communicate technical concepts clearly Strong communication skills with the ability to explain technical concepts and trade-offs to both technical and non-technical stakeholders. Nice-to-have Frontend experience with JavaScript/TypeScript and modern frameworks. Personal characteristics Takes ownership and works independently while being a proactive and collaborative team player Pragmatic and solution-oriented, with a string focus on delivering value and quality Strong performance and proactivity mindset, with the ability to create momentum and move initiatives forward Confident making difficult technical decisions and taking responsibility for trade-offs – including recommending a rebuild when necessary Thrives in complex environments and enjoys untangling ambiguity into clear direction Strong communicator with the ability to translate technical complexity into clear and actionable insights for both developers, stakeholders and leadership Structured and quality-focused, with a natural ability to create momentum, drive execution and maintain high engineering standards. Start date: ASAP Duration: Until end of year Location: Copenhagen Workload: 100%

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