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Lasse Tange

Senior Full-Stack Developer & Tech Lead

📍Based in Copenhagen, Denmark

I have spent 15 years building web and mobile applications, most of that time inside international startups and public institutions in Berlin and Copenhagen.

About me

I am a full-stack developer who plans, architects and builds web and mobile applications end to end, primarily in TypeScript/Node.js. I am equally at home on the frontend and the backend, working with a wide range of technologies and languages.

Beyond development, I am also experienced in setting up, scaling and operating web applications: cloud infrastructure, Infrastructure as Code (IaC), CI/CD pipelines and testing.

I have also worked with AI since OpenAI released GPT-3, and I have built and launched several AI products of my own. In that work I use a range of AI technologies: RAG, embeddings and vector search, prompt design and agentic workflows.

I take on selected freelance and consulting engagements, and I am also open to startup ideas. Get in touch if you are interested.

How I work

Besides being easy to talk to and get along with, my approach is:

  • Analytical: I dig into the problem and the options before committing to a concrete solution.
  • Result-oriented: I value trust over control and micromanagement, and a process that is measured by what it delivers.
  • Quality-driven: I combine fast, pragmatic problem-solving with software built to last.