Fullstack Engineer

3 days ago

Copenhagen, Copenhagen, Denmark Stealth Startup Full time 420,000 - 700,000 per year

We're a mission-driven technology startup empowering nonprofit organizations to unlock their full potential. Our platform helps mission-based teams raise more funds and spend less time on operations, allowing them to focus on creating real-world impact.

We've secured strong pre-seed funding from an accomplished Scandinavian entrepreneur and investor who continues to provide strategic guidance and additional capital as we reach key milestones.

Founded by a former McKinsey consultant and investment banker, we're building a company for high-achieving individuals who want ownership, steep learning curves, and rapid career progression. This is an opportunity to shape both the product and the organization from the ground up.

About The Role
Join as a
Founding Engineer
and play a defining role in building a platform that helps nonprofits raise more funds and expand their impact.

You'll help define and grow the engineering culture, fostering learning, ownership, and purpose. You'll take full responsibility in an early-stage environment, shaping both the product and the technical foundation. This is a rare opportunity to help build a high-impact platform from 0 to 1.

You'll design and deliver end-to-end product experiences using modern technologies, including scalable backends, RAG pipelines, and intuitive frontends that make complex workflows simple.

You'll collaborate directly with the founding team and customers to translate real user needs into elegant, data-driven solutions integrating AI and LLM capabilities that deliver tangible value.

What We're Looking For

  • Proven ability to build scalable web applications end-to-end, balancing speed and maintainability
  • Frontend: Strong proficiency in React, , and TypeScript for responsive, performant UIs
  • Backend: Experience with serverless architectures (e.g., Firebase, Supabase, or similar) for APIs, authentication, and real-time data
  • Languages: Proficient in TypeScript (frontend/fullstack) and Python (backend, data, AI integration)
  • Data pipelines & scraping: Experience with Scrapy, Playwright, or similar tools; familiarity with AI-assisted scraping is a plus
  • RAG & LLMs: Practical experience implementing retrieval-augmented generation or other LLM-based workflows using frameworks such as LangChain or DSPy; fine-tuning is a plus
  • Machine Learning: Solid understanding of ML fundamentals and experience integrating ML/LLM outputs into production systems
  • Cloud experience: Deployment experience with Google Cloud, AWS, or Azure, plus familiarity with Docker and CI/CD pipelines
  • Testing & optimization: Strong testing discipline and familiarity with tools for optimizing model and prompt performance (e.g., DSPy)
  • Security: Knowledge of best practices across authentication, data storage, and API design
  • Experience: 2–5+ years of professional software development experience in either frontend, backend or fullstack
  • Education: MSc in Computer Science, Software Engineering, or equivalent experience

What We Offer

  • Competitive salary and equity: Copenhagen-based candidates can expect a target salary of 420,000–700,000 DKK per year, plus equity (depending on qualifications, experience, and ambition)
  • Meaningful impact: Work with inspiring nonprofit organizations and help them amplify their positive social outcomes
  • Early-stage growth & learning: Join a fast-growing startup with a steep learning curve and strong potential for rapid advancement
  • Ambitious, mission-driven culture: Contribute to a purpose-led team where your work truly matters

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