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Subsets

Senior Software Engineer (Full-stack)

Subsets • Copenhagen, Capital Region of Denmark, Denmark
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Subsets (YC S23) is an early-stage startup building the future of AI-driven subscription growth. As a Senior Data Engineer, you’ll join the early team to build the scalable infrastructure that powers CRM and lifecycle insights for millions of subscribers.

What you will do

  • build product features end-to-end, from backend APIs to frontend interfaces.

  • own and develop new features from conception to deployment, ensuring reliability and scalability across our platform.

  • keep the codebase maintainable through solid architecture, refactoring, and testing.

  • work closely with design and product people to deliver smooth, intuitive user experiences.

  • instrument features and gather the right metrics to help the team make informed decisions.

  • work in a lean, high-performing team where you will have a significant impact on the product and assume numerous responsibilities.

Tech Stack

  • backend: .NET 10, Entity Framework Core, PostgreSQL, Hangfire, Redis.

  • frontend: React.js, Vite, Tailwind CSS, shadcn/ui.

  • infrastructure & CI/CD: Google Cloud Platform (GCP), Terraform, GitHub Actions.

You may be a good fit if

  • (required) React/Vite experience. Realistically, any modern frontend framework is fine (React, Vue, Svelte, etc.).

  • (required) you have some experience with .NET and Entity Framework Core.

  • you have experience with DDD (Domain-Driven Design) and event-driven data architecture.

  • you have PostgreSQL (or general SQL) expertise and familiarity with Google Cloud Platform.

  • you have a strong bias toward action and the ability to work autonomously in fast-paced, loosely defined environments.

  • you have an "anti-meeting" culture mindset and value focused work time.

  • location: This is a Copenhagen-based onsite role — we believe the best ideas happen together, in person.

Perks

  • competitive salary & equity

  • company card for all things office food/snacks

  • great breakfast and lunch (and dinner when working late in the office)

  • relocation support if you don't live in Copenhagen

  • office kayaks 🛶

Apply Now