Full Stack Developer

About haseln haseln helps B2B companies across the DACH region start conversations with the right decision-makers. We combine outbound sales with our own technology and work with startups as well as established mid-sized companies. We’re a small team, growing fast.

The role

You’ll build web applications our team and clients use every day. You own features across the whole stack, from database to interface.

What you’ll do

• Build and ship web apps end-to-end: frontend, backend and database.
• Create clean, fast interfaces for internal tools and client-facing products.
• Design APIs and integrate third-party services.
• Work directly with sales and operations to turn their needs into features.
• Keep our codebase simple, tested and easy to extend.

You’re a fit if

• You have solid experience with TypeScript, React and Node.js (or similar).
• You’re comfortable with SQL databases such as PostgreSQL.
• You care about good UX, even for internal tools.
• You use AI tools in your daily work and ship fast.
• You speak good English. German is a plus.

You’re probably not a fit if

• you only want to work on one side of the stack.
• you need detailed specs before you get started.