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Senior Backend Engineer (Kotlin)

Permanent

Negotiable

Berlin

About Our Client

Our client is a fast-growing health tech scale-up, already revenue generating and trusted by a substantial and expanding customer base. They build technology that gives time back to the professionals who need it most – removing the administrative load that pulls people away from the work only they can do.

This is technology with a genuine social dividend. The product doesn’t replace people; it supports and amplifies the impact of the people using it. That combination – serious engineering standards paired with meaningful real-world outcomes – is what makes this team unusual.

They are well backed, growing quickly, and now expanding their engineering capability across the US and UK.

Your Mission

As a Backend Engineer, you’ll make sure data flows cleanly between our client’s platform and the third-party software their customers already run. You’ll build and maintain the integrations that connect the two – the layer that determines whether the product feels effortless or friction-filled in the real world.

Your Daily Business – No Two Days Are Alike

  • Shape the future of the integration layer – develop the interfaces that connect the platform with the established systems used across the sector
  • Build future-proof solutions – design and ship a scalable API, help set the standard in this space, and work directly with partners and clients
  • Take end-to-end ownership – from idea and implementation through to the ongoing evolution of each integration
  • Architect with foresight – design considered data models and durable solutions for genuinely complex systems
  • Work with impact – your work gives professionals their time back, improves the quality of the data they rely on, and supports people doing extraordinary work every day

Your Skillset – What You Bring

  • Several years of experience in backend development and API integration
  • Proficiency with Kotlin and Coroutines in a production environment- this one is essential
  • Strong API design and development experience with REST or GraphQL
  • Business fluent English (C1)

Why This Role

  • A product that is already commercially proven, not a bet on a future market
  • Real ownership of a business-critical layer, not a ticket queue
  • Direct exposure to customers and partners – you’ll see the consequences of your architectural decisions
  • A team where the engineering bar is high and the mission is one people actually believe in

Apply now

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