Freelance Senior Backend Engineer - Kotlin (m/f/d) in Berlin

This role is about building and maintaining the connections between a voice documentation product and the software used by care homes and hospitals. A strong candidate has several years of backend work behind them, deep Kotlin skill, and solid REST API design, and can own an integration from first idea through to ongoing upkeep. Fluent German matters because the work involves talking directly with partners and clients.

How it fits the AI era

The product itself rests on turning spoken words into structured records, so the backend carries data between speech tools and outside care systems. AI speeds up parts of that pipeline, but the integration work still needs a person who can design clean data models and judge what partner systems actually require. Reliability and clear partner communication stay human.

How it builds AI experience

Working here means gaining hands on exposure to how speech driven documentation moves into real care and hospital software. That builds skill in designing APIs that carry sensitive, structured health data between AI outputs and partner platforms. A candidate can strengthen this by showing past integration work and interest in health data flows.

Worth showing

• Partner system integrations
• German at C1 level
• End to end ownership

This is our own read, written from the employer's posting and the company's Spotlight. The employer's posting is the source of truth for the role.

A voice app that turns what a nurse says out loud during care into structured documentation, so less of a shift is spent typing it up afterward.

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