Freelance Senior Backend Engineer - Kotlin (m/f/d) arbeitnow Voize Berlin · 9/26/2026

Primetime; Berlin; Hybrid; EUR 83.000 - 124.000; Vollzeit

Zusammenfassung

voize is seeking a Freelance Senior Backend Engineer for our German Market squad. You will ensure data flows smoothly between voize products and partners’ software, building and maintaining integrations with care and hospital systems.

We welcome remote work across Germany, France or the UK. You will shape integration architecture, design scalable APIs, and own the end-to-end development of complex solutions that save caregivers time and improve documentation.

Qualifikationen

• Several years of experience in backend development and API integration.
• Excellent proficiency with Kotlin.
• API design and development with REST.
• Fluent in German (C1) to communicate effectively with partners.
• Willingness and work authorisation to travel to Berlin (we cover your expenses!).
• Can work with us for minimum 3+ months.

Aufgaben

• Shape the integrations between voize and care/hospital software.
• Build scalable APIs and data interfaces connecting products and partners.
• Take end-to-end ownership from concept to ongoing development of integrations.
• Design thoughtful data models and sustainable solutions for complex systems.
• Deliver impactful work that saves caregivers’ time and improves documentation.

Kenntnisse

Backend development

API integration

Kotlin

REST API

German (C1)

Travel to Berlin

Freelance

3+ months

Jobbeschreibung

Why voize? Because we’re more than just a job!

At voize, we believe the greatest gift to frontline workers is time - time to care, connect, and be present. Today, that time is lost to admin work that pulls nurses away from what matters most: people.

Your Mission

As a Freelance Senior Backend Engineer for our German Market squad, you’ll ensure that data flows smoothly between our products and our partners' software solutions. You'll build and maintain the integrations that connect the voize with senior care and hospital software platforms. We are open for you to be based remotely across Germany, France or the UK.

Your Daily Business – No two days are alike

Shape the future of our integrations – Develop interfaces that seamlessly connect voize with systems in the care and medical sector

Build future-proof solutions – Develop a scalable API, set industry standards, and work closely with partners and clients

Take end-to-end ownership – From the idea and implementation to the ongoing development of our integrations

Architecture with foresight – Design thoughtful data models and sustainable solutions for complex systems

Work with impact – Your work saves caregivers time, improves documentation, and supports people who do amazing work every day.

Your Skillset – What you bring to the table

Several years of experience in backend development and API integration

Excellent proficiency with Kotlin

API design and development with REST

Fluent in German (C1) to communicate effectively with partners

Willingness and work authorisation to travel to Berlin (we cover your expenses!)

Can work with us for minimum 3+ months

Ready to talk?

We look forward to your application and can’t wait to meet you – no matter who you are or what background you have!

This overview was written from the original listing to help you understand the role. Always confirm the specifics on the employer’s application page.