Freelance Backend Engineer (Kotlin) – German Market

About the role

We are looking for a Freelance Senior Backend Engineer to join our German Market squad. You will be responsible for ensuring smooth data exchange between voize’s products and partner software used in senior care and hospitals.

Key responsibilities

• Design and develop integrations that connect voize with care and medical systems.
• Build and maintain a scalable, future‑proof REST API.
• Take end‑to‑end ownership from concept through implementation and ongoing support.
• Design robust data models and sustainable architectures for complex integrations.
• Collaborate closely with partners, clients, and internal teams to set industry standards.

Required profile

• Several years of professional backend development experience.
• Proven expertise in API integration and design.
• Excellent proficiency in Kotlin.
• Fluent German (C1) for effective communication with partners.
• Willingness and authorization to travel to Berlin (expenses covered).
• Availability for a minimum of 3 months.

Required skills

• Kotlin
• REST API design and development
• Backend development
• API integration

What we offer

• Fully remote work across Germany.
• Travel expenses covered for Berlin visits.
• Freelance contract with flexible hours.
• Opportunity to make a tangible impact on caregivers’ daily workflow.