Freelance Backend Engineer (Kotlin) – UK Market

About the role

We are looking for a Freelance Senior Backend Engineer to join our UK Market squad. You will ensure smooth data flow between voize products and partner software, building and maintaining integrations with senior care and hospital platforms. The role is open to candidates based in England, France or Germany.

Key responsibilities

• Design and develop interfaces that connect voize with care and medical systems.
• Create scalable, future‑proof APIs and set industry standards.
• Take end‑to‑end ownership from concept through implementation and ongoing maintenance.
• Architect thoughtful data models and sustainable solutions for complex integrations.
• Collaborate closely with partners, clients and internal teams to deliver impact‑driven features.

Required profile

• Several years of experience in backend development and API integration.
• Excellent proficiency with Kotlin.
• Strong knowledge of REST API design and development.
• Business‑level fluency in English (C1) for effective communication.
• Based in England, France or Germany and willing to travel to the UK and Berlin.
• Availability for a minimum of 3 months.

Required skills

• Kotlin
• REST
• API design and development

What we offer

• Freelance contract with flexible remote work.
• Travel expenses covered for required trips.
• Opportunity to make a tangible impact on caregivers’ daily workflow.