Freelance Senior Backend Engineer — Kotlin & API Integrations

Voize; Greater London; Hybrid; GBP 71,000 - 130,000; Part time

Job summary

Voize is seeking a Freelance Senior Backend Engineer for our French Market squad to ensure data flows smoothly between our products and partners. You’ll build and maintain integrations with care and hospital software platforms and own end-to-end delivery.

You’ll design scalable APIs, set integration standards, and collaborate with clients and partners. Based in France, England or Germany, you should be able to travel to Paris (expenses covered).

Qualifications

• Several years of backend development and API integration.
• Excellent proficiency with Kotlin.
• API design and development with REST.
• Business fluent in French (C1).
• Based in France, England or Germany.
• Willingness to travel to Paris (expenses covered).
• Available to work for at least 3+ months.

Responsibilities

• Shape the future of integrations connecting voize with care and medical systems.
• Develop a scalable API and establish integration standards.
• Own end-to-end delivery from idea to ongoing development.
• Design thoughtful data models for complex ecosystems.
• Collaborate with partners and clients to maximise impact.

Skills

backend development

API integration

Kotlin

REST API design

French (C1)

Job description

Voize is seeking a Freelance Senior Backend Engineer for our French Market squad to ensure data flows smoothly between our products and partners. You’ll build and maintain integrations with care and hospital software platforms and own end-to-end delivery.

You’ll design scalable APIs, set integration standards, and collaborate with clients and partners. Based in France, England or Germany, you should be able to travel to Paris (expenses covered).