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Freelance Backend Engineer – Kotlin
Location
United Kingdom
Posted
1 day ago
Salary
0
Seniority
Senior
Job Description
Freelance Backend Engineer – Kotlin
voize
• 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.
Job Requirements
- Several years of experience in backend development and API integration
- Excellent proficiency with Kotlin
- API design and development with REST
- Business fluent in English (C1) to communicate effectively with partners
- Based in England, France or Germany
- Can work with us for minimum 3+ months
Benefits
- Willingness to travel to UK and Berlin (we cover your expenses!)
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• Shape the future of our integrations – Develop interfaces that seamlessly connect voize with systems in the care and medical sector • Build future-proof solutions – Design and develop a scalable API, define industry standards, and collaborate closely with partners and clients • Take end-to-end ownership – From concept and implementation to the ongoing development and maintenance 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.
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• Design and implement advanced PostgreSQL schemas with row-level security (RLS) for multi-tenant applications. • Build and maintain async-heavy backend services using Python frameworks (e.g., FastAPI) with Pydantic validation. • Architect scalable data pipelines and orchestrate complex multi-stage data processing workflows. • Implement and enforce data isolation patterns in shared database environments. • Design and manage complex data workflows (e.g., additive data changes, diff detection, and selective re-processing). • Write and maintain OpenAPI contracts that serve as the development spec for cross-functional teams. • Collaborate with AI/LLM Leads on output validation, deterministic data integration, and system reliability. • Craft code that is performant, testable, scalable, and secure • Provide accurate status tracking, reporting, and estimation • Collaborate with fellow engineers and product leadership to understand requirements • Take ownership from technical design through successful delivery
• Build and architect the complete backend and data foundation for sophisticated, multi-tenant AI-driven platforms. • Focus on robust database schema design, multi-tenant architectures, asynchronous API services, and data pipeline orchestration. • Write the OpenAPI specs as the backend takes shape, ensuring seamless integration with frontend and AI components. • Architect data isolation patterns, design complex data processing workflows, implement pipeline stages, and build the core data infrastructure that allows the system to operate securely end-to-end.

