Design, build, and maintain backend services using Kotlin and Spring Boot to process health data. Integrate third-party device APIs and ensure secure, efficient data flows between transactional and analytics layers.
Our Client is a fast-growing HealthTech company building the Arab world's first unified health-data platform — one Arabic-first dashboard that brings together users' sleep, nutrition, activity and heart data from 15+ smart devices, powered by an AI health assistant.
We're looking for a hands-on Back-End Developer to work part-time and fully remote on the core services that ingest, process and serve millions of health-data points. You'll own backend features end-to-end in a modern Kotlin + Spring Boot stack, working closely with the mobile team on clean, well-documented APIs.
Key Responsibilities:
Design, build and maintain backend services in Kotlin 2.x and Spring Boot 3.x
Model and optimize data across PostgreSQL 17 (transactional) and ClickHouse (analytics/OLAP)
Build and document clean, versioned REST APIs consumed by the iOS and Android apps
Integrate and normalize data from third-party wearable/device APIs
Design efficient data flows between the transactional store and the analytics layer
Ensure security, encryption and privacy standards for sensitive health data
Write tests, participate in code reviews, and keep technical documentation current
Requirements
Proven experience shipping production backend systems in Kotlin
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