Aramis Sennyey

Built and maintained the Expo-based driver app UI with React Native, including location tracking, push notifications, and offline queueing so deliveries execute reliably across varying network conditions. Designed the order routing service in Node.js/Express, coordinating PostgreSQL transactions for merchant payouts and using Redis caching for real-time status updates. Owned PostgreSQL data storage and schema design, optimizing complex queries for search indexing while ensuring integrity through transactional constraints and safe migrations. Set up practical engineering processes (code review checklists across accessibility, performance, and security) and established TDD-based testing for the logistics backend. Improved high-volume order lookup performance with composite indexes and enhanced peak-time reliability using connection pooling patterns with Redis.

Developed a React Native and Expo frontend for streaming recommendations and built Node.js services with Express and PostgreSQL to manage content metadata. Collaborated with data scientists to implement A/B testing capabilities in the client app. Wrote Jest test suites for critical streaming-path functions, achieving high coverage and reducing regressions during weekly deployments. Integrated third-party analytics APIs, storing user interaction events in Redis for real-time dashboard visualization. Maintained CI/CD pipelines for the web player and mobile apps and addressed production issues, including resolving memory leaks in an audio playback module via heap profiling and event listener cleanup.

Built a React Native and Expo mobile client covering authentication, content feed rendering, media playback controls, and push notification handling. Automated regression testing for cart functionality using UI tests to catch broken links and layout issues earlier in sprints. Created RESTful services in Node.js/Express to synchronize inventory between local databases and central cloud storage. Migrated legacy cookie-based session management to Redis-backed sessions, and contributed to checkout-team code reviews by improving error handling patterns and recommending database transaction isolation improvements.