Lead Product Engineer | System Architect

I build, scale, and ship real-time mobile products and high-performance backend systems. I specialize in bridging the gap between complex infrastructure (WebSockets, PostgreSQL optimization, ILP modeling) and seamless user experiences.

As the sole technical owner, I architected and shipped Common Ground end-to-end.

Engineering Highlights:

• Real-Time Infrastructure: Architected a Redis-backed dual-channel WebSocket system (user + room levels) with heartbeat monitoring, validated under load test at 1,000 concurrent connections with zero downtime.
• Database Optimization: Reduced messaging query latency from 700ms to 38ms (94.6% reduction) via compound B-tree indexes and analyzed production query patterns using EXPLAIN ANALYZE.
• Concurrency & Monetization: Implemented zero-leakage subscription pipelines using RevenueCat webhooks, secured by PostgreSQL row-level locking (select_for_update) and atomic transactions.
• Cost Engineering: Reduced Google Places API spend by 80% via field masking, session token batching, and multi-layer response caching without degrading search latency.

• Mobile: React Native, Expo SDK, Optimistic UI, Adaptive Layouts, i18n-js (16-language support).
• Backend: Python, Django, Django REST Framework, Django Channels, WebSockets, OAuth2, JWT.
• Database & Cache: PostgreSQL (compound indexing, atomic operations), Redis, Boto3.
• DevOps & Cloud: EAS Build (M1 parallel pipelines), Sentry (distributed tracing), Backblaze B2, AWS S3.
• Optimization: Linear & Mixed-Integer Programming (LP/IP/MIP), Constraint-based modeling.

• PostHog: Contributor to the open-source product analytics suite.
• Supabase: Contributor to the open-source Firebase alternative.

• Fixing a 700ms PostgreSQL Query: From Seq Scan to 38ms: A deep dive into debugging a production bottleneck in Common Ground, detailing how I used EXPLAIN ANALYZE and compound indexing to achieve a 94.6% latency reduction.

• Operations Optimization Engine (Acıbadem Healthcare): Designed an ILP-based patient flow optimization model using real operational data to dynamically adjust bed allocations and minimize room assignment errors.
• UCD Plast B2B Platform: Delivered a full end-to-end website (ucdplast.com) as a solo contractor in under 4 weeks, transitioning all formal business operations for the client.

📫 Connect: LinkedIn | 🌐 Product: duofine.com