Stefan Iacob

Designed and shipped full-stack features in a TypeScript monorepo, processing over 50M data events per month at peak load. Architected ETL pipelines for large-scale advertising data, reducing average pipeline latency by 35% via query optimization and parallel processing. Built real-time delivery and caching layers using MongoDB and Redis, improving cache hit rates by 40% and lowering downstream response times. Implemented BullMQ-based queue processing to eliminate bottlenecks across critical workflows. Designed and optimized ClickHouse analytical queries for sub-second dashboard/reporting endpoints. Increased monorepo test coverage from 58% to 87% using unit, integration, snapshot, screenshot, and end-to-end testing. Led MR reviews, mentored engineers, maintained CI/CD quality gates, and reduced broken builds by 60% quarter-over-quarter.

Built TypeScript/Node.js services and React frontends within large-scale monorepo projects for RESTful APIs used by 200,000+ monthly active users. Designed PostgreSQL schemas and analytical reporting queries, cutting report generation time by 45% through index tuning and query restructuring. Implemented Redis-backed caching and session management, reducing database read load by 30% and improving API response times across production services. Contributed to CI configuration and automated testing infrastructure, introducing integration and end-to-end tests to reduce post-deployment regressions by 50%. Participated in MR reviews and technical design discussions with globally distributed teams and delivered platform releases end-to-end, including monitoring and iteration after launch.

Developed and maintained JavaScript/Node.js web application features for an e-commerce SaaS platform serving 1,000+ active merchants, improving reliability by 25% over four years. Built dynamic React and server-rendered components, improving page load performance by 30% with code-splitting and lazy-loading. Managed SQL schema and queries for product catalog and order management, enabling 10x data growth without query slowdowns. Implemented automated unit and integration tests to reduce production bug escapes by 40% and promoted test-driven development. Contributed to CI workflows and deployment scripts for faster releases across core modules, supported REST API versioning for 15+ external partners, and delivered optimized SQL-backed reporting/export features that reduced manual support requests by 35%.