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Timothy Lomuscio

@timothylomuscio

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Full Stack Engineer specializing in TypeScript/React and AI/LLM integrations for scalable production systems.

United States

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What I'm looking for

I’m looking to build end-to-end products where scalable backends and fast, accessible UIs meet AI/LLM capabilities—shipping to production with strong observability, security, and reliability, and mentoring teams to senior-level ownership.

I’m a Full Stack Engineer with 13+ years of end-to-end experience building production-grade web applications, REST and GraphQL APIs, microservices architectures, and cloud-native backend systems. I pride myself on shipping full stack features from design to production while optimizing frontend performance and scaling distributed systems.

At Meta, I architected and owned platform services in TypeScript/Node.js and React that process over 2 billion events per day. I improved reliability to 99.98% uptime SLA, reduced per-request API latency by 35%, and built a GraphQL federation and gRPC integration layer that cut breaking-change incidents by 60%.

I also drove large-scale AI/LLM integration, building RAG-powered documentation search with LangChain and pgvector, and delivering zero-downtime feature flag and experimentation systems serving 50M+ users. I strengthened observability with OpenTelemetry and Datadog, reducing MTTD by 45% and MTTR by 38%, and executed a zero-downtime migration of a 200GB PostgreSQL cluster.

Earlier, at Thirty Madison, I built HIPAA-compliant telehealth products scaling from 50,000 to 500,000+ active patients with zero HIPAA audit findings across multiple reviews, and I reduced p95 API latency by 40%. I bring the same practical, engineering-driven mindset to mentoring engineers and delivering dependable, secure systems—whether it’s healthcare compliance, developer tooling, or client-facing platforms.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Engineer

Current

Senior Full Stack Engineer

Thirty Madison

Apr 2019 - May 2023 (4 years 1 month)

Built and scaled a HIPAA-compliant telehealth platform from 50,000 to 500,000+ active patients, sustaining 10x growth with zero service degradation across three brands. Improved frontend accessibility to 95+ Lighthouse scores, reduced p95 API latency by 40% (820ms to 490ms), and increased 90-day patient retention by 22%.

React TypeScript PostgreSQL

Full Stack Engineer

Dell Technologies

Mar 2016 - Mar 2019 (3 years)

Architected distributed full stack backend services and React internal tools supporting supply chain, logistics, and product catalog operations for 10M+ enterprise customers, reducing data pipeline failures by 20% and improving SLA adherence. Built self-service tools for 500+ engineers, reducing support tickets by 15%, and standardized CI/CD to cut release cycle time from 3 weeks to 5 days.

TypeScript React REST APIs GraphQL CI CD Docker

Full Stack Developer

Arbisoft

Aug 2013 - Feb 2016 (2 years 6 months)

Delivered 8+ full stack production web and mobile applications across EdTech, healthcare, and travel, maintaining a 100% client contract renewal rate across multi-year engagements. Built Python/Django and React-based REST backends and improved data retrieval speed by 20–35% using PostgreSQL query optimization and Redis caching.

Python Django React JavaScript REST API Development PostgreSQL Redis Docker