Dennis Lee

Led multi-tenant SaaS with Next.js 14, TypeScript, tRPC, Prisma/PostgreSQL, Redis caching; deployed AI features via OpenAI & Claude; built RAG pipelines on pgvector/Pinecone with LangChain/LlamaIndex; implemented streaming LLMs via SSE/WebSockets; architected scalable Node.js/Express APIs with Trigger.dev & AWS; managed AWS infra, Docker, CI/CD, and observability for improved performance and cost.

- Developed full-stack e-commerce and SaaS applications using React, Next.js, Node.js, Express, and PostgreSQL, with Redux and Redux-Saga managing complex client-side state and side-effects. - Improved application performance by 40% through PostgreSQL query and index optimization, Redis caching layers, frontend bundle splitting, and image/asset optimization. - Collaborated cross-functionally with product, design, and QA, contributing to code reviews and automated test coverage on tight release cycles.

- Built modern, type-safe web applications with React, Next.js, TypeScript, and Tailwind CSS, focused on maintainability, accessibility (WCAG), and component reusability. - Designed hybrid database architectures using PostgreSQL and MongoDB to balance relational integrity with flexible document workloads. - Containerized services with Docker, configured NGINX reverse proxies on VPS environments, and deployed across multiple cloud platforms.

- Developed responsive web applications using React, JavaScript (ES6+), HTML5, and modern CSS frameworks. - Built REST APIs in Node.js and Express, integrating payment gateways, transactional email services, and third-party SaaS APIs. - Implemented user authentication, session management, and PostgreSQL data modeling for client applications. - Partnered with design teams to translate Figma/Sketch mockups into pixel-perfect, accessible, performant user interfaces.