Open to opportunities

Nathan Lee

@nathanlee2

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Senior full-stack engineer specializing in secure, high-performance AI and Web3 web applications.

Italy

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What I'm looking for

I’m looking to lead end-to-end engineering on secure, high-performance web systems—especially real-time AI experiences and Web3 integrations—where I can optimize performance, reduce infrastructure costs, and build reliable developer tooling.

I’m a Senior Full Stack Engineer with 10+ years designing, building, and scaling production-grade web applications across AI platforms, blockchain systems, and consumer-facing products. I lead end-to-end initiatives—from architecture and performance optimization to real-time systems and developer tooling—always with a focus on security, reliability, and measurable impact.

Most recently at Fireworks AI, I reduced infrastructure costs by 20% while increasing overall system throughput, and established security best practices across authentication/authorization, secure API design, secrets management, and data access controls. I also built real-time AI output streaming with WebSockets and SSE, created an internal analytics and monitoring platform that cut debugging and incident resolution time by 50%+, and pioneered a hybrid rendering strategy (ISR+SSR) delivering sub-second load times under heavy concurrent usage. Previously, I built blockchain-integrated backend services and features at Ledger, including wallet functionality used by a large global userbase, plus internal blockchain monitoring tools for node health, transaction delays, and on-chain anomalies.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Engineer

Current

Fireworks AI

Sep 2022 - Present (3 years 7 months)

Led performance profiling, optimization, and refactoring that reduced infrastructure costs by 20% while increasing overall system throughput. Implemented real-time AI output streaming with WebSockets/SSE, improved system reliability, and accelerated AI query page loads with a hybrid ISR+SSR rendering strategy.

WebSockets Server Sent Events (SSE)AWS Lambda Microservices Secrets Management Performance Profiling

Full Stack Engineer

Ledger

Jun 2019 - Oct 2022 (3 years 4 months)

Developed backend services and APIs integrating with blockchain networks, improving performance, reliability, and transaction-handling efficiency. Built secure transaction and account workflows, delivered internal blockchain monitoring tools, and launched core wallet functionality including transaction validation, asset management, and portfolio views.

Backend Services Account Management Wallet

Frontend Engineer

Cubitts

Sep 2016 - Apr 2019 (2 years 7 months)

Led frontend development of a virtual try-on experience using WebGL and face-mapping, improving engagement and contributing to increased online sales. Built a 3D eyewear configurator and delivered a headless CMS-driven content platform, with Cypress end-to-end testing to ensure cross-browser stability.

WebGL 3D Visualization Headless CMS Frontend Development

Frontend Engineer

Alitalia

Oct 2014 - Aug 2016 (1 year 10 months)

Developed and maintained high-traffic, customer-facing web applications for a national airline with a focus on performance, accessibility, and cross-browser compatibility. Partnered with UX designers, backend engineers, and product stakeholders to deliver reliable frontends within regulated, enterprise environments.

Frontend Development Performance Optimization Accessibility Browser compatibility Web Application Engineer