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Hi, I’m Leon Lee. I’m a Senior Software Engineer with over 10 years of experience building web products, consulting on high-growth SaaS, developer platforms, and an AI startup. I enjoy turning ideas into reliable, scalable features and collaborating closely with product, design, and ML teams to ship meaningful user experiences. I thrive on shipping robust frontend and backend systems, balancing speed with maintainability, and continuously improving performance and reliability. I value pragmatic design, clear contracts between frontend and backend services, and hands-on collaboration with product managers, designers, and data/ML engineers to push smart features from experiment to production.…Hi, I’m Leon Lee. I’m a Senior Software Engineer with over 10 years of experience building web products, consulting on high-growth SaaS, developer platforms, and an AI startup. I enjoy turning ideas into reliable, scalable features and collaborating closely with product, design, and ML teams to ship meaningful user experiences. I thrive on shipping robust frontend and backend systems, balancing speed with maintainability, and continuously improving performance and reliability. I value pragmatic design, clear contracts between frontend and backend services, and hands-on collaboration with product managers, designers, and data/ML engineers to push smart features from experiment to production.

Leon Lee

Full Stack Developer, Front-End Developer, Back-End Developer, +2

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Hi, I’m Leon Lee. I’m a Senior Software Engineer with over 10 years of experience building web products, consulting on high-growth SaaS, developer platforms, and an AI startup. I enjoy turning ideas into reliable, scalable features and collaborating closely with product, design, and ML teams to ship meaningful user experiences. I thrive on shipping robust frontend and backend systems, balancing speed with maintainability, and continuously improving performance and reliability. I value pragmatic design, clear contracts between frontend and backend services, and hands-on collaboration with product managers, designers, and data/ML engineers to push smart features from experiment to production.…Hi, I’m Leon Lee. I’m a Senior Software Engineer with over 10 years of experience building web products, consulting on high-growth SaaS, developer platforms, and an AI startup. I enjoy turning ideas into reliable, scalable features and collaborating closely with product, design, and ML teams to ship meaningful user experiences. I thrive on shipping robust frontend and backend systems, balancing speed with maintainability, and continuously improving performance and reliability. I value pragmatic design, clear contracts between frontend and backend services, and hands-on collaboration with product managers, designers, and data/ML engineers to push smart features from experiment to production.

Available to hire

Hi, I’m Leon Lee. I’m a Senior Software Engineer with over 10 years of experience building web products, consulting on high-growth SaaS, developer platforms, and an AI startup. I enjoy turning ideas into reliable, scalable features and collaborating closely with product, design, and ML teams to ship meaningful user experiences.

I thrive on shipping robust frontend and backend systems, balancing speed with maintainability, and continuously improving performance and reliability. I value pragmatic design, clear contracts between frontend and backend services, and hands-on collaboration with product managers, designers, and data/ML engineers to push smart features from experiment to production.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

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Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Software Engineer at Huge

July 1, 2015 - July 20, 2017

Built client-facing web applications with AngularJS; contributed to features shipped for large enterprise clients; created AngularJS components, views and wiring to backend APIs; fixed UI bugs and improved design consistency.

Software Engineer at Datadog

July 20, 2017 - April 1, 2020

Worked on Datadog's React web UI around dashboards and metrics; built dashboard widgets, charts, and query configuration; managed UI state and API integration; improved UI performance for large accounts by optimizing rendering and data-fetching patterns.

Senior Software Engineer at Vercel

April 1, 2020 - July 1, 2022

Built backend endpoints for Next.js dashboards; wired project metadata and configuration into APIs consumed by the frontend; cleaned up edge cases causing inconsistent UI-backend state; improved performance for AI-heavy views by optimizing data-fetching patterns and reducing re-renders; contributed architectural input.

Senior Software Engineer at Hebia

July 1, 2022 - Present

Owned the React-based query composition for AI-assisted features; integrated backend Python services for document ingestion, retrieval, and analysis; defined frontend-backend contracts and APIs to power large document collections; implemented Retrieval-Augmented Generation with citations to provide verifiable AI-generated answers.

Software Engineer at Huge

July 20, 2015 - Present

Worked on client-facing web applications built with AngularJS; contributed to frontend features shipped for large enterprise clients; collaborated with design and product managers; helped ship features under tight deadlines.

Senior Software Engineer at Hebbia

July 20, 2022 - Present

Owned React-based frontend architecture for AI-powered query composition, AI answer review, and navigation between generated answers and sourced documents. Implemented backend integrations with Python services powering document ingestion, retrieval, and analysis, defining frontend-backend contracts and consuming structured APIs. Improved frontend performance for AI-heavy views, tracked down slow renders and costly re-computations, and collaborated closely with ML engineers and product to move AI features from experimentation to production.

Software Engineer at Huge Software

July 20, 2015 - Present

Built client-facing web applications with AngularJS; created components, views, and form-heavy workflows; wired frontend with backend REST endpoints and assisted in updating backend services to support frontend features.