Open to opportunities

Lucas Lee

@lucaslee1

Message

Senior Ruby on Rails and Shopify full‑stack developer focused on high‑performance eCommerce solutions.

Singapore

Message

What I'm looking for

I am seeking roles where I can build high‑performance eCommerce or SaaS systems, lead end‑to‑end engineering, and deliver measurable product and performance gains in collaborative teams.

I am a Senior Ruby on Rails and Shopify developer with 8+ years building scalable web applications, custom Shopify themes, and apps that drive conversions and performance.

My background spans backend architecture, modern frontend stacks (React, Next.js, TypeScript), and high‑performance eCommerce optimizations using Liquid, Shopify APIs, and metafields.

I have delivered numerous production projects—Rails SaaS platforms, enterprise nopCommerce solutions, 40+ React/Next.js frontends, 30+ Shopify stores, and multiple real‑time casino/betting engines—improving performance, conversion, and operational efficiency.

I value pragmatic engineering, automated CI/CD, strong test coverage, and measurable business impact; I enjoy solving high‑load, realtime problems and enabling non‑technical teams with flexible CMS and storefront tools.

Experience

Work history, roles, and key accomplishments

Current

Freelance Full-Stack Engineer

Current

Freelance

Dec 2024 - Present (1 year 1 month)

Delivered 40+ React/Next.js applications and 30+ Shopify stores, improving Lighthouse performance by 28–52% and increasing Shopify conversion rates by 12–34% through theme and app development.

React Next.js TypeScript Shopify Liquid Ruby on Rails GraphQL Performance Optimization

Senior Ruby on Rails Developer

BrainCave

Dec 2022 - Nov 2024 (1 year 11 months)

Built 15+ production Ruby on Rails SaaS applications and APIs, implementing scalable Postgres/Redis architectures to improve API throughput by 45–70% and achieving 80–92% test coverage with RSpec.

Ruby on Rails PostgreSQL Redis Sidekiq RSpec Docker AWS API Design CI CD

Software Engineer

Span.io

Jan 2022 - Nov 2022 (10 months)

Delivered mission-critical mobile and web features, improved load times by ~34%, reduced crash rates by 28%, and automated CI/CD and testing to cut deployment risk by 40%.

React Native React TypeScript Jest Detox Docker GitHub Actions CI CD

Full-Stack Software Engineer

Span.io

Jan 2022 - Nov 2022 (10 months)

Delivered a production React Native installer app in 21 days and led front-end and full-stack integrations (GraphQL, WebSocket, IoT), improving app reliability and reducing release cycle time by ~40%.

React Native React TypeScript Ruby on Rails GraphQL WebSockets Docker CI CD

Fullstack Engineer

BlueSG

Apr 2021 - Dec 2021 (8 months)

Rebuilt core backend systems and developed microservices for high-volume rental operations, supporting 1M+ annual transactions and improving API response times by ~27%.

Ruby on Rails PostgreSQL Redis Kubernetes Docker Microservices REST APIs CI CD

Full-Stack Engineer

Independent Project

Delivered enterprise nopCommerce solutions and custom plugins, improving large-catalog search speeds by 30–55% and reducing manual operations by ~40% for B2B clients.