Darren Leonard
@darrenleonard
Senior full‑stack engineer specializing in scalable, high‑performance web systems and rapid prototyping.
What I'm looking for
I am a senior full‑stack engineer with over 10 years of experience designing and building scalable, high‑performance systems. I specialize in React (web and native), TypeScript, and backend architectures using Node.js, PostgreSQL and GraphQL, and I focus on rapid prototyping, performance optimization, and robust, maintainable infrastructure.
My work has spanned SaaS, crypto trading platforms, and enterprise products where I led migrations to TypeScript, optimized database queries for large scale traffic, implemented CI/CD and security improvements, and built real‑time data pipelines. I enjoy solving complex challenges with well‑architected, user‑friendly solutions and improving developer productivity and system reliability.
Experience
Work history, roles, and key accomplishments
Staff Fullstack Engineer
Trustware
Jan 2023 - Present (2 years 9 months)
Designed and optimized backend architecture with Node.js, PostgreSQL, Prisma and GraphQL to ensure scalability and reliability; implemented security layers and CI/CD improvements with Docker and GitHub workflows, improving system performance and reducing latency.
Rebuilt company websites and developed risk management and monitoring systems for auto trading; optimized PostgreSQL queries and built real-time WebSocket pipelines to support millions of concurrent connections.
Led migration from JavaScript to TypeScript and created a React CLI tool that increased development speed ~40%; integrated GraphQL/REST APIs into high-traffic platforms to improve maintainability and performance.
Senior Frontend Engineer
Beauty Pie
Feb 2012 - Dec 2017 (5 years 10 months)
Built browser-based face detection and skin analysis features and a product recommendation system; developed innovative web interactions including a JavaScript game using eye-blink controls to enhance user engagement.
Learned industry coding standards, design patterns, debugging and performance considerations while contributing to engineering tasks and supporting software development practices.
Education
Degrees, certifications, and relevant coursework
University of Chester
Bachelor's degree, Computer Science
2006 - 2010
Grade: 3.98
Completed a Bachelor's degree program focusing on foundational computer science and software engineering principles from April 2006 to August 2010.
Tech stack
Software and tools used professionally
Availability
Location
Authorized to work in
Website
forecastr.coPortfolio
app.forecastr.coJob categories
Skills
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