Keven Chhen

Product-driven software engineer who loves solving complex problems, with over 7 years of professional experience focused on building scalable and efficient applications from scratch.

Specialized in JavaScript, TypeScript, React, Node.js, and AWS. Skilled in working collaboratively with cross-functional teams on cutting-edge technology projects, deeply committed to crafting innovative web solutions that drive business productivity.

Senior Full Stack Engineer

Thoughtworks

San Francisco, CA

Jun 2020 - Jul 2023

Played a crucial role in developing and maintaining highly scalable and efficient applications, including an online educational platform, contributing to its remarkable growth and achieving a peak revenue of $100 million.

• Enhanced the one-on-one learning experience while taking ownership of real-time communication system, user management, and notification services.
• Refactored a complex legacy JavaScript codebase to TypeScript, resulting in significant improvements in code maintainability and a 30% reduction in type-related errors.
• Minimized round trips by leveraging GraphQL and utilizing declarative data fetching queries to efficiently retrieve relevant data, enabling seamless integration with multiple third-party services.
• Architected an event-driven microservices environment on AWS, utilizing Lambda, EC2, S3, SQS, SNS, DynamoDB, API Gateway, and Cognito to improve scalability, reliability, and cost-efficiency.
• Deployed a comprehensive CI/CD pipeline for 5+ repositories, leveraging Jenkins and Docker to automate testing and deployment workflows, driving significant gains in accuracy and operational effectiveness.
• Boosted platform performance with load balancing, image optimization, and query caching, resulting in a 70% improvement in speed and responsiveness metrics.
• Mentored junior team members through code reviews, pair coding, and one-on-one conversations, resulting in improved work quality, optimized pull-requests, and consistently high standards.

TypeScript, React, Vue.js, Node.js, Express.js, PostgreSQL, Cassandra, Redis, GraphQL, AWS, Jenkins, Docker

Full Stack Engineer

TheoremOne

Woodland, CA

Aug 2016 - Apr 2020

Collaborated with senior-level engineers on multiple projects, employing agile methodologies to deliver technical solutions that supported the achievement of startup clients' goals.

• Created a custom apparel e-commerce single-page application from the ground up utilizing the MERN stack.
• Developed the interactive and responsive 3D graphics design feature using Three.js, resulting in an 80% increase in user engagement and a highly positive user experience.
• Implemented and maintained backend endpoints using technologies such as Node.js and Express, facilitating seamless integration with the database and enabling efficient CRUD operations.
• Built a reusable Storybook UI library for a booking engine for hospitality management SaaS, enhancing collaboration and accelerating feature development by 70%.
• Boosted customer satisfaction by 50% by creating interactive data visualization charts and event timelines with D3.js, including a highly functional admin dashboard.
• Enabled a remarkable load time reduction from 8s to 0.35s by implementing server-side rendering, lazy loading, and component optimization.
• Achieved a 35% reduction in response time and improved system performance by optimizing SQL queries with indexing and restructuring the database schema.
• Ensured reliability and robustness of applications with comprehensive testing using frameworks like Jest and Cypress, achieving over 90% of test coverage.

JavaScript, React, Redux.js, Next.js, Node.js, MySQL, MongoDB, REST API, Tailwind CSS, Material UI, JSON, JWT, Passport, Axios, WebSocket, Socket.io, Postman, Jest, Cypress, Github

The Hong Kong University of Science and Technology

Bachelor of Science - Computer Science

Sep 2012 - Jun 2016