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I'm Thomas Lee, a Senior Software Engineer based in Watertown, MA. I design and deliver high-performing web applications and scalable APIs for enterprise environments, with deep expertise across frontend and backend technologies including Java (Spring Boot), .NET, Ruby on Rails, and modern JavaScript frameworks. I’ve led initiatives in real-time analytics platforms and AI-driven healthcare solutions, improving business insights and automated diagnostics. I’m passionate about building reliable systems, optimizing performance, and collaborating with cross-functional teams to solve complex technical challenges.…I'm Thomas Lee, a Senior Software Engineer based in Watertown, MA. I design and deliver high-performing web applications and scalable APIs for enterprise environments, with deep expertise across frontend and backend technologies including Java (Spring Boot), .NET, Ruby on Rails, and modern JavaScript frameworks. I’ve led initiatives in real-time analytics platforms and AI-driven healthcare solutions, improving business insights and automated diagnostics. I’m passionate about building reliable systems, optimizing performance, and collaborating with cross-functional teams to solve complex technical challenges.

Thomas Lee

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

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I'm Thomas Lee, a Senior Software Engineer based in Watertown, MA. I design and deliver high-performing web applications and scalable APIs for enterprise environments, with deep expertise across frontend and backend technologies including Java (Spring Boot), .NET, Ruby on Rails, and modern JavaScript frameworks. I’ve led initiatives in real-time analytics platforms and AI-driven healthcare solutions, improving business insights and automated diagnostics. I’m passionate about building reliable systems, optimizing performance, and collaborating with cross-functional teams to solve complex technical challenges.…I'm Thomas Lee, a Senior Software Engineer based in Watertown, MA. I design and deliver high-performing web applications and scalable APIs for enterprise environments, with deep expertise across frontend and backend technologies including Java (Spring Boot), .NET, Ruby on Rails, and modern JavaScript frameworks. I’ve led initiatives in real-time analytics platforms and AI-driven healthcare solutions, improving business insights and automated diagnostics. I’m passionate about building reliable systems, optimizing performance, and collaborating with cross-functional teams to solve complex technical challenges.

Available to hire

I’m Thomas Lee, a Senior Software Engineer based in Watertown, MA. I design and deliver high-performing web applications and scalable APIs for enterprise environments, with deep expertise across frontend and backend technologies including Java (Spring Boot), .NET, Ruby on Rails, and modern JavaScript frameworks.

I’ve led initiatives in real-time analytics platforms and AI-driven healthcare solutions, improving business insights and automated diagnostics. I’m passionate about building reliable systems, optimizing performance, and collaborating with cross-functional teams to solve complex technical challenges.

Skills

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Work Experience

Software Development Engineer II at Amazon

February 1, 2022 - November 17, 2025

Architected robust RESTful Web APIs for third-party and internal integrations using Java and Spring; built a real-time data analytics platform with Java/Kotlin and Apache Kafka to derive actionable insights; established observability with Zabbix, Grafana, and Prometheus; configured Kafka clusters and multi-environment AWS deployments (EC2, Lambda, API Gateway, S3, RDS, CloudFront); authored Terraform IaC for VPCs, security, load balancers, and CI/CD pipelines; developed enterprise-grade web apps with Node.js/NestJS/Ext JS; implemented API testing with Postman, JUnit, and pytest; supported data migrations (SAP HANA) and real-time data synchronization.

Software Engineer II (Senior FullStack Engineer) at Pegasystems

February 28, 2022 - February 28, 2022

Developed scalable backend services using Node.js, Express, and TypeScript; refactored legacy APIs; designed and implemented microservices and middleware; built Kafka-based data pipelines; modernized front-end with React, Angular, and NestJS; implemented authentication with Passport.js; integrated MySQL, PostgreSQL, and MongoDB; contributed to CI/CD with Jenkins; aided cloud deployments (Azure/AWS); implemented comprehensive testing with Jest, JUnit, and pytest; authored SDKs and reusable API components; led migrations from Ember.js to React.js; improved API documentation with Swagger/OpenAPI.

Software Engineer I (Fullstack Engineer) at Pegasystems

March 31, 2020 - March 31, 2020

Developed AI-driven and energy-optimization features; built Lifetouch's Phoenix app using .NET Core, Python, and AngularJS; migrated legacy Java to Kotlin; created cloud-native apps on AWS; optimized MySQL/PostgreSQL queries; contributed to MERN stack development; implemented NestJS modules with dependency injection; mentored frontend developers; supported Ember.js to React.js migration; implemented backend services with Go & Gin and Kafka-based data integration; established observability with Grafana/Prometheus.

Software Development Intern at OpenSpan

May 1, 2016 - May 1, 2016

Enhanced e-commerce platform with ASP.NET and MVC; improved data processing with SQL Server; built responsive landing pages with HTML5/CSS3; leveraged jQuery/Bootstrap to improve UI; supported CI/CD practices to reduce deployment errors and accelerate releases.