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I'm Justin Lee, a Staff Software Engineer with hands-on experience building scalable AI-powered systems and e-commerce platforms. At Amazon I led the development of a microservices-based backend and a high-performance frontend, delivering features that boosted engagement and mobile conversions. I thrive in fast-paced environments, mentor teammates, and enjoy turning complex problems into reliable, high-impact products. I specialize in end-to-end product development, from secure API design and authentication (OAuth 2.0, JWT) to AI-driven recommendations and conversational assistants. I love collaborating with product and design to ship features that improve user experience, reliability, and velocity across the software delivery lifecycle.…I'm Justin Lee, a Staff Software Engineer with hands-on experience building scalable AI-powered systems and e-commerce platforms. At Amazon I led the development of a microservices-based backend and a high-performance frontend, delivering features that boosted engagement and mobile conversions. I thrive in fast-paced environments, mentor teammates, and enjoy turning complex problems into reliable, high-impact products. I specialize in end-to-end product development, from secure API design and authentication (OAuth 2.0, JWT) to AI-driven recommendations and conversational assistants. I love collaborating with product and design to ship features that improve user experience, reliability, and velocity across the software delivery lifecycle.

Justin Lee

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

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I'm Justin Lee, a Staff Software Engineer with hands-on experience building scalable AI-powered systems and e-commerce platforms. At Amazon I led the development of a microservices-based backend and a high-performance frontend, delivering features that boosted engagement and mobile conversions. I thrive in fast-paced environments, mentor teammates, and enjoy turning complex problems into reliable, high-impact products. I specialize in end-to-end product development, from secure API design and authentication (OAuth 2.0, JWT) to AI-driven recommendations and conversational assistants. I love collaborating with product and design to ship features that improve user experience, reliability, and velocity across the software delivery lifecycle.…I'm Justin Lee, a Staff Software Engineer with hands-on experience building scalable AI-powered systems and e-commerce platforms. At Amazon I led the development of a microservices-based backend and a high-performance frontend, delivering features that boosted engagement and mobile conversions. I thrive in fast-paced environments, mentor teammates, and enjoy turning complex problems into reliable, high-impact products. I specialize in end-to-end product development, from secure API design and authentication (OAuth 2.0, JWT) to AI-driven recommendations and conversational assistants. I love collaborating with product and design to ship features that improve user experience, reliability, and velocity across the software delivery lifecycle.

Available to hire

I’m Justin Lee, a Staff Software Engineer with hands-on experience building scalable AI-powered systems and e-commerce platforms. At Amazon I led the development of a microservices-based backend and a high-performance frontend, delivering features that boosted engagement and mobile conversions. I thrive in fast-paced environments, mentor teammates, and enjoy turning complex problems into reliable, high-impact products.

I specialize in end-to-end product development, from secure API design and authentication (OAuth 2.0, JWT) to AI-driven recommendations and conversational assistants. I love collaborating with product and design to ship features that improve user experience, reliability, and velocity across the software delivery lifecycle.

Skills

Experience Level

Expert

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Intermediate

Intermediate

Work Experience

Staff Software Engineer at Amazon

July 20, 2019 - Present

Designed and built Amazon Haul, a scalable, AI-powered, microservices-based ecommerce platform with a backend using Java, Spring Boot, and AWS, and a high-performance frontend using Next.js, TypeScript, and Tailwind CSS, delivering dynamic product pages, personalized home feeds, and adaptive carts that improved user engagement and significantly increased mobile conversion rates. Built an AI-powered recommendation system using Python / FastAPI and Amazon’s LLM ecosystem, integrating user behavior signals and product metadata to deliver personalized suggestions across the shopping journey, resulting in a measurable uplift in customer satisfaction and a 25% increase in sales. Led a small team of engineers in designing and developing the AI prototype for Rufus Agents, leveraging Python / FastAPI and a RAG pipeline to provide conversational shopping assistance, significantly enhancing user experience and driving a 30% increase in customer engagement. Built RESTful APIs with Spring Boot fo

Senior Software Engineer at Amwell

June 1, 2015 - July 1, 2019

Contributed to the migration of legacy telehealth services to the cloud-native Converge platform, refactoring monolithic Java/Spring Boot applications into microservices on AWS (ECS, Lambda, RDS), reducing downtime and increasing virtual visit success rates by over 20%. Developed end-to-end video consultation features using WebRTC and secure signaling, integrated with EHR systems via HL7/FHIR interfaces, and built modular frontends with React and micro-frontend architecture. Implemented monitoring and event-driven alerts with CloudWatch and Lambda to improve uptime, and used Kafka to decouple services for scalable real-time sessions. Designed relational schemas with indexing and partitioning to balance HIPAA requirements with performance.