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Hi, I’m Justin Lee, a Senior Full Stack Engineer with 8+ years of experience designing and delivering enterprise-grade web and cloud applications across healthcare, fintech, and education. I thrive on building scalable systems, improving performance, and delivering cloud-native solutions with AWS, Docker, Kubernetes, and Terraform. I’ve consistently driven measurable results, including tripling system throughput and reducing API latency, while partnering with cross-functional teams to ship reliable software. I’ve led and mentored teams of engineers, coached through pair programming and code reviews, and collaborated closely with clients to accelerate deployments and improve reliability. I’m passionate about REST and GraphQL APIs, CI/CD automation, and test-driven development with Jest and Cypress, always aiming to deliver high-quality software that users love.…Hi, I’m Justin Lee, a Senior Full Stack Engineer with 8+ years of experience designing and delivering enterprise-grade web and cloud applications across healthcare, fintech, and education. I thrive on building scalable systems, improving performance, and delivering cloud-native solutions with AWS, Docker, Kubernetes, and Terraform. I’ve consistently driven measurable results, including tripling system throughput and reducing API latency, while partnering with cross-functional teams to ship reliable software. I’ve led and mentored teams of engineers, coached through pair programming and code reviews, and collaborated closely with clients to accelerate deployments and improve reliability. I’m passionate about REST and GraphQL APIs, CI/CD automation, and test-driven development with Jest and Cypress, always aiming to deliver high-quality software that users love.

Justin Lee

Full Stack Developer, Web Developer, Back-End Developer, +4

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Hi, I’m Justin Lee, a Senior Full Stack Engineer with 8+ years of experience designing and delivering enterprise-grade web and cloud applications across healthcare, fintech, and education. I thrive on building scalable systems, improving performance, and delivering cloud-native solutions with AWS, Docker, Kubernetes, and Terraform. I’ve consistently driven measurable results, including tripling system throughput and reducing API latency, while partnering with cross-functional teams to ship reliable software. I’ve led and mentored teams of engineers, coached through pair programming and code reviews, and collaborated closely with clients to accelerate deployments and improve reliability. I’m passionate about REST and GraphQL APIs, CI/CD automation, and test-driven development with Jest and Cypress, always aiming to deliver high-quality software that users love.…Hi, I’m Justin Lee, a Senior Full Stack Engineer with 8+ years of experience designing and delivering enterprise-grade web and cloud applications across healthcare, fintech, and education. I thrive on building scalable systems, improving performance, and delivering cloud-native solutions with AWS, Docker, Kubernetes, and Terraform. I’ve consistently driven measurable results, including tripling system throughput and reducing API latency, while partnering with cross-functional teams to ship reliable software. I’ve led and mentored teams of engineers, coached through pair programming and code reviews, and collaborated closely with clients to accelerate deployments and improve reliability. I’m passionate about REST and GraphQL APIs, CI/CD automation, and test-driven development with Jest and Cypress, always aiming to deliver high-quality software that users love.

Available to hire

Hi, I’m Justin Lee, a Senior Full Stack Engineer with 8+ years of experience designing and delivering enterprise-grade web and cloud applications across healthcare, fintech, and education. I thrive on building scalable systems, improving performance, and delivering cloud-native solutions with AWS, Docker, Kubernetes, and Terraform. I’ve consistently driven measurable results, including tripling system throughput and reducing API latency, while partnering with cross-functional teams to ship reliable software.

I’ve led and mentored teams of engineers, coached through pair programming and code reviews, and collaborated closely with clients to accelerate deployments and improve reliability. I’m passionate about REST and GraphQL APIs, CI/CD automation, and test-driven development with Jest and Cypress, always aiming to deliver high-quality software that users love.

Skills

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Expert

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Expert

Expert

Expert

Expert

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Intermediate

Language

English

Fluent

Aragonese

Advanced

Work Experience

Senior Full Stack Engineer at Perficient

August 1, 2025 - September 29, 2025

Developed secure Python/Django APIs for patient data exchange with healthcare partners, achieving HIPAA compliance and reducing manual data reconciliation by 80%. Designed a HIPAA-compliant patient portal using Next.js, React, TypeScript, and Node.js with PostgreSQL on AWS S3, tripling document processing throughput. Built cloud-native Go services on Kubernetes (EKS) enabling real-time communication across distributed systems and reducing inter-service error rates by 40%. Architected microservices with NestJS, GraphQL, Redis, and Kubernetes to cut API response times by 60% and boost checkout conversions by 12%. Implemented IaC and CI/CD pipelines with Terraform, Docker, and GitHub Actions, accelerating deployments by 70% and ensuring reliable rollbacks.

Software Developer at Slalom

February 1, 2023 - September 29, 2025

Migrated monolithic analytics platforms to AWS microservices with Docker and Terraform, cutting infrastructure costs by 30% and improving uptime. Implemented Python-based ETL pipelines with Pandas and AWS Lambda, reducing data transformation times from 4 hours to under 30 minutes. Rebuilt legacy UI as a Next.js/React SPA integrated with GraphQL APIs, cutting page load times by 50% and boosting user engagement. Designed and deployed Go services to support a customer identity platform, handling 50K+ concurrent sessions with 91% uptime. Developed ETL pipelines in Node.js and Python with PostgreSQL, enabling near-real-time BI and shifting reports from daily to hourly delivery. Enhanced QA automation with Cypress and Jest, reducing regression cycles by 60% and production bugs by 30%. Automated cloud-native workflows with Python scripts and Kubernetes operators, eliminating 20+ hours per month of manual ops. Trained 5 client engineers on CI/CD best practices, improving onboarding time and re

Full Stack Developer at MentorMate

December 1, 2020 - September 29, 2025

Delivered 10+ mobile-first web applications used by 200K+ users in healthcare, fintech, and education, ensuring WCAG accessibility compliance and building responsive PWAs with React, Vue.js, and Nuxt.js. Built RESTful backends in Laravel and Django with MySQL/PostgreSQL databases and JWT authentication, increasing system scalability by 40% and API reliability to 90% uptime. Optimized front-end performance with Webpack code-splitting and tree-shaking, reducing bundle sizes by 45% and improving average load times from 4.5s to 2.2s. Introduced automated testing pipelines with Jest and Cypress, cutting post-release bugs and reducing hotfix frequency by 35%.

Senior Full Stack Engineer at Perficient

August 1, 2025 - September 29, 2025

Implemented Python/Django APIs for secure patient data exchange with healthcare partners, achieving 100% HIPAA compliance and reducing manual data reconciliation by 80%. Designed and built a HIPAA-compliant patient portal using Next.js, React, TypeScript, and Node.js with PostgreSQL on AWS S3, tripling document processing throughput. Built cloud-native Go-based gRPC services deployed on Kubernetes (EKS) to enable real-time communication across distributed systems, reducing inter-service error rates by 40%. Architected microservices with NestJS, GraphQL, Redis, and Kubernetes, cutting API response times by 60% and boosting checkout conversions by 12% for a retail client. Created real-time analytics dashboards with Next.js, GraphQL, and Prisma, reducing reporting time by 40%. Engineered Go-based microservices handling 1M+ daily requests, reducing average latency by 55% and tripling throughput. Implemented IaC and CI/CD pipelines with Terraform, Docker, and GitHub Actions, accelerating de

Software Developer at Slalom

February 1, 2023 - September 29, 2025

Migrated monolithic analytics platforms to AWS microservices with Docker and Terraform, reducing infrastructure costs by 30% and improving uptime. Implemented Python-based ETL pipelines with Pandas and AWS Lambda, cutting data transformation times from 4 hours to under 30 minutes. Rebuilt legacy UI as a Next.js/React SPA integrated with GraphQL APIs, halving page load times and boosting user engagement. Designed and deployed Go services to support a customer identity platform, handling 50K+ concurrent sessions with 91% uptime. Developed ETL pipelines in Node.js and Python with PostgreSQL, enabling near-real-time BI and shifting reports from daily to hourly delivery. Enhanced QA automation with Cypress and Jest, reducing regression cycles by 60% and production bugs by 30%. Automated cloud-native workflows with Python scripts and Kubernetes operators, saving 20+ hours per month in manual ops. Trained 5 client engineers on CI/CD best practices, reducing onboarding time by 25% and improvin

Full Stack Developer at MentorMate

December 1, 2020 - September 29, 2025

Delivered 10+ mobile-first web applications used by 200K+ users across healthcare, fintech, and education, ensuring WCAG accessibility and building responsive PWAs with React, Vue.js, and Nuxt.js. Built RESTful backends in Laravel and Django with MySQL/PostgreSQL and JWT authentication, improving system scalability by 40% and API reliability to 90% uptime. Optimized front-end performance with Webpack code-splitting and tree-shaking, reducing bundle sizes by 45% and lowering average load times from 4.5s to 2.2s. Introduced automated testing pipelines with Jest and Cypress, reducing post-release bugs and hotfix frequency by 35%.

Senior Full Stack Engineer at Perficient

August 1, 2025 - September 29, 2025

Led development of Python/Django APIs for secure patient data exchange with healthcare partners, achieving 100% HIPAA compliance and cutting manual data reconciliation by 80%. Designed a HIPAA-compliant patient portal using Next.js, React, TypeScript, and Node.js with PostgreSQL on AWS S3, tripling document processing throughput. Built cloud-native gRPC services in Go deployed on Kubernetes (EKS), enabling real-time inter-service communication and reducing inter-service error rates by 40%. Architected microservices with NestJS, GraphQL, Redis, and Kubernetes, cutting API response times by 60% and boosting checkout conversions by 12%. Implemented real-time analytics dashboards with Next.js, GraphQL, and Prisma, reducing reporting time by 40%. Engineered Go-based microservices for high-volume claims processing (1M+ daily requests), reducing average latency by 55% and increasing overall throughput by 3x. Implemented IaC and CI/CD pipelines (Terraform, Docker, GitHub Actions) accelerating

Software Developer at Slalom

February 1, 2023 - September 29, 2025

Migrated monolithic analytics platforms to AWS microservices using Docker and Terraform, cutting infrastructure costs by 30% and improving uptime. Implemented Python-based ETL pipelines leveraging Pandas and AWS Lambda, reducing data transformation times from 4 hours to under 30 minutes. Rebuilt legacy UI as a Next.js/React SPA integrated with GraphQL APIs, slashing page load times by 50% and improving user engagement. Designed and deployed Go services to support a customer identity platform, handling 50K+ concurrent sessions with 91% uptime. Developed ETL pipelines in Node.js and Python with PostgreSQL, enabling near-real-time business intelligence and shifting reports from daily to hourly. Enhanced QA automation with Cypress and Jest, reducing regression cycles by 60% and cutting production bugs by 30%. Automated cloud-native workflows with Python scripts and Kubernetes operators, eliminating 20+ hours/month of manual ops effort. Trained 5 client engineers on CI/CD best practices, re

Full Stack Developer at MentorMate

December 1, 2020 - September 29, 2025

Delivered 10+ mobile-first web applications used by 200K+ users across healthcare, fintech, and education, ensuring WCAG accessibility and building responsive PWAs with React, Vue.js, and Nuxt.js. Built RESTful backends with Laravel and Django using MySQL/PostgreSQL and JWT authentication, improving scalability by 40% and achieving 90% uptime. Optimized front-end performance with Webpack code-splitting and tree-shaking, cutting bundle sizes by 45% and reducing average load times from 4.5s to 2.2s. Introduced automated testing pipelines with Jest and Cypress, cutting post-release bugs and reducing hotfix frequency by 35%.

Senior Full Stack Engineer at Perficient

August 1, 2025 - September 29, 2025

Led development of secure HIPAA-compliant healthcare APIs and patient data exchange; built a HIPAA-compliant patient portal using Next.js, React, TypeScript, and Node.js with PostgreSQL on AWS; implemented cloud-native Go microservices on Kubernetes (EKS) for real-time inter-service communication; architected NestJS GraphQL microservices with Redis; delivered real-time analytics dashboards; built Go-based high-volume claims services; implemented IaC and CI/CD pipelines with Terraform, Docker, and GitHub Actions; mentored a 7-person engineering team.

Software Developer at Slalom

February 1, 2023 - September 29, 2025

Migrated monolithic analytics platforms to AWS microservices with Docker and Terraform; built Python ETL pipelines with Pandas and AWS Lambda; rebuilt legacy UI as a Next.js/React SPA integrated with GraphQL; designed Go services to support a customer identity platform with 50K+ concurrent sessions; developed ETL pipelines in Node.js and Python with PostgreSQL for near-real-time BI; enhanced QA automation with Cypress and Jest; automated cloud-native workflows and trained client engineers on CI/CD.

Full Stack Developer at MentorMate

December 1, 2020 - September 29, 2025

Delivered 10+ mobile-first web applications used by 200K+ users across healthcare, fintech, and education; built RESTful backends in Laravel and Django with MySQL/PostgreSQL and JWT authentication; optimized frontend performance with code-splitting and tree-shaking; introduced automated testing pipelines with Jest and Cypress, reducing post-release bugs and hotfix frequency.

Senior Full Stack Engineer at Perficient

August 1, 2025 - September 29, 2025

Developed Python/Django APIs for secure patient data exchange with healthcare partners, achieving 100% HIPAA compliance and reducing manual data reconciliation by 80%. Led design and development of a HIPAA-compliant patient portal using Next.js, React, TypeScript, and Node.js with PostgreSQL on AWS S3, tripling document processing throughput. Built cloud-native gRPC services in Go deployed on Kubernetes (EKS), enabling real-time cross-system communication and lowering inter-service error rates by 40%. Architected microservices with NestJS, GraphQL, Redis, and Kubernetes, reducing API response times by 60% and boosting checkout conversions by 12%. Built real-time analytics dashboards with Next.js, GraphQL, and Prisma, cutting reporting time by 40%. Implemented IaC and CI/CD pipelines with Terraform, Docker, and GitHub Actions, accelerating deployments by 70% and enabling reliable rollbacks. Mentored a 7-person engineering team to improve sprint delivery accuracy from 70% to 95%.

Software Developer at Slalom

February 1, 2023 - September 29, 2025

Migrated monolithic analytics platforms to AWS-based microservices with Docker and Terraform, cutting infrastructure costs by 30% and improving uptime. Implemented Python-based ETL pipelines leveraging Pandas and AWS Lambda, reducing data transformation times from 4 hours to under 30 minutes. Rebuilt legacy UI as a Next.js/React SPA integrated with GraphQL APIs, slashing page load times by 50% and improving user engagement. Designed and deployed Go services to support a customer identity platform, handling 50K+ concurrent sessions with 91% uptime. Enhanced QA automation with Cypress and Jest, reducing regression cycles by 60% and cutting production bugs by 30%.

Full Stack Developer at MentorMate

December 1, 2020 - September 29, 2025

Delivered 10+ mobile-first web applications used by 200K+ users in healthcare, fintech, and education, ensuring WCAG accessibility compliance; built responsive PWAs with React, Vue.js, and Nuxt.js. Built RESTful backends in Laravel and Django with MySQL/PostgreSQL and JWT authentication, increasing scalability by 40% and API reliability to 90% uptime. Optimized front-end performance with Webpack code-splitting and tree-shaking, reducing bundle sizes by 45% and improving load times from 4.5s to 2.2s. Introduced automated testing pipelines with Jest and Cypress, cutting post-release bugs and reducing hotfix frequency by 35%.

Senior Full Stack Engineer at Perficient

August 1, 2025 - September 29, 2025

Developed Python/Django APIs for secure patient data exchange with healthcare partners, achieving 100% HIPAA compliance and cutting manual data reconciliation by 80%. Designed and developed a HIPAA-compliant patient portal using Next.js, React, TypeScript, and Node.js with PostgreSQL on AWS S3, tripling document processing throughput. Built cloud-native gRPC services in Go deployed on Kubernetes (EKS), enabling real-time communication across distributed systems and decreasing inter-service error rates by 40%. Architected microservices with NestJS, GraphQL, Redis, and Kubernetes, cutting API response times by 60% and boosting checkout conversions by 12% for a retail client. Built real-time analytics dashboards with Next.js, GraphQL, and Prisma, cutting reporting time by 40%. Engineered Go-based microservices for high-volume claims processing (handling 1M+ daily requests), reducing average request latency by 55% and increasing overall throughput by 3x. Implemented IaC and CI/CD pipelines

Software Developer at Slalom

February 1, 2023 - September 29, 2025

Migrated monolithic analytics platforms to AWS microservices with Docker and Terraform, cutting infrastructure costs by 30% and improving uptime. Implemented Python-based ETL pipelines leveraging Pandas and AWS Lambda, reducing data transformation times from 4 hours to under 30 minutes. Rebuilt legacy UI as a Next.js/React SPA integrated with GraphQL APIs, slashing page load times by 50% and improving user engagement. Designed and deployed Go services to support a customer identity platform, handling 50K+ concurrent sessions with 91% uptime. Developed ETL pipelines in Node.js and Python with PostgreSQL, enabling near-real-time business intelligence and shifting reports from daily to hourly delivery. Enhanced QA automation with Cypress and Jest, reducing regression cycles by 60% and cutting production bugs by 30%. Automated cloud-native workflows with Python scripts and Kubernetes operators, eliminating 20+ hours/month of manual ops effort. Trained 5 client engineers on CI/CD best pract

Full Stack Developer at MentorMate

December 1, 2020 - September 29, 2025

Delivered 10+ mobile-first web applications used by 200K+ users in healthcare, fintech, and education, ensuring WCAG accessibility compliance, building responsive PWAs with React, Vue.js, and Nuxt.js. Built RESTful backends in Laravel and Django with MySQL/PostgreSQL databases and JWT authentication, increasing system scalability by 40% and boosting API reliability to 90% uptime. Optimized front-end performance with Webpack code-splitting and tree-shaking, reducing bundle sizes by 45% and improving average load times from 4.5s to 2.2s. Introduced automated testing pipelines with Jest and Cypress, cutting post-release bugs and reducing hotfix frequency by 35%.

Senior Full Stack Engineer at Perficient

August 1, 2025 - September 29, 2025

Developed Python/Django APIs for secure patient data exchange with healthcare partners (HIPAA-compliant), reducing manual data reconciliation by 80%. Built a HIPAA-compliant patient portal using Next.js/React/TypeScript with AWS S3, tripling document processing throughput. Implemented cloud-native Go gRPC services on Kubernetes (EKS) for real-time inter-service communication and lowering inter-service error rates by 40%. Architected microservices with NestJS, GraphQL, Redis, and Kubernetes to reduce API response times by 60% and boost checkout conversions by 12% for a retail client. Led IaC/CI/CD pipelines using Terraform, Docker, and GitHub Actions, shortening deployments from 10 hours to 3 hours. Mentored a 7-person engineering team.

Software Developer at Slalom

February 1, 2023 - September 29, 2025

Migrated monolithic analytics platforms to AWS microservices with Docker and Terraform, cutting infrastructure costs by 30% and improving uptime. Implemented Python/Pandas ETL with AWS Lambda, reducing data transformation times from 4 hours to under 30 minutes. Rebuilt legacy UI as a Next.js/React SPA with GraphQL integration, decreasing page load times by 50%. Designed Go services to support a customer identity platform handling 50K+ concurrent sessions with 91% uptime. Developed ETL pipelines in Node.js and Python with PostgreSQL for near-real-time BI. Enhanced QA automation with Cypress and Jest, reducing regression cycles by 60% and production bugs by 30%. Automated cloud-native workflows with Python scripts and Kubernetes operators, saving 20+ hours/month. Trained client engineers on CI/CD practices to improve release consistency.

Full Stack Developer at MentorMate

December 1, 2020 - September 29, 2025

Delivered 10+ mobile-first web applications used by 200K+ users across healthcare, fintech, and education, ensuring WCAG accessibility and building responsive PWAs with React, Vue.js, and Nuxt.js. Built RESTful backends in Laravel and Django with MySQL/PostgreSQL and JWT authentication, increasing scalability by 40% and achieving 90% uptime. Optimized front-end performance with code-splitting and tree-shaking, reducing bundle sizes by 45% and cutting load times from 4.5s to 2.2s. Introduced automated testing pipelines with Jest and Cypress, reducing post-release bugs and hotfix frequency by 30-35%.

Senior Full Stack Engineer at Perficient

August 1, 2025 - September 30, 2025

Designed and developed a HIPAA-compliant patient portal using Next.js, React, TypeScript, and Node.js with PostgreSQL on AWS S3, tripling document processing throughput. Architected microservices with NestJS, GraphQL, Redis, and Kubernetes, cutting API response times by 60% and boosting checkout conversions by 12% for a retail client. Built real-time analytics dashboards with Next.js, GraphQL, and Prisma, cutting reporting time by 40%. Implemented IaC and CI/CD pipelines, accelerating deployments by 70% (from 10 hours to 3 hours) with Terraform, Docker, and GitHub Actions, and ensuring reliable rollbacks. Collaborated with stakeholders on solution design and proposals, helping secure $1.2M in new client contracts. Led and mentored a 7-person engineering team, coaching through pair programming and code reviews; boosted sprint delivery accuracy from 70% to 95%.

Software Developer at Slalom

February 1, 2023 - September 30, 2025

Migrated monolithic analytics platforms to AWS microservices with Docker and Terraform, cutting infrastructure costs by 30% and improving uptime. Rebuilt legacy UI as a React/Next.js SPA integrated with GraphQL APIs, slashing page load times by 50% and improving user engagement. Developed ETL pipelines in Node.js and Python with PostgreSQL, enabling near-real-time business intelligence and shifting reports from daily to hourly delivery. Enhanced QA automation with Cypress and Jest, reducing regression cycles by 60% and cutting production bugs by 30%. Trained 5 client engineers on CI/CD best practices, reducing onboarding time by 25% and improving release consistency.

Full Stack Developer at MentorMate

December 1, 2020 - September 30, 2025

Senior Full Stack Engineer at Perficient

August 1, 2025 - September 30, 2025

Developed Python/Django APIs for secure patient data exchange with healthcare partners, achieving 100% HIPAA compliance and reducing manual data reconciliation by 80%. Designed a HIPAA-compliant patient portal using Next.js/React/TypeScript/Node.js with PostgreSQL on AWS S3, tripling document processing throughput. Built cloud-native gRPC services in Go deployed on Kubernetes (EKS), enabling real-time inter-service communication and reducing inter-service error rates by 40%. Architected microservices with NestJS, GraphQL, Redis, and Kubernetes, cutting API response times by 60% and boosting checkout conversions by 12% for a retail client. Created real-time analytics dashboards with Next.js, GraphQL, and Prisma, cutting reporting time by 40%. Led and mentored a 7-person engineering team.

Software Developer at Slalom

February 1, 2023 - September 30, 2025

Migrated monolithic analytics platforms to AWS microservices using Docker and Terraform, reducing infrastructure costs by 30% and improving uptime. Implemented Python ETL pipelines with Pandas and AWS Lambda, shortening data transformations from 4 hours to under 30 minutes. Rebuilt legacy UI as a Next.js/React SPA integrated with GraphQL, cutting page load times by 50%. Designed Go services to support a customer identity platform handling 50K+ concurrent sessions with 91% uptime. Developed ETL pipelines in Node.js and Python with PostgreSQL enabling near-real-time BI and hourly reporting. Enhanced QA automation with Cypress and Jest, reducing regression cycles by 60% and production bugs by 30%. Automated cloud-native workflows with Python scripts and Kubernetes operators, eliminating 20+ hours/month of manual ops. Trained 5 client engineers on CI/CD best practices, reducing onboarding time by 25%.

Full Stack Developer at MentorMate

December 1, 2020 - September 30, 2025

Delivered 10+ mobile-first web applications used by 200K+ users across healthcare, fintech, and education, ensuring WCAG accessibility. Built RESTful backends in Laravel and Django with MySQL/PostgreSQL and JWT authentication, increasing scalability by 40% and uptime to 90%. Optimized front-end performance with Webpack code-splitting and tree-shaking, reducing bundle sizes by 45% and load times from 4.5s to 2.2s. Introduced automated testing pipelines with Jest and Cypress, cutting post-release bugs and hotfix frequency by 35%.