Open to opportunities

Eugene Han

@eugenehan

Message

Senior software engineer specializing in scalable full-stack and cloud-native systems.

United States

Message

What I'm looking for

I seek senior engineering roles building scalable, cloud-native systems with strong engineering practices, team collaboration, and opportunities to lead architecture and mentor engineers.

I am a Senior Software Engineer with 12 years of experience building scalable full-stack applications across a wide range of technologies, from JavaScript/TypeScript frontends to PHP and Java backends.

I have led teams to design and deliver SaaS e-commerce platforms, healthcare systems, and high-performance web applications using microservices, event-driven patterns, and containerized deployments on AWS and Azure.

My work spans frontend frameworks (React, Angular, Vue), backend frameworks and languages (Laravel, Express.js, Golang, Ruby on Rails, .NET), databases (PostgreSQL, MySQL, MongoDB) and DevOps practices including Docker, Kubernetes, CI/CD and observability.

I prioritize maintainability, performance, and SEO-driven outcomes—driving measurable improvements such as a 35% increase in organic rankings and significant reductions in bug rates and API calls through testing, state management and query optimizations.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Empower

Jul 2021 - Aug 2025 (4 years 1 month)

Led development of a SaaS e-commerce platform using PHP and GraphQL, migrated legacy codebases to modern frameworks, and improved organic search rankings by 35% through SEO best practices while introducing testing frameworks that reduced bug rates by 30%.

PHP Laravel GraphQL PostgreSQL MongoDB AWS Docker React Jest Cypress

Senior Full Stack Engineer

Olivine

Aug 2018 - Jul 2021 (2 years 11 months)

Led full-stack development for large-scale healthcare applications, implemented HL7/FHIR integrations and scalable microservices, and improved query performance reducing data retrieval times by 30%.

Java Golang Spring Boot gRPC PostgreSQL HL7)Azure Kubernetes React Kafka

Software Engineer

PHC

Nov 2014 - Aug 2018 (3 years 9 months)

Developed backend services and SPAs using Node.js, Express, Angular and Vue, implemented CI/CD with Jenkins and Docker reducing deployment time by 40%, and improved API response times by 20%.

Node Angular Vue.Js MongoDB Docker Jenkins RESTful APIs OAUTH2 JWT

Web Developer

New York City Criminal Justice Agency

Jun 2011 - Nov 2014 (3 years 5 months)

Built large-scale SPAs and real-time data pipelines using React, GraphQL and WebSockets, improved API response times by 20% through backend optimizations, and developed interactive visualizations with D3.js and Highcharts.