Julian Chen
@julianpchen
Senior software engineer specializing in large-scale platforms, full-stack delivery, and AI-enabled customer products.
IrelandWhat I'm looking for
I’m a Senior Software Engineer with 12+ years building large-scale customer platforms, internal systems, and AI-enabled products across Microsoft, Twitter, and Hyatt. I bring strong full-stack engineering depth with hands-on work in React, Next.js, ReactNative, Node.js, Python, and distributed APIs—focused on shipping production outcomes.
I’ve modernized complex systems and improved performance, reliability, and identity resilience in regulated, high-scale environments. At Hyatt, I architected guest-facing applications for the World of Hyatt ecosystem (1,000+ properties), implemented OAuth2.0 and AzureADB2C authentication flows, and delivered an LLM-powered chatbot/recommendation feature that reduced support ticket volume by 40% and increased self-service adoption by 30%.
I also excel at end-to-end ownership—from architecture and development to deployment, observability, testing, and cross-functional delivery. I’ve led release processes across AWS ECS, EKS, Docker, GitHub Actions, and GitLab CI (zero-downtime deployments; +30% release predictability) and built data-driven workflows with Airflow, Kafka, and Pandas (35% faster reporting turnaround), while mentoring 6+ engineers to accelerate onboarding.
Experience
Work history, roles, and key accomplishments
Architected and delivered guest-facing web and API applications with Next.js, React, and Node.js across 1,000+ Hyatt properties. Improved identity reliability and reduced account-related support escalations by 20%, cut support tickets by 40% with an LLM chatbot, and boosted frontend performance by 45%.
Built real-time recommendation and feed ranking services using Node.js microservices and Python ML inference, improving targeted engagement metrics by 18% while supporting GDPR-aligned data handling. Developed React and React Native internal tools and Trust & Safety workflows using NLP and computer vision, improving harmful content detection quality by 15% and reducing manual review burden in key
Migrated enterprise systems to Azure-based microservices using Node.js, Python, and .NET Core, reducing deployment cycles by 60% and improving service reliability. Built secure REST/GraphQL enterprise APIs for healthcare and finance and delivered ML pipelines with Databricks and Spark, improving model delivery efficiency by 25% and reducing targeted compute costs by 20%.
Education
Degrees, certifications, and relevant coursework
University College Dublin
Master of Science in Computer Science, Computer Science
2012 - 2013
Earned an MSc in Computer Science at University College Dublin in 2012–2013.
Fudan University
Bachelor of Science in Computer Science, Computer Science
2008 - 2012
Earned a BSc in Computer Science at Fudan University in 2008–2012.
Availability
Location
IrelandAuthorized to work in
Job categories
Skills
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