Julian Chen
@julianchen
Senior full-stack engineer specializing in cloud-native and AI-enabled platforms.
IrelandWhat I'm looking for
I am a senior full-stack engineer with 12+ years building secure, scalable, AI-powered platforms at Microsoft, Twitter, and Hyatt. I specialize in modern frontend frameworks, backend services, and cloud/DevOps architectures.
At Hyatt I architected Next.js and React18 guest-facing apps integrated with Node.js and Python APIs across 1,000+ properties, built LLM-powered chatbots and recommendation engines, and led CI/CD and zero-downtime deployments to AWS ECS/EKS.
At Twitter I developed real-time recommendation and feed ranking systems, Trust & Safety AI pipelines, and low-latency GDPR-compliant ML inference that improved engagement and moderation metrics. At Microsoft I migrated enterprise systems to Azure microservices, embedded ML into Microsoft 365, and optimized inference pipelines for cost and latency.
I mentor engineers, run Agile ceremonies, and drive cross-functional alignment to deliver high-performance digital platforms that meet security, compliance (GDPR/HIPAA/PCI), and production-readiness requirements.
Experience
Work history, roles, and key accomplishments
Senior Full Stack Engineer
Hyatt Hotels Corporation
Jan 2023 - Present (3 years 5 months)
Architected Next.js/React18 guest-facing apps and Node.js/Python APIs across 1,000+ properties, built LLM chatbots and recommendation engines that reduced support tickets by 40% and increased self-service by 30%. Led CI/CD adoption and mentored a team of 6+ engineers to deliver resilient AWS/Azure deployments and unified dashboards.
Software Engineer
May 2020 - Nov 2022 (2 years 6 months)
Built Node.js microservices and Python ML inference for real-time recommendation and feed ranking, increasing EU user engagement by 30% while ensuring GDPR-compliant data handling; improved moderation accuracy by 15% with NLP/CV pipelines.
Migrated EU enterprise systems to Azure microservices and automated CI/CD, reducing deployment cycles by 60% and accelerating multi-platform delivery by 40%; built secure FHIR/REST/GraphQL APIs for GDPR/HIPAA-compliant solutions.
Education
Degrees, certifications, and relevant coursework
University College Dublin
Master of Science, Computer Science
2012 - 2013
Completed a Master of Science in Computer Science with coursework and projects in advanced computing and cloud-native architectures.
Fudan University
Bachelor of Science, Computer Science
2008 - 2012
Completed a Bachelor of Science in Computer Science with foundational training in software engineering, algorithms, and systems.
Tech stack
Software and tools used professionally
Availability
Location
IrelandAuthorized to work in
Job categories
Skills
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