Open to opportunities

Julian Chen

@julianchen

Message

Senior full-stack engineer specializing in cloud-native and AI-enabled platforms.

Ireland

Message

What I'm looking for

I seek senior engineering roles building cloud-native, AI-enabled platforms with strong emphasis on security, compliance, mentorship, and scalable CI/CD.

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

Current

Senior Full Stack Engineer

Current

Hyatt Hotels Corporation

Jan 2023 - Present (2 years 9 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.

Next.js React Node Python LLM CI CD Airflow

Software Engineer

Twitter

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.

Node Python React React Native NLP YOLOv3 Kafka GDPR Compliance

Software Engineer

Microsoft Ireland

Apr 2014 - Mar 2020 (5 years 11 months)

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.