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Hi, I'm Christopher Charles Hahn, a Senior Full Stack Engineer and Machine Learning Engineer with over 13 years of experience. I specialize in architecting scalable, AI-powered platforms and have a strong background in Java, Python, and modern frontend frameworks. I love creating solutions that improve operational efficiency and cut costs by leveraging the latest technologies in AI and cloud computing. I have worked across multiple sectors including healthcare, e-commerce, hospitality, and environmental industries. Leading teams and mentoring engineers has been a fulfilling part of my journey, and I'm always excited to tackle complex engineering challenges while driving innovation and collaboration.…Hi, I'm Christopher Charles Hahn, a Senior Full Stack Engineer and Machine Learning Engineer with over 13 years of experience. I specialize in architecting scalable, AI-powered platforms and have a strong background in Java, Python, and modern frontend frameworks. I love creating solutions that improve operational efficiency and cut costs by leveraging the latest technologies in AI and cloud computing. I have worked across multiple sectors including healthcare, e-commerce, hospitality, and environmental industries. Leading teams and mentoring engineers has been a fulfilling part of my journey, and I'm always excited to tackle complex engineering challenges while driving innovation and collaboration.

Christopher Charles Hahn

Full Stack Developer, AI Engineer, DevOps Developer, +1

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Hi, I'm Christopher Charles Hahn, a Senior Full Stack Engineer and Machine Learning Engineer with over 13 years of experience. I specialize in architecting scalable, AI-powered platforms and have a strong background in Java, Python, and modern frontend frameworks. I love creating solutions that improve operational efficiency and cut costs by leveraging the latest technologies in AI and cloud computing. I have worked across multiple sectors including healthcare, e-commerce, hospitality, and environmental industries. Leading teams and mentoring engineers has been a fulfilling part of my journey, and I'm always excited to tackle complex engineering challenges while driving innovation and collaboration.…Hi, I'm Christopher Charles Hahn, a Senior Full Stack Engineer and Machine Learning Engineer with over 13 years of experience. I specialize in architecting scalable, AI-powered platforms and have a strong background in Java, Python, and modern frontend frameworks. I love creating solutions that improve operational efficiency and cut costs by leveraging the latest technologies in AI and cloud computing. I have worked across multiple sectors including healthcare, e-commerce, hospitality, and environmental industries. Leading teams and mentoring engineers has been a fulfilling part of my journey, and I'm always excited to tackle complex engineering challenges while driving innovation and collaboration.

Available to hire

Hi, I’m Christopher Charles Hahn, a Senior Full Stack Engineer and Machine Learning Engineer with over 13 years of experience. I specialize in architecting scalable, AI-powered platforms and have a strong background in Java, Python, and modern frontend frameworks. I love creating solutions that improve operational efficiency and cut costs by leveraging the latest technologies in AI and cloud computing.

I have worked across multiple sectors including healthcare, e-commerce, hospitality, and environmental industries. Leading teams and mentoring engineers has been a fulfilling part of my journey, and I’m always excited to tackle complex engineering challenges while driving innovation and collaboration.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Javanese

Fluent

Work Experience

Senior Full Stack Engineer / Tech Lead at Hyatt Hotel Corporation

June 1, 2022 - Present

Architected and led a full-stack ML-powered platform integrating Java Spring Boot, Python ML pipelines, and React-based frontends for intelligent guest experiences across 1,000+ properties. Rebuilt Databricks workflows with Apache Spark for distributed feature engineering and batch inference, integrated with real-time React dashboards. Delivered LLM-powered web apps with React 18 and OpenAI APIs, achieving 40% faster chatbot response times. Created multi-agent AI automation tools, improved workflow observability, and deployed production-grade GenAI chatbots boosting self-service engagement by 30% while reducing support tickets by 40%. Led frontend optimization reducing load times by 45%, implemented secure OAuth 2.0 REST APIs with Azure AD B2C authentication, managed ETL pipelines, directed CI/CD deployments on AWS, and enhanced observability reducing incident resolution times by 50%. Mentored 6+ engineers and led Agile ceremonies.

Senior Software Engineer (AI/ML Focus) at Urbint

June 1, 2022 - July 29, 2025

Designed recommendation engines using collaborative filtering and content-based algorithms boosting e-commerce conversion rates by 30%. Built backend Java Spring Boot services for real-time AI inference and integrated APIs. Developed medical imaging AI pipelines with YOLOv3 and Faster R-CNN improving image classification accuracy by 15% via transfer learning. Engineered predictive models for drug toxicity and efficacy deployed on AWS EC2. Delivered NLP pipelines for social sentiment analysis improving content relevance. Developed time-series forecasting for air quality anomalies with Java APIs. Maintained ML data platform using Kafka, PostgreSQL, and automated training pipelines with Docker and cron jobs.

Senior Full Stack Engineer / Java Developer at Optum

October 31, 2020 - July 29, 2025

Led backend microservice development migrating monolithic systems to Spring Boot architecture enhancing modularity and scalability. Designed FHIR-compliant REST APIs for EHR integration reducing timelines by 40%. Built Angular-based clinician dashboards for healthcare analytics. Developed event-driven systems processing over 10 million clinical events daily via Kafka and RabbitMQ. Integrated early NLP services for clinical text analysis. Established HIPAA-compliant security practices using Spring Security and OAuth 2.0. Implemented CI/CD pipelines and migrated deployments to AWS ECS. Enhanced infrastructure monitoring with Grafana and Elasticsearch. Mentored junior engineers and collaborated with clinical product teams.