Open to opportunities

Thoo Loon

@thooloon

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Senior Full Stack Java engineer building secure microservices, cloud-native systems, and AI-powered RAG platforms.

United States

Message

What I'm looking for

I’m looking to lead cloud-native full stack Java systems—secure microservices, AI/RAG workflows, and real-time experiences—where I can own architecture, ship reliable CI/CD, and improve performance using strong observability and engineering discipline.

I’m a Senior Full Stack Java Engineer with 8 years of experience designing, developing, and deploying scalable enterprise backends using Java (JDK 17–21), Spring Boot, and microservices architecture. I build RESTful APIs and high-performance backend services integrated with SQL databases (PostgreSQL/MySQL), focusing on data modeling, query optimization, and performance tuning for enterprise-grade applications.

In cloud-native environments, I lead distributed systems delivered on Azure—especially Azure Kubernetes Service (AKS)—and I’m hands-on with Docker/Kubernetes, Helm, and reliability-focused microservices patterns. I also deliver AI platforms (RAG, embeddings, vector indexing) and event-driven workflows using Kafka Streams, WebSockets, and Spring WebFlux, supported by CI/CD with Jenkins/Azure DevOps and end-to-end observability (OpenTelemetry, Azure Monitor, Splunk) to keep production systems secure, resilient, and fast.

Experience

Work history, roles, and key accomplishments

Senior Java Full Stack Engineer

Kayrros

Sep 2024 - Mar 2026 (1 year 6 months)

Architected and delivered a scalable RAG-based enterprise platform using Java Spring Boot with Azure Kubernetes Service (AKS) as the runtime for microservices orchestrating distributed inference pipelines over multi-format datasets (billions of records). Built event-driven real-time interaction workflows and high-throughput ingestion pipelines using Kafka Streams and reactive Java (Spring WebFlux)

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Senior Java Full Stack Engineer

Texas Medical Center

Apr 2022 - Aug 2024 (2 years 4 months)

Architected and implemented contact-center-style document ingestion, retrieval, and agent-assist workflows for large-scale legal and healthcare corpora, deploying Java Spring Boot microservices to OCP-style PaaS environments and enabling real-time retrieval augmentation. Engineered high-throughput dashboards and Kafka-driven vector search pipelines supporting low-latency recommendations across mil

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Full Stack Java Developer

Stirista

Dec 2017 - Mar 2022 (4 years 3 months)

Developed high-performance enterprise full-stack applications using Node.js and Java Spring Boot/Spring Cloud with secure microservices architecture for high-QPS distributed systems. Built frontend dashboards and reusable UI components with Angular/TypeScript, implemented Kafka/WebSocket-based real-time updates, and delivered CI/CD-enabled container deployments (Docker/Kubernetes) integrating Open

Java Spring Boot Spring Cloud TypeScript Kafka WebSockets Docker Kubernetes