Senior Backend / Full-Stack Engineer

I am a senior full-stack engineer based in Taipei, Taiwan, with experience across IT security, blockchain, gaming, and climate-tech SaaS. I have built identity and authentication products from the ground up and enjoy working on systems that require strong reliability, security, and performance.

I helped ship ATKey.Login and AuthFi on the W3C WebAuthn standard, where I worked on core cryptographic and authentication flows. I also delivered on-prem and SaaS versions of these products for multiple clients, scaling them to support high concurrency and secure enterprise use cases.

At SenecaESG, I architected and improved a multi-product platform covering ESG disclosure, emissions accounting, and portfolio ESG scoring. My work focused on Spring Boot microservices, polyglot persistence, async processing, observability, and security hardening.

I am especially strong in backend engineering, protocol implementation, performance optimization, and refactoring legacy systems into cleaner modular architectures. I have repeatedly improved system throughput, reduced infrastructure costs, and eliminated bottlenecks such as N+1 query patterns and oversized data models.

My technical background includes Java, Python, JavaScript/Node.js, SQL, Spring Boot, Hibernate, PostgreSQL, Redis, MongoDB, Elasticsearch, Docker, Kubernetes, Azure AKS, Kafka, RabbitMQ, GitHub Actions, Jenkins, and related DevOps and testing practices. I also have experience with OAuth2/OIDC, JWT, Keycloak, PKI, and WebAuthn.

I am fluent in Mandarin and advanced in English, and I hold a B.S. in Electrical Engineering from National Taiwan University of Science and Technology. I am looking for challenging backend or full-stack engineering opportunities where I can contribute to secure, scalable, and high-performance products.