Open to opportunities

Harry User

@harryshih

Message

I build high-concurrency backend platforms for payments, games, and real-time data streams.

Taiwan

Message

What I'm looking for

I'm looking to build reliable, high-concurrency backend systems where I can own services end-to-end, solve performance and scalability challenges, and work with event-driven architectures, payments, real-time data, or game platforms.

I've built payment gateways, cryptocurrency payment systems, game servers, and real-time data platforms at Heliostecs, Photon Future, and 97 Technology. My work spans Java and Golang services, event-driven architectures, transaction pipelines, and production systems designed for reliability and scale.

At Heliostecs, I resolved Akka deadlocks and reduced production servers from seven to four while maintaining stability, and optimized big-data queries to cut CPU utilization from 25% to 5%. I take services from design through production using Clean Architecture, SDD, automated testing, and practical performance optimization.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Heliostecs

Mar 2026 - Present (5 months)

Architecting and developing a high-throughput real-time data platform to handle large-scale streaming data with low latency. Resolved high-concurrency deadlock issues in the Akka framework, enabling a reduction of production servers from 7 to 4 while maintaining system stability.

Java Spring Boot Akka Apache Flink Kafka Clickhouse Redis Apache Superset