demon King

I’m a Backend Engineer who builds production-minded systems with Java and Spring Boot, focusing on secure APIs (Spring Security, JWT) and scalable architectures. I’ve implemented distributed microservices with Kafka for async decoupling, PostgreSQL for clean data boundaries, and Elasticsearch for fast, filterable search.

From shipping a 7-service distributed LinkedIn clone (Eureka discovery, API Gateway routing, and Kubernetes-ready deployments) to delivering a blockchain-secured recruitment system that anchors tamper-proof evidence on Polygon using Web3j, I care deeply about reliability and correctness. I’ve also built Stripe-integrated hotel booking flows with robust webhook handling and developed an Elasticsearch engine with fuzzy search and real-time autocomplete.