Backend & Systems Engineer with 8+ years of experience specializing in the "engine" of high-performance applications. My expertise lies in reverse engineering undocumented systems, building robust backend architectures, secure API integrations, and automating complex workflows including financial systems. In recent work, I've moved beyond standard web development into deep Systems Engineering — a prime example being a Southeast Asia and USA banking prototype, where I used Node.js and Golang to handle secure transaction logic and high-throughput API communication. I specialize in Legacy System Modernization through Reverse Engineering and Process Automation — creating modern API wrappers for undocumented protocols to ensure seamless system interoperability. I prefer async, written communication and work best with clients who value clear documentation and structured updates over constant calls. I actively use AI tools in my workflow to accelerate development, debugging, and system analysis. Open to discussing complex backend challenges, system design, or automation engineering projects. Daily stack: TypeScript, Go, C