- Launched a talent platform connecting people, employers, and universities, with 20K+ MAU, 1,500 registered companies, and 30 universities- Implemented Scrum and led a 10+ team, reducing estimation error by 45% and achieving a consistent 3-week time to market- Balanced leadership with hands-on development (50%) in C# / .NET, Python, React, as well as DevOps, and technical writing- Architected a scalable system with 30 microservices- Oversaw cybersecurity, earning Cyber Essentials Plus certifications annually- Designed an API for internal teams and contractors- Administered GCP (100+ Docker containers, 99.98% uptime)

- Developed an online management system in .NET for a 1,000+ minibus fleet, along with an Android driver’s app in Kotlin for ticket sales and GPS sharing- Created 10+ open-source projects: smsQ (SMS-to-Telegram app with 5,000+ users in Kotlin and Go), Boxt (email-in-Telegram app in Go), TreeMap (a red-black tree-based map in Go), and more projects in Python, Go, and C++- Built a personal cryptocurrency algotrading system in Go

- Worked as key engineer of WPF-based management software for 100+ US beauty salon networks, improving operations and customer experience- Developed 4 self-service WPF kiosk apps for beauty salon clients, including SportClips (2K branches), leading to a decade-long partnership

- Built a UWP C# mobile app for a fitness tracker platform (500K+ MAU)- Implemented social features for this app

- Connected 5 IP camera protocols using self-written C++ DirectX drivers in a computer vision-powered surveillance system

- Integrated 16 exchanges into the CQG data feed using C++ microservices, achieving sub-100 microsecond latency in co-located environments

- Developed C/C++ SCSI, FC and USB virtual disk drivers for NAS software on macOS