Kostya S.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Apr 7, 2026.

👋 Hi! I'm a passionate software engineer with over 10 years of experience turning complex ideas into real, working solutions. I specialize in building reliable software, analyzing systems at the binary level, and solving tough technical problems with a clear, practical approach. 💻 Core Skills ✔️ Software Development • C++, C#, Python — high-performance tools, system utilities, and automation • Java/Kotlin — scalable backend services and cross-platform logic ✔️ Reverse Engineering & Security • Malware analysis, vulnerability research, and binary patching (IDA Pro, Ghidra, x64dbg) • Dynamic debugging & instrumentation (Frida, Cheat Engine) • Legacy system recovery & modernization via disassembly ✔️ Web & Mobile Development • Full-stack web apps with React, Node.js, MongoDB • Native Android/iOS apps & cross-platform builds using Unity ✅ Why Clients Choose Me 🎯 Precision Focus — I dig deep into complex systems, clean up legacy code, and create secure, efficient software. 🗣 Clear Communication — I provide regular updates, honest timelines, and explain things without tech jargon. 📈 Proven Results — 50+ successful projects: automation tools, enterprise platforms, control systems, dashboards, and more. 🤝 Let’s Collaborate! If you're looking for someone who combines deep technical skills with a practical, human approach — feel free to reach out. I'm excited to help you bring your ideas to life and build something that truly works.