Vasyl S.

Senior Full-Stack Developer • Performance Optimization Expert 🚀 Looking for business partners, not just freelance projects. If you have a software idea, product concept, or business problem — you bring the idea/domain expertise, I bring 20+ years of software engineering and build the product. I’m interested in long-term partnerships where we share the business upside, rather than simply working for an hourly rate. For the right idea, I’m open to co-founder / technical partner arrangements, revenue share, or equity-based collaboration. --- I help companies make their software faster, lighter, and more efficient. 20+ years of hands-on experience in system performance tuning, profiling, solving bottlenecks, and refactoring legacy systems. If your application is slow, unstable, memory-hungry, or needs deep analysis — I can fix it. 🧩 My Core Expertise • Performance optimization (Java/JVM, databases, backend services) • Query optimization, memory leak detection, code profiling • Refactoring legacy code, stabilizing old systems • Full-stack development (Java/Kotlin + JS, Python, PHP, Perl, C++) • Web automation & scraping • Systems analysis, debugging, complex issue resolution 🚀 What I Deliver • Faster request processing • Reduced memory & CPU usage • Significantly improved database performance • Clean, maintainable, well-structured code 🤝 Availability Open to long-term or part-time collaboration (30–40 h/week). Also interested in innovative startups and software products where your idea + my implementation can become a real business. Let’s build something valuable.