Lion Kozlinsky

ocused and efficient engineering leader with 15+ years of experience building and leading development of high-load backend systems, fintech platforms, and payment infrastructure. My experience includes distributed systems, backend platform architecture, payment services, legacy modernization, and leading engineering teams through complex business-critical deliveries. Over the years, I’ve worked directly with executives and business stakeholders, helping turn product and operational challenges into scalable production systems. I lead from the front — combining hands-on engineering, pragmatic architectural decision-making, and alignment between technical execution and business priorities. Key achievements: • Leading development of a complete loan software platform delivered to production within one year • Extracting a critical payment service from an unsupported monolith into a stable standalone production system • Designing and modernizing high-load systems that directly improved operational stability and business outcomes • Building and mentoring engineering teams focused on accountability, transparency, and execution Core expertise: Distributed Systems • FinTech • Payment Systems • Backend Architecture • System Design • Symfony • Laravel • Python • Microservices • DDD • CQRS • Event-Driven Architecture • Legacy Modernization Currently expanding into AI-enabled backend engineering, including LLM-powered systems, RAG architectures, and business process automation. If you’re looking for an engineer with both excellent technical expertise and strong leadership abilities to deliver measurable results, feel free to contact me at ogionw@gmail.com. Let's discuss how I can contribute to your company’s success.