Oleh is a Senior Software Engineer with more than a decade of experience building web applications, backend systems, and cloud-based platforms. Most recently, he served as Senior Full Stack Engineer at HTC Global Services, where he developed scalable applications for financial services, healthcare, and public sector clients serving more than one million users across North America and the Middle East. His work there included modernizing legacy systems into modern React, Next.js, and TypeScript applications on AWS, and optimizing microservices that connected with enterprise platforms such as SAP and Oracle. Oleh specializes in JavaScript, TypeScript, Python, React, and Next.js, with deep experience in API design, databases, and cloud infrastructure. He focuses on writing clear, maintainable code and making practical architectural decisions that turn business goals into reliable software.