Oleksii C.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 Nov 7, 2026.

General overview ● Java Developer with 8 years of professional experience. ● Professional experience highload services, measure performance, implement statistics dashboards, debug and fix slow segments. ● Strong technical experience in the development Rest API with Spring, design of new components, refactoring existing code, testing. ● Experience with microservice architecture implementation and designing applications from scratch. ● Actively participating in architecture discussions, proposing and implementing design patterns and solutions to address scalability, maintainability, and security challenges. Team and Project Management ● Mentor and coach team members to enhance technical skills, improve productivity, and promote a culture of continuous learning. ● Conduct code reviews, enforce coding standards, and implement best practices. ● Experience in SCRUM methodology, setup sprint goals for the team and achieving sprint goals. ● Collaborate with cross-functional teams, including product managers, quality assurance, and stakeholders. ● Jira adaptation for new development processes. Domain Expertise ● In the fintech domain, successfully integrated card payments, implemented transfers between IBAN accounts, and worked on currency exchanges between fiat and non-fiat currencies. ● In a medical application, I significantly enhanced security measures for authorization, successfully resolved drug price mismatches, and optimized import jobs. ● In a Big Data project, I led efforts to optimize the performance of TV rating calculations. ● For Internet Service Providers in the USA, I was involved in the design and successful implementation of price calculation logic. Feel free to contact me and I'll help you at any stage, from an idea or small app to a full-scale solution. My goal is to provide you with best solutions.