Tech Lead / Full-stack Engineer

OKKO is a leader in the fuel market and one of the largest companies in Ukraine with a powerful digital ecosystem, including filling stations, retail, B2B direction, logistics, financial services, and a large loyalty program. We are looking for a Tech Lead / Full-stack Engineer who combines strong engineering expertise with team leadership, actively participating in backend and frontend development.

• Active participation in backend (.NET / .Net Core) and frontend (React) development
• Technical leadership of the development team (3–8 engineers)
• Task decomposition, technical assessment, and planning work
• Conducting code reviews and ensuring code quality
• Implementation of architectural solutions developed together with the Solution Architect
• Monitoring compliance with architectural principles and standards
• Participation in the design of inter-service interaction
• Working with microservices and Event-Driven architecture
• Ensuring performance, scalability, and reliability of services
• Development of high-load services and transactional systems
• Analyzing and resolving technical issues, bottlenecks, and incidents
• Close cooperation with Solution Architect, DevOps, QA, and Business Analyst
• Participation in technical discussions, Refinement sessions, and planning roadmaps
• Improvement of development processes, CI/CD, and Deploying

• 5+ years of commercial development experience
• Experience in the role of Tech Lead or Senior Full-stack Engineer
• Practical experience in development on .NET / .Net Core and React
• Experience working with microservices and/or distributed architecture
• Experience with high-load and/or transactional systems is a plus
• Strong knowledge of OOP, SOLID, DRY, Clean Code, Clean Architecture
• REST API, inter-service communication, Event-Driven approaches
• Understanding the importance of writing Unit tests and ability to write testable code
• Experience with SQL and NoSQL databases
• Understanding of ACID/BASE
• Experience or understanding of DevOps practices (CI/CD, GitOps, Docker)
• Deep understanding of service security

• Working on large-scale RetailTech / FinTech projects
• Real impact on technical decisions and product quality
• Professional growth to Solution Architect or Engineering Manager roles
• Work in a strong engineering team
• Competitive salary, social package, and stable conditions