iPay.ua — a nationwide online payment and transfer service in Ukraine that allows users to pay for goods and services at over 2,000 merchants using payment cards.
We are one of the leaders in the online payments industry. Every day, we process over 76,000 payments, with more than 27 million transactions completed in 2025. Learn more about us, our mission, values, and goals on our site. Now we find a Senior / Team Lead Full-Stack Developer (PHP + React.js) to our team.
Requirements — Backend expertise: Strong experience with PHP 7/8 and the Laravel framework. — Frontend expertise: Hands-on experience with React.js, including Redux/RTK, React Query, hooks, component lifecycle, and modern frontend architecture (SPA, SSR/Next.js is a plus). — API skills: Proven track record in designing, developing, and integrating RESTful and/or GraphQL APIs. — Database knowledge: Proficiency in MySQL with strong skills in query optimization, indexing strategies, and handling large-scale datasets (10M+ records). — Architecture & OOP: Solid understanding of OOP, SOLID principles, design patterns, and clean code practices. — DevOps fundamentals: Practical experience with Git, CI/CD pipelines, Docker/Kubernetes (basic-to-intermediate level), and Nginx. — System experience: Proven background in high-load distributed applications, financial/payment systems, or other mission-critical platforms.
Nice to Have — Experience with cloud platforms (AWS, GCP, or Azure). — Familiarity with reporting and analytics systems, Data Lake solutions (Iceberg or equivalent, Pandas, Trino, DuckDB, etc.). — Knowledge of security and compliance standards (PCI DSS, GDPR, OWASP). — Experience in team leadership, including mentoring engineers, conducting code reviews, and making architecture decisions.
Responsibilities — Technical leadership: Lead the design and development of scalable backend services and modern React.js applications. — System ownership: Take end-to-end responsibility for critical modules, ensuring performance, scalability, and security. — Mentorship: Support and develop the engineering team through coaching, knowledge sharing, and structured code reviews. — Integration: Collaborate with internal teams and external partners (banks, payment providers, ERP vendors) to deliver seamless integrations. — Continuous improvement: Enhance APIs, optimize database performance, strengthen infrastructure resilience, and uphold coding standards. — Client support (escalation level): Serve as the technical escalation point for complex integration and production issues
