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Senior Software Engineer (React)

iyzico - Istanbul, Turkey - Hybrid - posted 2026-09-24

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iyzico is a fintech company founded in 2013 that provides online payment services and AI-based payment technologies to e-commerce businesses worldwide. Acquired by PayU in 2019, the company operates with a mission to democratize financial services and make them accessible to everyone. iyzico serves millions of consumers through its Buyer Protection program and blended payment solutions, enabling safe online shopping for users without traditional banking access. In this Senior Software Engineer role focused on React, you will develop scalable, high-volume, and reliable user-centric web and mobile applications that operate 24/7. You will engage directly with product managers, UX experts, and business stakeholders to analyze requirements, develop ideas, and design solutions. You will plan implementation and rollout of system changes that meet requirements for functionality, performance, scalability, and reliability. The role involves making independent technical design decisions, providing coding expertise and functional/technical support to team members, and encouraging engineering best practices across the team and department. The company offers a flexible working model called iyzico Homequarters with headquarters in Altunizade. Benefits include continuous development opportunities through conferences and in-house events, free access to online training platforms (Udemy, Harvard ManageMentor, Getabstract), an assigned onboarding mentor (iyzicoMate), a detailed orientation program, meal and internet allowance, transportation allowance, a tech/ergonomic workspace voucher, MacBook provision, private health insurance, employee support programs (psychological counseling, legal advice, financial advice), and one day of birthday leave. **Requirements:** - BSc degree in Computer Science or related field - Strong knowledge of data structures, algorithms, and software development principles - Demonstrated knowledge of all phases of the product lifecycle - Eagerness for quality and continuous improvement of processes - React Native and GraphQL knowledge (preferred) - Experience working with modern mobile standards and technologies to build fully responsive mobile apps - Experience in software engineering best practices for the full software development lifecycle, including agile development, coding standards, code reviews, build processes, testing, and maintenance - Good understanding of API services with which applications need to integrate - Strong understanding of UI/UX best practices and considerations - Can-do attitude and willingness to take ownership of problems

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