Emil Zając

Built and maintained production-grade Flutter mobile applications for Android and iOS in live environments. Delivered and supported payment gateway and Soft POS integrations, including Viva Wallet, Worldline, and Zen payment flows. Supported payment-related operational processes across multiple markets with country-specific adaptations. Implemented SEO strategies to improve organic traffic and search rankings. Enhanced inventory management systems, reducing costs by 15% and improving operational efficiency. Launched targeted marketing campaigns to increase brand awareness and conversions.

Led development of key features that contributed to a 250% increase in user adoption. Refactored the app for improved code quality, performance, and long-term maintainability, resulting in improved test coverage from 24% to 85%. Proposed and implemented technical solutions with better performance and reduced maintenance costs. Performed deep code reviews, participated in Scrum meetings, and mentored junior developers in Flutter best practices.

Developed and optimized an e-commerce website, improving Google Speed Insights scores to 90%+ on mobile, resulting in faster load times and improved customer experience.