Nizetech

Mobile App Developer

Hazcentro • Freiberufler

Aug 2025 - Feb 2026 • 6 mos

Built and successfully deployed Hazcentro, an all-in-one mobile platform that simplifies everyday living by combining in-house eCommerce with on-demand skilled services. Led the end-to-end development using Flutter, delivering a scalable, high-performance cross-platform application with a clean, pixel-perfect user interface. Integrated multiple API services to enable seamless product browsing, service booking, and real-time operations across the platform. Managed the full deployment process to both Google Play Store and Apple App Store, ensuring compliance, performance optimization, and a smooth release cycle.

Mobile App Development

JostPay • Freiberufler

Jun 2025 - Aug 2025 • 2 mos

Led end-to-end development of a production-grade fintech platform, handling architecture, implementation, and deployment. Engineered a scalable and maintainable codebase using clean architecture and best practices. Integrated multiple payment services and APIs, ensuring reliability and secure transaction flows. Developed user-centric features that improved engagement through rewards and promotional systems. Optimized app performance and ensured smooth user experience across diverse device conditions.

Mobile Development

EverTry — Virtual Cards for Global Payments • Teilzeit

Jul 2024 - Sep 2024 • 2 mos

Played a key role in building a scalable virtual card platform supporting global payments and digital subscriptions. Implemented secure and efficient mobile interfaces for card issuance, management, and transaction tracking. Enhanced performance and usability, contributing to a fast, reliable, and user-friendly payment experience.