Mustapha G

Senior Full-Stack & Mobile Developer

Upwork • Vollzeit

Jun 2017 - Present • 9 yrs 1 mo

• Designed and developed custom web and mobile applications across diverse industries (e-commerce, e-health, transportation, food & beverage, social networking, energy, events) • Architected secure REST APIs with JWT and OAuth 2.0, and integrated third-party APIs and cloud services • Managed application deployment and maintenance across platforms (Google Play, App Store, Linux, Nginx, Docker) • Gathered client requirements, wrote technical specifications, and proposed architectures suited to business and budget constraints • Independently managed the full project lifecycle: estimation, planning, development, delivery, and post-production support • Maintained direct client relationships with regular reporting and iterative deliveries in an agile workflow • Optimized application performance (load times, scalability, Core Web Vitals) and ensured data security • Set up CI/CD pipelines and version control best practices (Git, GitHub Actions) to ensure consistent delivery quality • Delivered 20+ end-to-end client projects spanning diverse business domains and modern tech stacks