Andrew Marcelino — Mobile Development freelancer in Jakarta

PT Bank Central Asia Tbk (BCA) Tangerang, Banten

● Developing and scaling features for a large-scale fintech Android application serving millions of users. ● Delivering 10+ end-to-end features across payments, financial services, and personalization domains. ● Contributing to high-impact product enhancements that increased user engagement and transaction frequency (based on internal metrics). ● Migrating legacy codebase to modern Android stack (Jetpack Compose), improving maintainability and UI consistency. ● Improving app stability by proactively identifying and resolving ANR and crash issues in production. ● Implementing unit tests to reduce regression risk and improve overall code reliability. ● Optimizing performance of critical user flows, enhancing responsiveness and user experience.

Onetwocode Indonesia Jakarta, Indonesia

● Delivered 3+ end-to-end applications across mobile, web, and backend systems as core contributor. ● Built mobile applications using Flutter, focusing on performance and maintainable architecture. ● Developed web applications using JavaScript and Bootstrap, ensuring responsive and user-friendly interfaces. ● Designed and implemented backend services using PHP and MySQL. ● Refactored and improved existing systems to enhance performance and code maintainability.

PT.Enseval Putera Megatrading Tbk Jakarta, Indonesia

● Built and delivered an internal HR mobile application using Flutter, improving efficiency of employee evaluation processes. ● Designed and implemented backend integration using C# and MSSQL. ● Managed full development lifecycle, from requirements to deployment. ● Maintained system reliability and supported ongoing HR operations.