Senior Backend Engineer (PHP/Rust migration)

Hi there :) Thanks for checking in to find out about our open position. We´ll provide as much information as possible, but please feel free to reach us if you have further questions. We´ll be happy to see your application, even if there are skills you don't quite master! ABOUT US At South Geeks, we connect top LATAM engineering talent with innovative companies building impactful products worldwide. We focus on long-term partnerships, strong technical environments, and creating spaces where professionals can grow, contribute, and thrive. ABOUT THE CLIENT Our client is a financial technology company that provides secure payment and prepaid card solutions for public sector organizations. Their platform helps government agencies replace cash and paper checks with digital payment systems, enabling efficient and transparent distribution of funds. ABOUT THE ROLE We’re looking for a Senior Backend Engineer (PHP) to help maintain and evolve a mission-critical payments platform operating at the intersection of government systems and prepaid card processing. This role focuses heavily on backend development within a mature PHP-based platform that processes complex financial workflows. You will work with a long-lived codebase, contribute to weekly production releases, troubleshoot issues across distributed systems, and gradually help migrate portions of the system toward a Rust-based architecture. The environment requires engineers who enjoy understanding complex domains, improving legacy systems, and building reliable infrastructure for systems that must operate with high observability and recoverability. WHAT YOU NEED TO SUCCEED IN THIS ROLE - Senior-level experience developing backend systems in PHP, ideally within a LAMP-based architecture. - Strong experience working with MySQL and relational database design. - Experience maintaining and evolving large, long-lived codebases. - Solid understanding of Unix/Linux environments and server-based application development. - Experie