Senior Backend Engineer (PHP/Rust migration)

South Geeks•Wyoming, NY

2d•Remote

About The Position

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.

Requirements

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.
Experience debugging production systems and investigating complex data or processing issues.
Familiarity with automated testing practices and maintaining large test suites.
Experience working with message queues, logging systems, or asynchronous processing.
Ability to work independently while collaborating through code reviews and technical discussions.
Strong analytical skills and ability to learn complex technical and business domains.

Nice To Haves

Experience with Rust or interest in learning it as part of a gradual system migration.
Experience working with financial systems, payments, or fintech platforms.
Some JavaScript experience for occasional frontend tasks.
Experience using AI-assisted coding tools.

Responsibilities

Develop and maintain backend functionality in a PHP-based payment processing platform.
Contribute to the gradual migration of selected systems from PHP to Rust.
Troubleshoot production issues and perform data investigations when needed.
Participate in weekly production releases and help maintain stable deployment cycles.
Review code and collaborate with engineers to maintain code quality.
Support and evolve system observability through logging, monitoring, and debugging tools.
Work closely with the team to understand and maintain complex payment workflows tied to government systems.