Staff Software Engineer

Overview This is a full-time, U.S.-based senior engineering role focused on modernizing an enterprise-grade SaaS platform that powers the financial and operational backbone of large, multi-location field service organizations. The system supports complex billing, accounting, compliance, and data integrations for organizations operating across dozens or hundreds of locations, and runs continuously in production. What You Will Be Doing You’ll be responsible for evolving a mission-critical platform without interrupting live enterprise operations, consolidating a diverse technology stack, and enabling faster customer onboarding and deployment. This is a highly technical role for an experienced engineer who enjoys untangling legacy systems, defining modernization strategy, and leading by example in a small, high-leverage team. Responsibilities 40% Backend and platform modernization (Go, Node, PHP) 35% Frontend consolidation and UI modernization (React/Vue) 25% Architecture, migration planning, and technical leadership Qualifications Required Skills & Experience 8+ years of experience building and maintaining production software in complex domains Proven ownership of system architecture across multiple engineers and long-lived codebases Strong experience with React and/or Vue for frontend development Backend experience with Go and/or Node.js, building shared services and APIs Hands-on experience working in legacy codebases, including PHP and lower-level languages Ability to analyze deeply embedded business logic and plan incremental refactors safely Strong written communication skills, including technical design docs, ADRs, and migration plans Deep familiarity with AI-native development workflows, used as a core productivity multiplier Ability to work independently as the most senior engineer on a small team Desired Skills & Experience Experience supporting or leading cloud infrastructure migrations (AWS preferred) Exposure to C or systems-level programming Background in accounting, billing, ERP, or financial systems Experience with vertical SaaS or operational software Familiarity with strangler-pattern or layered modernization approaches Experience integrating with external APIs, including payments, government data, or vehicle services Prior ownership of platform consolidation or system unification efforts What You Will Be Doing Tech Breakdown 40% Backend and platform modernization (Go, Node, PHP) 35% Frontend consolidation and UI modernization (React/Vue) 25% Architecture, migration planning, and technical leadership Daily Responsibilities 65% Hands-on development and refactoring 20% Technical planning, documentation, and architecture ownership 15% Mentorship and cross-functional collaboration You’ll modernize an enterprise platform while it remains live, consolidating frontend and backend technologies into a more maintainable and scalable architecture. Day to day, you’ll analyze legacy PHP and C components, identify high-leverage refactoring targets, and introduce new service layers that integrate payments, compliance tooling, marketplace capabilities, and external data providers. You’ll also play a key role in reducing onboarding complexity, supporting a cloud migration, delivering new enterprise workflows, and raising the overall technical bar for the team. Benefits Bonus eligible Medical, Dental, and Vision Insurance Paid Vacation Time Equity / Stock Options Applicants must be currently authorized to work in the United States on a full-time basis now and in the future. Posted By: Grant Willoe #J-18808-Ljbffr Motion Recruitment