Staff Software Engineer, Backend

An Introduction to Primer Primer is the world's first unified payment infrastructure, founded by former leaders of Braintree and PayPal. We unify fragmented payment and finance systems into a single, intelligent platform, automating the entire payments lifecycle from acceptance and orchestration to reconciliation, FX, and financial operations. Trusted by leading merchants worldwide, we give finance, payments, and engineering teams the tools to move faster, reduce complexity, and unlock growth. Our open, modular platform connects to 150+ services across the payments ecosystem, while our expanding CFO product suite brings unified reconciliation, FX management, and financial visibility across markets and currencies. Backed by Accel, Balderton, ICONIQ, and Tencent, we're setting a new standard for how the world moves money. #### What will you be doing? - Setting and driving the technical strategy across the Partners engineering teams, from architecture decisions through to hands-on implementation - Owning the design of core backend services for high-performance distributed systems, with scale and reliability as non-negotiables - Acting as the technical authority on partner integrations — shaping how third-party PSPs connect with Primer's platform and raising the bar on what "seamless" actually means - Leading and influencing engineers across teams without direct authority — through code, design reviews, and technical mentorship - Spotting and resolving cross-team technical dependencies before they become blockers - Driving adoption of modern engineering practices (BDD, TDD, rigorous documentation) and holding the line on quality - Partnering closely with Product to shape roadmap decisions where the technical constraints or opportunities are material