This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Staff Software Engineer, Backend based in United States. This is a high-impact engineering role focused on building the backend infrastructure that enables AI applications and modern software products to connect with external services. You will design and scale APIs, services, databases, and core platform systems while maintaining a strong focus on performance, reliability, and developer experience. As a Staff-level engineer, you will have significant ownership over technical direction, product decisions, and the evolution of critical systems. You will work closely with developer customers to understand integration challenges and translate their needs into scalable product solutions. The role also offers the opportunity to contribute to open-source projects and influence engineering practices across the broader developer community. You will operate in a highly autonomous, remote-first environment where engineers play a direct role in shaping both product strategy and execution. This opportunity is ideal for a seasoned backend engineer who combines deep technical expertise with product thinking, strong ownership, and genuine empathy for developers.