Senior Backend Engineer – App SDK & Server-Driven UX

The Role We are seeking a Senior Backend Engineer to partner closely with our App SDK team, focusing on backend systems that enable server-driven UX and client configuration at scale. This role sits at the intersection of backend engineering, mobile platforms, and product experience, helping us ship flexible, dynamic experiences across multiple client applications. You will design and build backend services that power SDKs, enable experimentation, and allow product teams to evolve app experiences without requiring frequent client releases. What Youll Do • Design, develop, test, document, and deploy backend services that support mobile and app SDKs • Build systems that enable server-driven UX, feature configuration, and dynamic content delivery • Partner closely with SDK, mobile, and frontend teams to define API contracts and data models that scale across platforms • Translate product and UX requirements into backend-driven configurations and workflows • Lead the technical development of new capabilities from requirements through production rollout • Contribute to architecture decisions around versioning, backward compatibility, and client resilience • Help define engineering best practices for API design, schema evolution, and SDK support • Participate in on-call rotations and help troubleshoot production issues impacting client applications • Improve observability, testability, and operational metrics for SDK-facing services • Participate in code reviews, design discussions, and team planning • Mentor engineers and help grow backend expertise around SDK and server-driven design patterns • Be open to occasional travel to Fanatics offices, conferences, and team events What Were Looking For • 3+ years of experience building scalable backend services in production environments • Strong experience with Go (Golang) as a primary development language • Experience designing APIs consumed by mobile apps, web clients, or SDKs • Familiarity with server-driven UX, remote configuration, feature flags, or experimentation systems (strong plus) • Experience working closely with mobile or client platform teams (iOS, Android, Web, or SDKs) • Strong understanding of API versioning, backward compatibility, and client safety • Agile/SCRUM experience and comfort working in fast-moving environments • Excellent communication skills and ability to collaborate across product, design, and engineering teams If you bring backend strength and interest in SDKs or server-driven experiences — even without deep prior exposure — wed still love to hear from you. The salary range for this position is $152,000 to $200,000, which represents base pay only and does not include short-term or long-term incentive compensation. When determining base pay, as part of a final compensation package, we consider several factors such as location, experience, qualifications, and training. Apply tot his job