Senior Backend Engineer - SDK

Fanatics

9d•$152,000 - $200,000

About The Position

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.

Requirements

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
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

Nice To Haves

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)
If you bring backend strength and interest in SDKs or server-driven experiences — even without deep prior exposure — we'd still love to hear from you.

Responsibilities

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