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Cloudflare is seeking a Senior Software Engineer to join the WARP Mobile SDK team and help build the future of mobile security SDKs. In this role, you will define client architecture and public APIs for native iOS and Android SDKs, working from deep expertise in at least one of those ecosystems. You will establish foundations that are testable, well-documented, lightweight, and straightforward for customer engineering teams to integrate and operate.
As a senior software engineer, you will set standards for compatibility, diagnostics, performance, and release quality across mobile platforms. You will work closely with product and engineering partners to turn security problems into dependable developer products, mentor native mobile engineers, and help resolve complex customer integration issues. You will be successful in this role if you combine strong native engineering judgment and a track record of carrying distributed software from design through production operation.
Cloudflare runs one of the world's largest networks that powers millions of websites and Internet properties for customers ranging from individual bloggers to SMBs to Fortune 500 companies. The company protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code.
**Requirements:**
- Deep experience building production software for either iOS with Swift or Android with Kotlin, with enough familiarity with the other ecosystem to guide shared architectural decisions
- Experience designing or owning customer-distributed SDKs, libraries, or similarly constrained developer-facing products
- Experience with mobile platform security concepts, including app and device integrity, secure key storage, application signing, authentication, and secure communications
- Familiarity with native mobile networking stacks, HTTP APIs, and integration challenges introduced by different application architectures and networking libraries
- Experience diagnosing production issues that cross application, SDK, network, and service boundaries, while designing safe diagnostics that do not expose sensitive data
- Understanding of mobile package distribution, source and binary compatibility, dependency management, and reliable release practices
- Experience writing technical designs and aligning decisions across product, client, backend, edge, and security teams
- Experience mentoring engineers and raising a team's technical bar through design review, code review, and knowledge sharing
- Empathetic, proactive, and constructive written and verbal communication skills
- Proven ability to operate within strict mobile performance budgets, including binary size, battery use, startup time, and main-thread overhead
**Bonus:**
- Familiarity with how native SDKs are consumed by cross-platform frameworks such as React Native and Flutter
- Familiarity with lower-level languages like C++ or Rust for high-performance, cross-platform security modules
