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Fireblocks is seeking a Senior Mobile Engineer to design and implement high-quality native mobile SDKs for Dynamic, their embedded wallet platform. You will own SDK features end-to-end—from API design and architecture through implementation, testing, release, and developer documentation. The role involves building secure, reliable SDK components for wallet operations including cryptographic operations, blockchain interactions, and security-sensitive flows. You'll define and evolve SDK architecture to support long-term maintainability, backward compatibility, and adoption across diverse customer applications. You'll also build sample applications and demos that showcase SDK capabilities, create comprehensive documentation and integration guides, and work with developer relations and support teams to address customer integration challenges. The position emphasizes raising the bar for quality and operational excellence by establishing best practices around testing, observability, releases, and code health. You'll contribute to a culture of ownership and execution through hands-on work, code reviews, documentation, and knowledge sharing.
You bring 5+ years of software engineering experience with deep focus on mobile development and shipping production-grade SDKs. You have demonstrated track record of building and shipping high-quality code with work you can point to and discuss in depth. Strong hands-on experience with iOS (Swift) and/or Android (Kotlin) is required, along with experience building mobile SDKs or shared libraries, including API design, versioning, packaging, and long-term maintenance across platforms. Experience with blockchain-enabled mobile systems (wallet flows, signing, on-chain interactions) and security-sensitive mobile software (key management, secure storage, cryptography, financial products) is essential. You possess strong grasp of mobile engineering best practices including CI/CD, automated testing, release management, and observability. A get-things-done mindset with ability to independently own problems and deliver end-to-end solutions is critical. You're comfortable making long-term architectural decisions while remaining pragmatic and adaptable. B.Sc. in Computer Science/Engineering or equivalent practical experience preferred. Remote role in distributed team with preference for Americas time zone candidates.
