Mobile Engineer

Fireblocks is a company that provides secure solutions for digital assets and blockchain. The Mobile Engineer will design and implement native mobile SDKs for integrating wallet functionality into applications, ensuring high quality and security standards.

Responsibilities:

• Design and implement high-quality native mobile SDKs that enable developers to integrate embedded wallet functionality into their applications, with a strong focus on API ergonomics, performance, and reliability
• Own SDK features end-to-end: from API design and architecture, through implementation and testing, to release, versioning, and developer documentation
• Build and maintain secure, reliable SDK components for wallet operations, including cryptographic operations, blockchain interactions, and security-sensitive flows
• Define and evolve the SDK architecture to support long-term maintainability, backward compatibility, and adoption across diverse customer applications
• Build sample applications and demos that showcase SDK capabilities and serve as integration references for customers
• Create clear, comprehensive SDK documentation and integration guides
• Work with developer relations and support teams to address customer integration challenges
• Raise the bar for quality and operational excellence by establishing best practices around testing, observability, releases, and code health
• Contribute to a culture of ownership and execution, leading by example through hands-on work, code reviews, documentation, and knowledge sharing

Requirements:

• 5+ years of software engineering experience, with deep focus on mobile development and shipping production-grade SDKs
• 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); experience with React Native or other cross-platform frameworks, and familiarity with all
• Experience building mobile SDKs or shared libraries, including API design, versioning, packaging, and long-term maintenance across platforms
• Experience with blockchain-enabled mobile systems, including wallet flows, signing, and on-chain interactions
• Experience working on security-sensitive mobile software, such as key management, secure storage, cryptography, or financial products
• Strong grasp of mobile engineering best practices, including CI/CD, automated testing, release management, and observability
• A get-things-done mindset with the ability to independently own problems and deliver end-to-end solutions
• Comfortable making long-term architectural decisions while remaining pragmatic and adaptable
• B.Sc. in Computer Science / Engineering or equivalent practical experience
• Remote role in a distributed team; preference for candidates in the Americas time zone
• Rust and/or WebAssembly (Wasm) experience, particularly building cross-platform SDKs consumed by mobile apps
• Experience designing shared core logic used across iOS and Android
• Experience with advanced mobile security primitives (secure hardware, MPC, low-level crypto)
• Prior experience owning or founding a mobile platform or SDK from scratch