[Remote] Mobile Engineer

Note: The job is a remote job and is open to candidates in USA. Fireblocks is a leading platform for digital assets, providing secure solutions for financial institutions and brands. The Mobile Engineer will design and implement high-quality native mobile SDKs, ensuring seamless integration of wallet functionalities into applications while maintaining a strong focus on performance and reliability.ResponsibilitiesDesign 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 reliabilityOwn SDK features end-to-end: from API design and architecture, through implementation and testing, to release, versioning, and developer documentationBuild and maintain secure, reliable SDK components for wallet operations, including cryptographic operations, blockchain interactions, and security-sensitive flowsDefine and evolve the SDK architecture to support long-term maintainability, backward compatibility, and adoption across diverse customer applicationsBuild sample applications and demos that showcase SDK capabilities and serve as integration references for customersCreate clear, comprehensive SDK documentation and integration guidesWork with developer relations and support teams to address customer integration challengesRaise the bar for quality and operational excellence by establishing best practices around testing, observability, releases, and code healthContribute to a culture of ownership and execution, leading by example through hands-on work, code reviews, documentation, and knowledge sharingSkills5+ years of software engineering experience, with deep focus on mobile development and shipping production-grade SDKsDemonstrated track record of building and shipping high-quality code, with work you can point to and discuss in depthStrong hands-on experience with iOS (Swift) and/or Android (Kotlin); experience with React Native or other cross-platform frameworks, and familiarity with allExperience building mobile SDKs or shared libraries, including API design, versioning, packaging, and long-term maintenance across platformsExperience with blockchain-enabled mobile systems, including wallet flows, signing, and on-chain interactionsExperience working on security-sensitive mobile software, such as key management, secure storage, cryptography, or financial productsStrong grasp of mobile engineering best practices, including CI/CD, automated testing, release management, and observabilityA get-things-done mindset with the ability to independently own problems and deliver end-to-end solutionsComfortable making long-term architectural decisions while remaining pragmatic and adaptableB.Sc. in Computer Science / Engineering or equivalent practical experienceRemote role in a distributed team; preference for candidates in the Americas time zoneRust and/or WebAssembly (Wasm) experience, particularly building cross-platform SDKs consumed by mobile appsExperience designing shared core logic used across iOS and AndroidExperience with advanced mobile security primitives (secure hardware, MPC, low-level crypto)Prior experience owning or founding a mobile platform or SDK from scratchCompany OverviewFireblocks is a blockchain security service provider for moving, storing, and issuing digital assets. It was founded in 2018, and is headquartered in New York, New York, USA, with a workforce of 501-1000 employees. Its website is https://www.fireblocks.com.Company H1B SponsorshipFireblocks has a track record of offering H1B sponsorships, with 2 in 2026, 4 in 2025, 1 in 2024, 4 in 2023, 3 in 2022. Please note that this does not guarantee sponsorship for this specific role.