Mobile Engineer – Build Secure SDKs (Remote)

About the role

Fireblocks' Dynamic team is looking for a senior Mobile Engineer to design and ship production‑grade SDKs that enable developers to embed wallet functionality directly into their apps. You will work remotely with a distributed team focused on security, performance, and developer experience.

Key responsibilities

• Design and implement high‑quality native mobile SDKs for iOS and Android, emphasizing API ergonomics, performance, and reliability.
• Own SDK features end‑to‑end, from architecture and implementation to testing, release, versioning, and documentation.
• Build and maintain secure components for cryptographic operations, blockchain interactions, and other security‑sensitive flows.
• Create sample applications, demos, and comprehensive integration guides for customers.
• Collaborate with developer relations and support teams to resolve integration challenges and improve SDK quality.

Required profile

• 5+ years of software engineering experience with a strong focus on mobile development and shipping production‑grade SDKs.
• Proven track record of delivering high‑quality code that can be discussed in depth.
• Experience building security‑sensitive mobile software such as key management, secure storage, or financial products.
• Ability to make long‑term architectural decisions while remaining pragmatic and adaptable.

Required skills

• iOS development with Swift
• Android development with Kotlin
• React Native or other cross‑platform frameworks
• Rust and/or WebAssembly for shared core logic
• Blockchain integration, wallet flows, and cryptographic primitives
• CI/CD pipelines, automated testing, release management, and observability