Java Web3 Jobs in United States

Who We Are

Solana is a high performance blockchain that can deliver a fast and friendly user experience, without sacrificing security.

At Solana Mobile, we are working to bring Solana and web3 to the palm of your hand on mobile. In 2023 we shipped the Saga phone with Seed Vault to secure Solana wallets with HW backed security and built the dApp Store as a developer friendly place to bring web3 apps to users. We also implement and provide the Solana Mobile Stack to developers to simplify building web3 dApps for mobile. In 2025 we continued this journey with the release of Seeker, which has shipped to 150k customers in 50+ countries.

Solana Labs, Inc. (“Solana Labs”) is a technology company that builds products, tools, and reference implementations that can be used on the Solana blockchain. Solana Mobile is a dedicated team within Solana Labs. We are a fully distributed team with offices in San Francisco and New York.

The Opportunity

We’re looking for a Senior System Software Engineer (Android) to lead the design and implementation of secure, cryptographically sound Android-based platforms for interacting with the Solana blockchain. You will have broad ownership of Android system-level components, collaborating across hardware abstraction layers, trusted execution environments, and the Android OS stack.

This is a unique opportunity to work at the intersection of Android system development, applied cryptography, and blockchain technology.

Key Responsibilities:

• Design and implement a secure cryptographic solution tailored for Android smartphones.
• Develop the UI layer for transaction authorization and signing on Solana.
• Create API interfaces to interact with blockchain software wallets.
• Build and maintain a system service responsible for transaction validation, key setup, and key management
• Work with partners to implement and maintain the Trusted App for secure key generation and signing.
• Collaborate with software and hardware partners and oversee their development deliverables.
• Integrate with the broader Solana Mobile Android application ecosystem.
• Design and build Android UI components, system services, and compliance test suites.
• Create and maintain automated test harnesses using Android Cuttlefish virtual devices.
• Take end-to-end ownership of Android system software activities: design, implementation, and integration.

Required Skills & Experience:

• Strong proficiency in C, C++, Java, and Kotlin.
• Deep understanding of Android architecture, especially system services and hardware abstraction layers (HALs).
• 2+ years of experience in Android system software development.
• 5+ years of total professional software engineering experience.
• Solid foundation in applied cryptography and Trusted Execution Environments (TEEs).
• Experience working with or integrating secure hardware and vendor SDKs.
• Ability to lead cross-functional development and integration efforts.

Nice to Have:

• Familiarity with Android Cuttlefish or similar virtual devices.
• Interest or experience in blockchain applications and ecosystem tools.
• Contributions to open-source Android or security-related projects.