Android Engineer - SDKs Spain

Android Engineer - SDKs (Contract - Spain or US)

If you are interested, please apply here.

Stable coins and blockchains are upgrading the world’s financial system — and Crossmint lets companies harness their power with ease.

Crossmint is a one-stop-shop developer platform for building modern financial applications, from the next generation of fintechs to applications that leverage AI agent–driven commerce.

With just a few lines of code, developers can integrate programmable wallets, stablecoin payments, tokenization, on/off ramps, compliance, and agentic commerce tools — all from a single vendor, without the need for a large team of blockchain engineers.

From companies like Money Gram and Visa to entire nation states, our more than 40,000 clients use Crossmint to launch new financial products, tokenize assets, and build applications for agentic commerce — all on fully managed infrastructure across 50+ chains.

If you want to help build the backbone of programmable finance and agentic systems, we’d love to work with you!

Spain or USA

Contract (2 months - Renewable). 20h-40h per week.

Per-hour setting for the contract duration, but open to project completion-based compensation.

• As an Android SDK Engineer at Crossmint, you will be responsible for designing and architecting mobile SDKs from the ground up.
• Building SDKs for core features such as authentication, smart wallets, and payments.
• Collaborating with cross-functional teams to understand the business needs and translate them into mobile SDK solutions.
• Documenting your architecture and design choices clearly and concisely.
• Owning your projects end to end: from initial concept through to deployment and support.
• Mentoring other team members as we grow the mobile engineering team.

• 5+ years of experience in Android development, with at least 1+ year specifically in mobile SDK development (not just mobile app development) in Java or Kotlin.
• Excellent written and spoken English.
• Hold a Bachelor’s degree in Computer Science or a related field, or equivalent knowledge and skills with industry experience.
• Expert knowledge in Java and/or Kotlin.

• Experience with blockchain or Web3 technologies, particularly related to wallets or payment systems.
• Provable experience shipping high quality code.
• Experience working on a team and references to back it.
• React Native or Flutter experience is nice to have.

• Results and delivery:
  Ship high quality work fast.
• Build for the long term:
  Build scalable, secure, and reliable solutions. Use AI.
• Extreme Ownership:
  Be an effective Directly Responsible Individual (DRI). Be proactive.
• Be a team player:
  Be an effective and kind colleague providing credible challenge. Be present and reliable.

Crossmint is an equal opportunity employer. We value diversity and inclusion and do not discriminate on any protected characteristic. All employment practices are in compliance with applicable laws.