About Crossmint

Stablecoins 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 MoneyGram 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!

Location

Spain or USA

Type of employment

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

Compensation

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

About The Role

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.

About you

To thrive in this role, you should possess the following qualifications:

• Professional Experience: 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 Communication Skills: Demonstrate excellent written and spoken English.
• Educational Background: Hold a Bachelor’s degree in Computer Science or a related field, or equivalent knowledge and skills with industry experience.
• Programming Expertise: Expert knowledge in Java and/or Kotlin.

Bonus Points

We highly value candidates with the following experiences:

• Experience with blockchain or Web3 technologies is a plus, particularly in relation 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.

If you are passionate about what we’re building, and possess the skills and experience outlined above, we invite you to join us in our mission at Crossmint.

Our Principles

• 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.

Talent research indicates that women are often less inclined than men to apply for a role unless they have experience in 100% of the listed skills. However, this list is only a guide. We welcome your application even if you feel you meet around 75% of the requirements. At Crossmint, we believe skills can be learned, and diversity makes us stronger.

We work to foster a respectful environment where each person can be their authentic self, free from harassment, racism, and any form of discrimination. We proudly uphold our commitment to diversity and inclusion as an equal opportunity employer, and this policy applies to all employment practices within our organization.

Please note that Crossmint never conducts AI-based interviews, and all of our processes include an initial video call with a team member. Crossmint will not request your personal identification documents or any payment at any point during your interview process. Please stay vigilant about potential fraud. If you receive an email that claims to be from Crossmint but ends with any domain other than @crossmint.com, @crossmint.io or @paella.dev, it is not from us. We own these three domains listed before, and they are the only legitimate ones.

Please let our Talent Team know if you need any assistance completing any forms, or participating in the process.

Follow us on Linkedin and Twitter to keep updated with our latest activity! 👣