Full-stack Engineer; Spain

Full-stack Engineer (Spain)

Full‑stack Engineer role in Crossmint located in Madrid or remote from Spain. Full‑time indefinite contract. 4‑7 years experience, more than 7 years also considered.

Crossmint is the leading enterprise‑grade stablecoin infrastructure enabling fintechs and enterprises to integrate stablecoin rails and smart wallets with speed, compliance, and scale. Trusted by more than 40,000 clients including Money Gram, WireX, Toku, and more. Crossmint provides embedded smart wallets, on/off‑ramps, cross‑chain stablecoin orchestration, token checkout, and other blockchain primitives through simple, developer‑friendly APIs, no blockchain engineers required. Backed by Ribbit Capital, Franklin Templeton, and other top investors.

The future of finance is crypto‑native. Crossmint makes it easy to get there.

Madrid (Gran Vía) office, open to a fully remote setting from Spain.

Full‑time, indefinite contract.

4‑7 years of experience, open to candidates with more than 7 years.

As a Full‑stack Engineer at Crossmint, you will help build and maintain core systems that power our products and customer experiences. You will work across the stack to deliver reliable, scalable, and secure solutions that support critical business and financial workflows.

• Write high‑quality code that is correct, secure, performant, and maintainable.
• Design and build backend and frontend systems, contributing to APIs, services, and user‑facing applications.
• Develop and maintain financial and transactional workflows including subscriptions, payments, and usage‑based systems.
• Ensure data integrity and reliability by design and maintenance of systems that accurately track transactions, balances, and usage.
• Collaborate on system architecture by writing and reviewing architectural and design documentation with the team.
• Own projects end to end from initial design to production deployment and iteration.
• Participate in on‑call rotations taking part in paid on‑call shifts once or twice per quarter.
• Mentor and support teammates by onboarding and guiding new engineers.

To thrive in this role, you should have:

• Excellent communication skills: strong written and spoken English.
• Educational background:
  Bachelor’s degree in Computer Science or a related field, or equivalent professional experience.
• Professional experience: 4+ years building and maintaining production systems, ideally involving financial data, billing, or payments.
• Programming expertise: strong proficiency in at least one modern language such as Typescript, Java script, Java, Python, Scala, Ruby, or similar.
• Experience with payment systems: familiarity with Stripe or similar payment processors is a strong plus.
• Crypto and web3 experience: prior exposure to blockchain, crypto payments, wallets, smart contracts, or web3 infrastructure is a strong plus, though not a must‑have.
• A product‑oriented mindset: ability to balance technical quality with business impact.
• Diverse applicants are strongly encouraged to apply.

This is the full list of everything we’re looking for. You don’t need to check every single box to be a strong candidate, and having a good number of these would already indicate a solid fit for the role.

You will own critical systems at the heart of our financial infrastructure, powering subscriptions, payments, and usage for apps used by millions. As a Full‑stack Engineer, you’ll ship end‑to‑end, shape architecture, and solve meaningful challenges alongside a sharp, mission‑driven team. If you want autonomy, impact, and to build the future of onchain development, this is your place!

• Highly competitive compensation.
• Unlimited, flexible PTO.
• Company laptop and allowance for any necessary home equipment.
• Daily stipend for commuting to the office and/or for meals.
• Company‑paid trips for annual off‑sites and team bonding.
• Flexible work schedule.
• Flexible retribution through Cobee.
• Medical & Dental coverage.

• 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…