Fullstack Engineer Spain at Crossmint

About Crossmint

Crossmint is the leading enterprise-grade, all-in-one stablecoin and wallet infrastructure platform enabling fintechs and enterprises to integrate stablecoin rails and smart wallets with speed, compliance, and scale.

Backed by Ribbit Capital, Franklin Templeton, NYCA, First Round, and Lightspeed Faction, with $23.6M raised in 2025. Trusted by more than 40,000 clients including global leaders such as MoneyGram, WireX, Toku, and more, Crossmint provides embedded smart wallets, on/offramps, cross-chain stablecoin orchestration, tokenization, and other blockchain primitives through simple, developer-friendly APIs that integrate in minutes and scale to millions of users.

In January 2026, Crossmint secured MiCA authorization from Spain's CNMV, becoming one of a select few stablecoin infrastructure providers fully licensed to operate across all 27 EU member states and held to the same regulatory standards as traditional financial institutions. Crossmint also powers the Republic of the Marshall Islands' first digital UBI program, backs MoneyGram's new stablecoin cross-border experience launching in LATAM, and recently partnered with WireX to expand multichain stablecoin payment infrastructure to non-EVM networks like Stellar.

The future of finance is stablecoin-native. Crossmint makes it easy to get there.

Location

We have offices in Madrid, and we are also open to a full remote setting from Spain.

Type of employment

Full-time, indefinite contract.

Seniority

4-7 years of experience. We are also open to considering candidates with more than 7 years of experience.

Responsibilities

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.

Your responsibilities will include:

Write high-quality code: correct, secure, performant, and maintainable.
Design and build backend and frontend systems: contribute 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: design and maintain systems that accurately track transactions, balances, and usage.
Collaborate on system architecture: write and review 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: take part in paid on-call shifts once or twice per quarter.
Mentor and support teammates: help onboard and guide new engineers.

About you

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, Javascript, 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.

Please keep in mind: 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.

Why Join Crossmint?

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!

Benefits

Extensive access to leading AI tools and subscriptions, with AI actively encouraged and integrated into daily workflows.
Stock options program.
We conduct two performance reviews annually. The first addresses performance ratings, bonuses, and promotions. The second encompasses these elements along with salary adjustments reflecting inflation and market conditions.
Unlimited Paid Time Off.
Company laptop.
Annual home office and productivity stipend.
Daily stipend for in-office meals and/or commuting to the office.
Three company-paid off-sites each year. Recent ones include: Miami, Lisbon, Medellín, Panamá.
Health + Dental insurance fully covered by Crossmint.
Flexible retribution with tax benefits through Cobee.

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.

Who will be in contact with you

Our People Ops team will be joining you throughout the entirety of the interview and onboarding processes. Feel free to reach out if you need anything!

Adolfo Fernández - Recruitment & People Ops
Gloria Alogo - People Ops, Onboarding & Benefits
Jon Eichhorn - Head of HR

⚠️ Please note that these are the only members of our People Ops team. Please remain vigilant and watch out for impersonators.

Department Engineering Role Full Stack Engineer Locations Madrid Remote status Hybrid Employment type Full-time Engineering · Madrid · Hybrid Full-stack Engineer (Spain)

Fullstack Engineer Spain

Crossmint

Job Description