Full-stack Engineer - Console & Billing (Spain)

About Crossmint

The world is coming onchain. Our mission is to make that happen, faster.

Crossmint is the leading platform for companies to build onchain. We provide all the infrastructure necessary to build applications scalable to millions of consumers, while making blockchain technology invisible to end users.

Crossmint completely removes the complexity of blockchain for both companies and users. Companies don’t need to have blockchain engineers, hold cryptocurrencies, and can leverage a one-stop-shop, instead of orchestrating many different vendors, which often results in disjointed consumer experiences, higher costs, and slower go-to-market. For users, the experience is indistinguishable from that of the traditional web — replacing passphrases with biometrics and eliminating gas fees and other friction points.

Our suite of products includes wallets-as-a-service, tokenization, payments, onchain credentials, and other essential building blocks for companies to build anything onchain.

Supporting 40+ different blockchains, Crossmint makes it easy for companies to leverage blockchain rails and create experiences accessible by mainstream users.

Our team includes math olympiad winners, Guinness world record holders, athletes, music composers, empaths, and degens.

Location

We have offices in Madrid (Gran Vía), 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 for the Developer Console team at Crossmint, you will play a crucial role in building and maintaining the financial infrastructure that powers our ecosystem. You will ensure the seamless management of subscriptions, payments, and usage reporting, enabling our users to engage with our services effortlessly. Your responsibilities will include:

• Write high-quality code: correct, secure, performant, maintainable.
• Develop and optimize billing workflows: Design, implement, and improve the billing system that manages subscription plans, processes payments, and integrates with Stripe for project fund management.
• Architect and maintain financial data systems: Ensure user transactions, balances, and payment methods are accurately stored and managed.
• Enhance the Usage section: Build tools to track and report usage metrics, providing transparency to users on their consumption.
• Write architectural and design docs individually and with the team.
• Run your projects end to end: from conceptualization to shipping and beyond.
• Perform On-Call duties: participate in paid on-call shifts (once or twice a quarter).
• Mentor new team members.

About you

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

• 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.
• Professional Experience: Accumulate 4+ years of professional experience in developing production systems, with a focus on financial systems, subscription models, or payment integrations.
• Programming Expertise: Showcase advanced knowledge in at least one modern programming language such as Typescript, Javascript, Java, Python, Scala, Ruby, etc., with an emphasis on secure and scalable financial processing.
• Experience with Stripe or similar payment processors: A strong plus if you have worked with billing integrations and payment flows.
• Diverse applicants are strongly encouraged to apply.

Benefits

• 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.

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.