Full-stack Engineer - Payments (Spain)
9.0/10
Crossmint
$150,000 – $200,000 USD
Remote
senior
about 2 months ago
cryptodevfintechweb3TypeScriptJavaScriptStripeAdyen
AI Summary
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Description
What you'll do
- •Design and build payment infrastructure: processor integrations, transaction pipelines, settlement and reconciliation workflows, and the APIs clients depend on.
- •Own critical financial flows end to end, including failure modes, retry logic, state management, and edge cases that matter in production.
- •Work across the stack: backend-heavy, but you will contribute to APIs, dashboards, and the interfaces clients use to interact with payment systems.
- •Ensure data integrity across providers and chains: balances, transaction states, and audit trails that stay consistent even when third-party systems don't.
- •Contribute to architecture decisions: write design docs, review peers' proposals, and help the team make good long-term calls.
- •Participate in on-call rotations (paid, once or twice per quarter) and own incidents on the systems you build.
- •Help onboard and mentor newer engineers as the team grows.
Conditions
- •Extensive access to leading AI tools and subscriptions, with AI actively encouraged and integrated into daily workflows.
- •Stock options program.
- •Two performance reviews annually.
- •Unlimited Paid Time Off.
- •Parental Leave program.
- •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.
- •Health + Dental insurance fully covered by Crossmint.
- •Flexible retribution with tax benefits through Cobee.
Requirements
- •4+ years building and maintaining production backend systems, ideally involving financial data, payments, or transaction-critical infrastructure.
- •Strong proficiency in TypeScript or JavaScript (our primary stack), or another typed modern language with willingness to move quickly.
- •Solid understanding of distributed systems fundamentals: idempotency, consistency guarantees, failure handling, async workflows.
- •Fluent in English, written and spoken.
- •Hands-on integration experience with Stripe, Adyen, or similar payment processors.
- •Exposure to stablecoin infrastructure, crypto payments, wallets, or cross-chain systems.
- •Experience operating financial systems in regulated environments.
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