Senior Fullstack Engineer, Payments
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Job Description
Senior Fullstack Engineer building the financial engine of a trading-card marketplace. Working on payment integrations, lending products, and financial integrity systems.
Responsibilities:
- Engineer Financial Integrity: Build and maintain our custom-built double-entry ledger system to ensure every cent is accounted for across the platform.
- Own Lending Infrastructure: Design and scale our lending products—from the logic of credit disbursements to the automated lifecycle of loan management.
- Architect Integrations: Design and implement robust integrations with payment gateways and banking partners, ensuring 99.99% reliability and seamless reconciliation.
- Own the UX of Money: Create high-trust user interfaces for payments and lending that make complex financial actions feel simple, transparent, and secure.
- Balance Rigor with Speed: Make thoughtful trade-offs between rapid feature shipping and the uncompromising correctness required for financial systems.
- Be a Multiplier: Level up the team through rigorous code reviews, technical documentation, and mentorship.
Requirements:
- 5+ years of experience with a heavy focus on backend systems (Python, Postgres, AWS) and a proven ability to build modern frontends (React, TypeScript)
- Fintech or Payments experience: You’ve worked with ledgers, payment processors, or lending products and understand the complexities of moving money.
- Database Mastery: You are an expert in SQL and relational database design—you know how to write a transaction that won't fail under load.
- Fullstack Ownership: A track record of taking a complex financial feature from a technical design doc all the way to a polished UI in production.
- Bonus: Experience with distributed systems, credit/risk modeling, or the alternative asset space.
Benefits:
- A seat at the table to help shape the future of Alt and the alternative asset space
- Autonomy and ownership on projects that matter
- $100/month work-from-home stipend
- $200/month wellness stipend
- WeWork office stipend
- 401(k) retirement benefits
- Flexible vacation policy
- Generous paid parental leave
- Competitive healthcare benefits, including HSA, for you and your dependent(s)
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