Alt - Senior Fullstack Engineer, Payments
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. • Database Mastery: • 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. • Fullstack Ownership: • Bonus: Experience with distributed systems, credit/risk modeling, or the alternative asset space. • Bonus: • What You’ll Get From Us: • 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) • Base salary range: $140,000-$180,000, plus equity. Offers may vary based on experience, location, and other factors.
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. • Own Lending Infrastructure: • Architect Integrations: Design and implement robust integrations with payment gateways and banking partners, ensuring 99.99% reliability and seamless reconciliation. • Architect Integrations: • Own the UX of Money: Create high-trust user interfaces for payments and lending that make complex financial actions feel simple, transparent, and secure. • Own the UX of Money: • Balance Rigor with Speed: Make thoughtful trade-offs between rapid feature shipping and the uncompromising correctness required for financial systems. • Balance Rigor with Speed: • Be a Multiplier: Level up the team through rigorous code reviews, technical documentation, and mentorship. • Be a Multiplier: • This is a perfect fit if you… • Are Obsessed with Correctness: You understand that in payments, "mostly working" is a failure. You think deeply about idempotency, race conditions, and data consistency. • Are Obsessed with Correctness: • Think Like a Product Owner: You don't just build a "pay button"; you understand the flow of funds and how to communicate financial status clearly to the user. • Think Like a Product Owner: • Love Building Infrastructure: You’re energized by the challenge of building a ledger or a lending engine from the ground up. • Love Building Infrastructure: • Are Pragmatic: You know when to build a custom internal solution and when to leverage a third-party API to get the job done. • Are Pragmatic:
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