Join Alt as a Senior Fullstack Engineer, Payments, and build the financial engine that powers liquidity for our marketplace. You’ll be part of a high-impact team responsible for our custom double-entry ledger, payment provider integrations, and core lending products.

What You'll Do

Build and maintain our custom-built double-entry ledger system to ensure every cent is accounted for across the platform.
Design and scale our lending products—from the logic of credit disbursements to the automated lifecycle of loan management.
Design and implement robust integrations with payment gateways and banking partners, ensuring 99.99% reliability and seamless reconciliation.
Create high-trust user interfaces for payments and lending that make complex financial actions feel simple, transparent, and secure.
Make thoughtful trade-offs between rapid feature shipping and the uncompromising correctness required for financial systems.
Level up the team through rigorous code reviews, technical documentation, and mentorship.

What We're Looking For

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.

Nice to Have

Experience with distributed systems, credit/risk modeling, or the alternative asset space.

Technical Stack

Python, Postgres, AWS, React, TypeScript, SQL

Benefits & Compensation

Salary: $140,000-$180,000 + equity
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)