Senior Fullstack Engineer - Payments Platform

About the Role

We're hiring a Senior Fullstack Engineer to join our innovative team at Alt. As a Senior Fullstack Engineer, you will play a crucial role in building the financial engine of our payments platform. This is not just about creating a checkout flow; it's about powering the liquidity that makes our marketplace thrive. If you are passionate about building robust financial systems and enjoy working in a dynamic environment, this Senior Fullstack Engineer remote position is perfect for you.

What You'll Do

• 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.

What We Offer

• 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).

This Senior Fullstack Engineer remote position offers a competitive base salary range of $140,000-$180,000, plus equity. Join us at Alt and be part of a team that is transforming the payments landscape!