Alt Platform Inc - Senior Software Engineer, Payments

• 5+ years of experience with a heavy focus on backend systems — Python, Postgres, AWS. • You've worked on real money movement. ACH origination and returns, RTP or FedNow, wires, or equivalent. You know what an R01 is, why NACHA return windows matter, and why a credit-push rail changes the product flow and not just the API call. • You've integrated more than one payment provider in production, and you've lived through one of them failing. • You've handled large transactions, where the failure mode is a five- or six-figure problem and someone notices immediately. • You're API-native. Webhooks, idempotency, eventual consistency, and exactly-once delivery are your default vocabulary. • Strong SQL and relational design. You know how to write a transaction that won't fail under load — including at auction close and during scheduled auto-pay batches. • Marketplace or two-sided flow experience. Buyers and sellers, settlement between them, and the timing tension that creates. • An obsession with reliability. You think deeply about idempotency, race conditions, and what happens on the third retry. • Product-owner thinking. You don't just build a pay button. You understand the flow of funds and how to communicate financial status clearly to a user who is worried about their money. • Pragmatism. You know when to build a custom internal solution and when to leverage a third party to get the job done. • Strongly preferred: direct experience with Stripe, Plaid, Airwallex, PayPal, Modern Treasury, or Increase, and with evaluating or building a payment orchestration layer across more than one of them. • Strong plus: fraud, dispute, or chargeback work on a marketplace; hands-on with risk tooling like Sardine, Sift, or Stripe Radar; enough React and TypeScript to ship the payment-method and payout surfaces you own. • Bonus: distributed systems; stablecoin or on-chain settlement; KYC/KYB, bank partnership, or bank-sponsor program exposure; the alternative asset space. You collect, or you have a view on where this market is going. • HOW WE'LL INTERVIEW YOU • We'll be specific so you can prepare. Before any of it: download the app, put a card up, make a bid, and try selling — go through the workflows. Every round assumes you've used the product, and we expect your point of view to sharpen as you go. For this role, look specifically at the deposit, payment method, and payout surfaces. • 1. Recruiter screen — 25 minutes, Google Meet. Come ready to talk about the metric you own today and how you're performing against it, why Alt specifically, and how you're actually using AI. We'll answer your questions. • 2. Hiring manager — 45 minutes, Google Meet. Be ready to go deep on the provider integration or money-movement system closest to your own hands: what you built versus inherited, the trade-offs you made, and what you'd change now. • 3. Technical screen — 60 minutes. A hands-on working session on a rail behaving badly — duplicate and out-of-order webhooks, a late return, a provider that acks and then times out — and a payout batch that has to complete exactly once. Think out loud. • 4. Architecture and system design — 60 minutes. Design a payment orchestration layer under real constraints: two providers, failover mid-batch, instant and batch payouts, a risk hold on a five-figure transfer, and a ledger contract you don't control. We'll push back on at least one of your choices on purpose — how you take that matters as much as the design. • 5. Culture interview — 30 minutes. How you work with the people who depend on your systems — operations, finance, support, and the customer on the other end of a held transfer. • 6. Leore, our founder and CEO — 30 minutes. Everyone who joins Alt meets Leore. Come with a point of view on where you'd take Alt's money movement first. • 7. Reference check(s) — 15 minutes with a former manager(s).