Staff Software Engineer, Ledger

WHAT YOU BRING

• You have owned a double-entry ledger in production. Built one, migrated one, or been the person accountable for one. You can explain a modeling decision you would make differently now, and why.
• You have moved real money on real rails. 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 have handled large transactions, where the failure mode is a five- or six-figure problem and somebody notices immediately.
• Database mastery. Expert SQL and relational design, and a transaction that holds under load at auction close and during scheduled auto-pay batches. Python, Postgres, and AWS are our stack.
• You're API-native. Webhooks, idempotency, eventual consistency, and reconciliation are your default vocabulary, not terms you looked up.
• You've built real things with AI, not just used it. Agents, skills, MCP servers, connectors, internal tooling people depend on.
• Product-owner thinking. You don't just build a pay button. You understand the flow of funds and how to tell a worried customer what happened to their money.
• Restraint. The most common way this seat fails is overengineering. You know when a queue and a lambda are the answer and when they are three new partial-failure modes.
• We read the work, not the years. Most people who clear this bar have five to ten years behind them, and we have no interest in screening out the person who got there faster.
• Strong plus: enough React and TypeScript to ship the customer-facing surface that reads off your ledger. This is not a fullstack seat, but the person who can take a ledger change all the way to the UI will go further here.
• Backgrounds that fit: payments or ledger infrastructure at a pre-IPO fintech, core banking or money movement at a marketplace, a founding or early engineer who built the money layer, or an infrastructure engineer who took ownership of financial correctness because nobody else would.
• Bonus: distributed systems, credit or risk modeling, direct experience with Stripe, Plaid, Airwallex, PayPal, Modern Treasury, or Increase, evaluating or implementing a third-party ledger service (Modern Treasury, Fragment, Formance, TigerBeetle or similar), stablecoin or on-chain settlement, KYC/KYB, bank partnership, or SOX and audit-readiness exposure. You collect, or you have a view on where this market is going.
• US-based, remote.
• 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. 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 cash advance, deposit, and payout surfaces.
• Recruiter screen, 25 minutes, Google Meet. The metric you own today and how you're performing against it, why Alt specifically, and how you're actually using AI. We align on comp here and answer your questions.
• Hiring manager, Robbe Simon, 45 minutes, Google Meet.
• Technical screen, 60 minutes.
• Architecture and system design, 60 minutes.
• 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.
• 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 ledger and money movement first.
• Reference check(s), 15 minutes, with a former manager.
• Compensation: $200,000 - $500,000 per year, plus equity for all full-time employees.

What we offer: