[Hiring] Expert: Interactive Coding, Payments Processing @Patronus AI, Inc.

Role Description

You'll work live with our research team on coding scenarios in a sandboxed payments codebase:

• Authorization, capture and refund flows
• Idempotency and retries
• Webhook handling
• Reconciliation and settlement
• Ledger entries
• Chargebacks and disputes
• 3DS/SCA

You implement or review the change the way you would at work, explain your reasoning as you go, tell us where the scenario doesn't match how money actually moves, and help define what correct looks like.

Each session starts from a scenario we provide. You work through it on a shared screen, land the change or the review, and then write a short note on how you approached it. Your work becomes evaluation and training data for frontier models.

You don't need an AI background. You do need to be the kind of engineer who thinks about the duplicate webhook before the happy path, and who knows which rounding rule the ledger expects.

Qualifications

• 3+ years writing production code for a payment processor, a processor integration, a card issuer or acquirer, a fintech ledger or a bank's payments platform, including work within the last two years.
• Working command of the money-movement lifecycle end to end: authorization, capture, settlement, reconciliation and disputes, and the compliance edges such as PCI DSS and SCA.
• Comfortable in at least one of Python, Go, Java or TypeScript, and at reading unfamiliar codebases.
• Able to explain your reasoning out loud while you work, in clear professional English.
• Reliable availability for scheduled live sessions and the habit of showing the evidence behind every conclusion.

Requirements

• Experience with several processors or rails, such as Stripe, Adyen, card networks, ACH, SEPA or UPI.
• Experience writing technical design documents, incident reviews or interview questions for payments systems.
• Familiarity with how AI coding agents fail on payments work.

Benefits

• Independent contractor, fully remote.
• Live screen-share sessions with our researchers plus short asynchronous write-ups.
• Pay: $150 per hour. The trial session is paid.
• Commitment: About 10 hours per week, 1 to 3 months to start, with extension for strong performers.
• Start: Rolling.
• Location: Remote, any country, with a few hours of overlap with US or EU working hours.

How hiring works

• Short AI interview and resume review.
• One paid trial session, scored against a fixed quality checklist.
• Onboarding and your first project.