Expert: Interactive Coding, Payments Processing (Contract, Remote)

Role overview Work live through realistic payment-processing coding and review scenarios in a sandboxed codebase, explaining your decisions as you go. Your practical expertise will help establish how AI systems should handle complex money movement, edge cases, and operational correctness. An AI background is not required; deep payments engineering experience is the focus.

Responsibilities - Implement or review changes involving payment authorization, capture, refunds, and voids. - Reason through idempotency, retries, duplicate or out-of-order webhooks, reconciliation, and settlement. - Assess ledger entries, rounding behavior, chargebacks, disputes, and authentication flows where relevant to a scenario. - Work on a shared screen during live sessions and describe the reasoning behind your approach. - Identify gaps between a provided scenario and real payment operations, then help define correct outcomes. - Write a concise asynchronous note describing your approach after each session.

Requirements - Substantial hands-on experience in one payments specialty, such as processor integration, ledger and accounting, disputes, or payment authentication. - Strong coding or code review skills relevant to your area of payments work. - Ability to reason carefully about failure cases and the consequences of incorrect payment state or accounting. - Clear communication while working through a problem and in short written summaries. - Availability for live sessions with a few hours of overlap with US or European working hours.

Nice to have - Experience writing payment-system design documents, incident reviews, or technical interview materials. - Familiarity with common weaknesses of AI coding tools on payment-related tasks.

Benefits and work setup - Independent contractor engagement, fully remote and open internationally. - Approximately 10 hours per week for an initial one to three months, with possible extension. - Pay is $150 per hour; the trial session is paid. - Selection includes a short interview and resume review, followed by a paid trial scored against a quality checklist. - Work must be original and human-authored. Do not use generated code or text, copied material, confidential transaction data, or employer/client assets.