Senior Software Engineer - Payments

Salary: $200K to $300K plus highly competitive equity Industry: Fintech / Payments Work Authorization: This role does not offer H-1B transfers/sponsorship. Green card holders and TN visa holders are welcome to apply. Who you’ll join: A Series A-stage fintech building global payment and account infrastructure for banks, platforms, and marketplaces. The product sits at the intersection of local fiat rails and blockchain-based settlement, letting businesses receive, store, convert, and send money across borders faster and cheaper than traditional alternatives. ARR has grown 20-50% month over month for the last four to five months, with annualised payment volume exceeding $2 billion. What you’ll do: Architect acquirer integration covering authorization, capture, void, refund, 3DS, and settlement flows. Design PCI-compliant tokenization, vaulting, and checkout surfaces to minimize card data scope. Build payment orchestration abstractions that support multiple networks, acquirers, and geographies. Develop chargeback, dispute, and fraud signal pipelines including evidence submission and representment. Design idempotent, auditable workflows across card authorization, capture, and payout processes. Contribute full-stack to platform API surfaces, hosted payment flows, SDKs, and iframes. Communicate tradeoffs across acquirers, processors, and gateways covering cost, auth rates, and observability. Who you’re: Have direct, hands-on integration experience with an acquirer, processor, or gateway, such as Adyen, Checkout.com, Worldpay, Fiserv, or Braintree. Previously worked at an early-stage startup, or founded your own company. Hold 5+ years building production payment systems. Understand PCI scope minimization, tokenization strategies, and secure checkout surface design. Have built complex async systems, queues, retries, and eventual consistency patterns in production. Work autonomously, define your own approach, and unblock yourself without needing direction. Thrive in a high-ownership, fast-moving environment where scope expands quickly. Bonus: experience with network tokens, account updater, or partial capture edge cases. Why you’ll thrive: Compensation reaches $300K cash, with meaningful equity on top at this stage of the company's growth. You own the card processing infrastructure from zero, not a slice of an existing system. Every project on the roadmap is net new product surface area, nothing here is pure maintenance work. The company is processing over $2 billion annualized volume and growing fast, so your work ships to real scale immediately. #J-18808-Ljbffr