Sr. Software Engineer (Payments)

Role overview Build and support payment software that enables nonprofit donations, with responsibility across processor integrations, asynchronous event handling, and donor-facing experiences. This hands-on senior role emphasizes secure, reliable payment flows and thoughtful improvements to a mature production system, using AI-assisted development throughout delivery.

Responsibilities - Design, test, and ship payment features across APIs, webhooks, and user interfaces. - Work with product, design, and support partners to understand customer needs and shape solutions. - Keep payment services secure, observable, and reliable; investigate production incidents through to root cause. - Improve existing code incrementally and help establish practices that keep AI-generated changes aligned with system architecture. - Review code, pair with teammates, share knowledge, and contribute payment expertise to cross-team work.

Requirements - Recent experience as a senior hands-on engineer delivering and supporting production applications. - Practical experience taking AI-assisted or AI-driven work into established production codebases, including shaping guardrails and review practices. - Strong understanding of software architecture, including distributed and event-driven systems, asynchronous programming, relational databases, automated testing, and modern frontend architecture. - Experience with payment processing at scale, including asynchronous confirmations, webhooks, retries, queues, rate limits, and traffic spikes; familiarity with a processor such as Stripe or PayPal. - Working knowledge of web and payment security, with sound judgment about reliability and design tradeoffs. - Clear, direct communication and comfort collaborating closely with a highly communicative team.

Benefits and work setup - Permanent, full-time remote role within the United States and select Canadian provinces; employees near the Indianapolis office may also work there. - Health, dental, and vision coverage; paid time off, flex and volunteer days, holidays, parental leave, retirement matching, and shipped work equipment. - Listed salary range: $114,800–$191,400, with a possible discretionary bonus. Compensation depends on qualifications, experience, and location.