Software Engineer, Credit Card

As a Backend Engineer on the Credit Card team at OnePay, your work will directly shape the infrastructure behind our co-branded credit card product, holding the same bar for trust, security, and reliability as the rest of our financial ecosystem. You will:

• Design and build backend services that power our co-branded credit card product and its integrations with partner systems
• Architect APIs and event-driven systems that handle sensitive financial data securely at scale
• Partner with risk, compliance, and platform teams to ensure new features meet regulatory and security requirements
• Own reliability and performance for systems processing real-time credit transactions
• Drive technical decisions on system design, balancing scalability, security, and speed of delivery
• Mentor other engineers and raise the bar on code quality, testing, and operational practices across the team, 21 Days Ago Remote or Hybrid Denver, CO, USA Mid level Mid level Software Build and improve credit card transaction systems and fraud controls. Investigate declined authorizations, failed transactions, stuck holds, and fraudulent activity. Own Sardine rules, queues, scoring, monitoring, alerting, and automated mitigation. Query transaction data, investigate fraud cases, identify root causes, and create rules to prevent recurrence. Develop internal tools, dashboards, and scripts while partnering with Product, CX, Compliance, and external card and fraud vendors. Top Skills: Credit Card Transaction ProcessingFraud DecisioningSardineTransaction Monitoring Wipfli

Assistant Controller

12 Minutes Ago Remote or Hybrid 74K-100K Annually Senior level 74K-100K Annually Senior level Cloud * Fintech * Software * Business Intelligence * Consulting * Financial Services Manage day-to-day financial reporting and month-end close for nonprofit clients, review general ledgers and balance sheets, prepare monthly reporting packages and KPIs, maintain client procedures, oversee work papers, coordinate project tasks, and assist in estimating and managing accountants’ assignments and best practices development. Top Skills: Accounting SoftwareMicrosoft Office Suite Wipfli

• 3+ years of professional experience in backend or distributed systems development
• Experience building and operating production-grade APIs and microservices in a regulated or high-compliance environment (fintech, payments, banking, or similar)
• Proficiency in Node.js or similar modern backend frameworks (TypeScript, NestJS, Go, or Java)
• Familiarity with cloud-native architecture (Kubernetes, AWS) and event-driven or microservice-based systems
• Strong understanding of data security, PCI compliance, or similar standards protecting sensitive financial data
• Strong communication and collaboration skills across product, risk, and platform teams
• Drive and proactivity - everyone here is a builder and executor

Tools We Use

We use Node and TypeScript on the server, leveraging the NestJS framework within a microservice-oriented architecture running on Kubernetes and AWS. On the client side, we build and ship product features for iOS, Android, and web platforms using React Native. We also embrace AI-assisted development, so engineers have their choice of Claude Code or Cursor to fit their workflow. While you don’t need experience with our exact stack, familiarity with modern software engineering practices will help you ramp up quickly.

Build and operate secure, scalable backend services for OnePay’s co-branded credit card product. Design APIs and event-driven systems, integrate partner platforms, ensure regulatory and security compliance, and own reliability for real-time credit transactions. Collaborate with risk, compliance, and platform teams, make architecture decisions, mentor engineers, and improve code quality, testing, and operational practices. The summary above was generated by AI About OnePay

OnePay is the consumer fintech trusted by millions of Americans to make money better.

Our financial system is broken. High fees, low rates, and too few ways to actually grow your money. We’re fixing it. And we’re moving fast.

We’re an all-in-one financial services platform that brings together banking, high-yield savings, credit cards, point-of-sale lending, investing, and crypto in one place. We also partner with employers, HCM providers, gig platforms, and others to deliver embedded financial services to millions of employees and frontline workers.

We’re backed by Walmart, the world’s largest retailer, and Ribbit Capital, one of fintech’s most respected investors, giving us rare scale, distribution, and the opportunity to build something truly category-defining.

But what really sets OnePay apart is how we move. Our customers don’t have time to wait… and neither do we. This place moves fast, and we’re looking for people who are:

• Ready to run
• Hungry and driven by urgency
• Exceptional at what they do, with low ego
• Comfortable operating in motion, * Competitive base salary, stock options, and health benefits from Day 1
• 401(k) plan with company match
• Remote-friendly (US), flexible time off (FTO), and opportunities for growth
• A high-growth, mission-driven, inclusive culture where your work has real impact

Standard Interview Process

Our process varies by role. Most candidates go through:

• AI-assisted initial screen
• Interview with Talent Partner
• Technical or Hiring Manager Interview
• Team Interview
• Executive Interview
• Offer!, 12 Minutes Ago Remote or Hybrid 73K-98K Annually Senior level 73K-98K Annually Senior level Cloud * Fintech * Software * Business Intelligence * Consulting * Financial Services Manage financial reporting, complex general ledgers, account classifications, balance sheet reviews, month-end close, reporting packages, work papers, and client procedures for nonprofit organizations. Coordinate client workflows, support staffing and budgeting, collaborate across teams, develop best practices, and ensure accurate federal grant processing and reporting. Top Skills: Accounting SoftwareMicrosoft Office Suite

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