Senior Software Engineer, Payments

🕒 May 27

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Order.co

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2016

☁️ SaaS

💳 Fintech

🤝 B2B

💰 $30M Series B - Order on 2022-01

SaaS • Fintech • B2B

Order. co is an AI-powered procurement and finance platform that streamlines purchasing, accounts payable, spend management, and working capital for businesses. The SaaS product automates the full procurement lifecycle—from requisition to payment—offers virtual vendor-locked cards, AP automation, automated reconciliation, and AI-driven sourcing and catalog management to reduce costs and manual work. It integrates with accounting systems (QuickBooks, NetSuite, Sage Intacct), Workday, and SSO providers, targeting finance and procurement teams at growing companies and enterprises seeking tighter spend control, compliance, and efficiency.

📋 Description

• Independently design and implement complex, multi-part features from requirements to production • Own subsystems, services, or critical components in the payments stack — for example, the internal financial ledger, the virtual-cards issuance and authorization lifecycle, bank connections, or the invoicing and auto-debit pipeline • Write clean, maintainable, production-ready code with consistent test coverage • Navigate existing codebases with architectural discernment • Debug production issues effectively; seek first to understand • Participate actively in design reviews • Propose sound technical designs that account for scalability, performance, and reliability trade-offs • Scope and estimate work accurately; solve problems in order • Deliver features end-to-end, including rollout coordination and post-release monitoring • Communicate risks and blockers early • Mentor junior and mid-level engineers through code reviews, pairing, and direct feedback • Influence technical decisions through credibility, not just seniority • Champion quality and standards; push back on shortcuts that create long-term cost

🎯 Requirements

• Strong foundation in computer science fundamentals: data structures, algorithms, and system design • Expertise in building production-grade applications and services using Ruby and Ruby on Rails • Extensive experience with PostgreSQL and SQL-based data modeling, including query optimization and performance tuning • Deep understanding of web application security, observability, and scalable system architecture • Proven ability to design, build, and maintain secure, scalable, and well-documented APIs • Experience building integrations with external systems — REST/GraphQL APIs, webhooks, event-driven pipelines, or third-party vendor connections • Hands-on experience with at least one payment processor or card issuer (Stripe, Lithic, Adyen, Marqeta, Braintree, or equivalents), or comparable fintech vendor work • Working familiarity with at least one of: double-entry ledger design, idempotency / exactly-once patterns for webhooks and money-movement, ACH / wire / card-network basics, or reconciliation against vendor reports • Familiarity with AWS and other cloud platforms, including infrastructure as code and CI/CD pipelines • Experience using AI coding assistants (e.g., Claude, GitHub Copilot) as part of your development workflow — not as a shortcut, but as a force multiplier; you provide them with appropriate context about constraints and conventions, critique AI output, recognize failure modes, and decide when to override

🏖️ Benefits

• Competitive compensation including base salary, bonus, and equity • Employer-sponsored 401(k) with match • Comprehensive medical, dental, and vision coverage • Flexible time off and hybrid work environment • Opportunity to build and scale a critical function at a high-growth fintech company