Senior Software Engineer, Payments

Order.co

Senior Software Engineer managing payments systems at Order.co. Designing and implementing features for money movement and payment processing to enhance client interactions.

Posted 5/27/2026full-timeNew York City • New York • 🇺🇸 United StatesSenior💰 $175,000 - $195,000 per yearWebsite

Tech Stack

Tools & technologies

AWSCloudGraphQLPostgresRubyRuby on RailsSQL

About the role

Key responsibilities & impact

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

What you’ll need

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

Comp & perks

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

ATS Keywords

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Hard Skills & Tools

RubyRuby on RailsPostgreSQLSQLAPI designweb application securityscalable system architecturepayment processingevent-driven pipelinesdata structures

Soft Skills

problem-solvingcommunicationmentoringdesign review participationtechnical influencequality assurancerisk managementcollaborationscoping and estimationdebugging