Seeking a Senior Backend Engineer for a payment modernization project, focusing on API integrations, payment routing logic, and payment orchestration systems under the CTO's guidance.
Location: Remote (U.S. overlap preferred)
Type: Contract (Full-Time Preferred)
Domain: Payments / Fintech / eCommerce Infrastructure
We are leading a modernization initiative for a high-growth digital commerce platform focused on payment orchestration, gateway optimization, and API-driven architecture.
Experience with orchestration platforms such as Gr4vy, Stripe, etc. is highly desirable, but not required. Deep payments experience is mandatory.
About the RoleWe are seeking a senior backend engineer to support a payment modernization initiative. You will work directly under the CTO to build and integrate payment orchestration systems and direct PSP connections.
Responsibilities- Build and maintain API integrations with multiple PSPs
- Implement payment routing logic
- Develop webhook handlers
- Implement tokenization flows
- Support subscription billing logic
- Ensure resilience, observability, and clean error handling
Requirements
- 6+ years backend experience
- Strong in one or more:
- Node.js
- Java
- Python
- Go
- Extensive REST API integration experience
- Webhook processing experience
- Payments domain experience required
- Strong understanding of:
- Auth/Capture flows
- Refund logic
- Chargeback lifecycle
- Subscription billing
Benefits
- High-Impact Architecture Project
- Executive Visibility
- Competitive Contract Compensation
- Flexible Remote Structure
- Clear Scope, Clear Timeline
- Long-Term Engagement
- Technical Ownership
Similar Jobs
Fintech • Payments • Financial Services
Build, evolve, and maintain large-scale Ruby-based backend payment services (accounts, wallets, balances, authorization, card lifecycle). Design, test, deploy, monitor production systems, improve reliability and performance, drive architecture, lead end-to-end projects, mentor engineers, and collaborate with product and cross-functional teams across distributed locations.
Top Skills:
Event-Driven SystemsKafkaNon-Relational DatabasesRabbitMQRelational DatabasesRuby
Artificial Intelligence • Consumer Web • Digital Media • Information Technology • Social Impact • Software
Lead SRE work to keep Circle highly available and performant: respond to incidents, own monitoring/alerting/log management, manage and optimize MySQL/Postgres/ClickHouse/Redis databases, maintain server infrastructure and deployment pipelines, collaborate with engineering teams, and build internal SRE tooling and automation.
Top Skills:
AWSClickhouseKubernetesLlm-Based Tools (Copilots)MySQLPostgresRedis
Edtech • Social Impact
Own end-to-end experience design for CodePath’s learning platform: map flows, navigation, and IA; build and maintain a design system; run product discovery with users and stakeholders; produce engineer-ready wireframes, prototypes, and specs; partner with PMs and engineers; and direct a UI contractor to deliver high-quality, consistent experiences.
Top Skills:
AIAnthropicClaudeCSSFigmaHTMLLlmTailwind
What you need to know about the NYC Tech Scene
As the undisputed financial capital of the world, New York City is an epicenter of startup funding activity. The city has a thriving fintech scene and is a major player in verticals ranging from AI to biotech, cybersecurity and digital media. It also has universities like NYU, Columbia and Cornell Tech attracting students and researchers from across the globe, providing the ecosystem with a constant influx of world-class talent. And its East Coast location and three international airports make it a perfect spot for European companies establishing a foothold in the United States.
Key Facts About NYC Tech
- Number of Tech Workers: 549,200; 6% of overall workforce (2024 CompTIA survey)
- Major Tech Employers: Capgemini, Bloomberg, IBM, Spotify
- Key Industries: Artificial intelligence, Fintech
- Funding Landscape: $25.5 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Greycroft, Thrive Capital, Union Square Ventures, FirstMark Capital, Tiger Global Management, Tribeca Venture Partners, Insight Partners, Two Sigma Ventures
- Research Centers and Universities: Columbia University, New York University, Fordham University, CUNY, AI Now Institute, Flatiron Institute, C.N. Yang Institute for Theoretical Physics, NASA Space Radiation Laboratory


