Senior Software Engineer, Backend

The role

You will design, build, and maintain scalable backend services using C#/.NET. You will work on services for payment routing, connector management, and platform configuration for enterprise customers.

What you will do

• Design, build, and maintain scalable backend services using C#/.NET
• Develop core infrastructure for payment routing, connector management, and platform configuration
• Design secure, extensible APIs for customer-facing applications, direct integrations and AI-powered workflows
• Build reliable, observable services for high-volume payment transactions
• Contribute to platform architecture, engineering standards, and technical decision-making
• Improve system performance, security, reliability, and developer experience
• Collaborate with other service owning teams via APIs and real-time data streams
• Lead code reviews and drive architectural decisions
• Mentor engineers through pairing and documentation
• Work across requirements, implementation, testing, and deployment

Required qualifications

• 5+ years of experience building production backend services
• Strong experience with C# and the .NET ecosystem
• Strong experience in Payments, FinTech, or other high-volume transaction processing environments
• Experience designing and building RESTful and/or event-driven APIs
• Strong understanding of relational databases, data modelling, and distributed systems
• Experience building secure, scalable cloud-based applications
• Excellent problem-solving, communication, and collaboration skills
• Ability to provide technical leadership while remaining hands-on in development

Benefits

• Competitive salary
• Stock options with the potential to unlock more equity as we grow
• Flexible PTO
• Paid parental leave
• Medical, dental, & vision insurance
• 401K
• HSA
• Pre-tax savings programs

Before you apply

• Principals only
• No external agency submissions
• Candidates must apply directly

About the company

Payabli is the Intelligent Fintech Operating System for software platforms. It provides PayFac capabilities, embedded payment acceptance and issuance, and intelligent payment operations.