Senior Backend Engineer — Payments Infrastructure

Payabli; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Competitive salary

Stock options

Flexible PTO

Medical, dental, & vision insurance

401K

Job summary

Payabli is seeking a Senior Software Engineer, Backend, based in the United States to help build the backend that sits between complex financial infrastructure and merchant-facing interfaces. You will design scalable services, implement payment routing, and manage platform configuration within a high-scale system.

In this hands-on role, you will collaborate with Product, AI, and Engineering teams, mentor junior engineers, and influence architectural decisions while delivering secure, observable

Qualifications

• 5+ years of experience building production backend services.
• Strong experience with C# and the .NET ecosystem.
• 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 modeling, 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.

Responsibilities

• Design, build, and maintain scalable backend services using C#/.NET.
• Develop the core infrastructure that powers payment routing, connector management, and platform configuration.
• Design secure, extensible APIs that support customer-facing applications, direct integrations and AI-powered workflows.
• Build reliable, observable services that process high-volume payment transactions with performance and resilience in mind.
• Contribute to platform architecture, engineering standards, and technical decision-making.
• Continuously improve system performance, security, reliability, and developer experience.
• Collaborate with other service owning teams to integrate via APIs and real-time data streams.

Skills

C#/.NET

Payments/FinTech

RESTful APIs

Distributed systems

Cloud applications

Problem solving

Technical leadership

Job description

Payabli is seeking a Senior Software Engineer, Backend, based in the United States to help build the backend that sits between complex financial infrastructure and merchant-facing interfaces. You will design scalable services, implement payment routing, and manage platform configuration within a high-scale system.

In this hands-on role, you will collaborate with Product, AI, and Engineering teams, mentor junior engineers, and influence architectural decisions while delivering secure, observable