Sr. Software Engineer (Backend)

• Design, build, and maintain scalable backend services using C# and .NET.
• Develop the core infrastructure that powers payment routing, connector management, and platform configuration.
• Design secure, extensible APIs that support both customer-facing applications and AI-powered workflows.
• Build reliable, observable services that process high-volume payment transactions with performance and resilience in mind.
• Collaborate with Product and AI teams to translate business requirements into scalable technical solutions.
• Contribute to platform architecture, engineering standards, and technical decision-making.
• Mentor junior engineers through code reviews, design discussions, and day-to-day technical guidance.
• Continuously improve system performance, security, reliability, and developer experience.

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

• Experience in payments, FinTech, or other high-volume transaction processing environments.
• Experience with Azure services such as App Configuration and Key Vault.
• Knowledge of payment routing, PSP integrations, tokenization, or payment orchestration platforms.
• Experience building APIs or services that integrate with AI or LLM-based applications.
• Familiarity with plugin or adapter architectures and extensible platform design.
• Understanding of PCI DSS, credential management, and payment security best practices.
• Experience mentoring engineers in an agile development environment.

IXOPAY?

At IXOPAY, you'll help define the architecture behind the next generation of enterprise payment infrastructure.

You'll work on technically challenging problems at the intersection of distributed systems, AI, and global payments while collaborating with a small, highly experienced engineering team where your contributions have a direct impact.

We offer:

• Competitive salary and benefits
• Professional growth and development opportunities
• A collaborative, supportive engineering culture
• The opportunity to shape a modern AI-first platform from the ground up

• Medical, Dental, and Vision Insurance
• Flexible Spending Account (FSA) and Health Savings Account (HSA)
• Employer-paid Life, AD&D, Short-Term Disability, and Long-Term Disability Insurance
• Unlimited Paid Time Off and Paid Holidays
• 401(k) Plan with Employer Match

We know great candidates don't always meet every qualification.

If you're excited about this opportunity, we encourage you to apply—we'd love to hear what you can bring to IXOPAY.

IXOPAY is proud to be an Equal Opportunity Employer.

We consider all qualified applicants without regard to race, color, religion, sex (including pregnancy, sexual orientation, gender identity, or gender expression), national origin, age, disability, genetic information, veteran status, or any other characteristic protected by applicable law.

IXOPAY participates in E-Verify.