Sr. Software Engineer (Backend)

IXOPAY is an enterprise-grade global payment infrastructure platform focused on AI-driven intelligence, payment orchestration, advanced tokenization, and payment optimization. The company is seeking a Senior Software Engineer to build scalable backend services and infrastructure for intelligent payment routing, connector management, token intelligence, and platform configuration. The role also involves API design, architecture contributions, collaboration with Product and AI teams, and mentoring junior engineers.

Responsibilities:

• 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

Requirements:

• 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