Senior Software Engineer

Role summary

A senior engineer who can pick up any of our payment products and deliver backend features and services end-to-end. You design systems, set the code-quality bar by example, mentor other engineers, and help keep production healthy. Because you may move between products, the ability to learn quickly in an unfamiliar codebase is key.

Key responsibilities

• Deliver backend features and services end-to-end — design, build, test, deploy, and monitor — across multiple products.
• Design APIs and systems (microservices, modular monolith, Domain-Driven Design); own performance and security by default.
• Review code with meaningful feedback and mentor junior and mid-level engineers.
• Take part in production support / on-call; investigate incidents to root cause and improve reliability.
• Use AI-native tools (Kiro, GitHub Copilot) and build reusable skills / automation that speed up the team.
• Contribute to shared libraries, standards, and reusable components.

Required qualifications & skills

• 5+ years of professional software engineering.
• Deep hands-on expertise in C# / .NET and ASP.NET Core (REST APIs, dependency injection, async).
• Strong relational database skills (SQL Server / MySQL) with EF Core and Dapper.
• Cloud experience on AWS (ECS / EKS, Lambda, S3, SQS, RDS) and Docker.
• Solid grasp of microservices, modular monolith, and Domain-Driven Design; good API design.
• Automated testing (xUnit + mocking), monitoring / observability, CI/CD, and secure coding; awareness of payment compliance (PCI-DSS).
• Comfortable using AI-assisted development tools daily.
• Able to get productive quickly in an unfamiliar codebase.

Nice to have (one or more)

• Payments — card issuing, 3-D Secure / ACS, or payment gateway.
• Java with jPOS / ISO-8583; Visa / Mastercard host integration.
• Microsoft Orleans, gRPC, or GraphQL.
• Applied cryptography / HSM.
• Messaging / streaming with Kafka.
• Alternative datastores — OceanBase, DynamoDB, MongoDB.
• Infrastructure as Code with Terraform.