A US tax software company is moving a critical legacy system to a modern .NET 8+ backend built on Clean Architecture, and needs a senior backend engineer to drive the API migration. The environment is high-availability, with complex business rules and strict security requirements.
What you'll do
Translate complex legacy business logic into .NET 8+ Web APIs (Domain, Application, Infrastructure).
Build secure APIs with strict authentication flows and compliance-driven session timeouts.
Tune MySQL data access: Dapper for performance-critical paths, EF Core for the rest of the domain.
Define API contracts with the Next.js frontend team and integrate payment providers (Braintree, Paymentech).
What we're looking for
5+ years of backend development with .NET / C# on enterprise services.
Production experience with Clean Architecture and CQRS (MediatR or similar).
Strong MySQL, with Dapper for complex queries and EF Core for domain work.
Hands-on AWS: Fargate and RDS.
Unit and integration testing as part of how you work.
C1 English.
Nice to have: payment gateways, regulated environments (SOC 2, PCI-DSS, GDPR), Redis, SQS or RabbitMQ.
Good to know
Full-time, fully remote, contractor engagement, paid in USD (USD 2,500-3,000/month).
Hiring through Niuro.