Principal Software Engineer

Stelfox is partnering with a Fintech provider located in Cork City who are going through a product \& platform modernisation process as they truly embrace the power of AI\-assisted development to help extend AI capability on top of their existing product line for their enterprise customers. You will feel comfortable around legacy .Net platforms and have lived through a migration or platform modernisation initiative by building a parallel solution alongside an existing live system running in production. **Topics that you are use to:** * .Net Internals \- how thread pool and async/await interact * SQL Server \- performance optimisation, running profiler, indexing, partitioning, utilising Azure SQL elastic pool and look maybe look at moving logic into the APIs. * Working inside the IDE and pushing code to production daily and utilising AI code assistants or agent platforms to your advantage (Cursor, Claude code etc). **Experience \& Skills requirement:** * **Expert\-level experience** with **.NET / C\#** , deep understanding of frameworks, modern patterns (async/await, dependency injection, clean architecture, domain modeling). * Strong full\-stack development experience, including TypeScript/Angular * Cloud\-native development on Azure (AWS/GCP are transferable) * Database design, optimization, and migration strategies for high\-volume systems * CI/CD pipelines and automated deployment practices * Designing scalable APIs and managing versioning and backward compatibility * Experience implementing testing strategies across unit, integration, and end\-to\-end testing layers * Large\-scale refactoring and modernization approaches such as incremental decomposition or strangler patterns Please note, this position is located in Cork with 3 days in office, 2 remote from home, so candidates will need to be either located in or near Cork or be willing to relocate for this opportunity.