Senior .NET Engineer - SmartGrants

Location: Poland

Working mode: Remote (with occasional business travel)

Language: English

We are looking for a senior .NET engineer based in Poland. Working closely with technical and business stakeholders, you will take an active role in stabilising the solution, reducing technical debt and improving the engineering practices needed for dependable long-term operation. The role offers significant ownership and the opportunity to influence architecture, quality standards and technical priorities.

Your key responsibilities include the following:

• Build a strong understanding of the existing codebase, architecture, integrations and business-critical workflows

• Create and drive a risk-based technical debt roadmap focused on stability, security, maintainability and supportability through 2030

• Modernise the .NET application and key dependencies in pragmatic, incremental steps while protecting business continuity

• Diagnose and resolve production issues, recurring defects, performance bottlenecks and integration failures

• Improve automated testing, code quality, logging, monitoring and operational documentation

• Strengthen CI/CD, deployment practices, environment consistency and safe rollback approaches

• Document key design decisions, interfaces, runbooks and critical business logic, and share knowledge across the team

• Work with business and technical stakeholders to prioritise improvements according to operational risk and business value

What we are looking for

We are seeking a candidate with an educational background in Computer Science, Software Development or Engineering, as well as substantial experience in several of the following areas:

• Strong hands-on experience developing and maintaining backend applications using C# and .NET / ASP.NET Core

• Experience modernising legacy or business-critical applications without disrupting ongoing operations

• Solid knowledge of relational databases, SQL and Entity Framework

• Experience designing, maintaining and troubleshooting enterprise integrations and APIs

• Practical experience with Microsoft Azure, including application hosting, monitoring and cloud operations

• Experience with unit, integration and regression testing and improving test coverage in existing systems

• Good understanding of secure coding, dependency management and software lifecycle risks

• Experience with CI/CD, source control and modern software quality practices

• Strong analytical and problem-solving skills, with the ability to turn findings into pragmatic improvement plans

• Ability to work independently with a high degree of ownership and accountability

• Excellent communication skills and confidence working directly with technical and business stakeholders

Nice to have:

• Vue.js or another modern JavaScript framework

• Azure App Service, Azure SQL and Infrastructure as Code such as Bicep or ARM templates

• Observability, structured logging, alerting and production support

• Financial, invoicing or payment workflows

• SAP or other ERP integrations

• Experience from clinical development, life sciences or another regulated enterprise environment