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About the Role

Seeking a Senior Software Engineer to modernize core C#/SQL systems by extracting legacy business logic, building clean services, and verifying changes in shadow mode with zero downtime to revenue flows.

Responsibilities

• Extract business rules scattered across C#, embedded JavaScript and undocumented SQL stored procedures into a clean, tested, dependency-free rules assemblies.
• Build new services cleanly with proper Dependency Injection (DI), robust authentication/authorization, structured logging, and full observability.
• Work fluently across both legacy .NET Framework 4.8 (ASP.NET MVC5, WebAPI 2, EF6) and modern .NET.
• Navigate across multiple existing systems such as the API façade, the ETL pipeline, and the SNS/SQS event bus.
• Deploy changes using shadow-mode verification until equivalence is rigorously proven.
• Refactor and optimize heavy SQL Server stored procedures and backend logic with total precision, ensuring client-money correctness is never compromised.

Requirements

• Senior-level, hands-on experience in modern .NET (.NET 6+) paired with deep, comfortable familiarity with legacy .NET Framework 4.8 (ASP.NET MVC 5, WebAPI 2, Entity Framework 6).
• High proficiency in reading, understanding, and safely refactoring complex, stored-procedure-heavy database logic.
• Working proficiency in JavaScript/TypeScript.
• A strong "legacy technology" instinct over a "rewrite everything" approach.
• Experience or comfort with golden-master testing, diffing, and shadow verification to mathematically/logically prove equivalence to legacy outputs.
• The ability to hold two disparate architectures in your head at once and reason through their edge cases, data flows, and coupling points.

Skills

• .NET Framework 4.8
• ASP.NET MVC5
• WebAPI 2
• EF6
• .NET 6+
• SQL
• JavaScript
• TypeScript
• jQuery
• AWS Lambda
• SQS
• SNS
• RDS

Work Type

• flexible hours
• hybrid work

Experience Level

• Senior-level

About the Company

• Shieldpay is an equal opportunities employer.

Equal Opportunity

• Shieldpay building a fair and transparent workforce begins with the recruitment process that does not discriminate on the grounds of gender, sexual orientation, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability or age.