Job Description
Senior .NET Developer (Financial Services)
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6-Month Contract | $900-$950 per day | Hybrid Working (3 Days in Office)
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We are seeking an experienced Senior .NET Developer to join a high-performing team delivering modern financial technology solutions. This is an exciting chance to work on enterprise-grade APIs and analytics platforms supporting sophisticated pricing, risk, and market data services.
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This role will suit an engineer with strong backend development expertise, a passion for clean API design, and experience building scalable, high-performance systems within complex environments.
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About the Role
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As a Senior .NET Developer, you will be responsible for designing, developing, and maintaining modern REST-based services that underpin critical financial applications. You'll collaborate closely with engineers across .NET, TypeScript, Python, and Excel-based platforms to deliver robust and scalable solutions.
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Key Responsibilities
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Design and develop versioned REST APIs using ASP.NET Core and .NET 10
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Integrate pricing, market curve calibration, risk, scenario, and product engines
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Design strongly-typed API contracts and persistent financial domain resources
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Build and maintain integrations with PostgreSQL, reference data services, and external data sources
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Develop background processing and data import services
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Ensure compatibility with shared .NET Standard 2.0 libraries
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Create and maintain unit, integration, API contract, and OpenAPI test suites
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Implement observability solutions including tracing, metrics, diagnostics, and orchestration using .NET Aspire and OpenTelemetry
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Collaborate with cross-functional teams developing solutions in .NET, Python, TypeScript, and Excel
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Required Skills & Experience
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Strong commercial experience with C# and ASP.NET Core
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Proven experience designing and building RESTful APIs
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Solid understanding of dependency injection and modern software architecture principles
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Experience with asynchronous and concurrent programming patterns
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Strong testing background, including unit and integration testing
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Experience working with relational databases, particularly PostgreSQL
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Strong problem-solving skills and ability to work independently in an agile environment
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Desirable Experience
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Financial markets or capital markets experience
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Knowledge of quantitative analytics and numerical methods
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Experience building distributed systems and microservices architectures
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Docker containerisation experience
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Azure cloud platform experience
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CI/CD pipeline implementation and automation
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Experience with observability platforms and application monitoring
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What's on Offer?
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6-month initial contract
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$900-$950 per day
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Hybrid working model with 3 days per week in the office
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Opportunity to work on sophisticated financial systems and modern technology stacks
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Collaborative, highly skilled engineering setting
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Potential for contract extension based on project requirements
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If you're a strong .NET engineer looking to work on challenging financial technology projects using the latest Microsoft technologies, we'd love to hear from you.

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