Senior .NET Developer (Financial Services) 6-Month Contract | $900-$950 per day | Hybrid Working (3 Days in Office)

We are seeking an experienced

Senior .NET Developer

to join a high-performing team delivering modern financial technology solutions. This is an exciting opportunity to work on enterprise-grade APIs and analytics platforms supporting sophisticated pricing, risk, and market data services.

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.

About the Role 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.

Key Responsibilities

Design and develop versioned REST APIs using

ASP.NET Core and .NET 10

Integrate pricing, market curve calibration, risk, scenario, and product engines

Design strongly-typed API contracts and persistent financial domain resources

Build and maintain integrations with

PostgreSQL , reference data services, and external data sources

Develop background processing and data import services

Ensure compatibility with shared

.NET Standard 2.0

libraries

Create and maintain unit, integration, API contract, and OpenAPI test suites

Implement observability solutions including tracing, metrics, diagnostics, and orchestration using

.NET Aspire

and





OpenTelemetry

Collaborate with cross-functional teams developing solutions in .NET, Python, TypeScript, and Excel

Required Skills & Experience

Strong commercial experience with

C# and ASP.NET Core

Proven experience designing and building RESTful APIs

Solid understanding of dependency injection and modern software architecture principles

Experience with asynchronous and concurrent programming patterns

Strong testing background, including unit and integration testing

Experience working with relational databases, particularly

PostgreSQL

Strong problem-solving skills and ability to work independently in an agile environment

Desirable Experience

Financial markets or capital markets experience

Knowledge of quantitative analytics and numerical methods

Experience building distributed systems and microservices architectures

Docker containerisation experience

Azure cloud platform experience

CI/CD pipeline implementation and automation

Experience with observability platforms and application monitoring

What's on Offer?

6-month initial contract

$900-$950 per day

Hybrid working model with

3 days per week in the office

Opportunity to work on sophisticated financial systems and modern technology stacks

Collaborative, highly skilled engineering environment

Potential for contract extension based on project requirements

If you're a robust .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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