Senior .NET API Engineer - REST, Azure, Hybrid (Finance)

Sestra People; Sydney; Hybrid; AUD 234,000 - 247,000; Full time

Benefits offered by this job

Hybrid working

3 days in office per week

6-month contract

Daily rate $900-$950

Job summary

Sestra People is seeking an experienced Senior .NET Developer to join a high-performing team delivering enterprise-grade APIs and analytics platforms supporting pricing, risk, and market data services.

This contract role offers a 6-month initial term with hybrid working (3 days in the office) in Sydney, focusing on REST-based services and collaboration across .NET, Python, TypeScript, and Excel-based platforms.

Qualifications

• 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 PostgreSQL databases.
• Ability to work independently in an agile environment.

Responsibilities

• Design and develop versioned REST APIs using ASP.NET Core.
• 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 across .NET, Python, TypeScript, and Excel.

Skills

C# and ASP.NET Core

RESTful APIs

Dependency injection

Asynchronous programming

Unit/integration testing

PostgreSQL

Agile

Tools

ASP.NET Core

PostgreSQL

Docker

Azure

OpenTelemetry

Job description

Sestra People is seeking an experienced Senior .NET Developer to join a high-performing team delivering enterprise-grade APIs and analytics platforms supporting pricing, risk, and market data services.

This contract role offers a 6-month initial term with hybrid working (3 days in the office) in Sydney, focusing on REST-based services and collaboration across .NET, Python, TypeScript, and Excel-based platforms.