Full Stack .NET Developer – Treasury & Financing Systems

Harvey Nash • Information Technology • IT Outsourcing & Dedicated Teams • JavaScript • TypeScript • C# • 4 days ago
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Salary
$86k – $101k per year
Location
Hybrid (Warsaw, Poland)
Employment
Full-Time

First seen by Alion on Oct 8, 2026.

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Harvey Nash

Harvey Nash is a technology services group that works with large and small clients on technology recruitment, IT outsourcing and leadership services. Its current postings are mainly senior AI, data and software engineering roles based in Warsaw and Kraków for client projects. The company is headquartered in London, United Kingdom.
harveynash.com • HQ: London, United Kingdom • IT Staffing & Staff Augmentation • IT Outsourcing & Dedicated Teams • 1001-5000 employees • Est. 1988
Tech stack of Harvey Nash

You will:

  • Build and own full-stack systems delivering workflow automation, real-time data and analytics for global treasury and trading professionals

  • Design and implement scalable C#/.NET services and APIs processing trades, financing and liquidity data

  • Build responsive single-page interfaces (React, TypeScript) surfacing large financial datasets to end users

  • Develop and optimize backend services using modern .NET technologies, including server-side pagination for large datasets

  • Extend, maintain and modernize legacy .NET Framework systems (margin calculation, financing platforms)

  • Partner with traders, treasury professionals and other technology teams to translate business needs into reliable solutions

  • Implement automated testing (unit, integration, TDD) and drive CI/CD and DevOps practices

  • Troubleshoot production incidents and improve system observability and monitoring

  • Collaborate as part of a distributed development team across multiple time zones

You bring:

  • Production experience with C# and the .NET ecosystem (.NET Framework and .NET Core), ideally in a financial domain

  • Experience with ASP.NET Core REST services, including server-side pagination for large datasets

  • Experience building SPAs in JavaScript/TypeScript using React (ag-grid or Highcharts a plus)

  • Strong experience with Microsoft SQL Server, including schema design and query tuning

  • Experience with automated testing and TDD practices

  • Knowledge of microservices, Docker, and observability/monitoring practices

  • Experience with DevOps and CI/CD tools (GitHub, GitLab, Jenkins)

  • Strong problem-solving and communication skills, comfortable in a distributed, cross-functional team

Tech stack

  • .Net
  • React
  • C#
  • API
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