Senior Full Stack Software Engineer
About the role
We're hiring: Full Stack Engineer (.NET / React)
Our client is a well-established financial services firm with decades of experience in private equity and hedge fund investing. They're growing their technology team and looking for a Full Stack Engineer to help build and modernize the proprietary platforms that power their business, including new AI-driven automation initiatives.
This is a long-term, onsite opportunity for someone who wants ownership, autonomy, and a seat at the table on a lean, high-impact tech team.
What you'll do:
Build and support proprietary platforms across the business
Troubleshoot and resolve data, performance, and system issues
Modernize and optimize legacy systems and workflows
Design and implement AI-driven automations using tools like Claude and OpenAI
Collaborate cross-functionally to support firm-wide goals
What you bring:
5+ years developing with .NET / C# and React (TypeScript/JavaScript)
3+ years building solutions in financial services
Hands-on experience with frontier AI models: prompt design, harness engineering, API integration
Strong grasp of OOP principles, design patterns, and multi-tiered architectures
SQL Server experience, including stored procedures
.NET Framework 4.8+, .NET Core, Visual Studio
Experience with async/parallel programming in .NET
Microsoft Azure (App Service, Functions, Service Bus, Storage)
Solid DevOps practices (version control, release management)
Bachelor's degree in Computer Science
Must be a US Citizen or Permanent Resident
Research shows that candidates from underrepresented groups often wait until they meet nearly all requirements before applying, while others apply when meeting just 50-60%. If this role excites you and you meet many—but not all—of these criteria, we still want to hear from you.
We actively encourage applications from underrepresented talent and are committed to supporting accessibility needs throughout our hiring process.
Responsibilities
- Build and support proprietary platforms across the business
- Troubleshoot and resolve data, performance, and system issues
- Modernize and optimize legacy systems and workflows
- Design and implement AI-driven automations using tools like Claude and OpenAI
- Collaborate cross-functionally to support firm-wide goals
Qualifications
- 5+ years developing with .NET / C# and React (TypeScript/JavaScript)
- 3+ years building solutions in financial services
- Hands-on experience with frontier AI models: prompt design, harness engineering, API integration
- Strong grasp of OOP principles, design patterns, and multi-tiered architectures
- SQL Server experience, including stored procedures
- .NET Framework 4.8+, .NET Core, Visual Studio
- Experience with async/parallel programming in .NET
- Microsoft Azure (App Service, Functions, Service Bus, Storage)
Skills mentioned
About Primis
Primis is a provider of talent solutions to the technology sector across the UK and US. We are on a mission to work with our clients and educate them on the importance of D&I when it comes to building out teams and organisations. We understand that as a business we are only as good as the people we employ and work with, so we put people first in every decision we make. Get in touch today: London : 0203 854 9777 Manchester: 0161 394 1036 New York : 646 630 8467 hello@primis-talent.com careers@primis-talent.com (we are hiring!)