Senior Software Engineer (Hybrid – Minnesota)

SkyWater Search Partners; Saint Paul (MN); On-site; USD 135,000 - 165,000; Full time

Job summary

SkyWater Search Partners partners with a PE-backed technology company to hire a Senior Software Engineer responsible for backend systems and APIs behind internal and customer-facing platforms.

You'll work in C# and .NET, design RESTful APIs to OpenAPI standards, own architecture, code quality, and mentor growing engineers. This hands-on role offers real ownership and collaboration with internal teams and external partners as the platform modernizes.

Qualifications

• 5+ years of professional software development experience.
• Strong backend development experience in C#.
• Experience building APIs to OpenAPI standards.

Responsibilities

• Design, build, and maintain scalable backend services and APIs using C#.
• Develop RESTful APIs documented to OpenAPI (Swagger) standards.
• Collaborate with internal teams and external partners on modernization.
• Mentor and support other engineers.
• Troubleshoot and resolve production issues.
• Contribute to architecture, modernization, and code quality initiatives.

Skills

C#

.NET

API design

RESTful APIs

OpenAPI/Swagger

Backend development

Mentoring

Communication

Tools

ASP.NET

SQL Server

Swagger

Job description

• Job Tag:
• Posted: August 18,2026
• Salary: $150,000

SkyWater has partnered with a PE-backed technology company in hiring a Senior Software Engineer to help design, build, and scale the backend systems and APIs behind its internal and customer-facing platforms. You would work in C# and .NET, build RESTful APIs against OpenAPI standards, and partner closely with both internal teams and external technology partners as the company modernizes its platform. This is a hands-on engineering role with real ownership over architecture and code quality, plus the chance to mentor other engineers as the team grows.

Responsibilities

• Design, build, and maintain scalable, high-performance backend services and APIs using C#
  -Develop RESTful APIs documented to OpenAPI (Swagger) standards
  -Use AI-powered development tools to support efficient, high-quality software delivery
  -Optimize application performance, reliability, and scalability
  -Build and maintain integrations with internal systems and external partners
  -Contribute to architecture, modernization, and code quality initiatives
  -Troubleshoot and resolve complex production issues
  -Collaborate closely with business stakeholders and external partners
  -Mentor and support other engineers

Desired Skills And Experience

• 5+ years of professional software development experience
  -Strong backend development experience in C#
  -Proven ability to build scalable, performant systems
  -Experience building APIs to OpenAPI standards
  -Excellent problem solving skills
  -Strong written and verbal communication, including with external partners
  -React experience is a plus, not required