Senior Software Engineer

RETR is a profitable B2B SaaS company focused on providing data intelligence for mortgage professionals. They are seeking a Senior Software Engineer to design, develop, and maintain scalable ASP.NET Core applications and REST APIs, while contributing to architecture discussions and collaborating with a small team.

Responsibilities:

• Design, develop, and maintain scalable ASP.NET Core applications and REST APIs across a layered (WebUI → Services → Repositories → NHibernate → SQL Server) architecture
• Collaborate with product managers, designers, and engineers to define requirements and technical specifications
• Lead architecture discussions and contribute to decisions on scalability, performance, and system design
• Build and maintain background jobs with Hangfire, integrations with Stripe, Twilio, SendGrid, and Azure services
• Troubleshoot and resolve complex technical issues in production and development environments
• Participate in Agile development
• Stay current on emerging technologies and evaluate their potential impact on the platform

Requirements:

• 5+ years of professional experience with C# and .NET (Core / .NET 5+)
• Strong understanding of RESTful API design, layered architecture patterns, and ORM frameworks (NHibernate, EF Core, or similar)
• Solid SQL Server experience — complex queries, schema design, and performance tuning
• Comfortable working across the stack: backend services, Razor/MVC views, and JavaScript (jQuery/Bootstrap)
• Experience with Azure services (Blob Storage, Key Vault, SignalR) or equivalent cloud platforms
• Strong source control practices (Git), code review, and DevOps experience
• A creative problem solver with strong listening, logic, and critical thinking skills
• Team player with a passion for helping others succeed and a commitment to doing the right thing
• Experience with authentication patterns (JWT, cookie auth, SAML2, OpenID Connect)
• Mobile app development experience