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# Senior .Net Software Engineer

- **Company:** VACO LLC
- **Location:** Tempe, AZ, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Application Programming Interfaces (APIs), C Sharp (Programming Language), Code Review, Databases, Continuous Integration, DevOps, Microsoft SQL Server, Scrum Methodology, Standard Sql, Software Engineering, Management of Software Versions, Data Ingestion, Backend, Build Management, Integration Tests, Restful APIs, Api Management, Legacy Systems
- **Published:** August 9, 2026
- **Apply:** https://us.experteer.com/career/view-jobs/senior-net-software-engineer-tempe-az-usa-58872006

## About the Role

by integrations with clear contracts, versioning, error handling, and observability * write unit/integration tests and contribute to CI/CD testing practices * participate in code reviews focusing on performance, maintainability, resiliency, and security * troubleshoot production issues and perform root-cause analysis to improve reliability * collaborate with product, architecture, QA, DevOps, and engineering teams in Agile delivery * mentor junior and mid-level engineers to raise team standards Tasks * 7+ years of professional software engineering experience delivering production systems * Strong backend development experience with C#, .NET, and modern .NET frameworks * Experience modernizing legacy applications or incremental improvements to older systems * Strong SQL database experience (SQL Server or equivalent) * Experience designing and building RESTful APIs and integration layers * Experience with third-party API integrations and multi-source data ingestion * Experience writing aaH
_ and integration tests and working in CI/CD environments * Experience working in Agile/Scrum with cross-functional teams * Strong communication skills to explain technical decisions * Ability to operate as a senior IC and mentor others Key requirements * Base salary up to $150,000 * 10% bonus opportunity * 401(k) with employer match * Generous PTO * Medical, dental, and vision benefits * Discretionary bonuses (as noted)

## Description

Experteer Overview Senior backend-focused role within a Tempe engineering team, driving modernization of core platform applications and legacy systems. You will design and build scalable .NET services and APIs, collaborate with cross-functional partners, and mentor junior engineers to raise engineering standards. The role emphasizes reliable, data-centric systems and integration across multiple data sources and third-party services. On-site presence four days a week enables close collaboration in a high-quality, capable engineering environment. Compensation / Benefits * Design, build, test, and deploy backend services and APIs using C# and .NET * modernize legacy applications by rewriting systems into modern .NET architecture * develop scalable API and integration patterns for data ingestion from multiple sources * work with SQL Server and related database technologies for data-centric apps * translate requirements into production-ready software and document designs * build resilient integrations with clear contracts, versioning, error handling, and observability * write unit/integration tests and contribute to CI/CD testing practices * participate in code reviews focusing on performance, maintainability, resiliency, and security * troubleshoot production issues and perform root-cause analysis to improve reliability * collaborate with product, architecture, QA, DevOps, and engineering teams in Agile delivery * mentor junior and mid-level engineers to raise team standards Tasks * 7+ years of professional software engineering experience delivering production systems * Strong backend development experience with C#, .NET, and modern .NET frameworks * Experience modernizing legacy applications or incremental improvements to older systems * Strong SQL database experience (SQL Server or equivalent) * Experience designing and building RESTful APIs and integration layers * Experience with third-party API integrations and multi-source data ingestion * Experience writing unit and integration tests and working in CI/CD environments * Experience working in Agile/Scrum with cross-functional teams * Strong communication skills to explain technical decisions * Ability to operate as a senior IC and mentor others Key requirements * Base salary up to $150,000 * 10% bonus opportunity * 401(k) with employer match * Generous PTO * Medical, dental, and vision benefits * Discretionary bonuses (as noted)


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