Application Engineer

Job Description

Application Engineer (Contract)

Phoenix, AZ (On-site)

CornerStone Technology Talent Services is partnering with a public-sector organization on an opportunity for a hands-on Application Engineer to support and enhance an existing, mission-critical production application. This role will work directly within an established codebase and collaborate closely with internal technical and business stakeholders to support day-to-day application needs.

This is a practical, development-focused role suited for someone who enjoys working hands-on in production systems, troubleshooting issues, and implementing incremental improvements rather than designing greenfield solutions.

Role Summary

The Application Engineer will serve as a hands-on technical resource responsible for maintaining, supporting, and enhancing an existing production application. The focus of this role is on full-stack development, application stability, and responsive support, working directly in the code to resolve issues, implement fixes, and deliver targeted enhancements.

This is not a solution architect role. Success in this position depends on strong development fundamentals, comfort working within an established application environment, and the ability to collaborate effectively with internal teams.

Key Responsibilities

• Work directly within an existing production application codebase to troubleshoot issues and implement fixes
• Develop and enhance application features using .NET, Python, and JavaScript
• Write and maintain SQL queries and support relational database interactions
• Support day-to-day application operations and respond to issues as they arise
• Collaborate with internal stakeholders to understand requirements and deliver practical solutions
• Document changes, fixes, and enhancements clearly and accurately
• Follow established development standards, processes, and deployment practices

Required Qualifications

Engagement Details

Pay Rate : Targeting market-aligned contract rates

Contract Duration : Contract engagement with potential for extension

Location : Downtown Phoenix, AZ

Work Model : 100% on-site

Start Timing : Targeting early 2026

Interview Process : Structured interview process consistent with prior engagements

This role offers the opportunity to work in a stable public-sector environment, support a critical application, and contribute immediate value through hands-on development and support.