Mid-Tier Application and Database Developer

About this role

About Us

AGE Solutions is a premier technology and professional services company, providing in-depth consulting, advanced technology solutions, and essential services throughout the U.S. government, defense, and intelligence sectors. Prioritizing innovation and client-focused solutions, we assist major agencies in addressing intricate issues and ensuring a more secure future.

AGE is seeking a Software Developer with strong C# and database expertise to join our development team. This role focuses on building and maintaining robust middle-tier services and data-driven applications. The candidate will work closely with cross-functional teams to design, develop, maintain and optimize scalable backend systems that power critical business functionality.

The ideal candidate combines solid middle-tier development experience with deep database development knowledge and a strong understanding of system design, performance, maintainability, and data integrity.

This role is hybrid in Philadelphia, PA, requiring onsite reporting at the customer’s facility at least 1 day/week. Candidates must reside within a commutable distance of Philadelphia, PA in order to work onsite as required.

Responsibilities Include:

• Design, develop, and maintain middle-tier services and backend components using C# and .NET technologies.

• Apply SOLID principles and clean architecture practices in application design.

• Build robust APIs and business logic layers to support web and enterprise applications.

• Collaborate with front-end developers, architects, and DevOps teams to deliver integrated solutions.

• Design, develop, optimize, and maintain relational databases (Oracle preferred).

• Write efficient stored procedures, views, functions, and complex queries.

• Optimize database performance, indexing strategies, and query tuning.

• Participate in code reviews and enforce best practices for clean, maintainable code.

• Troubleshoot and resolve production issues related to application logic and data layers.

• Contribute to architectural decisions and technical design discussions.

• Document technical designs and implementation details.

Required Skills, Qualifications and Experience:

• BA/BS in technical discipline.

• 10 years of experience in middle-tier and database development.

• Experience in applying SOLID principles and object-oriented design patterns.

• Strong proficiency in C# and .NET (.NET Core/.NET 6+) and ASP.NET Web API.

• Experience designing and building RESTful APIs and middle-tier services.

• Experience with ORM frameworks (Entity Framework preferred, Dapper).

• Strong SQL skills and experience with relational databases (Oracle preferred, SQL Server, PostgreSQL).

• Experience writing and optimizing complex queries and stored procedures.

• Strong understanding of data modeling and database design principles.

• Experience with version control systems (TFVC and Git).

• Strong problem-solving skills and attention to detail.

• Must be a United States citizen with a DoD Secret clearance or ability to obtain a favorably adjudicated T3 investigation.

Preferred Qualifications:

• Experience with microservices architecture

• Experience with CI/CD pipelines and DevOps best practices

• Experience with cloud platforms (Azure preferred)

• Experience with caching strategies (Redis, in-memory caching)

• Experience with performance profiling and monitoring tools

• Experience with containerization (Docker, Kubernetes)

• Experience with automated testing frameworks

Work Environment and Physical Demand:

• Must be able to work for extended periods of time at a computer.

Compensation: $115,000+
At AGE Solutions, we reward performance, invest in growth, and share success. Our benefits support the whole person, professionally, financially, and personally.

• 26 Days Paid Leave: Includes vacation, sick, personal time, and holidays. You choose how to use it.

• Performance Bonuses: Performance bonuses are awarded based on individual contributions and company-wide results, aligning recognition with impact.

• 401(k) with Match: We match 3% of your contributions with immediate vesting.

• Financial Protection: Company-paid life insurance up to $300K and options for additional coverage for you and your dependents.

• Health Benefits: Multiple medical plans, dental, vision, FSA and HSA options to fit your needs.

• Parental Leave: 15 days of fully paid leave for new parents, because family matters.

• Military Differential Pay: We…