Mid-Tier Application and Database Developer

Age Solutions

Philadelphia (Philadelphia County)

Hybrid

USD 103,500 - 126,500

Full time

14 days+

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Benefits offered by this job

26 Days Paid Leave

Performance Bonuses

401(k) with Match

Company-paid life insurance

Health Benefits

Parental Leave

Professional Growth

Military Differential Pay

Shared Success

Job summary

Age Solutions is seeking a Mid-Tier Application and Database Developer in Philadelphia to design, develop, and maintain backend services using C# and .NET. The candidate should have 10 years of experience, strong SQL skills, and a BA/BS in a technical discipline. The role involves collaboration with cross-functional teams and optimizing database performance. The position offers a hybrid work model in Philadelphia with benefits including 26 days paid leave and performance bonuses.

Qualifications

10 years of experience in middle-tier and database development.
Strong proficiency in C# and .NET (.NET Core/.NET 6+) and ASP.NET Web API.
Experience designing and optimizing complex SQL queries and stored procedures.

Responsibilities

Design, develop, and maintain middle-tier services and backend components using C# and .NET technologies.
Collaborate with front-end developers and DevOps teams to deliver integrated solutions.
Document technical designs and implementation details.

Skills

Database development

SOLID principles

API design

SQL

Object-oriented design

Version control (Git)

Education

BA/BS in technical discipline

Tools

Entity Framework

Dapper

Oracle

PostgreSQL

Docker

Kubernetes

Job description

Mid-Tier Application and Database Developer

life insurance, parental leave, tuition reimbursement, 401(k)

United States, Pennsylvania, Philadelphia

Apr 11, 2026

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 bridge the gap for employees on active duty, so they don't take a financial hit while serving.
Professional Growth: Paid training and certifications, tuition reimbursement, and the tools and tech to get the job done right.
Shared Success: In the event of a company sale, our CEO has committed to returning 80% of net proceeds to employees. This ensures our team shares in the long term value they help create.