Senior Full Stack Software Engineer (Full-Time)

Senior Full Stack Software Engineer (Backend-Focused) Location: Philadelphia, PA Employment Type: Full-Time Work Arrangement: Hybrid / On-Site as needed based on project requirements and client approval Client Site: TBD Note: We kindly ask not to be contacted at this time by recruiters or third-party agencies. The Role Mc.

Knight International is seeking a Senior Full Stack Software Engineer with a strong backend focus to support the enhancement and modernization of a mission-critical financial system. This is a backend-focused role and requires strong, hands-on development in C# and .NET Core. The role focuses on building, optimizing, and maintaining SQL Server-driven systems that support financial operations and reporting.

The ideal candidate will be able to step into a complex environment and contribute immediately, working across backend services, data processing, and system integrations while supporting ongoing modernization efforts.

Requirements

Leadership Scope Serve as a hands-on technical contributor supporting backend development and system modernization Participate in internal and client-facing discussions related to system enhancements and priorities Contribute to backend architecture, including APIs, data workflows, and system integrations Support continuous improvement of system performance, reliability, and scalability Essential Job Functions Design, develop, and maintain backend applications using C# and .

NET Core Build and integrate RESTful APIs across internal and external systems Develop and optimize SQL Server databases, including: Stored procedures Complex queries Data processing workflows Support and enhance a financial system with high data volume and operational complexity Perform unit testing, integration testing, and participate in code reviews Support application deployments, troubleshooting, and production stability Participate in Agile ceremonies including stand-ups, sprint planning, and retrospectives Collaborate with cross-functional teams including business analysts, project managers, and infrastructure teams Translate business requirements into scalable backend solutions Supplemental Functions Communicate effectively with both technical and non-technical stakeholders Support performance optimization across applications and databases Contribute to system documentation and knowledge sharing Troubleshoot and resolve complex backend and data-related issues Qualifications 5+ years of experience in software development with a strong backend focus Strong, recent experience with C# and .

NET Core (last 1–2 roles) Strong experience with Microsoft SQL Server, including: Stored procedures Performance tuning Data-heavy backend systems Experience developing and integrating REST APIs Experience working within enterprise or financial systems environments Experience with microservices architecture preferred Experience working in Azure environments preferred Strong analytical, problem-solving, and communication skills Nice-to-Have Experience Experience with financial systems or reporting platforms Experience supporting legacy system modernization initiatives Experience working in regulated or compliance-driven environments Certifications & Education Bachelor’s degree in Computer Science, Software Engineering, Information Systems, or related field required Equivalent experience may be considered Physical, Schedule & Eligibility Requirements Full-time position Hybrid/on-site presence required based on project needs and client approval Must be authorized to work in the United States Reliable transportation to and from assigned work location(s) required Salary Annual base salary range (Philadelphia market): $90,000–$140,000, with final compensation based on experience, technical skill level, and project requirements, in compliance with applicable federal, state, and local pay equity laws.

Benefits

Competitive salary Medical, dental, and vision benefits 401(k) with employer matching contribution Paid time off (PTO) and company holidays Professional development and certification support Collaborative and growth-oriented work environment