Senior Software Engineer

Key Responsibilities

• Collaborate with Product Owner, Business Analyst, Scrum Master, Architecture, and business partners to refine user stories and delivery plans
• Design, develop, and maintain integrations, enhancements, and bug fixes
• Write production-quality code aligned with security, performance, and coding standards
• Build and update features for complex, distributed, n-tier systems
• Review API documentation to identify requirements, gaps, and risks; contribute to estimation and planning
• Implement and validate unit tests using established frameworks
• Contribute to RESTful service integrations and public API consumption
• Develop tools and practices that increase team efficiency and delivery quality
• Mentor junior engineers and provide technical guidance and troubleshooting support
• Identify risks/impediments early and propose contingency plans

Top Requirements

• 5+ years of professional software engineering experience with C# / .NET (Visual Studio) and SQL
• Strong understanding of Object-Oriented Design and SOLID principles
• Hands-on experience with RESTful APIs, web services, and integration development (building and consuming public APIs)
• Proficiency with async programming, multi-threading, and serialization
• Experience with unit testing (MS Test, NUnit, or xUnit)
• Working knowledge of Agile/Scrum and tooling such as Azure DevOps, CI/CD, Git, and NuGet
• Experience with distributed / n-tier application architecture
• Familiarity with authentication, design patterns, and API documentation review
• Experience with Windows desktop application development and Windows workflow
• Ability to work with HTML, XML, and JSON

About the Role

You’ll help design, build, and enhance integrations that improve customer-facing capabilities. Working closely with Product, Business Analysis, Architecture, Scrum leadership, and business partners, you’ll translate requirements into user stories, deliver secure and reliable software, and continuously improve engineering practices.

About Seneca Resources

At Seneca Resources, we are more than just a staffing and consulting firm—we are a trusted career partner. With offices across the U.S. and clients ranging from Fortune 500 companies to government organizations, we provide opportunities that help professionals grow their careers while making an impact. When you work with Seneca, you’re choosing a company that invests in your success, celebrates your achievements, and connects you to meaningful work with leading organizations nationwide. We take the time to understand your goals and match you with roles that align with your skills and career path. Our consultants and contractors enjoy competitive pay, comprehensive health, dental, and vision coverage, 401(k) retirement plans, and the support of a dedicated team who will advocate for you every step of the way.

Benefits

Seneca Resources is proud to be an Equal Opportunity Employer, committed to fostering a diverse and inclusive workplace where all qualified individuals are encouraged to apply.