Senior Software Developer (Microsoft C#)

Senior Software Engineer

Merrifield, VA | Onsite – USPS Engineering Systems

Build the software that powers a national institution

MBA Consulting Services, Inc. (MBA CSi) is supporting a long-term, multi-year engagement with the U.S. Postal Service—and we’re seeking a Senior Software Engineer to join the USPS Software Engineering team in Merrifield, VA.

As an MBA CSi employee, you’ll work onsite at USPS Engineering Systems Headquarters, designing and delivering modern, enterprise-scale software solutions that enhance and re-engineer mission-critical USPS systems. This role is well-suited for a seasoned engineer who thrives in complex environments and enjoys modernizing legacy platforms using proven, scalable technologies.

What You’ll Do

• Design, develop, modify, and implement software applications across enterprise systems

• Participate in the full Software Development Life Cycle (SDLC)—planning, designing, and coordinating development efforts

• Support and install software applications and operating systems

• Provide hands-on technical support to project and development teams

• Apply creativity and technical judgment in fast-paced R&D environments

• Collaborate closely with team members and stakeholders to ensure clear understanding of requirements and deliverables

• Report to the development team lead while contributing as a senior technical resource

Education & Experience

• Bachelor’s degree (preferably in a related technical discipline)

• 8+ years of professional experience in software engineering or a related field

Technical Skills & Requirements

• Strong experience with C# and the .NET platform

• Web application and web services development, including XML and JSON

• Proficiency using Microsoft Visual Studio with Team Foundation Server (TFS) for source control

• Experience with C#.NET database interface design and SQL commands

• Hands-on experience with C# WinForms, including kiosk-style applications

• Experience with multi-threaded C# application design

• Familiarity with Microsoft Entity Framework (preferred)

• Experience working in Windows environments (Windows 10, Windows Server)

• Familiarity with WPF and modern UI technologies (preferred)

• Exposure to UI accessibility standards, including Section 508 compliance, is a plus

• Experience integrating with system interfaces, including APIs and Kafka

• Knowledge of additional programming languages or hardware driver development is a plus

• Ability to demonstrate current or recent work is preferred

• Must pass a pre-employment background check and drug test