Senior Software Engineer

We are looking to hire a skilled full stack .NET C# developer who can collaborate with the Product Owner, other developers, and test engineers on the team to produce high quality software that delivers business value and follow established design patterns and processes. Ability to independently develop, code or modify, test, and debug application programs of varying degrees of complexity. Ability to prioritize well, communicate clearly, have a consistent track record of delivery and excellent software engineering skills. Creative engineering balanced with high quality and a focus on customers' needs. Must be able to work across multiple facets of the project and juggle multiple responsibilities at the same time. Strong analytic capability and the ability to create innovative solutions. The candidate must be a highly motivated individual who is looking to grow their career in a fast-paced environment. To be successful in this role, you will need extensive knowledge of programming languages and software development life cycle.

Primary Responsibilities:

• Design, develop, enhance, and maintain .NET C# applications, and handle frontend, middleware and backend development procedures.
• Build RESTful APIs and backend services.
• Write clean, scalable, and efficient code.
• Collaborate with cross-functional teams including developers business analyst, and product owner.
• Troubleshoot, debug, and upgrade existing applications.
• Participate in code reviews and maintain coding standards.
• Work with databases to design and optimize queries.
• Ensure application security, performance, and scalability.
• Should draw charts using OpenCities drawing tool.
• Should communicate with Business Process Analyst to understand requirements and complete tasks.
• Should design new application based on existing applications.
• Perform tasks using Oracle database.
• Develop and implement new systems and ensure that their configuration is properly handled.
• Use development best practices, and appropriate patterns to develop required software solutions.
• Create and maintain technical documentation, including user manuals and guides.
• Formulate and define system scope and objectives, based on the individual needs of each user.
• Analyze and revise existing system logic difficulties, and ensure that technical knowledge of all phases of application systems is maintained.
• Perform object-oriented analysis and design and test diligently to ensure optimal performance of all assigned systems and system modules.

Basic Qualifications:

Requires or US Person with the ability to obtain a Public Trust Clearance.

• Bachelor's degree in computer science or related degree is required. Plus 12 years of prior relevant experience or master's degree and 10 years of prior relevant experience.
• Experience delivering entire projects or processes spanning multiple technical areas.
• Deep understanding of software lifecycle.
• Working knowledge of Agile Development and continuous integration and continuous delivery methodologies and tools.
• Strong, self-motivated desire to learn new programming languages, tools, frameworks, and techniques.
• Ability to complete tasking independently with minimal direct supervision.
• Ability to work and collaborate effectively within a multi-disciplined engineering team.
• Experience working with .NET framework
• Experience working with languages (C#, Java)
• Experience working with basic web service technologies (XML, REST, JSON, SOAP)
• Experience working with a version control system (Git) and Bitbucket.
• Experience working with Agile Development methodologies.
• Experience working with at least one Relational Database Management System (Oracle, MySQL, SQL Server, etc.).

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.

Original Posting:
April 9, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:
Pay Range $131,300.00 - $237,350.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.