Freelance C# Winforms Developer Jobs (NOW HIRING)

The Undersea Systems Division (USD) at Leidos is seeking a Software Engineer to join a fast-paced, highly collaborative team developing and rapidly prototyping advanced ocean technologies. In this role, you will work closely with a multidisciplinary group of engineers to design custom software tools, integrate new technologies, and support hands-on testing of mission-critical sensor systems. Our projects span the full development lifecycle-from concept exploration and iterative design to lab evaluation and at-sea demonstrations.

This role is performed fully on-site at NIWC PAC Bayside in San Diego, CA, and follows a 9/80B schedule aligned with customer operations.

Primary Responsibilities

• Lead the development and maintenance of software tools that support testing and evaluation of mission-critical undersea sensor systems.
• Collaborate with cross-functional engineering teams to design, integrate, and assess new and emerging sensor technologies.
• Identify opportunities to adopt and integrate new technologies that improve software development workflows, testing capabilities, and automation.
• Support laboratory and field testing of deliverable systems, including troubleshooting, validation, and data analysis.
• Conduct periodic at-sea testing aboard small vessels and assist with postprocessing and interpretation of collected data.

Basic Qualifications

• U.S. Citizen with the ability to obtain a SECRET security clearance.
• Bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, or related STEM field and 2-4 years of relevant experience; or a Master's degree with 0-2 years of experience.
• Professional software development experience with proficiency in C# (.NET Framework).
• Working knowledge of C/C++ for hardware-focused or embedded applications.
• Proven experience with multithreading and asynchronous programming.
• Experience developing software interfaces for hardware such as DAQ systems, sensors, actuators, or custom test equipment.
• Familiarity with communication protocols including Serial/RS232, I2C, SPI, or Ethernet/TCP-IP.
• Competence with standard laboratory equipment (oscilloscopes, DMMs, power supplies).
• A proactive, hands-on troubleshooting approach-comfortable transitioning between IDEs, lab benches, and field environments.
• Ability to translate complex technical challenges into clear requirements and communicate solutions to both technical and non-technical stakeholders.

Preferred Qualifications

• Active SECRET security clearance.
• Experience developing tools for data collection, automation, or system monitoring.
• Experience with Python and scientific/analysis libraries such as NumPy, SciPy, and Pandas.
• Experience developing desktop GUI applications (e.g., WPF, WinForms).
• Familiarity with Git-based version control workflows.
• Experience using advanced electronic test equipment such as spectrum analyzers and oscilloscopes.

Work Environment & Physical Requirements

While most work is performed in an office or laboratory setting, this role occasionally requires:

• Working aboard marine vessels in varying weather and temperature conditions.
• Moving through piers, docks, and industrial facilities, including stooping, kneeling, or reaching for extended periods.
• Operating tools, instrumentation, and computer equipment using hands and fingers.
• Lifting or transporting objects weighing up to 50 lbs.

SUBSEAMSS

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.

The Leidos pay range for this job level is a general guideline onlyand 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.