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Software Engineer - Full Stack/ C#.

Software Engineering & Dev Full-Time

Software Engineer - Full Stack/ C#: our view in 3 lines...

  • The Role:This role is for a software engineer working on embedded firmware and software systems with hardware interaction.
  • The Person:The person will design, implement and test firmware and software systems, maintain design and test documentation, collaborate with Hardware Engineers, and mentor Associate Engineers and Technicians.
  • Requirements:The role calls for a B.S. in Electrical Engineering or Computer Science, 2+ years of experience, C and assembly languages, C++, C#, Delphi, Java, C, Python, and embedded Linux systems development.

About the role

Responsibilities

  • Participate in the design, implementation, and test of firmware/software systems.
  • Understand hardware and software interactions, and collaborate with Hardware Engineers.
  • Prepare and maintain designs and test documentation.
  • Mentor Associate Engineers and Technicians.
  • Follow and apply SEL Values, Principles of Operations, and World Class Manufacturing Principles.

Required Qualifications

  • B.S. in Electrical Engineering, Computer Science, or equivalent
  • Typically 2+ years experience in one or more of the following areas:
    -- Embedded systems firmware development including:
    - Real-time firmware design
    - C and assembly languages
    -- Graphical User Interface applications in Windows environments including:
    - Object oriented design
    - Object oriented languages (C++, C#, Delphi, Java)
    -- Embedded Linux systems development including:
    - C, C++, Python
    - Other scripting languages
  • Strong writing, documentation, and speaking skills
  • Ability to learn new skills and assume new responsibilities
  • Ability to work cooperatively in a team environment

Preferred Qualifications

  • Industrial controls
  • 3-phase electric power systems
  • Modern communications protocols
  • Digital and analog circuitry
  • Digital communications and signal processing
  • Project management

Competitive pay. Superior benefits. Inspiring work.

People are at the core of our company and we hire employee-owners. We welcome you to learn more about how we support employees.

  • We’re 100% employee owned. Retirement benefits include an employer funded stock ownership plan (ESOP) and personal 401(k) options.
  • We offer top tier medical, prescription, dental, vision, life, and disability insurance.
  • We recognize the importance of a healthy life balance and offer: 10 paid holidays, annual vacation accrual starting at 12 days, 9 paid sick days, and paid family and medical leave that covers 90% of your pay.
  • We foster growth and development of our employees through avenues such as STEM courses, apprenticeships, tuition assistance, and engineering development programs.  
  • Ask our team about other benefits including wellness, fertility, adoption, and flexible spending benefits.

 Pay Range Data

Associate Software Engineer: $81,300 - $122,000

Software Engineer: $89,400 - $134,100

We are open to reviewing additional candidates with more or less experience and the pay range may differ if filled at a different level. Our pay ranges are determined by job and responsibility. We base our starting pay offer and title on job-related factors such as candidate experience, training, knowledge, and skills

Communication with Applicants 

We communicate with all applicants. If you do not receive a response about your application, please check your SPAM filter or reach out to us at careers@selinc.com.

SEL is an Equal Opportunity Employer: Vets/Disabled.

Published September 30, 2026
Location Washington, DC
Job Type Full-Time