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Job Details

Senior C Developer


Senior Developer


San Diego, California, United States


Are you looking to make a difference? Leidos in San Diego, CA is looking for a Sr. C Developer to join our team supporting Crypto and Space-Based initiatives.

We welcome all those who have big ideas, crave innovation, and have the passion to bring the warfighter home safe. With a 9/80 schedule, and every other Friday off, our flexible work environment provides you a chance to change the world without giving up your personal life. This is your chance to join a dynamic team working across multiple disciplines with opportunities to further expand your knowledge and grow your career.

Sound like a team you want to be a part of? Come join our mission!

Primary Responsibilities

Leidos is seeking a C Developer to join our team. The successful candidate will work across a variety of Cryptographic and Space-Based development initiatives performing development in C. Contributions include researching, designing, prototyping and developing solutions for cryptographic devices. These security-focused solutions enable the warfighters mission and safety. Activities include:

  • Develop performant software in resource-constrained environments
  • Perform full software development lifecycle, including design, development, testing / automation, and integration
  • Develop interfaces to high assurance crypto modules

This team operates in an Agile Scrum development environment and uses sound software engineering, object oriented, and functional programming principles to ensure that developed code has high quality, is maintainable, efficient, reliable, understandable, secure and fault tolerant. As a C Developer you will support the software configuration management process and understand software components and their interface requirements with other APIs and host systems (i.e., virtualized, containerized, or hardware). This position requires someone who is proactive and passionate about ensuring the quality of software deliverables and can communicate with the development teams (including Leidos, subcontractors, and customer representatives) what is required to achieve this effectively on diverse tasks.

What you will like about this position…

  • Being part of an amazing team of professionals all passionate about the vision of the product and the positive impact it provides to our many customers.
  • Implementing a wide variety of forward leaning technologies and the use of powerful industry-standard development tools and practices.


  • Position requires a current/active Secret DoD security clearance.
  • BS Degree in Computer Science, Cryptography, Applied Mathematics, or similar domain experience.
  • 8-10 years’ Experience in programming and development with C
  • A core understanding and experienced with coding cryptographic and other low-level algorithms
  • Developer experience with Linux O/S environment and operation
  • Kernel module programming for Linux
  • Boot processing including file system (data at rest) encryption
  • Key generation/derivation functions (KDS)
  • Use and implementation of hashing algorithms
  • Auditing and audit protection and verification mechanisms
  • Experienced at developing code from a detailed set of requirements and designs.
  • Ability to appropriately document software during development.
  • This position will require secret classified development.
  • Works well in a team environment and has excellent written and communication skills.

DoD 8570 approved security certification (e.g., Security +) (Will be required within 90 days after hire – opportunities for Leidos-provided training).

Preferred (some subset of the following):

  • Experience in Scrum Methodology or other Agile practices.
  • Experience with Mobile Application Development.
  • Experience with low-level C programming as well as Object-oriented languages (C++, Java, .etc)
  • Experience with Software CM (e.g., Subversion, Git, GitLab, GitHub).
  • Experience with Agile Management Tools and Concepts (e.g., VersionOne, JIRA, Rally, etc.).
  • Understanding of Crypto Development or Cryptographic Key Management:
  • Understanding of Security requirements and implementation including:
    • Windows and Unix security architectures
    • Public Key Infrastructure with trust chains, certificates, revocation checking, cert validation.
    • Cryptographic mechanisms such as SHA, HMAC, Elliptic Curve, and quantum resistance approaches
    • Cryptographic Message Syntax (CMS)
    • Security frameworks adhering to STIGs, RMF

The right candidate will exhibit the following:

  • Quality - demonstrates accuracy, thoroughness, and attention to detail at all times; Looks for ways to improve and promote quality; Applies feedback to improve performance; Monitors own work to ensure quality.
  • Technical Skills - Pursues training and development opportunities; Strives to continuously build knowledge and skills; Shares expertise with others.
  • Initiative - Volunteers readily; Undertakes self-development activities; Seeks increased responsibilities and takes ownership of tasks at hand; Takes independent actions and calculated risks; Looks for and takes advantage of opportunities; Asks for and offers help when needed.
  • Quantity - Meets productivity standards; Completes work in timely manner; Strives to increase productivity; Works quickly.
  • Dependability - Follows instructions, responds to management direction; Takes responsibility for own actions; Keeps commitments; Completes tasks on time or notifies appropriate person with an alternate plan.
  • Innovation - Displays original thinking and creativity; Meets challenges with resourcefulness; Generates suggestions for improving work; Develops innovative approaches and ideas; Presents ideas and information in a manner that gets others' attention.
  • Teamwork - Balances team and individual responsibilities; Exhibits objectivity and openness to others' views; Gives and welcomes feedback; Contributes to building a positive team spirit; Puts success of team above own interests; Able to build morale and group commitments to goals and objectives; Supports everyone's efforts to succeed.

Original Posting Date:


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 $122,200.00 - $220,900.00

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.