CNO Developer; iOS

Title:

CNO Developer (iOS)

Location:

Annapolis Junction, MD
Compensation Range: $185-205K

Clearance: Active TS/SCI w/ Polygraph needed to apply

Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government. Realizing early on that our most prized assets are our employees, we continually focus our attention on improving the overall work/life experience they have supporting the mission. Our Team is pushed every day to use their industry leading knowledge to provide end-to-end solutions to combat our nation’s toughest and most secure problems.

If you are looking for a place to not only be professionally challenged, but encouraged and supported by a company that cares, don’t look any further than Cornerstone Defense.

Cornerstone Defense offers a very comprehensive benefits package including, but not limited to:
Medical, Dental and Vision Plans
* Generous PTO Policy
* 401(k)
* HSA and FSA options
* Life and Disability Insurance
* Tuition Reimbursement and Training
* Perks at Work Discount Program
* Referral Program
* Leads Generation Program
* College America 529
* Fitness Reimbursement Program
* Travel Assistance
* Norton Lifelock Benefit Solutions
* Life Planning Financial & Legal Services *

We are seeking a highly motivated and technically skilled CNO Developer to join our iOS team supporting mission‑critical cyber operations. The ideal candidate must possess strong software engineering fundamentals, hands‑on experience with iOS internals, and at least two years of cybersecurity or CNO‑focused development. This role supports mission‑driven SAS efforts and requires engineers comfortable working at low levels of the operating system, analyzing complex behaviors, and developing advanced capabilities in constrained environments.

• Strong iOS internals experience, including knowledge of operating system architecture, application lifecycle, security mechanisms, sandboxing, and system‑level behavior.
• Reverse engineering experience using IDA Pro or Ghidra
• Ability to analyze binaries, interpret compiler output, and understand functionality without symbols.
• Proficiency in C and C++ for low‑level, performance‑sensitive, or security‑focused development.
• Experience developing, debugging, and sustaining software in constrained, embedded, or security‑sensitive environments.
• Demonstrated ability to design, implement, test, and maintain complex capabilities end‑to‑end.

• Experience with vulnerability research, exploitation, or mobile‑focused security research.
• Familiarity with kernel‑mode concepts or OS‑level subsystem behavior.
• Experience supporting mission‑focused CNO tool development.
• Comfort working in small, fast‑moving, high‑trust engineering teams.

• Bachelor’s degree in computer science or related discipline from an accredited college or university, plus five (5) years of experience as a SWE, in programs and contracts of similar scope, type, and complexity
• At least 2 years of experience must be in cybersecurity or CNO‑specific development.