CNO Developer (iOS) with Security Clearance

Cornerstone Defense LLC; Annapolis (MD); On-site; USD 185,000 - 205,000; Full time

Benefits offered by this job

Medical, Dental and Vision Plans

Generous PTO Policy

401(k)

HSA and FSA options

Life and Disability Insurance

Job summary

Cornerstone Defense LLC in Annapolis Junction, MD seeks a CNO Developer to support mission-critical cyber operations on iOS. You will apply strong iOS internals, reverse engineering, and C/C++ skills in security-focused development.

The role demands OS-level analysis, low-level programming, and work in constrained environments to deliver end-to-end capabilities for SAS efforts.

Qualifications

• Bachelor's degree in CS or related field plus five years of SWE experience in programs/contracts of similar scope, type, and complexity.
• At least 2 years of experience must be in cybersecurity or CNO-specific development.

Responsibilities

• Support mission-critical cyber operations on iOS.
• Analyze complex behaviors and develop advanced capabilities in constrained environments.
• Design, implement, test, and maintain complex capabilities end-to-end.

Skills

iOS internals

Reverse engineering

C/C++ development

Low-level programming

Embedded environments

OS architecture

Education

Bachelor's degree in CS or related

Tools

IDA Pro

Ghidra

Job description

Title: CNO Developer (iOS) Location: Annapolis Junction, MD Compensation Range: $185 -$205K

• Clearance:
• Active TS/SCI w/ Polygraph needed to apply
• Company Overview: 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. Benefits Overview: 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
• CollegeAmerica 529
• Fitness Reimbursement Program
• Travel Assistance
• Norton Lifelock Benefit Solutions
• Life Planning Financial & Legal Services
• Overview: 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. Required Skills:
• 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.
• Desired Skills:
• 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.
• Qualifications:
• 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.