CNO iOS Engineer — TS/SCI w/ Poly (Mission-Critical)

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)

Job summary

Cornerstone Defense LLC is seeking a highly skilled CNO Developer (iOS) in Annapolis Junction, MD. The role requires strong iOS internals knowledge, low-level development skills in C/C++, and hands-on reverse engineering.

You will work on mission-critical cyber operations, analyzing binaries and OS behavior in constrained environments. Minimum qualifications include a Bachelor's in CS or related field and at least two years in cybersecurity or CNO-focused development, with TS/SCI w/ Polygraph

Qualifications

• Strong iOS internals experience, including OS architecture, lifecycle, security, sandboxing.
• Reverse engineering experience using IDA Pro or Ghidra.
• Proficiency in C and C++ for low-level, security-focused development.
• At least 2 years in cybersecurity or CNO-specific development.

Responsibilities

• Develop, test, and sustain CNO-focused iOS capabilities end-to-end.
• Analyze binaries and OS behavior in constrained environments.
• Support mission-driven SAS efforts and security-focused tooling.

Skills

iOS internals

Operating system architecture

Security mechanisms

Sandboxing

Reverse engineering

C

C++

Debugging

Low-level development

Education

Bachelor's degree in computer science or related discipline

Tools

IDA Pro

Ghidra

Job description

Cornerstone Defense LLC is seeking a highly skilled CNO Developer (iOS) in Annapolis Junction, MD. The role requires strong iOS internals knowledge, low-level development skills in C/C++, and hands-on reverse engineering.

You will work on mission-critical cyber operations, analyzing binaries and OS behavior in constrained environments. Minimum qualifications include a Bachelor's in CS or related field and at least two years in cybersecurity or CNO-focused development, with TS/SCI w/ Polygraph