iOS Developer

• Must have an active U.S. Government Top Secret (TS) clearance, Full Scope Polygraph (FSP), or the ability to obtain one
• Must have at least 10+ years of experience
• Experience developing, testing, and debugging in Python and C
• Experience building UNIX applications using make files (or similar build environments) on mission-relevant platforms
• Experience developing CNO tools and techniques
• Strong socket programming and packet-level understanding of IP, TCP, and application-layer protocols
• Proficiency in tracing execution with debuggers/tools such as WinDbg, gdb, IDA Pro
• Experience reverse engineering native binaries
• Experience developing proof-of-concept exploit software

• Knowledge of OS internals, including topics such as: *

• runtime linker/loader concepts
• object file formats (e.g., ELF)
• file system internals (e.g., NTFS, ext2, btrfs)
• access control mechanisms (MAC/DAC)
• process/thread APIs, data structures
• Understanding of modern mitigations (ASLR, DEP, NX), approaches to bypass them, and methods to detect bypass attempts
• Experience with version control (e.g., git, GitLab)

What we’d like you to have

• Native-level mobile development experience (Android native/NDK or similar)
• Vulnerability analysis experience
• Assembly familiarity, preferably ARM
• Understanding of mobile security protections (e.g., SELinux, application sandboxing)
• Experience with Objective-C, Swift, C++
• Ability to work independently and collaboratively in a fast-paced environment with changing priorities

BigBear.ai is seeking an iOS Developer to join a mission-focused cyber team supporting critical national security objectives. In this role, you’ll build and sustain custom Android capabilities used by operational teams in fast-moving, real-world environments. You’ll work side-by-side with end users to understand evolving needs, translate them into technical solutions, and deliver reliable tools that perform under pressure. This is a hands-on engineering position with end-to-end ownership from initial design through development, testing, debugging, documentation, and ongoing enhancements, where speed, quality, and mission impact matter.

What you will do

• Design and develop custom software tools and techniques for the Android platform
• Own end-to-end development: requirements, design, implementation, testing, and sustainment
• Diagnose and debug issues using COTS/GOTS tools and internal frameworks
• Apply a strong understanding of networking concepts and protocols to tool development
• Produce documentation needed to operate, maintain, and support delivered software
• Mentor and guide junior developers to accomplish mission objectives
• Respond to and solve time-sensitive, real-world cyber problems, BigBear.ai is a leading provider of AI-powered decision intelligence solutions for national security, supply chain management, and digital identity. Customers and partners rely on Bigbear.ai’s predictive analytics capabilities in highly complex, distributed, mission-based operating environments. Headquartered in McLean, Virginia, BigBear.ai is a public company traded on the NYSE under the symbol BBAI. For more information, visit and follow BigBear.ai on LinkedIn: @BigBear.ai and X: @BigBearai.