Software Integration Engineer III/IV

Position Summary 

At Zone5 Technologies, we’re redefining what’s possible in unmanned aircraft systems. Our team of engineers and innovators is developing cutting-edge autonomous solutions that push the boundaries of UAS technology — solving complex challenges that matter. 

We’re building the future of UAS capabilities, and we’re looking for exceptional talent to join us. If you’re driven by hard problems, energized by rapid innovation, and ready to make an impact on next-generation flight systems, you belong here. 

The Software Integration Engineer III–IV is a senior individual contributor role responsible for owning system interfaces and integrating subsystems so they communicate reliably with one another. The engineer will integrate flight software, avionics, sensors, payloads, datalinks, ground systems, and vendor equipment; verify interfaces through laboratory, ground, and flight testing; and work closely with GNC, avionics, software, systems, and flight test teams to ensure safe and reliable aircraft performance. Engineers at this level are the technical authority for the interfaces they own. 

The ideal candidate combines: 

• Interface Control Documents (ICDs) & Interface Requirements 

• System & Subsystem Integration 

• Communication Protocols & Data Buses (Ethernet, Serial, CAN, MIL-STD-1553, ARINC 653, WOSA) 

• Messaging Middleware (DDS, ROS2, MAVLink) 

• Interface Verification & Validation (V&V) 

• Hardware-in-the-loop (HITL) & Software-in-the-loop (SITL) 

• Network & Bus Analysis 

• Systems Engineering & Requirements Management 

• Test Automation 

• Root Cause Analysis 

Level Expectations 

Level III (5+ years of experience) 

• Owns multiple subsystem interfaces end to end, from ICD definition through implementation, verification, and configuration control. 

• Authors and maintains ICDs and negotiates interface agreements with internal teams and external vendors. 

• Plans integration sequences and interface test campaigns and defines pass/fail criteria. 

• Leads root cause investigations for complex, cross-subsystem interface anomalies. 

• Provides technical guidance and peer review to junior engineers. 

Level IV (8+ years of experience) 

• Serves as interface authority for a full platform or across multiple platforms, owning the overall interface architecture and system data flow. 

• Defines interface standards, messaging architecture, and versioning and compatibility strategy used across products. 

• Leads integration of third-party, customer, and government-furnished systems and represents interfaces design reviews and customer engagements. 

• Resolves the most ambiguous, high-risk integration problems and mentors engineers at all levels. 

Responsibilities 

Interface Ownership 

• Own system and subsystem interfaces across flight software, avionics, sensors, payloads, datalinks, and ground control systems. 

• Collaborate with systems engineering to author, maintain, and configuration-control ICDs, interface requirements, message definitions, and data dictionaries. 

• Coordinate interface changes with internal teams, vendors, and customers. 

• Define interface architecture, including protocols, message sets, rates, timing, and error handling. 

• Assess the impact of proposed interface changes and manage versioning and backward compatibility. <