Cellular Protocol & Software Engineer Crane, Indiana

Precise Systems delivers integrated, mission-ready solutions that advance warfighter readiness and strengthen our nation’s most critical defense programs. Through the power of our combined capabilities, we provide deep expertise in Advanced Engineering;
Digital Transformation;
Electromagnetic Warfare;
Interactive Training & Simulation;
Physical Sciences Research;
Platform Lifecycle Support; and Foreign Military Sales. Unified by decades of trusted performance and expanded through strategic growth, our team applies innovative technologies, engineering rigor, and customer-focused execution to solve complex challenges and accelerate mission success. Guided by our commitment to partnership, precision, and performance, we deliver the scalable solutions and technical excellence our customers depend on—today and into the future.

Precise Systems is seeking a Cellular Protocol & Software Engineer to support NSWC Crane's Expeditionary Electromagnetic Warfare mission. This position focuses on the analysis, development, implementation, and testing of 3G, LTE, and 5G cellular protocols in laboratory, simulated, over-the-air, and field environments. The engineer must be able to analyze cellular communications beyond RF spectrum observations by breaking down protocol signaling, message exchanges, information elements, state transitions, and interactions between protocol layers.

This is not a traditional cellular network optimization or RF performance-monitoring role. This position requires in-person support.

• Analyze 3G, LTE, and 5G protocol stacks, signaling flows, message exchanges, state transitions, and protocol behavior at the packet and message level.
• Decode and evaluate cellular control-plane and user-plane signaling, including interactions among RRC, NAS, PDCP, RLC, MAC, and PHY layers.
• Analyze 3
  
  GPP procedures such as registration/attach, authentication, security establishment, session setup, mobility, handover, and connection management.
• Identify protocol fields, information eements, timing relationships, implementation differences, abnormal behavior, edge cases, and potential vulnerabilities.
• Develop, modify, debug, and maintain software in C, C++, and Python to generate, emulate, manipulate, or test cellular protocol behavior.
• Capture, decode, inspect, and troubleshoot cellular signaling and packet traffic using protocol-analysis, packet-analysis, cellular diagnostic, or comparable engineering tools.
• Develop and execute structured test cases that exercise specific protocol states, message sequences, malformed conditions, implementation behavior, and performance characteristics.
• Support software-defined, simulated, laboratory, over-the-air, and field test environments used to reproduce, stimulate, or assess cellular protocol behavior.
• Correlate RF observations and waveform characteristics with protocol-layer activity to support technically defensible analysis and test conclusions.
• Prepare test procedures, technical reports, protocol analyses, vulnerability findings, briefings, and engineering recommendations for Government review and decision-making.

• Bachelor's degree in Computer Engineering, Electrical Engineering, Electronics Engineering, or Mathematics with a concentration in computer science

• Minimum of three (3) years of professional experience in computer design, software development, or computer networks
• Demonstrated hands-on experience analyzing or developing cellular protocols at the protocol-stack, signaling-message, or packet level.
• Working knowledge of 3
  
  GPP cellular architecture and LTE/5G protocol behavior, including RRC, NAS, PDCP, RLC, MAC, and PHY interactions.
• Ability to analyze signaling procedures, message sequences, information elements,…