Cellular Protocol Engineer - 3G/LTE/5G Analysis & Testing

Precise Systems, Inc.; Crane (IN); On-site; USD 90,000 - 130,000; Full time

Benefits offered by this job

E-Verify

Benefits summary

Equal opportunity employer

Job summary

Precise Systems, Inc. seeks a Cellular Protocol & Software Engineer to support NSWC Crane's Expeditionary Electromagnetic Warfare mission.

You'll analyze 3G/LTE/5G protocol stacks, decode signaling, and develop software in C, C++, and Python to emulate and test cellular behavior in lab, OTA, and field environments. Candidates should have a Bachelor's in a relevant engineering field, at least 3 years of experience, and strong written communication.

Qualifications

• Bachelor's degree in a relevant engineering field.
• At least 3 years of professional experience in computer design, software development, or computer networks.
• Hands-on experience analyzing cellular protocols at protocol-stack, signaling-message, or packet level.
• Working knowledge of 3GPP LTE/5G protocol behavior, including RRC, NAS, PDCP, RLC, MAC, and PHY.
• Strong programming in C, C++, and Python for protocol analysis and test development.

Responsibilities

• 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 3GPP procedures such as registration/attach, authentication, security establishment, session setup, mobility, handover, and connection management.
• Identify protocol fields, information elements, 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, analyze, 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.

Skills

C

C++

Python

Protocol analysis

Technical writing

Education

Bachelor's degree in Computer Engineering, Electrical Engineering, Electronics Engineering, or Mathematics (CS)

Tools

Wireshark

OpenAirInterface

srsRAN

Job description

Precise Systems, Inc. seeks a Cellular Protocol & Software Engineer to support NSWC Crane's Expeditionary Electromagnetic Warfare mission.

You'll analyze 3G/LTE/5G protocol stacks, decode signaling, and develop software in C, C++, and Python to emulate and test cellular behavior in lab, OTA, and field environments. Candidates should have a Bachelor's in a relevant engineering field, at least 3 years of experience, and strong written communication.