RF System Integration Engineer

AST SpaceMobile and our global partners are building the first and only space-based cellular broadband network to be accessible by standard smartphones. Called SpaceMobile, this ultra-powerful network is being designed to provide connectivity at 4G/5G speeds everywhere on the planet – on land, at sea and in flight.

Position Overview

We are seeking a highly hands-on RF Assembly, Integration, and Test (AIT) Engineer to execute, integrate, test, and debug flight RF hardware supporting a fast-paced LEO satellite program at AST SpaceMobile.

This is a hardware-centric execution role. The selected candidate will personally build, integrate, verify, troubleshoot, and support RF systems from bench validation through launch operations. You will partner directly with TT&C and GPS design leads who own system architecture and requirements, translating released designs into robust, flight-ready hardware.

This is not a documentation or coordination position — it is a build, test, and fix role.

Key Responsibilities

RF Assembly, Integration & Test Execution

Execute integration and verification testing for TT&C and GPS flight hardware.

Own hands-on integration and test of:

Flight radios and transceivers

Flight antennas

RF harnessing and coaxial assemblies

AIT RF racks and ground support equipment (GSE)

Work directly from released schematics, ICDs, and mechanical interfaces.

Verify RF performance margins, interface integrity, and system compliance through empirical hardware testing and data analysis.

Hands-On Manufacturing & Build Support

Personally drive RF hardware build, inspection, integration, and rework activities.

Fabricate, inspect, and validate:

Coaxial cable assemblies

Connector terminations (SMA, TNC, N-type, etc.)

Harness routing, clamping, torque application, and strain relief implementation

Maintain active presence on the manufacturing floor during hardware builds.

Partner with manufacturing engineers and technicians to ensure workmanship standards.

Identify and arrest integration escapes, workmanship defects, and latent hardware risks before propagation.

AIT, Test, Debug & Automation

Design, assemble, and sustain AIT RF racks and associated test infrastructure.

Execute and continuously improve:

RF functional testing

End-to-end TT&C and navigation test configurations

Return loss, insertion loss, isolation, power output, and sensitivity measurements

Develop and maintain RF test automation:

Automate repetitive RF test sequences and structured data capture

Improve repeatability, throughput, and configuration traceability

Support environmental and system-level testing including:

Thermal vacuum (TVAC)

Vibration

Thermal cycling

Spacecraft integrated testing

Own RF anomaly resolution:

Debug harness, connector, and integration defects

Identify workmanship-induced damage

Isolate EMI/RFI coupling issues under schedule pressure

When hardware fails during test, personally execute root cause isolation and corrective rework.

Acceptance, Readiness & Launch Support

Execute formal acceptance testing per released procedures and qualification requirements.

Review test data packages, close discrepancy reports, and verify flight readiness.

Support launch site operations, including last-minute RF troubleshooting and configuration validation.

What Winning Looks Like

RF hardware integrates cleanly and predictably in AIT.

Issues are identified early, debugged efficiently, and closed with permanent corrective action.

RF systems perform consistently from bench validation → environmental test → launch → orbit.

You can point to the spacecraft and confidently state: “I built and tested that system.”

Qualifications

Education

BS or MS in Electrical Engineering, or equivalent demonstrated hands-on RF experience.

Experience

Strong practical RF experience across common TT&C frequency bands.

Demonstrated hands-on experience with:

RF assemblies and coax harness fabrication

Antennas and RF subsystems

RF test equipment (VNA, spectrum analyzer, power meters, signal generators)

Experience supporting AIT, environmental test campaigns, and production manufacturing.

Comfortable operating in cleanroom, laboratory, and factory environments.

Proven ability to troubleshoot and close hardware issues under aggressive timelines.

Preferred Qualifications

Direct LEO satellite RF or TT&C integration experience.

Launch base or on-orbit support exposure.

Experience supporting multiple flight vehicles in parallel.

Background developing automated RF test frameworks and data systems.

Soft Skills

High ownership mentality with strong bias toward execution.

Detail-oriented while maintaining schedule awareness.

Pragmatic decision-making in ambiguous or data-limited environments.

Collaborative across design, manufacturing, and test organizations.

Calm and methodical under hardware anomaly pressure.

Technology Stack

Vector Network Analyzers (VNA)

Spectrum Analyzers

RF Signal Generators

Power Meters

RF Switching Matrices

Automated Test Software (Python, LabVIEW, or equivalent)

Standard AIT data logging and configuration management tools

Physical Requirements

Ability to work extended periods in cleanroom and lab environments.

Frequent hands-on bench work requiring fine motor skills.

Ability to lift and maneuver test equipment and RF racks (up to 40 lbs).

Willingness to travel to launch sites as required.

AST SpaceMobile is an Equal Opportunity, at will Employer; employment is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.