Radar Engineer

Location: Onsite - Austin, TX

Employment Type: Direct Hire, Full-Time

Job Title: Radar Engineer

About 9 Mothers

The modern battlefield has changed. Cheap, autonomous suicide drones have turned the

tactical advantage upside down, and the world is looking for a solution. At 9 Mothers, we

aren’t just "innovating"-we are building the shield.

Backed by top-tier investors, we develop AI powered machines designed to intercept and

neutralize Group 1/sUAS threats in real-time. Our flagship product is a low-power,

counter-drone system built for the edge-on vehicles, at bases, or in a soldier's pack.

Why 9 Mothers?

While others build for "awareness" or "long-term research," we build for the immediate

survival of those in harm’s way. We are a team of hackers, engineers, and mission-driven

builders who value field-ready capability over polished slide decks. If you want to see

your code or hardware in the field next month-not next year-this is your playground.

Position Summary

9 Mothers is hiring a Radar Engineer to own the radar sensing layer of our counter-sUAS

kill chain. In this role, you will integrate and tune radars from multiple vendors so that their

detections and tracks feed cleanly into our platform-alongside our passive acoustic

(Vor) and in-house visual detection stack-giving Edda and future systems an earlier,

more reliable picture of incoming threats.

You will own the full radar lifecycle: characterizing sensors, writing the software that

ingests and processes radar data, tuning radar configurations for performance against

small, fast, low-RCS targets in cluttered environments, and validating that performance

on the range. This role sits at the intersection of RF engineering, embedded and real-time

software, and systems integration in a fast-moving defense startup environment.

Radar Engineer - Job Description (Draft)

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Essential Duties

Radar Characterization: Run bench and range characterization of the radars we field

(e.g., FMCW, pulse-Doppler, electronically scanned arrays) to verify vendor

performance claims and establish baselines for tuning.

Radar Integration: Integrate multiple radar models into our counter-drone platform,

including mechanical/electrical interfaces, timing and synchronization, coordinate-

frame alignment, and vendor SDKs, APIs, and data protocols.

Software Development: Design, build, and maintain the software that configures

radars and ingests, filters, and publishes their detections and tracks to the rest of our

system in a reliable, low-latency manner.

Performance Tuning: Tune radar parameters-waveform and mode selection,

detection thresholds, CFAR, clutter maps, Doppler filtering, and track

initiation/maintenance-to maximize probability of detection and minimize false

alarms against small, fast sUAS in real-world environments.

Sensor Fusion Support: Work with the perception and controls teams to fuse radar

tracks with acoustic and EO/IR data, and to cue our visual tracking and effectors from

radar.

Testing & Validation: Build and execute test plans, including simulation, hardware-in-

the-loop, and live-flight range testing with our UAS pilots, and establish metrics for

detection range, track quality, latency, and false-alarm rate.

Field & Customer Support: Support radar setup, site surveys, and tuning during

customer demonstrations, pilots, and field deployments, troubleshooting issues from

the RF front end through the software stack.

Documentation: Produce and maintain integration documentation, interface control

documents (ICDs), tuning guides, and test reports for internal teams and external

partners.

Requirements

Radar Experience: 5+ years of hands-on experience as a radar engineer, radar systems

engineer, or similar role, including work with more than one radar type or vendor.

Integration Track Record: Demonstrated experience integrating radars into larger

systems (vehicles, fixed sites, C-UAS, air defense, autonomy, or similar) and taking that

integration through to fielded use.

Radar Engineer - Job Description (Draft)

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Tuning & Optimization: Proven experience tuning radar configuration and processing

parameters to improve detection, tracking, and false-alarm performance in real-world

clutter and interference.

Radar Fundamentals: Strong working knowledge of radar principles, including the

radar range equation, RCS, Doppler processing, CFAR, clutter, multipath, and multi-

target tracking (e.g., Kalman filtering, data association).

Programming & Tooling: Proficient in C++ and Python, with the ability to write

production-quality code for radar data ingestion and processing on Linux.

Systems Troubleshooting: Comfortable diagnosing issues across RF hardware,

networking (TCP/UDP), timing, and software layers, and using lab equipment such as

spectrum analyzers and oscilloscopes.

Independence & Ownership: Resourceful self-starter comfortable owning ambiguous

sensor problems end-to-end and spending meaningful time on the range in a fast-

moving startup environment.

Compliance: This position requires access to export-controlled information under

ITAR. Only U.S. citizens are permitted. Must be willing to submit a background check.

Nice-to-Have

C-UAS Radar Experience: Hands-on experience with radars purpose-built for counter-

drone or short-range air surveillance (e.g., Echodyne, Robin Radar, Blighter, RADA, or

comparable systems).

Small-Target Detection: Experience detecting and classifying Group 1 sUAS, including

micro-Doppler signatures and discrimination of drones from birds and ground clutter.

Signal Analysis Tools: Experience with MATLAB or NumPy/SciPy for radar signal and

data analysis.

Sensor Fusion: Multi-modal fusion experience combining radar with EO/IR, acoustic, or

RF sensors.

Embedded & Real-Time Systems: Experience with ROS/ROS 2, NVIDIA Jetson or other

edge compute, FPGAs, or real-time signal processing pipelines.

Interoperability Standards: Familiarity with formats such as ASTERIX, Cursor-on-

Target, or SAPIENT for sharing radar tracks with C2 systems.

Defense Industry Background: Experience in an ITAR or compliance-bound defense

environment, or prior work at a defense contractor or with DoD customers.

Radar Engineer - Job Description (Draft)

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Education: BS/MS in Electrical Engineering, Physics, or a related field with a focus on

RF, signal processing, or radar.

Clearance: Active security clearance or eligibility to obtain one.

A passion for building robots or engineering projects as a hobby.

Benefits

Meaningful Early Equity: You aren’t just an employee; you are a foundational owner.

Your contributions directly drive the value of your stake in the company.

Direct Roadmap Influence: Forget the bureaucracy of big defense. You will have a seat

at the table, directly shaping our product and technology trajectory from day one.

Mission-Critical Work: We don’t build for "what if." We build systems the Department

of War actively needs to counter immediate, real-world threats.

The Builder’s Playground: Work in a brand-new lab fully optimized for rapid

prototyping, equipped with NVIDIA Jetsons, high-end scopes, and 3-D printers.

100% Employer-Paid Premiums: We cover 100% of your medical, dental, and vision

insurance premiums and cover 50% of healthcare premiums for your dependents.

Unlimited PTO: We value results, not clock-watching. Take the time you need to stay

sharp and recharge.

Zero Red Tape: You have the autonomy to make technical decisions that would take

months of committee approval at a larger firm.

Austin-Based Culture: Join an onsite team in Austin, TX, where we prioritize high-

bandwidth collaboration and rapid field-testing.

Relocation Assistance: We want the best talent in the room. If you aren’t in Austin yet,

we’ll help you get here, to make your transition to the Silicon Hills seamless.

Aboutthe Interview

1. Phone call with recruiter (30 min)

2. First Round Virtual Interview (2 hour 15 min total) via MS Teams

Part 1 (1 hour) - An evaluation of your core radar and software skills to confirm

alignment with the required technical knowledge for this role.

Interview Break (15 min) - A quick pause to step away and grab a glass of water.

Part 2 (1 hour) - A deep dive into radars you have integrated and tuned, to explore

your specific domain expertise.

Radar Engineer - Job Description (Draft)

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3. 2nd/Final Round Interview (6 hours) onsite in Austin, TX

Hands-on Working Session (3 hours) - You’ll work through a small radar data or

integration problem alongside our team. We’ll look at how you approach problem-

solving, leverage resources, and collaborate with team members to reach a solution.

Architecture Discussion (1-2 hours) - A discussion focused on big-picture thinking

-how radar fits into the sensing and engagement chain, system design

considerations, and architectural recommendations.

Wrap-up Conversations (30 min-1 hr) - Two 1:1 individual conversations to discuss

team fit and address any questions you have for us.

4. Reference Checks & Offer

EqualEmployment Opportunity

9 Mothers is an Equal Opportunity Employer. All qualified applicants will receive

consideration for employment without regard to race, color, religion, sex, sexual

orientation, gender identity, national origin, disability, or protected veteran status.

Export Control

This position may require access to information or technology subject to U.S. export

control laws and regulations, including the International Traffic in Arms Regulations

(ITAR). U.S. citizenship is required.