Guided by autonomy — driven by purpose

Guided by autonomy
driven by purpose

User-customizable autonomy for any form-factor. Enables UAVs to autonomusly execute mission chain: navigate, detect, eliminate.

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/ Features

Use missions, not features

You own the tactics. Your mission next.

Autonomous Navigation

Automated relay drone for high-throughput operations

Terminal Guidance

Engage selected target with operator on high-latency communications

ISR

Autonomous reconssaince with radio silence in GNSS-denied env

Payload release

Controlled release of payload from aerial platform onto ground target
/ demo video

VGM-208 in Action

See how VGM-208 enables UAVs to navigate, detect, and strike with autonomy even inGPS-denied and EW-heavy environments.
/ Presentation Products

our products

VGM-208
Tarzan-10

Autonomy Designed for GNSS-Denied Operations

An all-in-one autonomy module integrating navigation, detection, tracking, and terminal guidance:
  • NDAA-compliant components, battle-proven in Ukraine
  • Developed and manufactured with components from the US, EU, and Ukraine
  • User-configurable autonomy profiles deployable in one week, built on 50+ integrations with established workflows and full documentation.

Specifications

[ show ]
Autonomy Designed for GNSS-Denied Operations
[ show ]
request a demo

Mission-Ready in GNSS-Denied Environments

Designed to operate reliably where satellite navigation is unavailable or compromised.:
  • Built for full autonomy in contested electromagnetic environments
  • Ukraine-designed, NATO-compatible, China-free from top to bottom
  • Designed for swarm operations, allowing one operator to control multiple drones with minimal input
  • The system is designed with autonomy as a core capability

Specifications

[ show ]
Mission-Ready in GNSS-Denied Environments
[ show ]
request a demo
/ Who We Build For

Designed for teams that need deployable autonomy

OEMs

Integrate turnkey autonomy modules directly into your platforms.

Defense integrators

Accelerate programs — skip exploratory R&D, deploy field-proven capability.

Resellers & distributors

Offer rugged autonomy technology to demanding operational customers.

Government & MoD programs

Modules ready for real missions, not slideware demos.

Frontline users in Ukraine

Technology shaped by real operational feedback — validated where it matters.

OEMs

Integrate turnkey autonomy modules directly into your platforms.

Defense integrators

Accelerate programs — skip exploratory R&D, deploy field-proven capability.

Resellers & distributors

Offer rugged autonomy technology to demanding operational customers.

Government & MoD programs

Modules ready for real missions, not slideware demos.

Frontline users in Ukraine

Technology shaped by real operational feedback — validated where it matters.
/ Our team

The people behind the autonomy

Every reliable system begins with a team that holds the line on integrity, precision, and accountability. With 25 engineers across Ukraine and Europe, FoxFour advances autonomy through discipline, partnership, and technology that performs — and protects.

Yurii Stasinchuk

/ co-founder & ceo
DARPA competition winner;
publications on ICRA, Robotics
and Autonomous Systems

Roman Milishchuk

/ Co-founder & CTO
Deployed AI algorithms to thousands
of embedded devices for Amazon/Ring

Iuliia Biletska

/ COO
Former Head of Finance at Ukrainian Helicopters, managing civil and UN helicopter fleets

Yurii Stasinchuk

/ ceo
DARPA competition winner;
publications on ICRA, Robotics
and Autonomous Systems

Roman Milishchuk

/ Co-founder & CTO
Deployed AI algorithms to thousands
of embedded devices for Amazon/Ring

Iuliia Biletska

/ COO
Former Head of Finance at Ukrainian Helicopters, managing civil and UN helicopter fleets
/ Careers

Work on What Matters

If you’re interested in exploring career opportunities or joining our team, please contact us — info@foxfour.ai
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
/
EUROPE

Project Manager 🇨🇿 Prague

  • Coordinate Integration and R&D teams to maintain product development roadmap
  • Plan & coordinate testing trips to end-users in Ukraine
  • Communication with third-party drone developers
Apply
/
Europe

State Estimation Engineer 🇨🇿 Prague

  • Develop custom Factor graphs for Sensor Fusion (Visual, Thermal, Map-matching) for GNSS-denied operations
  • Deploy on Arm A73 core (TI AM68 platform)
  • Integration with ArduPilot for copters & fixed-wings
Apply
/
Europe

Mechanical Engineer 🇨🇿 Prague

  • Design complex 3D mechanical parts and assemblies for UAV platforms
  • Develop lightweight structures with a strong focus on vibration behavior and damping
  • Collaborate closely with control, electronics, and perception teams
Apply
/
Europe

Embedded QA Automation Engineer 🇨🇿 Prague

  • Validate Quality Control of the hardware modules via automated HITL testing
  • Analyse firmware/hardware regressions
  • Knowledge of Bash, Python, Linux, CI
Apply
/
Europe

Manufacturing Lead 🇨🇿 Prague

  • Manage & hire the manufacturing personnel
  • Align supply chain procurement with back office
  • Ensure that system delivery is on scheduled timeline
Apply
/
Ukraine

Robotics Engineer 🇺🇦 Lviv

  • Develop in simulation environment (Gazebo, IsaacSim/Pegasus)
  • Trajectory planning for custom operations
  • Integrate algorithms onto real UAV platforms
Apply
/
Ukraine

Integration Lead 🇺🇦 Lviv

  • Lead a team of 3-5 people for VGM integration into the drone
  • Communicate with clients on testing days and locations
  • Strong technical competence
Apply

DON’T SEE THE RIGHT ROLE?

If you’re interested in exploring career opportunities or joining our team, please contact us.
INFO@FOXFOUR.AI
/ Events

Where to meet us

FoxFour participates in leading defense and autonomy events across Europe and beyond. Join us to talk about careers, partnerships, and technology — from building with us to deploying with us.

Supply Security and Defence Expo

DroneTech & Autonomy Expo

Defense Tech Innovations Forum 2025

International Defence Industries Forum

Visit event website

Supply Security and Defence Expo

Visit event website

DroneTech & Autonomy Expo

Visit event website

Defense Tech Innovations Forum 2025

Visit event website

International Defence Industries Forum

Visit event website
/ Contacts

join the mission

/ LOCATIONS
Tallinn, Estonia
Prague, Czechia
Lviv, Ukraine
/ email
info@foxfour.ai
/ socials

foxfour

Guided by autonomy —
driven by purpose
/ Stacks
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Demos
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/ company
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[ close ]

Autonomy Designed for GNSS-Denied Operations

An all-in-one autonomy module integrating navigation, detection, tracking, and terminal guidance:
  • NDAA-compliant components, battle-proven in Ukraine
  • Developed and manufactured with components from the US, EU, and Ukraine
  • User-configurable autonomy profiles deployable in one week, built on 50+ integrations with established workflows and full documentation.

Specifications

Physical specs:
  • Size & Weight:
    85 × 53 × 22 mm, 250 g
Visual-inertial navigation:
  • Position error:
    <2.5%
  • Altitude range:
    0-250 m
  • Max speed:
    35 m/s, 130 km/h
  • Operational conditions:
    daylight, snow,
    moderate fog
  • Terrain restrictions:
    ineffective over water
Tracker:
  • Pursuit capabilities:
    track+follow supported
Detector:
  • Vehicle detection range*:
    250 m
    *1080p+ camera,
    target size ≥ sedan
  • Large targets (>30m) det range:
    450 m
Terminal guidance:
  • Angle of attack:
    50-70 km/h
  • Max speed:
    60 km/h
  • Attack of moving targets:
    up to 3kg
[ close ]

Mission-Ready in GNSS-Denied Environments

Designed to operate reliably where satellite navigation is unavailable or compromised.:
  • Built for full autonomy in contested electromagnetic environments
  • Ukraine-designed, NATO-compatible, China-free from top to bottom
  • Designed for swarm operations, allowing one operator to control multiple drones with minimal input
  • The system is designed with autonomy as a core capability

Specifications

Physical specs:
  • Frame size & Weight:
    10”,  1.1 kg
  • Dimensions:
    374 × 309 × 50 mm
speed:
  • Cruise speed:
    50-70 km/h
  • Terminal speed:
    60 km/h
  • Payload:
    up to 3kg
  • Stable temperature range:
    -10 ℃ ~ 50℃
Hw & Electronics:
  • Flight Controller:
    H743
  • Motors:
    900 kv
  • Propellers:
    1050-3
  • Receiver:
    SineLink, ELRS 915MHz
Flight Performance:
  • Recommended battery:
    6S3P LiOn 12000 mAh
  • Flight time:
    30 minutes
  • 2kg payload:
    21 minutes, subject to weather
  • 3kg payload:
    13 minutes, subject to weather
[ close ]