Paidefence

Paidefence is a British-Ukrainian air defence tech company building distributed systems across the frontline. Our core value is impact for Ukraine: we build technology that makes a real difference on the actual battlefield, not in labs or on paper specs. We operate with a deep-tech mindset, pushing new technologies where engineering rigor truly matters.

We’re looking for an experienced Linux engineer whose primary responsibility will be integrating various SDR (Software Defined Radio) devices into our software platform. This is a role for those who love working at the hardware-software boundary, understand how data travels from physical ports to high-level applications, and can make that path as fast and reliable as possible.

What you’ll do:

• Integrate different SDR models into a unified Linux-based ecosystem
• Work with vendor SDKs and develop high-performance userspace applications
• Optimize high-throughput data processing in real-time
• Write clean, stable, and performant code in C++ or Python
• Debug inter-process communication, manage buffering and latency

Requirements:

• 5+ years of professional Linux systems experience
• Linux Power User: comfortable in terminal, understands kernel-space vs user-space, knows systemd and driver configuration
• Hardware Interface Expert: hands-on experience with USB 2.0/3.0, Ethernet, or other high-throughput interfaces
• Data Stream Architect: understands IPC principles, ring buffers, memory overflow prevention, and latency minimization for raw data transmission
• C++ Developer: writes reliable code that doesn’t crash on the first unexpected packet from hardware
• English: B2 or higher

Nice to have:

• SDR experience: familiar with RTL-SDR, HackRF, USRP, or has GNU Radio experience
• Experience with ROS/ROS2 (node development, topics/services)
• Understanding of data transmission protocols and digital signal processing (DSP)
• Hobbies related to electronics, radio communication, or robotics

We offer:

• Meaningful, high-impact work in Ukraine’s air defense domain
• Deep-tech engineering challenges where rigor and performance matter
• High ownership and autonomy from day one
• Work format: Kyiv office with occasional remote days
• Senior engineering team with direct communication and minimal bureaucracy
• Full-time position with standard hours; occasional off-hours for testing/updates

We are a British—Ukrainian air defence tech company building distributed systems across the frontline. We are looking for a Founding Engineer with deep expertise in Machine Learning and Computer Vision to take full ownership of the architecture and implementation of detection systems for our current and future product lines.

Our core value is impact for Ukraine: we build technology that makes a real difference on the actual battlefield, not in labs or on paper specs. We operate with a deep-tech mindset, pushing new technologies where engineering rigor truly matters. We value ownership and responsibility—people who execute, deliver, and stand behind the results.

We especially value engineers with strong analytical thinking and proven problem-solving skills — such as participation in mathematical/programming olympiads or experience contributing to open-source projects.

Key Responsibilities

• Detection Systems Development: Build and maintain the full lifecycle of ML solutions across the company’s product lines.
• Inference Engineering: Optimize models for real-time operations.
• Backlog Execution & Implementation:
  • Develop RF Classification models (Radio Frequency signals).
  • Improve the accuracy of DoA (Direction of Arrival) algorithms.
  • Implement drone behavior analysis and pilot localization algorithms.
• Best Practices: Define the architecture, tooling, and approaches to build a scalable ML infrastructure from the ground up.

Skills & Requirements

• Strong theoretical background in Linear Algebra, Probability, and Statistics.
• Experience with Computer Vision models: Classification, Object Recognition, and Tracking.
• Python + relevant ML libraries, PyTorch.
• Experience taking models to production (Production ML).
• Hands-on experience with inference engines.
• Ability to build low-latency, real-time detection pipelines.
• Proficiency in C++ and/or CUDA for building high-performance modules.

Nice to Have

• Experience in DefenseTech, SigInt (Signals Intelligence), or Embedded Systems.
• Understanding of Radio Frequency (RF) physics.

We Offer

• Meaningful and high-impact work in the AIR defense domain
• Practical R&D environment with real autonomy
• Direct influence on technical decisions and the product direction
• Work in an experienced senior engineering team
• Сlear, fast, senior-to-senior communication with a minimum number of team meetings
• Office in the center of Kyiv (available for onsite work when required)
• Full-time position
• Standard business hours; some tasks may require involvement outside the usual schedule (testing, critical updates)

We are a British—Ukrainian air defence tech company building distributed systems across the frontline. We are looking for a Strong Middle Embedded Software Engineer who will take full ownership of firmware and embedded systems running on edge devices in harsh, real-world environments.

Our core value is impact for Ukraine: we build technology that makes a real difference on the actual battlefield, not in labs or on paper specs. We operate with a deep-tech mindset, pushing new technologies where engineering rigor truly matters. We value ownership and responsibility—people who execute, deliver, and stand behind the results.

Key Responsibilities

• Firmware Development: Develop firmware for STM32 (ARM Cortex-M) and ESP32 microcontroller series.
• Embedded Linux: Configuration and development for Raspberry Pi.
• Peripheral Integration: Work with I2C, SPI, UART, CAN and other protocols.
• Host-Side Development: Write supporting software, automation scripts, and monitoring systems in Python.
• System Design: Design architecture for industrial solutions with high fault tolerance; build reliable systems where operational stability is the priority.

Requirements

Must Have

• 3+ years of experience in embedded systems development
• Deep knowledge of C/C++ for microcontrollers
• Experience with FreeRTOS (architecture, semaphores, queues)
• Ability to read electrical schematics and use measurement equipment (oscilloscope, logic analyzer)
• Understanding of stable industrial system development principles (watchdogs, error handling, operation in interference conditions)
• English level: Intermediate or higher

Strong Plus

• Experience in PCB design (Altium Designer, KiCad, or EasyEDA)
• Experience with ROS and ROS2
• Rapid prototyping skills: working with 3D printers (FDM/SLA) for creating enclosures or mounts
• Experience with network protocols (MQTT, HTTP, WebSocket) on ESP32/Linux

We Offer

• Meaningful and high-impact work in the air defense domain. Your work directly contributes to Ukraine’s air defense
• Deep-tech challenges: solve engineering problems that don’t exist in the civilian sector
• High ownership: influence technical decisions and the product roadmap from day on
• Work in an experienced senior engineering team
• Clear, fast, senior-to-senior communication with a minimum number of team meetings
• Office-based role in Kyiv (city center), with occasional work-from-home when needed
• Full-time position
• Standard business hours; some tasks may require involvement outside the usual schedule (testing, critical updates)