PaiDefence

We are a British—Ukrainian air defence tech company building distributed systems across the frontline. We are looking for an 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

• 2+ 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 are a British—Ukrainian air defence tech company building distributed systems across the frontline. We are looking for a Senior AI Platform Engineer to take ownership of the data and ML infrastructure behind our current and future inference products.

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.

What you’ll do

• Build production-grade data collection, labeling, and dataset curation pipelines for inference models, with especial focus on CV models
• Design workflows for annotation, quality control, and continuous dataset improvement
• Set up model deployment, experiment tracking, versioning, and monitoring
• Support & optimize training and inference runtime pipelines in production environments
• Help run experiments, evaluate results, and improve system performance
• Help define the architecture and engineering standards for ML infrastructure across product lines

Requirements:

• Strong MLOps experience building data pipelines, labeling workflows, model deployment & production optimization, experiment tracking, and orchestration
• Background in Machine Learning / Computer Vision and experience with popular ML frameworks
• Ability to be involved in research process: help experiment, evaluate, deploy, improve
• Strong analytical thinking and solid foundations in linear algebra, probability, and statistics
• English: B1 or higher (working w/ international team members)

Nice to Have

• Experience in DefenseTech, SigInt, or embedded systems
• Understanding of RF-related data or sensor-driven ML systems
• Experience with real-time or low-latency ML pipelines
• Background in active learning, human-in-the-loop labeling, or continuous retraining workflows

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
• Remote, hybrid or offline Full-time position with office in the center of Kyiv

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 looking for a Lead Hardware & Systems Engineer to own the full hardware domain — from system architecture through to serial production and stable field operation. You will drive our prototype to a production-ready device, coordinate mechanical and electronics engineers, and set up small-series manufacturing with potential to scale.

Responsibilities

• Architecture & Design — system hardware architecture, component and enclosure selection, thermal management, sealing, rugged design decisions, and technical specifications
• Hands-on Development — hardware bring-up, testing, verification, reliability analysis, and fault investigation
• Industrial Readiness — prototype-to-DFM/DFA transition, production documentation, contractor management, and quality control

• System Integration — integration of hardware with electronics, sensors, and antenna systems; cable architecture; field power; uptime and health monitoring

   

Requirements

• Proven experience in hardware system development
• Track record of taking a product from prototype to serial production
• Strong system architecture skills and hands-on hardware development
• Familiarity with industrial-grade or mil-tech standards
• Understanding of mechanical design and CAD tools

Nice to Have

• Experience with rugged solutions for field or industrial environments
• Background in DefenseTech, aerospace, or adjacent domains
• Familiarity with RF components or antenna systems
• English — B1+ (technical documentation, occasional communication)

What We Offer

• Real impact — your decisions directly affect the reliability of air defence systems in the field
• Full ownership of the hardware domain from day one
• Deep-tech engineering challenges that don’t exist in the civilian sector
• Office in central Kyiv, 3 minutes from the metro
• Full-time, standard business hours; some tasks may require involvement outside the usual schedule (field testing, critical updates)