--- title: 'Middle/Senior Python Developer (Desktop Team) at Ajax Systems' canonical: 'https://feeny.ai/job/middle-senior-python-developer-desktop-team-ajax-systems-kyiv-drpr75v7tw4p' type: 'job' last_seen: '2026-09-07' --- # Middle/Senior Python Developer (Desktop Team) at Ajax Systems - **Company:** Ajax Systems - **Location:** Kyiv, Ukraine - **Employment:** full-time - **Work type:** onsite - **Posted:** 2025-09-25 - **Last confirmed live:** 2026-09-07 - **Apply:** https://jobs.lever.co/ajax/8d3d07e6-f84f-484c-90f7-99e9c393ab74 ## Job description Ajax Systems is a full-cycle company, working from idea generation and R&D to mass production and sales. We do everything: we produce physical devices (the system includes many different sensors and hubs), write firmware for them, develop the server part, and release mobile and desktop applications. PRO Desktop meets the needs of every professional working with Ajax security systems. Facilities profiling and remote configuration, alarm monitoring and photo verification, staff administering, and a detailed event log — all in one, intuitive interface. Responsibilities: - Ajax PRO Desktop development (adding new devices, supporting existing devices, adding new functionality and features, fixing bugs). - Architectural decisions and concept development. - Writing tests. - Hard bug fixing. - Inter-commands communications. Stack: - Python 3, PySide 6, QML, gRPC. Must have: - 3+ years of experience with Python, including multithreading, asyncio. - Knowledge of OOP principles and patterns. - Experience with aiohttp. - Experience with pytest. - Experience with gRPC. It will be a plus: - Experience with QML. - Experience with PySide/PyQt. We offer: - Flexible schedule at our offices in Kyiv or Lviv. - The opportunity to propose and implement own ideas that have an impact on the product and production. - Work in a motivated team and zero bullshit culture. - Competitive salary. - Medical Insurance. - Corporate English. - The opportunity to participate in the beta test project of Ajax security systems - receiving and testing new gadgets before their release. Responsibilities: - Ajax PRO Desktop development (adding new devices, supporting existing devices, adding new functionality and features, fixing bugs). - Architectural decisions and concept development. - Writing tests. - Hard bug fixing. - Inter-commands communications. Stack: - Python 3, PySide 6, QML, gRPC. Must have: - -3+ years of experience with Python, including multithreading, asyncio. - Knowledge of OOP principles and patterns. - Experience with aiohttp. - Experience with pytest. - Experience with gRPC. It will be a plus: - Experience with QML. - Experience with PySide/PyQt. ## About Ajax Systems ## Company Overview - **One-liner**: Ajax Systems designs and manufactures wireless security, fire safety, video surveillance, and smart home automation systems, sold in over 180 countries. - **Entity Type**: Private (Series A, $10M from Horizon Capital in 2019) - **Headquarters**: Kyiv, Ukraine - **Founded**: 2014 (first investment in 2015) - **Founders**: Aleksandr Konotopskyi ## Core Business - **Primary industries**: Security systems, smart home, IoT, fire and life safety, video surveillance - **Target customers**: B2B (security installers, monitoring stations, distributors) and B2C (homeowners and businesses) - **Mission**: “Stand against evil using innovative yet intuitive technologies.” ## Products & Services - **Ajax Security System**: Wireless intrusion detection system including hubs, motion detectors, door/window sensors, glass break detectors, sirens, panic buttons, and keypads – all managed via iOS/Android/macOS/Windows apps. - **Fire & Life Safety**: Smoke detectors with HazeFlow algorithm, leak detectors, air quality monitors – active 24/7 regardless of security mode. - **Video Surveillance**: Cameras and NVRs introduced in 2023, integrated into the same system. - **Comfort & Automation**: Smart plugs, relays, switches, and scenarios for lighting, heating, and appliance control. - **OS Malevich**: Proprietary real-time operating system for hubs, supporting OTA updates, cloud connectivity, and up to 150 devices. - **Jeweller Radio Technology**: Two-way encrypted communication at 868 MHz with up to 2 km range and alarm delivery in <0.15 seconds. ## Market Standing - **Valuation/Market Cap**: Not publicly disclosed - **Key Metric**: Total funding $11M ($1M seed from SMRK in 2015, $10M Series A from Horizon Capital in 2019) - **Notable Investors/Partners**: SMRK (Oleksandr Kosovan, Andriy Dovzhenko), Horizon Capital (Emerging Europe Growth Fund III) - **Growth Signals**: 4,100+ employees (as of 2026), 4 million users, presence in 187 countries, second factory opened in Turkey (2022), product line expanded to video surveillance (2023) ## Competitive Advantages - **Full-cycle production** in Ukraine and Turkey – all devices designed and manufactured in-house, ensuring quality control and rapid iteration. - **Proprietary technologies**: Jeweller radio protocol, OS Malevich, HazeFlow smoke verification – create a unique, integrated ecosystem. - **European certifications**: Grade 2 (wireless) and Grade 3 (wired) per EN 50131, fire standard EN 14604 – trusted by professional security companies. - **Award-winning**: Recognized at IFSEC, Intersec, and by PSI Magazine, GIT Security – one of Europe’s most awarded security systems. ## Strategic Focus - **Global expansion**: Strengthening presence in Western Europe (top markets: Ukraine, Spain, Italy, France, UK) and diversifying production geographically. - **Product innovation**: Adding video surveillance and expanding automation/comfort devices to create a unified smart security platform. - **R&D investment**: Continuous development of new wireless protocols, algorithms, and hardware across R&D centers in Kyiv, Kharkiv, Vinnytsia, and Lviv. ## Why Work Here - **Culture**: A multinational team of over 4,100 people with a strong sense of purpose – “stand against evil” – and a history of resilience forged through Ukraine’s challenges. - **Work model**: On-site roles in Kyiv and Istanbul; representative offices in UAE, UK, Italy, Spain, and other regions. - **Engineering focus**: Full-cycle product development from scratch, R&D-driven environment, modern tech stack (RTOS, cloud, OTA updates). - **Perks**: ISO 14001 environmental management, commitment to RoHS compliance, and a flat, impact-oriented structure. Hiring process uses AI tools to support application review. ## Sources 1. [Ajax Systems Career Page](https://ajax.systems/career/global/) 2. [Ajax Systems About Page](https://ajax.systems/about/) 3. [Ajax Systems FAQ](https://ajax.systems/faq/) 4. [Ajax Systems Jobs on Lever](https://jobs.lever.co/ajax/) ## Other roles at Ajax Systems - [Embedded Linux Engineer (Video Devices)](https://feeny.ai/job/embedded-linux-engineer-video-devices-ajax-systems-kyiv-vtgb7g2jgw66) — Kyiv, Ukraine - [Java Developer (Infrastructure)](https://feeny.ai/job/java-developer-infrastructure-ajax-systems-kyiv-zpnc58be2cew) — Kyiv, Ukraine - [QA Lead (Prod Tools)](https://feeny.ai/job/qa-lead-prod-tools-ajax-systems-kyiv-2k9dpvpb28yw) — Kyiv, Ukraine - [Electronics assembler (Dev in Test Device Team)](https://feeny.ai/job/electronics-assembler-dev-in-test-device-team-ajax-systems-kyiv-q1y94ghkne4t) — Kyiv, Ukraine - [Pracownik magazynu (Warehouse Worker)](https://feeny.ai/job/pracownik-magazynu-warehouse-worker-ajax-systems-lodz-518xafs5p7ra) — Lodz, Poland - [Business Development Manager (Wales)](https://feeny.ai/job/business-development-manager-wales-ajax-systems-cardiff-fv3nqhngftqs) — Cardiff, United Kingdom - [National Accounts Manager - Remote, USA](https://feeny.ai/job/national-accounts-manager-remote-usa-ajax-systems-remote-m0sapkxv3cch) - [Junior/Strong Junior Python Developer](https://feeny.ai/job/junior-strong-junior-python-developer-ajax-systems-kyiv-5tksjptmq7fe) — Kyiv, Ukraine - [Sales Operations Manager (relocation to UAE)](https://feeny.ai/job/sales-operations-manager-relocation-to-uae-ajax-systems-kyiv-vxn181zhyz8z) — Kyiv, Ukraine - [Sales Operations Manager](https://feeny.ai/job/sales-operations-manager-ajax-systems-turin-f0q4m0r2pyb4) — Turin, Italy