---
title: 'Senior Java Developer at Ajax Systems'
canonical: 'https://feeny.ai/job/senior-java-developer-ajax-systems-kyiv-daaz7d1k5hj4'
type: 'job'
last_seen: '2026-09-07'
---

# Senior Java Developer at Ajax Systems

- **Company:** Ajax Systems
- **Location:** Kyiv, Ukraine
- **Work type:** onsite
- **Posted:** 2026-08-25
- **Last confirmed live:** 2026-09-07
- **Apply:** https://jobs.lever.co/ajax/1dd5ff20-720d-4ad0-9d42-e946f1967730

## Job description

Ajax Systems, an international tech company and the largest manufacturer of security systems in Europe.

We’re looking for Java Developer to join us and continue the evolution of a product that we love. The team focuses on the B2B segment at Ajax Systems. It develops software solutions for business partners, supports applications for monitoring and installation companies, and develops a tablet application for rapid response teams.

Required skills:

- 8+ years of commercial experience in backend development with Java in an enterprise environment.
- Strong understanding of Java Concurrency and hands-on experience with concurrent programming in production systems.
- Solid understanding of SOA, microservices and event-driven architecture.
- Practical experience with cloud computing platforms.
- Experience building and supporting high-load, scalable and highly available systems;
- Hands-on experience with messaging brokers.
- Strong understanding of modern backend infrastructure, NoSQL, key-value databases and in-memory storage solutions.
- Practical experience with Kubernetes.
- Experience with Git, Gradle or othet CI/CD tools.
- Strong knowledge of unit testing and automated testing approaches.

Would be a plus:

- experience with these technologies: Redis, Netty, Akka, NATS, AWS, Kafka, MongoDB, gRPC.
- Practical experience with Kotlin.
- Desire to grow into a team leadership role.

What you will do:

- design and develop core backend services and data pipelines for the product line.
- Build clean, maintainable, and production-ready code with a strong focus on quality.
- Contribute to backend architecture, drive technical decisions and document solutions for reliable deployment and operations.
- Ensure proper test coverage with unit and integration tests.
- Take ownership of performance, scalability and cost efficiency within your domain.
- Maintain production reliability through monitoring, alerting, dashboards, and runbooks.
- Investigate and resolve production issues, including deep-dive analysis of complex cases.
- Work in a strong engineering culture with testing, continuous delivery and DevOps practices.
- Collaborate closely with product and engineering teams to deliver new features and improve existing services.

Why this role is interesting:

- opportunity to work on high-load backend systems and distributed architecture.
- Real impact on core product development and architectural decisions.
- Modern technology stack and engineering-driven environment.
- Challenging tasks where performance, reliability and scalability truly matter.

We offer:

- the opportunity to suggest and implement your own ideas that directly influence the product and its mass production.
- A place in a fast-growing company with a motivated and professional team.
- Medical insurance.
- Corporate English classes.
- The opportunity to participate in Ajax’s internal beta-testing program for security systems.
- Discounts from partner companies and on Ajax products.

## 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