Senior Java Developer

About the Position

Senior Java Developer

Kyiv / Lviv

On-site

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

We’re looking for a Senior 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.

Responsibilities

• 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.

Requirements

• 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 other CI/CD tools.
• Strong knowledge of unit testing and automated testing approaches.

Nice to Have

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

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 the Company

Ajax Systems is a Ukrainian success story that has grown into a global product. Ajax devices are trusted by more than 4.5 million end users and 330,000 PRO users in over 180 countries. The company provides comprehensive solutions to protect residential and commercial properties of all sizes. Today, Ajax portfolio includes 280 devices for intrusion protection, video surveillance, fire safety, and comfort and automation.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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