Middle Java/Kotlin Developer (Cloud Development Department)

Ajax Systems is a full-cycle company working from idea generation and R&D to mass production and sales. We create security solutions for residential and commercial properties, with a portfolio of 280+ devices across intrusion protection, video surveillance, fire safety, and automation. The whole team is in one office in Lviv, all technical and product decisions are made locally.

We’re looking for an Java Developer to join us and continue the evolution of a product that we love: someone who takes pride in their work to ensure that user experience and development quality are superb. You will be able to develop the apps in the best hardware company of Ukraine with around 300M active users around the world. Moreover, very soon you will have a chance to start several new products from scratch.

Responsibilities:

Core Development

• Design and implement core backend services and data pipelines
• Write clean, readable, and maintainable code
  
  
  

Architecture & Documentation

• Participate in designing and improving system architecture
• Document architectural decisions and operational processes to support reliable deployment and service operations
  
  
  

Quality Assurance

• Ensure proper test coverage (unit and integration tests)
• Optimize performance and cost efficiency within owned areas
• Follow and promote best practices in software design and development
  
  
  

Operations & Monitoring

• Set up and maintain alerting, dashboards, and runbooks for production services
• Debug production issues, analyze complex cases, and conduct investigations
  
  
  

Collaboration & Culture

• Work in an engineering culture focused on testing, Continuous Delivery, and DevOps
• Collaborate with team members and other engineering teams to deliver features aligned with business needs
  
  
  

Requirements:

Required Experience

• 3+ years of professional backend development in Java (enterprise environment)
• Strong understanding and practical experience with Java Concurrency
  
  
  

Architecture & Design

• Understanding of SOA, microservices, and event-driven architecture
• Practical experience with AWS and cloud development principles
• Experience building scalable, high-availability systems
  
  
  

Technologies & Tools

Required:

• Experience with NoSQL databases
• Experience with message brokers
• Familiarity with enterprise-grade stack (messaging systems, in-memory storage, key-value databases)
• Docker and Kubernetes
• Git, Gradle, Jenkins
  
  
  

Nice to Have:

• Redis, Netty, Akka
• gRPC, Project Reactor
• NATS, Kafka
• MongoDB
  
  
  

Testing & Quality

• Strong knowledge of unit testing
• Understanding of automated testing practices
  
  
  

What You Will Get

• Opportunity to propose and implement your own ideas with a real impact on the product and production
• Work in a highly motivated team with a zero-bullshit culture
• Competitive salary
• Health insurance
• Corporate English classes
• Compensation for professional development and learning
• Opportunity to participate in beta testing of Ajax security systems — get early access to and test new devices before their official release
  
  
  

Ajax Systems — це українська історія успіху, місце неймовірної сили та енергії.

Долучайтеся, щоб зробити Made in Ukraine 🇺🇦 синонімом надійності.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. 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.