Middle Java/Kotlin Developer (Cloud Development Department) in Lviv at Ajax Systems

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.