Senior Java Engineer

Ciklum is looking for a Senior Java Engineer to join our team full-time in Poland.

We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.

As a Senior Java Engineer, become a part of a cross-functional development team engineering experiences of tomorrow.

An American partner known for selling and distributing tickets for various events. One of the leading providers of booking and ticketing services in the arts and entertainment industry, operating on a global scale.

• Own the full software development lifecycle: design, development, testing, deployment and maintenance
• Design and build backend services: develop RESTful APIs and microservices with Java and Spring Boot
• Build serverless and event-driven systems: serverless application services and data pipelines on Kafka, queues
• Integrate with third-party partners: build and maintain secure integrations with external APIs, including Auth flows and webhooks
• Document system architecture: create and maintain sequence diagrams that show how services interact and how data flows between them
• Manage data stores: design, implement and maintain databases and caching layers, with a focus on data modeling, integrity, performance and maintainability
• Apply Dev Ops practices: manage and improve CI/CD pipelines in Git Lab CI/CD for fast, reliable builds, tests and deployments
• Run infrastructure as code: use Terraform and Kubernetes to manage infrastructure and scale services across multiple cloud regions
• Operate what you build: monitor production services, investigate incidents and keep systems reliable during high-traffic events
• Collaborate with the team: review code, give constructive feedback and share knowledge
• Work in an agile way: work in a Lite Agile environment and adapt to changing requirements

• 5+ years of backend development experience
• Strong Java and Spring Boot skills: deep knowledge of the language, the Spring ecosystem and build tooling such as Gradle
• API design: experience designing, consuming and architecting REST APIs
• Cloud and serverless: hands‑on experience with AWS services such as Lambda, DynamoDB, S3, SQS and Event Bridge
• Event streaming: experience with Kafka or similar messaging systems
• Databases: hands‑on experience with No
  
  SQL databases and caching (for example DynamoDB and Redis)
• Authentication: solid understanding of OAuth 2.0 and secure handling of user data
• Testing: experience writing unit and integration tests for distributed systems
• Architecture and dependency analysis: able to produce sequence diagrams and technical documentation from implementation requirements
• Dev Ops and CI/CD: proficiency with CI/CD tools, especially Git Lab CI/CD
• Kubernetes and Terraform: experience with both for container orchestration and infrastructure management
• Fluent English: excellent written and spoken communication
• Openness and adaptability: willing to learn new tools and technologies as needed
• AI-assisted development: hands‑off experience with AI coding assistants such as in day‑to‑day work, and the judgment to review and validate AI‑generated code before it ships

• Strong community:
  Work alongside top professionals in a friendly, open-door environment
• Growth focus:
  Take on large-scale projects with a global impact and expand your expertise
• Tailored learning:
  Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications
• Endless opportunities:
  Explore…