Senior Java Engineer

Description Ciklum; Polska; Remote; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Premium medical package

MyBenefit cafeteria

Udemy access & language courses

Company-paid certifications

Job summary

Ciklum is seeking a Senior Java Engineer to join our Poland team. You will work in a cross-functional group delivering backend services, REST APIs, and cloud-native architectures. The role emphasizes design, testing, deployment, and continuous improvement within an agile, collaborative environment.

You will design robust microservices, implement serverless data flows, and ensure secure integrations with external partners while maintaining high-quality documentation and code standards.

Qualifications

• 5+ years of backend development experience.
• Strong Java and Spring Boot skills; deep knowledge of the language and ecosystem.
• Experience designing, consuming and architecting REST APIs.
• Cloud and serverless: hands-on AWS services (Lambda, DynamoDB, S3, SQS, EventBridge).
• Event streaming: Kafka or similar messaging systems.
• Databases: NoSQL and caching (DynamoDB, Redis).
• Authentication: OAuth 2.0 and secure data handling.
• Testing: unit and integration tests for distributed systems.
• Architecture: create sequence diagrams and technical docs from requirements.
• DevOps/CI-CD: proficiency with GitLab CI/CD.

Responsibilities

• 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 apps and data pipelines on Kafka and queues
• Integrate with third-party partners: secure integrations with external APIs, including Auth flows and webhooks
• Document system architecture: create sequence diagrams showing service interactions and data flows
• Manage data stores: design and maintain databases and caching with strong data modeling
• Apply DevOps practices: improve CI/CD pipelines in GitLab CI/CD for fast, reliable builds and deployments
• Run infrastructure as code: use Terraform and Kubernetes to manage infra across cloud regions
• Operate what you build: monitor production services and troubleshoot incidents
• Collaborate with the team: review code and share knowledge
• Work in an agile way: Lite Agile environment and adapt to changes

Skills

Java

Spring Boot

API design

AWS

Kafka

NoSQL databases

OAuth 2.0

CI/CD

Kubernetes

Terraform

English

AI-assisted development

Tools

GitLab CI/CD

Terraform

Kubernetes

Kafka

Job description

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.

About the role:

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.

Responsibilities:

• 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 DevOps practices:manage and improve CI/CD pipelines in GitLab 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

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 EventBridge
• Event streaming:experience with Kafka or similar messaging systems
• Databases:hands-on experience with NoSQL 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
• DevOps and CI/CD:proficiency with CI/CD tools, especially GitLab 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-on 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

What’s in it for you?

• 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 diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies
• Flexibility: Enjoy flexibility - full remote working possibilities
• Care: We've got you covered with company-paid premium medical package through Luxmed
• Benefits: Access the MyBenefit cafeteria platform, allowing you to choose perks that best suit your lifestyle and needs

About us:

At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.

With delivery centers in Wrocław and Gdańsk, our 300+ professionals in Poland drive forward-thinking solutions for global clients. Join a community where collaboration sparks innovation - your impact reaches millions.

Explore, empower, engineer with Ciklum!