Senior Java Developer (Spark & Spring Boot)

Salary: 900 - 1200 PLN/MD

Remote:  Flexible hybrid from Gdańsk (expected in the office 1 day/week)

 

Why choose this offer?

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• You can expect a flexible work organization
• The international work environment will allow you to interact with the English language daily
• Scandinavian organizational culture will provide you with work-life balance, you will gain time for additional training (financed by Jit)
• The Jit community will bring you a nice time during regular integration meetings

 

Project

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Join the team responsible for processing, enriching, and distributing financial event data within an organization. It serves as a middle-office solution that bridges the gap between front-office operations (where transactions and financial events originate) and back-office systems (which handle reporting, compliance, and financial reconciliation). The system ingests input events through Kafka, which are then enriched using multiple sources, including Kafka, gRPC, direct database access (for legacy systems), and other solutions. For data persistence, the platform currently relies on OracleDB with Flyway, but a transition to a more scalable Big Data storage solution is under consideration to better accommodate growing data volumes. To efficiently handle large-scale data processing, the system utilizes Apache Spark. The current infrastructure is based on a dedicated Spark cluster, but efforts are underway to migrate to Cloudera Data Platform, which will enhance scalability, reliability, and overall data management.

The development and maintenance of the platform are centered around Java, with services built using Spring Boot, Spring Batch, and Spring Kafka. The system is deployed and managed using Kubernetes, ensuring flexibility and resilience in handling workloads. The deployment process is automated through Bitbucket and Bamboo CI/CD, while Ansible is used for managing infrastructure as code. Business teams interact with the system using Jupyter Notebooks powered by Python and Spark, enabling data analysis and insights generation. The project is executed within the SAFe Agile framework, with teams collaborating across Poland and Denmark. Task management is facilitated through JIRA, and documentation is maintained in Confluence.

Required Skills

• Java (2+ years of experience) – Strong understanding of backend development, with hands-on experience in building and maintaining Java applications.
• Apache Spark – Experience in processing large-scale event data using Spark, including data transformations and optimizations.
• Spring Boot – Knowledge of developing microservices using the Spring Boot framework, including dependency injection, REST APIs, and database integration.

Nice to Have

• OracleDB – Familiarity with relational database management, SQL queries, and schema migrations using Flyway.
• Git – Proficiency in version control and collaborative development using Git.
• CI/CD Pipelines (Bamboo, Bitbucket) – Experience in implementing and maintaining CI/CD pipelines for automated testing and deployments.
• Kafka (as a Communication Layer) – Understanding of event-driven architectures and real-time data streaming with Kafka.
• Cloudera Data Platform – Knowledge of big data infrastructure, including transitioning from on-prem Spark clusters to managed solutions.
• Ansible – Experience in infrastructure automation and configuration management.
• Kubernetes (k8s) & Docker – Understanding of containerization and orchestration for microservices deployment.

 

What you'll be doing

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• Processing and enriching data from Kafka events using Apache Spark
• Developing and maintaining backend services with Java (Spring Boot, Spring Batch, Spring Kafka)
• Optimizing and transitioning the Spark infrastructure to Cloudera Data Platform
• Integrating with multiple data sources, including gRPC services, Kafka topics, and legacy databases
• Managing CI/CD pipelines with Bitbucket and Bamboo
• Deploying and maintaining Java-based microservices using Kubernetes
• Implementing infrastructure automation with Ansible
• Collaborating in an Agile SAFe environment across multiple locations
• Supporting business teams using Jupyter Notebooks (Python + Spark) for data analysis
• Ensuring software quality through Cucumber/Gherkin-based testing

 

Technologies you'll work with

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• Java (2+ years of experience)
• Apache Spark
• Spring Boot
• OracleDB
• Git
• Bamboo (CI/CD tools)
• Kafka (as a communication layer)
• Cloudera
• Ansible
• Kubernetes (K8s)
• Docker

 

Client – why choose this particular client from the Jit portfolio?

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Jit Team has had an over-decade-long relationship with the leading financial group in the Nordic countries, and we are privileged to be our client's premier partner in Poland. At present, over 200 Jit personnel are engaged in the completion of more than 60 projects for this Norwegian major provider of financial services with a global presence and a strong focus on modern technology. Our customer's work atmosphere is epitomized by the Scandinavian culture, which is conducive to people who place emphasis on work-life balance and feedback culture. Furthermore, all projects are executed in international teams, giving constant exposure to the English language. 

 

About Jit Team

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The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 500 experienced experts. We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme.

Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity. By supporting indigenous initiatives, we ensure the circulation of good energy.