Senior Java Developer

What you will do

You'll be part of the Client Lifecycle Management, IB Digital Operations team in Krakow, working on a highly customizable solution to assist with onboarding and maintaining clients from over 90 countries.

The project involves generating data-driven requirements for capturing documents and data based on data taxonomy, utilizing microservices architecture, Azure Kubernetes Service, and Spring Boot.

lay a key role in designing and building highly scalable and distributed cloud applications.

Provide technology solutions that will solve business problems and strengthen our position as digital leaders in financial services.

Design, plan, and deliver sustainable solutions using modern technologies.

Embrace state-of-the-art AI tools to deliver better, well-tailored solutions.

Implement proofs of concept and application skeletons for the rest of the team.

Participate in or lead design reviews with peers and stakeholders to decide on architecture.

Take part in building modern CI/CD solutions to reduce lead time.

Requirements

MUST

• At least 8+ years of practical experience in enterprise-level Java development and delivering production systems.
• Advanced proficiency in JVM languages (ideally Java 11+), including strong command of design patterns, SOLID principles, and Clean Code practices.
• Solid understanding of distributed microservices architectures, service communication patterns as message queues (e.g., Kafka), and API design (REST), ideally with Spring Boot.
• At least two backend large-scale solutions successfully delivered to production, ideally involving high-throughput APIs, event-driven systems, or complex business workflows.
• Practical, hands-on experience with relational and document databases (e.g., PostgreSQL/Oracle and MongoDB/CosmosDB), caching layers, and message queues.
• Strong grasp of software engineering fundamentals: data structures, algorithms, concurrency, asynchronous/reactive programming, and transaction management.
• Solid understanding of testing practices: unit, integration plus CI/CD pipelines (e.g., GitLab CI/CD).
• Ability to evaluate trade-offs and select appropriate tools, frameworks, and architectural patterns for a given problem.
• Familiarity with cloud-based technologies and container orchestration (Docker, Kubernetes), ideally with Azure, AWS, or GCP.
• Strong debugging, profiling, and optimization skills for high-performance JVM applications.
• Experience with Agile mode of working, plus excellent communication and collaboration skills.
• Experience using agentic LLMs to support the development process.

NICE TO HAVE

• Experience in, or willingness to learn, Java reactive programming / Spring WebFlux.
• Experience with NoSQL databases (ideally MongoDB or CosmosDB).
• Familiarity with BPMN workflow engines (e.g., Flowable).
• Experience with infrastructure-as-code and observability tooling (metrics, tracing, logging).