Senior Java Engineer

Senior Java Engineer - Global Customer Data Management Platform About the role Our client is a large international financial institution building a global, high-availability platform for managing customer data. The platform is the organisation's central system of record for customer information, serving retail, business, and wholesale client segments, and must be available 24/7 at high volume and high speed. You will join a multidisciplinary, international, stream-aligned agile team responsible for the full lifecycle of the systems it builds - from refining user stories with business stakeholders through development to running the software in production (BizDevOps). The team works with global APIs and collaborates closely with the Product Owner, Chapter/Journey Experts, and peer engineers to translate business requirements into working features. The organisation follows an inner-source model, meaning teams across the company can contribute to a shared codebase, and is organised for fast flow using Team Topologies principles. Responsibilities Design, build, and operate Spring Boot APIs following hexagonal architecture and domain-driven design principles.Own features end-to-end: from refining requirements with business and product stakeholders to writing clean, well-tested code and monitoring it in production.Validate implementations using behaviour-driven development (BDD) to ensure features work as intended.Collaborate with the Product Owner, business stakeholders, and peer engineers to translate business needs into technical solutions.Take initiative and help set technical direction within the team; challenge the status quo and propose improvements to quality, maintainability, and ease of use.Design reusable code components and libraries that can be leveraged across multiple teams and projects.Coach and mentor less experienced engineers.Participate in an on-call/standby rotation to support production systems outside office hours.Resolve production incidents, perform root-cause analysis, and use observability tooling to detect and prevent issues. Tech stack Java 21+ and Spring Boot (API development)Hexagonal architecture and Domain-Driven DesignDatabases: Cassandra, Neo4J (nice to have), Elasticsearch, Azure SQL, and a third-party MDM platformStreaming: KafkaBuild & testing: Maven, Cucumber (BDD)CI/CD pipelinesObservability: Prometheus, Grafana, ELKAI-assisted development: GitHub Copilot - working with agents, skills, etc. Must-have requirements 6-8 years of professional experience developing with Java and Spring technologies.Strong hands-on experience with Java 21 and Spring Boot for API development.Experience with hexagonal architecture and domain-driven design.Solid grounding in software best practices: TDD, BDD, DDD, and clean code.Proven experience running software in production, including incident resolution and monitoring.Experience with streaming technologies, specifically Kafka.Experience with NoSQL and relational databases (e.g. Neo4J, DB2, Cassandra, Elasticsearch) - Neo4J experience is a strong plus.Demonstrated ability to coach and mentor less experienced team members.Ownership mindset - able to take initiative and lead on technical direction.Strong communication and stakeholder-management skills.Experience working in a corporate and/or financial agile environment (DevOps, Scrum). Fluent Dutch is not required. Nice-to-have Experience with AI tools - working with agents, skills, etc., using GitHub Copilot.Neo4J experience.Experience at a large international bank. Working conditions Standby/on-call duty approximately 3-4 times per year (roughly one week of standby annually), compensated. This starts around 6 months after onboarding.Production releases are scheduled within a defined change window of 06:00-12:00.A motivational letter is appreciated but optional. 3 core skills for candidate screening Java, Spring Boot, Kafka (backend-oriented) - 6-8 years of experience.