Senior Java Engineer

Levy Professionals; Amsterdam; On-site; EUR 90,000 - 130,000; Full time

Job summary

Levy Professionals is seeking a Senior Java Engineer to join a global customer data management platform for a major international financial institution. You will design, build, and operate Spring Boot APIs following hexagonal architecture and domain-driven design, owning features end-to-end from requirements to production.

You will mentor colleagues, participate in BizDevOps, and handle on-call incidents with strong focus on quality, testing (BDD/TDD), observability, and collaboration with

Qualifications

• 6-8 years of professional experience 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).
• 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 in a corporate/financial agile environment (DevOps, Scrum). Fluent Dutch not required.

Responsibilities

• Design, build, and operate Spring Boot APIs following hexagonal architecture and domain-driven design principles.
• Own features end-to-end: refining requirements with stakeholders to writing clean, well-tested code and monitoring in production.
• Validate implementations using behaviour-driven development (BDD) to ensure features work as intended.
• Collaborate with Product Owner and engineers to translate business needs into technical solutions.
• Take initiative and help set technical direction within the team; propose improvements.
• Design reusable code components and libraries for cross-team use.
• Coach and mentor less experienced engineers.
• Participate in on-call/standby rotation to support production systems.
• Resolve production incidents with root-cause analysis and observability tooling.

Skills

Java

Spring Boot

Kafka

BDD

DDD

TDD

Mentoring

Tools

Maven

Cucumber

GitHub Copilot

Job description

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 Design
• Databases: Cassandra, Neo4J (nice to have), Elasticsearch, Azure SQL, and a third-party MDM platform
• Streaming: Kafka
• Build & testing: Maven, Cucumber (BDD)
• CI/CD pipelines
• Observability: Prometheus, Grafana, ELK
• AI-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.