Java Developer

Ubique Systems; Amsterdam; On-site; EUR 90,000 - 120,000; Full time

Job summary

Ubique Systems in Amsterdam is seeking an experienced lead Java developer to drive back-end platforms. You will oversee a large team, collaborate with multiple domains, and deliver robust Java applications with Spring Boot in a DevOps-friendly environment.

Responsibilities include design, development, and documentation of software, with strong emphasis on integration, concurrency, and testing using JUnit/Mockito. Experience in payments domains is a plus.

Qualifications

• Experience in leading a team handling large Java development projects.
• Strong back-end Java experience with adherence to coding standards.
• Hands-on with Java 21 and modern OO concepts.
• Experience with Kafka and messaging queues and integration tasks.
• Knowledge of the payments domain (SEPA/SWIFT) is a plus.
• Proficient in Spring / Spring Boot, REST/MVC, and unit testing (JUnit/Mockito).

Responsibilities

• Lead a team through end-to-end Java development cycles and ensure collaboration with Business, Architecture, Operations, and Platform teams.
• Design, develop, and maintain advanced Java-based applications and ensure code quality.
• Document software designs and technical specifications.
• Implement robust error handling, concurrency, and performance best practices.
• Work with database technologies including Cassandra and SQL-based systems.

Skills

Leading a Team

Java development

DevOps experience

Integration

Kafka

Messaging Queues

SQL

Cassandra

Java 21

OOP / Core Java

Spring / Spring Boot

REST / MVC

JUnit / Mockito

Multithreading

Lambda / Stream API

Dependency Injection

Spring Bean Lifecycle

Tools

Kafka

Messaging Queues

SQL

Cassandra

Job description

Experience in Leading a Team for 2 complete Java development cycle (preferable E2E Java development with Java/Devops experience)

• Should have experience in handling a large team & collaborate with Business team, Architecture team and Operations (Ops) and Platform team for building Java applications, assess technical risk and Debts. Should be very good in integration.
• Design, develop, and maintain advanced Java-based applications (back-end Development), adhering to coding standards and best practices.
• Good understanding of Payments Domain – with European payments such as SEPA and SWIFT messaging services
• Strong knowledge of Java programming language ’Java 21 ‘and object-oriented concepts
• Should have worked in Kafka & Messaging Queues
• Should have experience with Casandra databases, SQL.
• Document software designs, technical specifications, and code changes.
• Should have strong skills in OOPS, Collections, exception handling, concurrent programming, lambda expressions, stream API, Multithreading , (Dependency Injection, Spring Bean Lifecycle, Auto wiring, Spring Boot features, initializers, starters, autoconfiguration, profile, etc)
• Understanding of MVC/ REST ( Spring MVC Flow, Model&View, REST architecture, resources, HTTP methods and usage, URI mappings)
• Perform Unit testing and should have experience in JUNIT, frameworks like Junit / Mockito