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Senior Java Consultant, Budapest

ION· Lab49 – Software Engineering
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BudapestFull-timePosted 11mo ago

About the role

Senior Java Consultant position based in Budapest with on-site full-time work at Lab49 (ION Group). Focus on distributed systems, JVM-based server-side development, and collaboration with clients in iterative projects. Opportunity to work with new technologies, research initiatives, and cross-stack experience.

Responsibilities

  • Build distributed systems that deal with actor-based concurrency, reactive programming, distributed in-memory data grids, messaging that goes beyond plain JMS as we fully expect to participate in shaping the future of financial technology stacks.
  • Work on server side JVM-based projects.
  • Hit the ground running with the typical Java or Scala JVM ecosystem stack (Spring and its subprojects, Guice, Guava, Maven, Hibernate, Jetty, etc.).
  • Retool continuously as the technology landscape changes every few years.
  • Be able to pick up other technologies along the whole development stack, including front-end and other non-JVM ecosystems.
  • Work with our clients in iterative, project-based engagements, where self-organizing and focused teams move quickly to build innovative solutions for the client.
  • Have the desire to collaborate, and like sharing and learning from your colleagues.
  • Be passionate about delivering quality code.
  • Demonstrate experience writing commercial-grade software applications.
  • Have a deep understanding of multithreading and real-time software architectures.
  • Have an abiding interest in and competence for solving real-world business problems (with technology as an enabler).
  • Be determined to succeed despite obstacles and challenges, as well as a positive attitude favoring achievement of goals over open-ended investigation.

Qualifications

  • 7+ years of recent hands-on experience in designing and coding complex, enterprise, commercial-grade applications in core, server-side Java, ideally Java 8+.
  • Experience building RESTful Web Services.
  • Test-driven development, which includes Unit and End-to-End Testing.
  • Experience with Agile software development (e.g. SCRUM or KANBAN).
  • Experience in a CI/CD environment.
  • Bachelors or Masters in Computer Science, Engineering, Physics, Math, or related work experience.
  • Experience with, knowledge of, and strong demonstrated interest in, global financial markets and financial products.

Skills

Required:JavaRESTful Web ServicesTest-driven developmentAgile methodologies (SCRUM/KANBAN)CI/CDDistributed systems
Nice to have:Scala
Last updated Oct 21, 2026. Interested? Apply on the company site.

About ION

Reinventing the way business is done through automation technology

ION financial software improves decision making, simplifies complicated processes and empowers you by providing the right tools.

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