Principal Java Consultant, Budapest

ION Group

Budapest on site Until 8/21/2026 First posted July 18, 2025 Last posted July 18, 2025

Job description

Lab49 has an opportunity available for a Lead Java Engineer to lead work on complex and challenging projects to drive transformative change for our top- tier Financial Services clients. Operating in an Agile environment, the Java Engineer will have strong server-side experience to work on next- generation financial systems.

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

Required Skills and Experience

10+ years of hands-on experience designing and building complex, software applications, commercial-grade applications in core, server-side Java, ideally Java 8+
5+ years of experience leading Agile teams
Willingness to take responsibility for the team’s actions and outcomes
Ability to proactively make informed decisions based on the project and technology understanding
Strive to share knowledge, guide the team members, and lead learning sessions
Flexibility to adapt to changes in project requirements, technology, and team composition
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.

Lab49/ION is committed to maintaining a supportive and inclusive environment for people with diverse backgrounds and experiences. We respect the varied identities, abilities, cultures, and traditions of the individuals who comprise our organization and recognize the value that different backgrounds and points of view bring to our business.

Lab49/ION adheres to an equal employment opportunity policy that prohibits discriminatory practices or harassment against applicants or employees based on any legally impermissible factor.

About this role

Summary

Lead Java projects in financial services, focusing on distributed, reactive, server-side applications.

Job title

Principal Java Consultant

Experience level

10+ years

Industry

finance

Location requirements

Budapest, on-site work required

Salary

Not specified

Management role

Yes

Skills & keywords

Required skills

Java 8+AgileRESTful Web Servicesunit testingCI/CD

Preferred skills

ScalaSpringHibernateMavenmultithreading

Specializations

Javadistributed systemsreactive programmingfinancial technology

Locations

Structured locations inferred from the posting.

Budapest, Hungary

On-site City