Team Lead Java Developer

*This position is fully remote only for employment in Bulgaria. However, people can also work in one of our offices in Sofia or Varna if they prefer to.

About DataArt

DataArt is a global software engineering firm and a trusted technology partner for market leaders and visionaries. Our world-class team designs and engineers data-driven, cloud-native solutions to deliver immediate and enduring business value.

We promote a culture of radical respect, prioritizing your personal well-being as much as your expertise. We stand firmly against prejudice and inequality, valuing each of our employees equally.

We respect the autonomy of others before all else, offering remote, onsite, and hybrid work options. Our Learning and development centers, R&D labs, and mentorship programs encourage professional growth.

Our long-term approach to collaboration with clients and colleagues alike focuses on building partnerships that extend beyond one-off projects. We provide the ability to switch between projects and technology stacks, creating opportunities for exploration through our learning and networking systems to advance your career.

Position Overview

Our client is one of the world’s top 10 investment companies with headquarters in Great Britain, with branch offices in the US and Hong Kong.

The IT environment of this company is constantly growing: there are around 30 programs and more than 60 projects actively developing at present. During the next 5 years, they are going to replace 150 out of 400 systems and integrate the US, HK, and UK environments.

The project focuses on modernizing the current ecosystem of Java-based microservices by identifying, migrating, and decommissioning outdated services. The initial analysis phase has already determined which services require a version upgrade within their existing framework (Spring Boot → Spring Boot, Quarkus → Quarkus), which services must be fully migrated from legacy MicroProfile frameworks (KumuluzEE, Thorntail → Quarkus), and which ones should be retired.

The next stage of the project centers on executing these migrations. This includes refactoring service codebases, updating configurations and dependencies, and aligning each service with Quarkus and MicroProfile standards. The team will adapt or replace legacy components, update build pipelines (Maven), and ensure compatibility with modern deployment environments such as OpenShift/Kubernetes and connectivity with other services (e.g., SMTP relays, queues, Azure Entra ID, etc).

Each migrated service will undergo functional, integration, and performance testing to validate stability and correctness. The project also involves close collaboration with technical owners and DevOps teams to ensure smooth deployment and proper documentation of migration results.

We are seeking a skilled Team Lead Java Developer to drive the modernization of our Java-based microservices ecosystem. In this pivotal role, you will lead the migration and upgrade of legacy services originally developed using frameworks like KumuluzEE, Thorntail, Spring Boot, and Quarkus towards a streamlined, cloud native architecture centered on Quarkus and MicroProfile standards.

Resoponsibilities

• Perform the end-to-end migration of selected services from KumuluzEE and Thorntail to Quarkus, based on the refined migration plan
• Refactor service code, configurations, and dependencies to align with Quarkus standards and MicroProfile specifications
• Replace or adapt legacy components and libraries with Quarkus-compatible alternatives
• Perform an upgrade of selected Spring Boot services from Spring Boot 1.x and 2.x versions to the latest version
• Perform an upgrade of selected Quarkus services from Quarkus 1.x and 2.x versions to the latest version
• Update build and packaging processes (Maven) to support the new runtime and deployment model
• Validate the migrated services through functional, integration, and performance testing
• Troubleshoot migration issues, resolve incompatibilities, and adjust service architecture where required
• Collaborate with the service tech owners and development teams to prepare and deploy migrated services to OpenShift environments
• Ensure proper documentation of all migration changes and provide final assessments and recommendations for further improvements
• Guide and mentor the development team throughout the migration process, ensuring technical consistency and adherence to best practices
• Coordinate migration priorities, workload distribution, and timelines across multiple teams and stakeholders
• Review and validate technical solutions, architectural changes, and migration approaches proposed by developers
• Act as a primary technical point of contact for the client, providing progress updates, risk assessments, and strategic recommendations
• Ensure quality standards, code reviews, and compliance with the organization

Requirements

• Proficient with Java versions 8 through 21, leveraging modern language features and enhancements
• Extensive experience in developing robust, scalable applications using Spring’s ecosystem
• Basic hands-on experience or strong theoretical understanding of Quarkus for building cloud-native applications
• Familiar with MicroProfile specifications, enabling efficient microservices development
• Skilled in designing and implementing microservices with a focus on scalability and maintainability
• Experienced in building and consuming REST APIs
• Proficient in project build and dependency management using Maven
• Practical knowledge of OpenShift and Kubernetes for the deployment and management of containerized applications
• Hands-on experience with Jenkins for continuous integration and continuous deployment pipelines
• Basic experience or strong theoretical knowledge of OAuth, Single Sign-On (SSO), and JWT for securing applications

Nice To Have

• Experienced with KumuluzEE and Thorntail microservices frameworks
• Knowledge of Microsoft Entra ID (Azure AD) integration
• Proficient in Kotlin
• Experienced with Apache Kafka for event streaming

What We Offer

• Unique corporate culture – no micromanagement, friendly atmosphere, freedom, and mutual respect
• Flexible schedule – ability to change projects, to work from home, and to try yourself in different roles
• Professional Development Map – a comprehensive map of your professional development within DataArt
• We hire people not for a project, but for the company. If the project (or your work in it) is over, you go to another project or to a paid “Idle”.
• Social benefits – additional health insurance, life insurance, sports card, etc.
• Opportunity to work from another DataArt office in a different city or country (temporarily or permanently)
• Free English courses
• Cozy office with a great atmosphere
• Snacks, drinks, and fruits are always available

^{reference number: JAV00255}