Principal Java Developer

Responsibilities:

• Lead end-to-end development with Java (Quarkus/Spring) backend and React/TypeScript frontend, ensuring architectural consistency
• Drive adoption of AI-assisted tools like Claude Code, guide prompt engineering, review AI-generated code, and integrate AI securely
• Architect and implement scalable Java microservices and APIs with maintainable, testable code
• Design and optimize MongoDB and PostgreSQL databases including schema, indexing, data modeling, queries, and migrations
• Build event-driven systems with Kafka, implement event sourcing, reliable messaging, and integrate with ELK monitoring
• Identify and resolve performance bottlenecks across frontend, backend, and databases, applying monitoring and optimization strategies
• Maintain CI/CD pipelines in Jenkins, integrate SonarQube, Snyk, OWASP, manage Nexus repositories, automate deployments, IaC, and container orchestration
• Define comprehensive testing strategies: unit, integration, end-to-end, performance, and security testing
• Ensure full-stack security: secure coding, authentication/authorization, vulnerability and secrets management, compliance
• Provide technical leadership, mentorship, code reviews, set standards, and make key architectural decisions
• Integrate AI/ML services, LLM APIs, and intelligent automation, applying responsible AI practices
• Collaborate with product, architecture, security, and business teams to translate requirements into technical solutions
• Take full ownership of features and systems from design to deployment and maintenance

Requirements:

• 10+ years in software development, including 3–5 years in senior/principal roles with technical leadership
• 8+ years Java (Quarkus/Spring Boot) with Maven/Gradle, JVM internals, performance tuning, and scalable enterprise apps
• Full-stack expertise with React, TypeScript/JavaScript (ES6+), HTML5, CSS3, responsive design, Redux/Context API, and frontend optimization
• Advanced MongoDB and PostgreSQL skills, including queries, indexing, replication, sharding, migrations, and data modeling
• Experience with Kafka event-driven architectures and monitoring tools (ELK, Prometheus, Grafana)
• DevOps and CI/CD skills with Docker, Kubernetes, Jenkins, SonarQube, Nexus, GitOps, Terraform/Ansible, and container orchestration
• Experience with AI-assisted development (Claude Code, GitHub Copilot), LLM APIs, prompt engineering, and AI/ML frameworks
• Strong testing skills: JUnit, Mockito, Testcontainers, Jest, React Testing Library, Selenium/Cypress, JMeter, Gatling
• Security expertise: secure coding, OAuth2/JWT/OIDC, vulnerability management, and compliance
• Performance engineering with profiling tools (JProfiler, VisualVM, Chrome DevTools) and APMs (New Relic, Dynatrace, AppDynamics)
• Agile/Scrum experience, mentoring, technical decision-making, and process improvement
• Strong communication, collaboration, and end-to-end ownership of initiatives
• Passion for emerging technologies, AI-assisted development, and innovation

Nice to have:

• Experience with additional frontend frameworks (Vue.js, Angular)
• Knowledge of GraphQL and API design patterns
• Familiarity with observability platforms and distributed tracing
• Experience in the aviation or air traffic management domain
• Understanding of AIXM (Aeronautical Information Exchange Model) or aeronautical data standards
• Contributions to open-source projects or technical community engagement
• Certifications in relevant technologies (AWS, Kubernetes, Java, etc.)

Offer:

• Private medical care
• Co-financing for the sports card
• Constant support of dedicated consultant
• Employee referral program