Senior Java Full-Stack Developer

Experience Required

• 5-8+ years of professional Java development experience
• Minimum 3 years working with Spring Framework in production (both classic Spring MVC and Spring Boot)
• Experience maintaining legacy enterprise Java applications alongside modern microservices is a strong plus

Core Responsibilities

• Maintain and extend a Java 21 / Spring 6.2.x MVC / Hibernate 6.6.x order fulfillment backend for visa, passport, and travel document services (not Spring Boot - manually configured, WAR deployed to Tomcat)
• Design, build, and support Spring Boot microservices that integrate with other platform services
• Work across two parallel data-access stacks in the platform: a legacy precompiled framework and a modern JPA/Hibernate stack - both operating on shared database tables
• Develop and maintain JSP/Servlet views alongside newer Spring MVC views, plus supporting jQuery/JavaScript
• Write and manage Flyway database migrations (MySQL/MariaDB) across multi-country/multidomain deployment configurations
• Implement and troubleshoot audit trails (Javers), authentication/SSO (SAML via OneLogin, JWT), and authorization/IDOR protections across orders, payments, debtors, and documents
• Support payment processor integrations with correct handling of PCI-sensitive data and financial precision (BigDecimal)
• Generate reports and PDFs via JasperReports and iTextPDF
• Build, containerize, and deploy services using Docker, front them with Nginx, and operate them on Linux servers
• Maintain and extend Jenkins CI/CD pipelines (Groovy pipeline scripts) for build, test, and deployment automation, including ad-hoc Flyway migration pipelines
• Collaborate with QA/DevOps to troubleshoot production issues across the monolith and microservices, including cross-service data consistency (orders, milestones, billing)

Required Technical Skills

Languages Core

• Java 17/21 (strong OOP, collections, concurrency fundamentals)
• SQL (MySQL/MariaDB), schema design, query optimization

Frameworks

• Spring Framework 6.x (Core, MVC, Data JPA, TX, AOP) in a non-Boot, manually configured setup
• Spring Boot 3.x for microservices development (REST APIs, auto-configuration, embedded Tomcat)
• Hibernate/JPA 6.x (entity mapping, inheritance strategies, lazy loading pitfalls)
• JSP, JSTL, Servlets (legacy web tier)

Data Migrations

• Flyway (versioned and repeatable migrations, multi-environment strategy)

Security Integration

• SAML SSO (OneLogin or equivalent), JWT-based authentication
• REST API design; exposure to SOAP/WSDL a plus
• Awareness of OWASP Top 10, especially IDOR/access-control issues in multi-tenant order/billing data

Reporting

• JasperReports and/or iTextPDF (report/PDF generation experience)

Frontend

• jQuery / vanilla JavaScript
• Exposure to a modern frontend (React) is a plus, as some admin tooling is React-based

Build Tooling

• Gradle (multi-project builds, custom tasks/plugins)
• Git

DevOps / Infrastructure

• Docker (building/running containers, multi-service compose setups)
• Nginx (reverse proxy/routing configuration)
• Linux (comfortable administering/debugging services on Linux servers)
• Jenkins (writing/maintaining Groovy pipeline scripts, CI/CD for build+deploy)

Nice to Have

• Prior experience in travel, visa/passport processing, fintech, or order-management domains
• Experience with audit/versioning libraries (e.g., Javers) or similar change-tracking systems
• Exposure to Joda-Time and date/timezone handling across multi-country deployments
• Familiarity with microservice patterns: service-to-service communication, eventual consistency, distributed transactions across a monolith + microservices boundary

Soft Skills / Working Style

• Comfortable navigating and safely modifying a large legacy codebase without full documentation - must exercise judgment on what's safe to change vs. what's tribal-knowledge-dependent
• Strong attention to financial and PII data handling given the sensitive nature of orders, payments, and travel documents
• Ability to work across both monolith maintenance and new microservice development without forcing one architectural style onto the other

Disclaimer: This job posting has been aggregated from external source. Role details, content, and availability are subject to change. Applicants are advised to confirm the latest information directly on the company website before applying.