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, WARdeployed 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 (supporting, not primary)

• 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 othe

Required Skills

Java Full-Stack Developer 5+ years professional Java development experience