N-iX is looking for a Senior Java Developer to join a long-term modernization initiative for a large US-based provider of marketing, packaging, print, and supply chain services serving Fortune-level clients worldwide.
You will work within the customer's European supply chain division, supporting warehousing, fulfillment, kitting, and packaging operations for global brands in electronics, medical devices, and consumer products. The main stakeholder is a Software Development Manager who originally built the system and remains deeply involved in its technical evolution.
About the Project
The project focuses on a customer-facing web portal that has been operating successfully for over two decades. The portal enables customers, suppliers, and partners to:
View inventory, goods, and shipment reports
Exchange files securely
Submit forecasts and operational data
Access supply chain information
The system has been in maintenance mode for several years and now requires a strategic technology uplift to address security vulnerabilities and ensure continued support for the next 5–7 years. This is not a rewrite project . The goal is a cost-effective modernization of the existing platform while preserving business-critical functionality.
Technology Stack
Java 8
Struts 1.1
STXX (XML/XSLT)
Apache Tomcat 9
Apache Server
Linux
Ant
Azure DevOps
Data & Integrations:
Microsoft SQL Server
Oracle Database
Stored Procedures
LDAP
SFTP
Email integrations
Application Size:
- 200,000+ lines of Java code
- Monolithic architecture
- No automated test coverage currently in place
Responsibilities
Lead and execute the migration of a large legacy Java application
Upgrade Java versions and modernize the framework stack
Perform migration from javax to jakarta
Upgrade dependencies and address security vulnerabilities
Analyze and refactor legacy code where required
Create unit and integration tests for existing functionality
Support regression testing activities
Collaborate closely with the customer’s technical stakeholders
Deliver early security improvements and test coverage for critical business flows during the initial project phase
Requirements
Must Have
- 5+ years of commercial experience with Java
- Proven experience working with Struts 1.x
- Experience with Java version upgrades and/or framework migration projects
- Strong knowledge of Apache Tomcat and Linux environments
- Experience working with SQL Server and Oracle databases
- Solid understanding of JDBC and stored procedures
- Experience testing and maintaining legacy applications
- Strong problem-solving and debugging skills
- Fluent spoken and written English
- Based in the EU