# Senior Java Developer at N-iX

> Open job at N-iX. Workplace: Remote (EU).

Source: Poland Dev Jobs, https://poland-devjobs.com/jobs/n-ix-senior-java-developer-yg19gno
Posted 29 October 2026. Last checked on the employer's career site: 31 October 2026.

## Facts

- Company: [N-iX](https://poland-devjobs.com/companies/n-ix)
- Location: Remote (EU)
- Workplace: Remote (EU)
- Employment type: Full-time
- Polish: Not required
- English: Fluent
- Skills: Azure, Java, Linux, SQL
- Not mentioned in the job post: salary, visa sponsorship, relocation, where you can apply from

## Job description

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 HTTP 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

##### Nice to Have

- Experience with AI-assisted migration tools (OpenRewrite, GitHub Copilot, Claude, Gemini, etc.)
- Knowledge of XSLT/XML transformations
- Experience migrating build systems from Ant to Maven or Gradle
- Experience with Azure DevOps
- Experience with large monolithic enterprise applications

**We offer*:**

- Flexible working format - remote, office-based or flexible
- A competitive salary and good compensation package
- Personalized career growth
- Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
- Active tech communities with regular knowledge sharing
- Education reimbursement
- Memorable anniversary presents
- Corporate events and team buildings
- Other location-specific benefits

*not applicable for freelancers

## How to apply

Apply on the job page, https://poland-devjobs.com/jobs/n-ix-senior-java-developer-yg19gno: its Apply button opens the employer's own application page.

## More jobs from N-iX

- [Senior Azure DevOps Engineer](https://poland-devjobs.com/jobs/n-ix-senior-azure-devops-engineer-njdy4kq): N-iX, On-site. Posted 30 October 2026.
- [Senior .NET Fullstack Engineer ( with Angular)](https://poland-devjobs.com/jobs/n-ix-senior-net-fullstack-engineer-with-angular-iqw67cf): N-iX, On-site. Posted 30 October 2026.
- [Senior Network Design Engineer](https://poland-devjobs.com/jobs/n-ix-senior-network-design-engineer-hmmdb88): N-iX, On-site. Posted 29 October 2026.
- [Senior Automation QA (C#) Engineer](https://poland-devjobs.com/jobs/n-ix-senior-automation-qa-c-engineer-0clftoz): N-iX, On-site. Posted 29 October 2026.
- [Senior Software Development Engineer (Amazon)](https://poland-devjobs.com/jobs/n-ix-senior-software-development-engineer-amazon-ka7y8or): N-iX, On-site. Posted 28 October 2026.