Senior Java Developer: Modernization & Jakarta Upgrade

N-iX

España

Hybrid

EUR 70,000 - 110,000

Full time

4 days ago

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Benefits offered by this job

Flexible working format

Competitive salary

Mentorship program

Tech talks and trainings

Job summary

N-iX seeks a Senior Java Developer to join a long-term modernization program for a US-based provider serving Fortune-level clients. You will migrate a large, legacy Java application, upgrade Java versions, and move from javax to jakarta while preserving critical functions.

The role involves upgrading dependencies, addressing security vulnerabilities, and creating tests to ensure stable delivery. Strong English and EU residency are required.

Qualifications

5+ years of commercial experience with Java.
Proven experience with Struts 1.x and Java version upgrades.
Strong knowledge of Apache Tomcat and Linux environments.
Experience with SQL Server and Oracle databases; JDBC and stored procedures.
Experience testing and maintaining legacy applications; debugging skills.
Fluent English; EU-based location.

Responsibilities

Lead and execute migration of a large legacy Java application.
Upgrade Java versions and modernize the framework stack.
Migrate from javax to jakarta and upgrade dependencies.
Address security vulnerabilities and refactor legacy code as needed.
Create unit and integration tests; support regression testing.
Collaborate with customer stakeholders and ensure timely delivery.

Skills

Java

Struts 1.x

Java upgrades

Tomcat

Linux

SQL Server

Oracle

JDBC

Debugging

English

Tools

Ant

Tomcat

Maven/Gradle

XML/XSLT

XSLT/XML transformations

Job description

The role involves upgrading dependencies, addressing security vulnerabilities, and creating tests to ensure stable delivery. Strong English and EU residency are required.

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