#134213 - Java Software Engineer - Application Modernization

Upwork • English • Java • 12 hours ago

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≈ $32k – $174k per year (Estimated)

Location

Remote (LATAM)

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Contractor

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Upwork

Upwork is an American freelance marketplace formed in 2015 from the merger of Elance and oDesk, and it connects businesses with independent professionals in software development, design, writing, marketing and increasingly artificial intelligence work. Its revenue comes from taking a percentage of what clients pay freelancers, which means it has spent years balancing take rate against the incentive for established pairs to leave the platform and transact directly. Headquartered in San Francisco and listed on Nasdaq, it has been positioning itself around higher-value professional work rather than competing at the commodity end of the market.

upwork.com • HQ: San Francisco, United States • IT Outsourcing • Professional Services • Human Resources • Marketplaces • 501-1000 employees • Est. 2015

We are seeking a hands-on Java Software Engineer to support a large-scale application modernization initiative. This role will help migrate more than 4,000 applications to current Spring Boot, Gradle, and Java versions while partnering with engineering teams to diagnose and resolve migration issues. The work requires deep familiarity with the Java open-source ecosystem and practical experience modernizing enterprise applications.

Key Responsibilities

- Support modernization across a large Java application ecosystem.

- Assist teams migrating more than 4,000 applications to the latest Spring Boot versions.

- Migrate applications to Spring Boot 3 and Spring Boot 4.

- Upgrade application builds from Gradle 8 to Gradle 9.

- Support application transitions from Java 17 to Java 25.

- Troubleshoot and resolve framework, build, dependency, and runtime migration issues.

- Collaborate with engineering teams throughout application migrations.

- Communicate migration findings, blockers, and resolutions clearly.

Must-Have Skills

- Strong hands-on experience with Java.

- Experience migrating applications to Spring Boot 3 and Spring Boot 4.

- Experience upgrading Gradle.

- Experience migrating applications from Java 17 to Java 25.

- Deep understanding of the Java open-source ecosystem.

- Experience troubleshooting and resolving application migration issues.

- Strong collaboration and communication skills.

- Ability to work flexible hours that overlap with the US team.

Nice-to-Have Skills

- Experience with large-scale application modernization or migration projects.

- Experience automating application migrations.

- Familiarity with AI tools.

- Familiarity with build optimization and dependency management.

- Experience working with enterprise Java applications at scale.

- Enterprise experience strongly preferred.

Required Tools & Platforms

- Java 17 and Java 25.

- Spring Boot 3 and Spring Boot 4.

- Gradle 8 and Gradle 9.

Location, Time & Engagement

- Candidates must be based in LATAM.

- US Central Time coverage and flexible overlap with the US team are required.

- This is a full-time contract engagement at 40 hours per week.

- The anticipated engagement runs through March 31, 2027.

- This is not currently a contract-to-hire opportunity.

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