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Backend Engineer – Java Modernization

Full Time
Experience: 5+ years
Remote
Skills:

Java, Java 17, Spring, Spring 5, Apache Spark, Scala, Hbase, REST APIs, Maven, Gradle

Remote3 PM onwards

About the role

We are looking for a Backend Engineer with strong hands-on experience in Java 17, Spring, application modernization, dependency upgrades, and production remediation.

The engineer will work on modernizing existing Java applications, including runtime and framework upgrades, dependency and CVE remediation, and compatibility with HBase/Spark-based data platforms. The role requires strong focus on maintaining application behavior and API compatibility while making modernization changes.

The ideal candidate should have experience with Java 8 to Java 17 modernization, dependency remediation, automated testing, integration validation, and production application migration.

Responsibilities

  • Modernize existing Java applications from legacy runtimes to Java 17.

  • Upgrade Spring/framework versions while maintaining application functionality and compatibility.

  • Analyze and remediate application dependencies and associated CVEs/security vulnerabilities.

  • Assess compatibility issues resulting from Java, Spring, library, runtime, and platform upgrades.

  • Work with HBase and Spark integrations and resolve compatibility issues between applications and data platforms.

  • Develop and maintain backend services and REST APIs as required during modernization.

  • Perform dependency upgrades using Maven and/or Gradle.

  • Implement code changes required to support runtime and framework modernization.

  • Use automated testing to validate application behavior following modernization changes.

  • Perform integration and compatibility testing across application, data, and infrastructure layers.

  • Support remediation of findings identified through security scanning and dependency analysis.

  • Work with DevSecOps and Security teams to resolve application security findings.

  • Participate in production migration, deployment, cutover, validation, and rollback activities.

  • Troubleshoot production compatibility and application issues during migration and stabilization.

  • Maintain technical documentation related to modernization, dependencies, compatibility, and remediation.

  • Collaborate with Cloud, Data, QA, Security, and DevSecOps teams to resolve cross-functional issues.

Must-Have Skills

  • 5+ years of hands-on Java backend development experience.

  • Strong experience with Java 17 and Java application modernization.

  • Strong experience with Spring / Spring 5.

  • Experience with Java 8 to Java 17 migration or equivalent runtime modernization.

  • Strong experience with Maven and/or Gradle.

  • Experience with REST APIs and backend service development.

  • Experience with dependency upgrades and CVE/security remediation.

  • Experience with application compatibility testing during runtime/framework upgrades.

  • Experience integrating Java applications with HBase and/or Spark.

  • Strong understanding of application dependencies and impact analysis.

  • Experience with JUnit and Mockito or equivalent unit-testing frameworks.

  • Experience supporting production application migration and validation.

  • Strong troubleshooting and debugging skills.