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Open since May 2026

Java Engineer – Application / Database ModernizationMactores · Mumbai

Java Engineer – Application / Database Modernization

MumbaiRemoteFull-time

AI Summary

Analyzes and remediates large enterprise Java codebases to replace legacy Oracle SQL with PostgreSQL-compatible constructs, converting embedded SQL in Java services and MyBatis mappers while refactoring transaction logic and ORM layers.

About this role

Mactores is a trusted leader among businesses in providing modern data platform solutions. Since 2008, Mactores have been enabling businesses to accelerate their value through automation by providing End-to-End Data Solutions that are automated, agile, and secure. We collaborate with customers to strategize, navigate, and accelerate an ideal path forward with a digital transformation via assessments, migration, or modernization.

Mactores is looking for a Software Engineer with proficiency in Java, Spring, and Hibernate to participate in the migration project from Oracle to PostgreSQL. The ideal candidate should possess a robust understanding of Java, Spring, and Hibernate, with hands-on experience in developing large-scale Java web applications.

What you will do?

  • Analyze and remediate large enterprise Java codebases to replace legacy or database-specific SQL constructs with modern, standards-compliant SQL.
  • Convert embedded SQL within Java services and MyBatis XML mappers, including rewriting constructs such as vendor-specific functions, sequences, pagination logic, dynamic SQL, and error-handling patterns.
  • Collaborate closely with schema and database migration engineers to ensure application-layer SQL aligns with the modernized target schema.
  • Refactor Java transaction logic, error-handling, drivers, and ORM/DAO layers to support the behavior of modern databases.
  • Participate in unit, integration, and performance testing to confirm functional parity and ensure applications meet performance SLAs post-modernization.
  • Support application cutover activities for production environments, including validation, monitoring setup, rollback planning, and stabilization.
  • Produce engineering documentation: SQL remediation guides, code-migration runbooks, troubleshooting guides, and knowledge-transfer material for customer teams.
  • Work across distributed teams (US & India) and collaborate with customer SMEs to ensure business logic alignment and successful modernization outcomes.

    • What are we looking for?

  • Bachelor’s degree in Computer Science, Engineering, or related field.
  • 5+ years of professional Java development experience (Spring, JDBC, MyBatis/Hibernate or equivalent).
  • Experience with application modernization, database migrations, or large-scale refactoring initiatives.
  • Strong SQL expertise and the ability to analyze, interpret, optimize, and rewrite complex SQL used within Java applications.
  • Deep understanding of JDBC, ORMs, Java transaction patterns, and database-driven application flows.
  • Experience working on enterprise-grade, high-performance applications with complex data interactions.
  • Strong communication skills and ability to work with global distributed teams in US time-zones.

    • You will be preferred if

  • Experience with PostgreSQL, Aurora PostgreSQL, or modernization from legacy databases such as Oracle, SQL Server, or DB2.
  • Exposure to automated code-refactoring tools or GenAI-assisted remediation workflows.
  • Familiarity with CI/CD environments, performance testing tools, and observability stacks.
  • Consulting or professional services experience delivering fixed-timeline modernization projects.

    • Skills

    Automated Code RefactoringCI/CDHibernateJavaJDBCMyBatisOraclePerformance TestingPostgreSQLSpringSQL

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