Mactores5mo ago

Java Engineer – Application / Database Modernization

Marshall Islands·MumbaiRemoteFull time (Remote)mid

OtherJava Engineer

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javapostgresqlsqlagileci-cd

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.

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.

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.

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.