01
TRCD-26-04371
Senior Java / Hibernate Migration Engineer (Oracle to PostgreSQL)
Senior-level Java engineer needed for a night-shift contract role in India to own application-side changes for an Oracle to PostgreSQL database swap across an 8-module Java/Grails suite on Azure. Scope is intentionally narrow (no framework upgrades): update JDBC dependencies and Hibernate dialects, validate/fix Hibernate/JPA mappings for PostgreSQL, resolve LOB (BLOB/CLOB) handling differences, translate Oracle-specific SQL across 100+ DAOs and convert 51 maintenance scripts from PL/SQL to PL/pgSQL. Strong legacy-stack experience is required (Java 8, Hibernate 4.x, Spring 4.x XML) plus proven Oracle→PostgreSQL migration delivery.
Position summary
- Location
- India
- Workplace
- Remote
- Employment
- Contract
- Experience
- Minimum 7 years and Maximum 12 years
Role overview
Why This Role Matters.
Senior-level Java engineer needed for a night-shift contract role in India to own application-side changes for an Oracle to PostgreSQL database swap across an 8-module Java/Grails suite on Azure. Scope is intentionally narrow (no framework upgrades): update JDBC dependencies and Hibernate dialects, validate/fix Hibernate/JPA mappings for PostgreSQL, resolve LOB (BLOB/CLOB) handling differences, translate Oracle-specific SQL across 100+ DAOs and convert 51 maintenance scripts from PL/SQL to PL/pgSQL. Strong legacy-stack experience is required (Java 8, Hibernate 4.x, Spring 4.x XML) plus proven Oracle→PostgreSQL migration delivery.
Your Impact
Deliver Enterprise Value
Help organisations solve complex business problems through modern technology, consulting expertise and measurable outcomes.
Collaboration
Work Across Teams
Collaborate with consultants, architects, engineers and client stakeholders throughout the project lifecycle.
Growth
Learn Continuously
Gain exposure to enterprise technologies, certifications, mentoring and real-world project experience.
Career Path
Grow With Ubique
Build a long-term consulting career with opportunities to take on greater responsibility and leadership over time.
Responsibilities
What You'll Be Doing.
Every role at Ubique contributes directly to solving meaningful business challenges for our clients.
02
Senior Java / Hibernate Migration Engineer
03
7+ years Java, including production Java 8
04
5+ years Hibernate/JPA with hands-on Hibernate 4.x (legacy, not just modern Spring Boot)
05
At least one completed Oracle→PostgreSQL (or equivalent) migration on a Java app
06
Expert Oracle + PostgreSQL SQL — fluent translating NVL, SYSDATE, ROWNUM, DECODE, DUAL, MERGE, CONNECT BY, sequences
07
Spring 4.x XML configuration and BLOB/CLOB → bytea/text LOB handling
Technology stack
Tools & Technologies.
The platforms and technologies you'll use to build modern, enterprise-grade solutions.
01
Java 8
Required
02
Hibernate 4
Required
03
JPA
Required
04
Spring 4
Required
05
Spring XML
Required
06
Oracle
Required
07
PostgreSQL
Required
08
JDBC
Required
09
Hibernate dialect
Required
10
Grails 5
Required
11
GORM
Required
12
Groovy
Required
13
Gradle
Required
14
multi-module
Required
15
PL/SQL
Required
16
PL/pgSQL
Required
17
DAO
Required
18
SQL translation
Required
19
LOB
Required
20
BLOB
Required
Requirements
Skills & Experience.
We value curiosity, collaboration and continuous learning. If you don't meet every requirement but believe you can make an impact, we'd still love to hear from you.
Essential
Required Qualifications
Java (7+ years), including production Java 8
Hibernate/JPA (5+ years) with hands-on Hibernate 4.x (legacy)
Completed Oracle to PostgreSQL (or equivalent) migration on a Java application
Expert SQL in Oracle and PostgreSQL; ability to translate Oracle-specific constructs (NVL, SYSDATE, ROWNUM, DECODE, DUAL, MERGE, CONNECT BY, sequences)
Spring 4.x XML configuration
LOB handling: Oracle BLOB/CLOB to PostgreSQL bytea/text mapping and fixes
Gradle multi-module builds
PL/SQL to PL/pgSQL conversion
Preferred
Nice to Have
Grails 5.x
GORM
Groovy
Quartz
HikariCP
Flyway
Liquibase
Azure (hosting/deployment context)
What you'll gain
More Than Just A Job.
We're committed to helping every team member grow professionally, personally and technically while working on meaningful projects.
Global Exposure
Collaborate with international clients and multicultural teams on enterprise programmes.
Continuous Learning
Expand your expertise through mentoring, certifications and hands-on project experience.
Career Growth
Take ownership, develop leadership skills and grow your consulting career over time.
Flexible Working
Hybrid and remote collaboration designed around trust and delivering exceptional outcomes.
People First
Join a supportive culture where collaboration, respect and long-term relationships come first.
Enterprise Projects
Work on meaningful technology initiatives for leading organisations across industries.
Apply
Apply for Senior Java / Hibernate Migration Engineer (Oracle to PostgreSQL)
One page, about two minutes. We only ask for what we actually need to have a first conversation.