Summary
Overview
Work History
Education
Skills
Certification
ADDITIONAL INFORMATION
Timeline
Generic

Tison Thomas

Pimpama,Queensland

Summary

Senior Oracle and PostgreSQL Database Administrator with 12+ years of experience managing mission-critical enterprise database environments across Oracle, PostgreSQL, and AWS cloud platforms. Possesses strong proficiency in AWS (RDS, DMS, EC2, Aurora) database services. Expert in database administration, performance tuning, high availability (Data Guard), disaster recovery and production support for mission‑critical applications. Proven success delivering database migrations from on‑premise infrastructure to cloud platforms and supporting global enterprise systems across healthcare, logistics, telecom and insurance domains. Strong experience in database security, patching, monitoring, and automation with a focus on reliability, scalability, and performance.

Overview

12
12
years of professional experience
1
1
Certification

Work History

Principal Engineer - Database & Cloud

Ascendion
Bangalore, India
04.2025 - 01.2026

Environment: Oracle 19c, PostgreSQL, AWS RDS, EC2, Linux

  • Provided L3 database and cloud support for large-scale health care systems at Kenvue (Johnson & Johnson).
  • Key Member in Oracle to AWS RDS PostgreSQL migration initiatives, ensuring minimal downtime and seamless data transition.
  • Performed database patching, backup validation, and disaster recovery readiness testing for mission-critical systems.
  • Monitored database performance and optimized configurations using AWS monitoring tools and performance tuning techniques.
  • Maintainedined high availability production environments ensuring reliability and regulatory compliance.

Senior Data Engineer

Gadgeon Smart Systems Pvt Ltd
Kochi, Kerala, India
10.2022 - 03.2025

Environment: Oracle Autonomous Database, Oracle Cloud Infrastructure, PostgreSQL, Azure Container Apps

  • Key contributor to a large-scale cloud migration project moving DHL enterprise databases from on-premise infrastructure to the cloud.
  • Administered Oracle Autonomous Database environments ensuring availability, scalability, and performance.
  • Optimized database objects including functions, views, and external tables to support cloud migration compatibility
  • Collaborated closely with development teams to resolve performance bottlenecks and optimize SQL queries.
  • Supported ETL and data engineering workflows enabling reliable enterprise data pipelines.

Senior Database Administrator

IMMCO Software Solutions
Kochi, Kerala, India
10.2020 - 10.2022

Environment : PostgreSQL, AWS RDS, Amazon Aurora, Linux, AWS CloudWatch

  • Managed AWS RDS PostgreSQL and Amazon Aurora database environments for telecom and engineering clients including Jacobs Engineering and Fulton Hogan.
  • Configured database replication, backup automation, and monitoring using AWS CloudWatch.
  • Automated PostgreSQL backups using cron jobs reduce manual effort and improve recovery processes.
  • Configured and maintained standby databases for high availability and disaster recovery.
  • Proactively monitored disk space, tablespaces, and system health to prevent outages.
  • Developed and maintained database security protocols for user access.
  • Collaborated with development teams to support application integration.
  • Monitored database performance and optimized queries for efficiency.

Senior Database Administrator

Capita
Pune, Maharashtra, India
10.2016 - 10.2020

Environment: Oracle 12c/19c, Linux, RMAN, AWR, ASH

  • Administered enterprise Oracle database environments supporting high-volume client applications
  • Executed Oracle database upgrades from 12c to 19c, ensuring compatibility and minimal downtime.
  • Implemented RMAN backup and recovery strategies to safeguard critical enterprise data.
  • Mentored junior staff on best practices in database management.
  • Performed database performance tuning using AWR and ASH reports.
  • Performed quarterly patching and performance tuning to maintain optimal system performance.

Executive Database Administrator

Bajaj Allianz General Insurance Company Pvt Ltd
Pune, Maharashtra,India
04.2014 - 10.2016

Environment : Oracle RAC 10g/11g, WebLogic Server, Oracle Application Server

  • Supported Oracle RAC database environments for enterprise insurance systems.
  • Managed database creation, refreshes, and maintenance across development, testing, and UAT environments.
  • Assisted in application server migration from Oracle Application Server to WebLogic.
  • Weblogic server monitoring and administration.
  • Performed UAT and pre-production environment refreshes on database and weblogic application server, ensuring accurate testing environment.
  • Worked closely with development teams on performance and deployment issues, enhancing application reliability.

Education

Bachelor of Computer Applications -

Indira Gandhi National Open University
Pune, India
03.2014

Skills

    Database Technologies

    Oracle 10g, 11g, 12c, 19c , PostgreSQL , AWS RDS , Amazon Aurora

    High Availability & Disaster Recovery

    Oracle Data Guard , Standby Databases , Replication , Backup & Recovery , Streaming Replication , WAL Archiving , PITR , repmgr , Disaster Recovery Testing

    Performance & Monitoring

    AWR / ASH Analysis , SQL Performance Tuning , Index Optimization , Capacity Planning , pg_stat_statements , Database Health Metrics

    Cloud Platforms

    Amazon Web Services (AWS) – RDS, EC2, DMS, Aurora , Oracle Cloud Infrastructure , Microsoft Azure

    Database Administration

    Database Installation , Configuration , Upgrades , Patching , Performance Tuning , Capacity Planning ,Database Monitoring , Security Management , User & Role Administration , Database Migration

    Middleware

    Oracle WebLogic Server , Oracle Application Server

    Tools & Operating Systems

    Linux , Windows Server , DBeaver , pgAdmin , ClearCase , SQL Developer

Certification

AWS Certified Cloud Practitioner – Amazon Web Services

ITIL Foundation V3

Diploma in Systems Management – NIIT

Oracle 11g & 12c Administration Workshop – CMS IT Solutions

ADDITIONAL INFORMATION

  • Work rights - PR.
  • Availability - immediate.
  • Recently moved to Australia.
  • Willing to relocate to Anywhere in Australia.

Timeline

Principal Engineer - Database & Cloud

Ascendion
04.2025 - 01.2026

Senior Data Engineer

Gadgeon Smart Systems Pvt Ltd
10.2022 - 03.2025

Senior Database Administrator

IMMCO Software Solutions
10.2020 - 10.2022

Senior Database Administrator

Capita
10.2016 - 10.2020

Executive Database Administrator

Bajaj Allianz General Insurance Company Pvt Ltd
04.2014 - 10.2016

Bachelor of Computer Applications -

Indira Gandhi National Open University
Tison Thomas