Database Engineer

SIBSANKAR MITRA

Cloud & Infrastructure Engineering Leader Database Management Expert Cloud

Manager

Phone: 990-***-****

E-mail: *********.*****@*****.***

LinkedIn: https://www.linkedin.com/in/sibsankar-mitra-09ba5829/ Address: Bengaluru, India

Results-driven Lead Engineer with 15+ years of experience in database management, application support, and infrastructure operations across enterprise environments. Skilled in managing large-scale databases, ensuring high availability, and driving performance optimization. Proven expertise in leading cross-functional teams, implementing robust support systems, and aligning IT services with business objectives. Adept in database architecture, cloud infrastructure, and team leadership. Actively seeking a challenging role as a Database Manager/Technical Support Manager in Bangalore or other preferred locations, to contribute to organizational growth and operational excellence in a technology-driven environment. PROFESSIONAL SUMMARY

Technical Support & Delivery Leadership: Led daily operations and end-to-end delivery for a 20-member global technical support team, ensuring SLA adherence, case quality, predictable execution, and high customer satisfaction across enterprise platforms. People Leadership & Talent Development: Managed performance reviews, career development, mentoring, and succession planning; successfully transitioned 8 team members from admin roles into engineering roles through structured training and hands- on coaching.

Customer Escalations & Incident Management: Served as the primary escalation point for complex, high-severity issues, leading bridge calls, coordinating cross-functional teams, and driving incidents to successful customer closure with clear, timely communication.

Database Management & Optimization: Expert in handling large-scale databases with a focus on ensuring high availability,scalability, and performance across complex environments. High Availability & Best Practices: Designed and implemented Oracle RAC 19c with rolling upgrades, RU/PSU patching strategies (RAC,EXADATA,Non-RAC),performance tuning, and end-to-end physical standby DR drills. Application Support & Troubleshooting: Proven ability to maintain enterprise applications, ensuring smooth operations and resolving technical issues with minimal downtime.

Team Leadership & Collaboration: Skilled in leading cross-functional teams, promoting collaboration to achieve efficient project delivery and prompt issue resolution.

Platform Support & High Availability: Supported mission-critical, Java-based enterprise platforms and databases, ensuring high availability, stability, and performance across development, staging, and production environments with <1% downtime during major releases.

Process, Automation & Operational Excellence: Designed and automated support and platform operations, reducing manual effort by 90%, improving investigation consistency, and significantly lowering MTTR and repeat incidents. SLA, KPIs & Service Quality: Defined and tracked SLAs, KPIs, incident trends, and operational metrics, driving continuous improvement in CSAT, service reliability, and delivery predictability. Cloud & Platform Migrations: Led multi-phase platform and cloud migrations (including containerized and database migrations) with zero major incidents and full SLA compliance. Cost & Resource Optimization: Delivered $178K in cost savings through platform cleanup, resource optimization, and infrastructure right-sizing while maintaining service quality. Cross-Functional Collaboration: Partnered closely with Engineering, Product, and Customer-Facing teams to close tooling gaps, improve observability, strengthen documentation, and enhance customer readiness from development to production. ITIL & Best Practices: Enforced ITIL-aligned incident, problem, and change management processes to ensure operational stability, audit readiness, and consistent customer experience. SKILLS

Technical Skills: AWS Services, Google Cloud Platform (GCP), Oracle, Oracle RAC, PostgreSQL, Exadata, Teradata, Jenkins, GitHub, Docker, Maven, RMAN, Data Pump, pgAdmin, Shell Scripting, Python, Red Hat Linux, HP Unix, Tomcat, Teraform Core Competencies: Database Management & Optimization, Cloud Infrastructure & Automation, Application Support & Troubleshooting, System Integration & Configuration, Incident & Change Management, Performance Tuning & Monitoring, High Availability & Scalability, Cost Optimization, ITIL Best Practices, Service Level Agreements (SLAs), Backup & Recovery Automation, Incident,Problem,Change and escalation Managment, PostgreSQL Administration & Performance Tuning, GCP Cloud SQL (PostgreSQL) – Provisioning, HA, Read Replicas Soft Skills: Team Leadership, Collaboration, Problem-solving, Communication, Adaptability, Strategic Thinking WORK EXPERIENCE

Lead Cloud Application Administrator

Ellucian Higher Education Systems (I) PVT. LTD. Bengaluru, India (Bengaluru)

(Mar 2019 - Jan 2026)

Driving cloud infrastructure excellence, team leadership, and cost optimization through strategic migrations, automation, and scalable solutions.

Led day-to-day operations of the Oracle, Cloud, and Database Engineering teams, driving task prioritization, cross-team collaboration, and continuous mentoring to consistently meet very high availability targets and strict SLA commitments. Served as a deputy manager for cloud administrators and engineers, driving succession planning through structured career development, role-based skill progression, targeted training, and continuous mentoring, resulting in strong skill uplift and internal promotions.

Improved team performance, engagement, and retention by leading regular feedback cycles, coaching, and escalation support, contributing to reduced attrition and a high-performing engineering culture. Owned end-to-end Oracle infrastructure operations on AWS, managing EC2, ECS, EBS, ALB/ELB, Auto Scaling, IAM, Route 53, CloudWatch, and S3 supporting mission-critical database workloads. Led capacity planning, database growth forecasting, instance right-sizing, and storage optimization, delivering significant infrastructure cost savings while sustaining performance under peak workloads. Managed IAM access models and database security controls, enforcing least-privilege access, secure cross-account connectivity, and audit-compliant access patterns.

Strengthened disaster recovery readiness by validating Oracle backups, AWS snapshots, restore procedures, and Data Guard recovery workflows, resulting in faster and more reliable recovery outcomes during DR drills. Implemented Point-in-Time Recovery (PITR) and validated restore procedures during DR drills for Postgres . Implemented enterprise-grade monitoring and observability using CloudWatch and Datadog (Synthetic Tests), enabling proactive detection and a noticeable reduction in critical incidents. Spearheaded automation initiatives using Shell scripting, Ansible, Jenkins, Terraform, and Git, significantly reducing manual operational effort and improving mean time to resolution. Directed incident, problem, and change management, leading bridge calls, coordinating engineering and application teams, and driving critical incidents to closure with improved customer satisfaction. Led large-scale Oracle Database upgrades (12c, 18c, and 19c) across enterprise environments, including extensive Oracle 19c upgrades, achieving zero data loss and highly reliable upgrade outcomes. Executed Oracle 19c upgrades via DevOps pipelines, introducing standardized validation, rollback, and automation workflows to improve release reliability and deployment consistency. Designed and implemented Oracle RAC and Data Guard architectures, including new Data Guard setups, role switchovers, failovers, and DR drills across both RAC and non-RAC environments. Performed advanced database performance tuning and optimization, resolving blocking sessions, SQL bottlenecks, and resource contention issues, resulting in significant performance improvements. Tuned PostgreSQL workloads using EXPLAIN ANALYZE, pg_stat_statements, index optimization, and query rewrite strategies. Led quarterly PSU and RU patching for Oracle databases and middleware patching for WebLogic, ensuring security compliance and reducing post-patch stability issues.

Owned environment cloning and refresh operations, including database and application clones, snapshot-based restores, and AWS- based cloning strategies for rapid environment provisioning. Led Tomcat upgrades and containerization initiatives, including migration of applications to Docker on ECS clusters, improving deployment consistency, scalability, and operational resilience. Led a comprehensive migration of on-premises PostgreSQL databases (versions 14) to Google Cloud SQL for PostgreSQL, ensuring zero data loss and minimal downtime for enterprise workloads. Developed operational automation scripts for database availability checks, blocking session monitoring, mount point alerts, and proactive log scanning with notifications.

Analyzed recurring post-upgrade and post-migration issues, partnering with engineering teams to close tooling gaps and prevent recurrence through automation and standardization. Established proactive operational excellence practices, leading to a sustained reduction in customer-impacting incidents over time. Supported global enterprise customers across multiple regions, operating within a follow-the-sun support model and leading high- visibility escalations.

Engineer 2

JC Penny Services India PVT. LTD. Bengaluru, India

(Nov 2016 - Mar 2019)

Optimized cloud infrastructure and database performance through strategic upgrades, automation, and cross-functional collaboration to enhance service reliability and efficiency.

Architected and executed Oracle RAC platform upgrades, driving successful 11g to 12c RAC transitions with coordinated Clusterware and ASM upgrades, ensuring compliance with enterprise availability and resilience standards. Delivered zero-downtime Exadata patching by strictly following rolling patch methodology, validating ASM redundancy, and ensuring Smart Scan functionality post-maintenance. Drove proactive RAC performance engineering, continuously analyzing interconnect efficiency, cache fusion metrics, and ASM I/O patterns to improve cluster reliability, scalability, and operational efficiency. Managed and maintained complex Exadata cloud environments, integrating automated backup and recovery protocols to ensure continuous availability and data integrity.

Collaborated across cross-functional teams to align infrastructure capabilities with business and customer requirements, significantly improving service delivery and operational cohesion. Ensured compliance with non-functional requirements, such as reliability, scalability, and security, throughout all infrastructure development and system upgrade initiatives.

Devised and implemented automation strategies to streamline backup and recovery operations, resulting in reduced manual effort and increased system availability within the cloud ecosystem. Enhanced overall service efficiency by optimizing infrastructure management practices, directly contributing to improved operational performance and successful fulfillment of business goals. Tech Lead

Cognizant Technology Solutions, Bengaluru, India

(Mar 2010 - Nov 2016)

Led enterprise-grade Oracle infrastructure initiatives with a focus on scalability, high availability, and ITIL-driven compliance and service excellence.

Engineered and deployed core infrastructure solutions for large-scale Oracle databases, executing seamless upgrades from 10g to 12c with a focus on fault tolerance, high availability, and scalability. Enforced robust security and compliance measures by leveraging ITIL best practices, ensuring all infrastructure components maintained regulatory alignment and system integrity. Addressed critical non-functional requirements, such as resilience, scalability, and performance efficiency, during both infrastructure design and upgrade cycles.

Applied ITIL methodologies to streamline operational workflows, driving service efficiency, ensuring reliability, and maintaining compliance across all infrastructure platforms.

EDUCATION

CERTIFICATIONS

Oracle Database@AWS Architect Professional 2025

AWS Certified Solutions Architect Professional 2023 AWS Certified Solutions Architect Associate 2020

Oracle Certified Professional- 12c (Database Administration) 2016 ITIL v3 Foundation Certified 2013

Six Sigma Process (Cognizant Internal Certification) ACHIEVEMENTS

Honored with the Ellucian High Impact Reward (2024) for delivering exceptional contributions to cloud operations and demonstrating strong team leadership capabilities. Recognized as Best Performer (2017) by the global DBA team at JCPenney for outstanding execution in Exadata patching and successful management of a Teradata database upgrade. Awarded Best Performer (2012 & 2013) by the India Retail Team at Cognizant for consistent excellence in database administration and infrastructure performance optimization.

PROJECTS

Oracle 19c Upgrade & Pipeline Automation

Automated and executed Oracle 19c upgrade pipelines for 120+ clients, ensuring the upgraded infrastructure met high-performance standards and supported scalable growth.

EC2 to ECS Migration

Directed the end-to-end migration of applications from EC2 to ECS, achieving cost efficiency and enhancing infrastructure elasticity to align with dynamic customer requirements.

PostgreSQL Migration

Led seamless database transitions from Oracle to PostgreSQL for multiple enterprise clients, focusing on data integrity, minimal downtime, and smooth system cutover.

Performance Optimization

Drove performance tuning initiatives, including SQL query optimization and resource utilization improvements, resulting in notable gains in application speed and responsiveness.

LANGUAGES

English, Hindi, Bengali

PG PMP

(2022 - 2024)

University of Massachusetts, Amherst, USA

B Tech in IT

(2003 - 2007)

Orissa Engineering College, Bhubaneswar, India

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