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I am a Senior Database Administrator & Database Architect with 10+ years of hands-on experience in RDBMS and Graph Databases, specializing in large-scale database migration, cloud modernization, and performance optimization for mission-critical systems. I have successfully delivered end-to-end database migrations and modernization programs across FinTech, Logistics, Healthcare, and Enterprise platforms, supporting clients in Singapore, UK, UAE, and South America. My work focuses on building highly available, scalable, and performance-optimized database environments on AWS and Azure. What I Do Best • End-to-end database migration and modernization with zero or minimal downtime • Performance tuning and query optimization for large, high-volume databases • Cloud-native database architecture and HA/DR implementation • Graph database modeling and optimization using AWS Neptune • Automation-driven DBA operations to reduce risk and manual effort Key Services I Offer Database Migration & Modernization • SQL Server → PostgreSQL / MySQL / Aurora • Oracle → PostgreSQL • SQL Server → AWS Neptune (Graph Database) • IBM DB2 → Aurora PostgreSQL • On-premises → AWS / Azure cloud migrations • Checksum-validated, low-downtime migration strategies Database Performance Optimization • Query rewrite and execution plan optimization • Index strategy design and tuning • Bottleneck identification for large datasets • Achieved 5x–20x performance improvements on critical workloads Cloud Database Engineering (AWS & Azure) • Amazon RDS, Aurora, EC2-hosted databases • AWS DMS migration pipelines • High Availability, Multi-AZ, failover & DR design • Monitoring and optimization using CloudWatch and Performance Insights Graph Database Engineering • AWS Neptune setup, tuning, and scaling • Gremlin and Cypher query optimization • Graph data modeling for complex relationships • SQL-to-Graph data transformation and integration Scripting & Automation • Python automation for ETL, migration, validation, and reporting • PowerShell and Bash scripting for DBA operations • Environment refresh automation for Dev / QA / UAT / Prod Reporting & ETL • SSIS, SSRS, Azure Data Tools (ADT) • Data warehouse design and transformation pipelines Technical Expertise • Databases: SQL Server, MySQL, PostgreSQL, Oracle, MongoDB, AWS Neptune, IBM DB2 • Query Languages: T-SQL, PgSQL, PL/SQL, Gremlin, Cypher • Cloud: AWS (RDS, Aurora, EC2, DMS, Redshift, VPC, KMS), Azure (IaaS / PaaS) • Scripting: Python, PowerShell, Bash • Tools: SSIS, SSRS, CloudWatch, SQL Profiler, Query Store, Performance Monitor Why Clients Choose Me • Proven experience with complex, high-risk migrations • Strong focus on data integrity, performance, and reliability • Clear communication and ownership from planning to delivery • Solutions built for long-term stability and scalability If you need a reliable DBA, migration specialist, or performance expert who can take full ownership and deliver results with precision, I’m ready to help.

I have 17+ years of IT experience in the area Application Development, Systems Integration, Production Support, Application Maintenance and QA projects. I have played the role of Project Manager, Project Lead, Business Analyst, Developer and QA. I have managed complete SDLC for medium sized development projects. I have business domain knowledge in the area of Automotive on-board telematics and IT systems, Pharma Relationship Marketing, Manufacturing Execution Systems and Work and Asset Management. I have actively implemented LEAN practices in Production support projects. My technical skills in Database consultancy/administration/development are as follows 1. Design and development of relational and NoSQL databases (Mysql, Oracle, MongoDB). Production support of Mysql and MongoDB databases. 2. Migrating existing databases to Mysql, Oracle and MongoDB. 3. Configuring monitoring and alerts for database servers. 4. Develop business layer applications in PL/SQL / Mysql procedures and UNIX. 5. Setup and support Mysql HA database cluster in single primary or multi primary mode without changes to your data or tables. 6. Setup and support Mysql master-slave replication for backups and failover. 7. Automated Point-in-time recovery of Mysql databases. 8. Performance tune databases like Mysql and Oracle. My programming language skills include 1. PHP 2. C 3. PL/SQL 4. Mysql stored procedures 5. UNIX Shell scripting My technical skills in REST API/Web Services consultancy/development are as follows 1. Creating high performance, scabale, standards compliant and secure RESTful API for backend and business logic processing as microservices or in monolithic service architecture. My technical skills in System/Devops consultancy/administration are as follows 1. Create solution architecture for Cloud and On-Premise infrastructure based on free and open source software stack. 2. Containerize Mysql and other servers using Docker and/or LXC. 3. Deploying LXC containers to create extremely lightweight and tightly packed virtualized environments to isolate, secure and streamline your IT operations. Running LXC containers have near zero performance penalty. 4. Install and configure QEMU-KVM virtual machines with full inter VM and external networking support, 3D graphics acceleration for GUI based administration. 5. Performance tune and secure your LAMP/LEMP and other application stack. 6. Deploying directory servers like OpenLDAP, designing DIT, configuring LDAP access control, indexing, replication and single sign-on. 7. Setup in-memory databases like Memcached or a persistent in-memory database Mysql Memcached plugin for caching or sessions. 8. Setup and maintain secure Email servers using Postfix, Dovecot, Courier IMAP, maildrop, Spamassasin, ClamAV, milters, DKIM, SPF, DMARC and Roundcube webmail. 9. Maintenance and administration of Linux servers like setting up firewall, webservers, mail servers, ldap servers, imap servers, automating system admin tasks using shell scripts, applying security updates, install and uninstall of software packages. 10. Setup of Jenkins for CI/CD of complex project workflows. 11. VPN setup ( IKE/IPSec and OpenVPN )

Hello, I consider myself an expert in Oracle Database world and Open for new opportunities! I'm passionate about solution in Oracle Database design + APEX+ OCI + ORDS + OAC Expert Developer. Working with more than 13+ years' experience in Oracle technology stack. With proven experience of expert in database and OCI practice. ⭐| Technical Area Expertise: -------------------------------------------- ✔️Expert Oracle SQL/PLSQL Developer ✔️Expert Oracle APEX Developer ✔️Oracle Cloud Infrastructure (OCI) ✔️Oracle ORDS services REST develop ✔️Oracle VBCS and Form & Report ✔️Oracle OAC OBIEE Publisher Reports ✔️Oracle WebLogic support and Maintains ✔️AI&ML services projects ✔Data Integration ETL tools ⭐| Database- Technical Expertise: • Strong knowledge of Oracle Database versions 23ai/19c/12c/11g • Hands on Data Modelling and Database Design • Expert knowledge of Performance Optimizations Query Tuning • Expert of advance SQL quires & PL/SQL Programming • Hands on collections and records advance level exception handling • Database DBA Administration for standalone and OCI hosted database • Database connection issue with other languages TNS troubleshooting • Debugging of issue and SQL developer data import and export • Oracle WALLET manager , ACL and Network security issues • Oracle Certificate installations for API outbound call from DB • Send SMTP and HTTP send mail from database • Oracle REST Data Services (Configurations, REST APIs development) • Webservices Types REST, SOAP XML & JSON Data Processing • Data integrations and ETL tools (data extractions transform) ⭐| APEX - Technical Expertise: • Oracle Apex 24.1, 23, 22.x,20.x,19.x,18.x,5.x • SQL& PL/SQL Programming expert (Advanced Level) • Expert in writing Oracle Function, Procedure, Package ,Triggers, cursors and sequences. • Oracle Forms and reports to APEX modernization • Implemented projects on Oracle cloud AI Services (Generative AI, Language, Vision, Document, speech) with APEX projects • Oracle REST Data Services (ORDS) APIs development and ORDS Configurations • Integrations with APEX- Oracle Services, Microsoft, Google, Amazon, Digital Ocean, Login.com, Tableau, PayPal. • Webservices Types REST, SOAP XML & JSON Data Processing in APEX. • Automations With APEX services like Files processing, mails notification, Reports and Custom JOBS. ⭐| OCI - Technical Expertise • Setting up and managing OCI networking (VCN, subnets, gateways, VPNs, etc.) • Configuring OCI Web Application Firewall (WAF) to protect applications • Email Delivery setup with (DKIM setting) • Data-integrations, data-loading, OAC report setups • WebLogic, NGINX, and load balancer setups OCI • Supporting migration of workloads (VMs, databases) to OCI • Configure DNS and manage domain mapping to the new OCI resources. • Managing Identity and Access Management (IAM): domains, policies, dynamic groups, compartments • Setting up IAM policies, compartments, and security controls (Cloud Guard, Vault) • Working with Linux-based environments (Oracle Linux, RHEL) for system configuration, performance tuning, and troubleshooting • Monitoring, performance tuning, and cost optimization • Installation of Oracle database, APEX, OBI, ORDS, WebLogic infra. ⭐| OAC/OBIEE - Technical Expertise • OAC report dashboard design • Working on BIP report development • BIP report bursting and exporting • Email delivery of monthly reports using Bursting • Crystal AOP, Jasper, PLPDF, Tableau Reports. I have been working with clients across the globe. 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞 I guarantee to solve your technical problems 100% in timely manner! Thanks for reading my profile and I am confident that we can make your project successfully together.

Oracle : - Having rich experience in Oracle Database Installation, upgrades. - install and setup high availability e.g. RAC , DG , GG - Rich experience in migration from one platform to another .\ - Rich experience in migration from on-prem to AWS/Oracle cloud . - Experience in AWS DMS - Setup the backup and recovery standards. - DB and query tunning. - troubleshoot performance issues - Automation using shell/batch/python scripting - debugging users issues . - Automate repetitive task using python/shell/batch script. - Having fair hands on automation using Ansible for Oracle DBA repetitive task. Migration: =========== - Oracle EE/SE to postgres AWS RDS using AWS SCT & DMS services - Oracle EE/SE to Oracle Cloud using datapump. - Oracle EE/SE to MariaDB using Goldengate. - Migration from one platform to another platform - Migration from oracle to databriks Automation: good in shell scripting , batch , python and ansible. recently completed oracle grid and rdbms installation automation using Ansible . Good experience in upgrades and performance tunning. Experience DBA devops and automation expertise. Postgres : ======= - Installation, upgrade minor and major - AWS Auroa RDA - postgres - troubleshooting - performance analysis Replication: Using golden gate Shareplex Debezium log miner and Openlogreplicator

Databricks & Power BI , Oracle DBA & EBS , SQL Server, PostgreSQL , Cloud & DevOps 10+ Years. Available on 12 hours' notice and ready to interview immediately. I build the full path from source systems to the dashboards and models your business runs on. Over the past decade I've delivered lakehouse platforms, BI reporting, and the enterprise database estates underneath them — for clients where accuracy and audit-readiness are non-negotiable. Databricks & Data Engineering : Certified Databricks Consulting Partner experience. Lakehouse architecture, Delta Lake, PySpark and SQL pipelines, medallion layering, Unity Catalog governance, and real-time streaming. Legacy migrations off Oracle, Sybase and on-prem warehouses into Databricks on AWS, Azure and GCP — including a recent 70+ table migration that halved infrastructure cost. Power BI, DAX & Business Intelligence: Semantic models, star schemas, and DAX that stays fast as volumes grow. Row-level security, incremental refresh, calculation groups, time intelligence, and tuning on models others have written off. Reporting migrations from SSRS, Oracle Reports and IBM Cognos to modern BI, plus data warehouse design and self-service rollouts. Data Quality, Governance & Compliance: Data quality frameworks, lineage, validation and reconciliation built for audit. Delivered an RBI-compliant enterprise data governance framework that cleared regulatory review with zero findings. AI & Machine Learning: ML model development and deployment, predictive analytics, NLP and LLM applications, computer vision, and intelligent automation. Python, PyTorch, TensorFlow, and MLOps pipelines that reach production rather than staying in a notebook. Oracle Database, EBS & Cloud -My deepest engineering area, covering administration, development and applications: Database Administration: Oracle 11g through 23ai. Installation, patching, upgrades and cross-platform migrations. RAC, Data Guard, ASM, Grid Infrastructure, GoldenGate replication. Performance tuning with AWR, ADDM, ASH and SQL Trace. RMAN backup and recovery, Flashback, and full DR architecture. Multitenant (CDB/PDB) administration, TDE, Database Vault, Audit Vault and security hardening. Development: PL/SQL packages, procedures, triggers and materialised views. Partitioning strategy, index design, query optimisation, and financial data processing and automation pipelines. Large-scale data extraction and web scraping solutions in PL/SQL. E-Business Suite: R12 and 12.2 administration, cloning, patching and upgrades. Modules across Financials (GL, AP, AR, FA, CM), SCM (INV, PO, OM) and HRMS. Concurrent manager tuning, Workflow, AOL, Forms and Reports, XML/BI Publisher, and OAF customisation. EBS-to-cloud lift-and-shift and third-party integration. Oracle Cloud: OCI infrastructure, Autonomous Database, Exadata Cloud Service, Fusion Cloud ERP integrations, and on-prem-to-OCI migration. Other Databases MS SQL Server (T-SQL, SSIS, Always On), PostgreSQL, MongoDB, Sybase and MS Access. Migrations, tuning, HA and DR across all of them. Cloud, DevOps & Infrastructure- AWS Partner and Google Cloud Partner experience, plus Azure and OCI. Cloud migration and landing zones, CI/CD pipelines, infrastructure automation, containerisation, monitoring, and 24/7 production support. VMware ESXi, Hyper-V and Citrix virtualisation, with DR via Veeam, NetBackup, SRM and Data Guard. How I work I ask questions before I write code, quote realistic timelines rather than optimistic ones, and document the handover so your team isn't dependent on me indefinitely. Most clients come back for a second engagement. Availability: I can start on 12 hours' notice and I'm available to interview immediately. Comfortable across US, UK, EU and APAC time zones. Message me with what you're trying to solve and I'll tell you straight whether I'm the right fit. Cheers!!!

Hello, Myself, Debasis from Kolkata, have 9 years of experience in Oracle APEX (ver 4.2 - 24.2) mainly, have experience in SQL, PL/SQL, Frontend part (JavaScript, jQuery, CSS, HTML). I have worked on a few 3rd party API Integrations with Oracle APEX applications and worked on AOP, BI Publisher also. I have some knowledge in Oracle Fusion Cloud API Integration in Oracle APEX. Thanks, Debasis Kundu