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Sr. Etl/informatica Developer Resume

Professional Summary

  • Over Seven (7) years of IT experience with extensive Data Warehousing implementations across various industries.
  • Over Seven (7) years of ETL and data integration experience in developing ETL mappings and scripts using Informatica PowerCenter 8.x/7.x/6.x and PowerMart 8.x/7.x.
  • Experience in all the phases of Data warehouse life cycle involving Requirement Analysis, Design, Coding, Testing, and Deployment.
  • Experience in working with business analysts to identify study and understand requirements and translated them into ETL code in Requirement Analysis phase.
  • Experience in creating High Level Design and Detailed Design in the Design phase.
  • Expertise in Business Model development with Dimensions, Hierarchies, Measures, Partitioning, Aggregation Rules, Time Series, Cache Management.
  • Extensively worked on the ETL mappings, analysis and documentation of OLAP reports requirements. Solid understanding of OLAP concepts and challenges, especially with large data sets.
  • Well versed in OLTP Data Modeling, Data warehousing concepts.
  • Strong knowledge of Entity-Relationship concept, Facts and dimensions tables, slowly changing dimensions and Dimensional Modeling (Star Schema and Snow Flake Schema).
  • Experience in integration of various data sources like Oracle, DB2, Sybase, SQL server and MS access and non-relational sources like flat files into staging area.
  • Experience in creating Reusable Transformations (Joiner, Sorter, Aggregator, Expression, Lookup, Router, Filter, Update Strategy, Sequence Generator, Normalizer and Rank) and Mappings using Informatica Designer and processing tasks using Workflow Manager to move data from multiple sources into targets.
  • Experience in creating Reusable Tasks (Sessions, Command, Email) and Non-Reusable Tasks (Decision, Event Wait, Event Raise, Timer, Assignment, Worklet, Control).
  • Tuned mappings using Power Center-Designer and used different logic to provide maximum efficiency and performance.
  • Experienced in UNIX work environment, file transfers, job scheduling and error handling.
  • Extensively worked on developing and debugging Informatica mappings, mapplets, sessions and workflows.
  • Loading data from various data sources and legacy systems into Teradata production and development warehouse using BTEQ, FASTEXPORT, MULTI LOAD, FASTLOAD and Informatica.
  • Worked on Performance Tuning, identifying and resolving performance bottlenecks in various levels like sources, targets, mappings and sessions.
  • Experience in writing, testing and implementation of the PL/SQL triggers, stored procedures, functions, packages.
  • Involved in Unit testing, System testing to check whether the data loads into target are accurate.
  • Experience in support and knowledge transfer to the production team.
  • Proficient in interaction with the business users by conducting meetings with the clients in Requirements Analysis phase.
  • Extensive functional and technical exposure. Experience working on high-visibility projects
  • Assign work and provide technical oversight to onshore and offshore developers
  • Excellent analytical/ communication skills and good team player.

Technical Skills

Databases: Oracle 7.x/8.x/9x/10g/11g, SQL Server 2008/2005/2003/2000, DB2 UDB 7.2, My SQL 5.0/4.1, MS-Access. Editors ( SQL Navigator, Toad),Netezza,Teradata
Oracle Tools: Oracle Enterprise Manager, Quest TOAD, SQL*PLUS, SQL*Loader, SQL*Net, SQL Navigator Export/Import, Oracle Discoverer 10g
ETL Tools: Informatica 8.x/7.x/6.x, Informatica PowerExchange 8.x/7.x
Data Modeling: ERWIN , Visio
Reporting Tools: MS SQL Server Reporting services 2005, Business Objects XI, Crystal Reports 10, Crystal Reports 2008, Oracle Reports 2.5.
Programming Skills: C++, Shell Scripting (K-Shell, C-Shell), PL/SQL, PERL, FORTRAN, JAVA (Eclipse IDE and Net Beans IDE), HTML, JAVA Script, J2EE, CSS.
Operating Systems: UNIX, HP, Sun Solaris 2.x/7/8, Windows ME/2000/2003/NT/XP, IBM AIX, Exceed (Editor)

Professional Experience:

Confidential
Sr. ETL Developer Dec 11- Till Date

Responsibilities:

  • Interacted with the Business users to identify the process metrics and various key dimensions and measures. Involved in the complete life cycle of the project.
  • Developed FRD (Functional requirement Document) and data architecture document and communicated with the concerned stakeholders. Conducted Impact and feasibility analysis.
  • Extensively used Teradata Utilities like Fast-Load, MultiLoad, BTEQ & Fast-Export.
  • Created Teradata External loader connections such as MLoad, Upsert and Update, Fastload while loading data into the target tables in Teradata Database.
  • Created salesforce External loader application and used this application to connect to salesforce.com.
  • Created Mapplets, reusable transformations and used them in different mappings.
  • Created Workflows and used various tasks like Email, Event-wait and Event-raise, Timer, Scheduler, Control, Decision, Session in the workflow manager.
  • Made use of Post-Session success and Post-Session failure commands in the Session task to execute scripts needed for clean up and update purposes.
  • Implemented parallelism in loads by partitioning workflows using Pipeline, Round-Robin, Hash, Key Range and Pass-through partitions.
  • Validation of Informatica mappings for source compatibility due to version changes at the source.
  • Trouble shooting of long running sessions and fixing the issues.
  • Implemented daily and weekly audit process for the Claims subject area to ensure Data warehouse is matching with the source systems for critical reporting metrics.
  • Developed shell scripts for Daily and weekly Loads and scheduled using Unix Maestro utility.
  • Involved in writing SQL scripts, stored procedures and functions and debugging them.
  • Prepared ETL mapping Documents for every mapping and Data Migration document for smooth transfer of project from development to testing environment and then to production environment.
  • Involved in Unit testing, System testing to check whether the data loads into target are accurate, which was extracted from different source systems according to the user requirements.
  • Worked with reporting team to help understand them the user requirements on the reports and the measures on them. Helped them in creating canned reports.
  • Migrated repository objects, services and scripts from development environment to production environment. Extensive experience in troubleshooting and solving migration issues and production issues.
  • Actively involved in production support. Implemented fixes/solutions to issues/tickets raised by user community.

Environment:Informatica PowerCenter 8.6.1/9.0.1,PowerExchange 8.1, Teradata, oracle 11g ,salesforce, XML, XSD, IBM MQ Series, Unix,Unix Shell Script, Erwin, Micro strategy.

Confidential
Sr. Informatica DeveloperOct09- Nov 11

Responsibilities:

  • Resolving issues related to Enterprise data warehouse (EDW), Stored procedures in OLTP system and analyzed, design and develop ETL strategies.
  • Developed mappings, sessions and workflows in Informatica Power Center.
  • Identified performance issues in existing sources, targets and mappings by analyzing the data flow, evaluating transformations and tuned accordingly for better performance.
  • Worked with heterogeneous source to Extracted data fromOracle database, XMLand flat files and loaded to a relational Oracle warehouse.
  • Developed standard and reusable mappings and mapplets using various transformations like Expression, Aggregator, Joiner, Router, Lookup (Connected and Unconnected) and Filter.
  • Migrated day one data for existing members in PCMH program from EDW into OLTP system using ETL process.
  • Performed tuning of SQL queries and Stored Procedure for speedy extraction of data to resolve and troubleshoot issues in OLTP environment.
  • Troubleshooting of long running sessions and fixing the issues related to it.
  • Worked withVariables and Parametersin the mappings to pass the values between sessions.
  • Involved in the development of PL/SQL stored procedures, functions and packages to process business data in OLTP system.
  • Carried out changes into Architecture and Design of Oracle Schemas for both OLAP and OLTP systems.
  • Worked with Services and Portal teams on various occasion for data issues in OLTP system.
  • Worked with the testing team to resolve bugs related to day one ETL mappings before production.
  • Creating the weekly project status reports, tracking the progress of tasks according to schedule and reporting any risks and contingency plan to management and business users.
  • Involved in meetings with production team for issues related to Deployment, maintenance, future enhancements, backup and crisis management of DW.
  • Worked with production team to resolve data issues in Production database of OLAP and OLTP systems.

Environment: Informatica PowerCenter 8.6.1, oracle 11g/10g/9i/8i, PL/SQL, SQL Developer 3.0.1, Toad 11.

Confidential, Columbus OH
ETL Developer Apr 08– Sep 09

Responsibilities:

  • Implemented CDC by tracking the changes in critical fields required by the user.
  • Developed standard and reusable mappings and mapplets using various transformations like Expression, Aggregator, Joiner, Router, Lookup (Connected and Unconnected) and Filter.
  • Extensive use of Persistent cache to reduce session processing time.
  • Identified performance issues in existing sources, targets and mappings by analyzing the data flow, evaluating transformations and tuned accordingly for better performance.
  • Modified the shell/Perl scripts as per the business requirements.
  • Maintained warehouse metadata, naming standards and warehouse standards for future application development.
  • Used Workflow Manager for creating, validating, testing and running the sequential and concurrent sessions.
  • Developed shell scripts for Daily and weekly Loads and scheduled using Unix Maestro utility.
  • Developed shell scripts for file transferring
  • Extensively used Netezza Utilities to load and execute sql scripts using Unix.
  • Implemented screen door process for cleaning flat files as per the business requirements.
  • Preparing ETL mapping Documents for every mapping and Data Migration document for smooth transfer of project from development to testing environment and then to production environment.
  • Refreshed the data by using fastexport and fastload utilities.
  • Involved in Unit testing, Iterative testing to check whether the data loads into target are accurate, which was extracted from different source systems according to the user requirements.
  • Preparing and using test data/cases to verify accuracy and completeness of ETL process.
  • Actively involved in the production support and also transferred knowledge to the other team members.
  • Co-ordinate between different teams across circle and organization to resolve release related issues.

Environment: Informatica PowerCenter 8.6.1, Netezza, Informix, SQL Server 2005, Erwin 4.1, Windows XP, UNIX, UNIX Shell Script.

Confidential, NY
Informatica Developer Jan 07–Mar 08

Responsibilities:

  • Analyzed business process and gathered core business requirements. Interacted with business analysts and end users.
  • Prepared a handbook of standards for Informatica code development.
  • Analyzed business requirements and worked closely with the various application teams and business teams to develop ETL procedures that are consistent across all application and systems.
  • Developed Custom metadata repository.
  • Used Informatica designer for designing mappings and mapplets to extract data from SQL Server, Sybase and Oracle sources.
  • Created different parameter files and changed Session parameters, mapping parameters, and variables at run time.
  • Extensively used Source Qualifier Transformation to filter data at Source level rather than at Transformation level. Created different transformations such as Source Qualifier, Joiner, Expression, Aggregator, Rank, Lookups, Filters, Stored Procedures, Update Strategy and Sequence Generator.
  • Used Debugger to test the data flow and fix the mappings.
  • Created and monitored workflows and task using Informatica PowerCenter Workflow Manager.
  • Partitioned Sessions for concurrent loading of data into the target tables.
  • Tuned the workflows and mappings.
  • Involved in identifying the bottle necks and tuning to improve the Performance.
  • Created workflows using Workflow manager for different tasks like sending email notifications, timer that triggers when an event occurs, and sessions to run a mapping.
  • Executed Workflows and Sessions using Workflow Monitor.
  • Dealt with data issues in the staging flat files and after it was cleaned up it is sent to the targets.
  • Actively coordinated with testing team in the testing phase and helped the team to understand the dependency chain of the whole project.
  • Executed the workflow using pmcmd command in UNIX.

Environment: Informatica PowerCenter 8.1.1/7.1.3, Oracle 10g/9i/8i, SQL Server 2000, PL/SQL, Erwin, TOAD, SQL*Plus, SQL*Loader, UDB, Sybase, XML, Windows, Linux and HP-UNIX.

Confidential, India
Informatica Developer Apr 05 - Dec 06

Responsibilities:

  • Interacted with business analysts and translate business requirements into technical specifications.
  • Designed and developed end-to-end ETL process from various source systems to Staging area, from staging to Data Marts.
  • Extensively worked on Informatica to extract data from Flat files, Excel files, and MS Access database to load the data into the target database.
  • Implemented the Incremental loading of Dimension and Fact tables.
  • Created Stored Procedures for data transformation purpose.
  • Created Tasks, Workflows, Sessions to move the data at specific intervals on demand using Workflow Manager.
  • Developed the control files to load various sales data into the system via SQL*Loader.
  • Developed Unix Shell scripts for maintaining Files.
  • Designed and created an Autosys job plan to schedule our processes.
  • Created PL/SQL Stored procedures and implemented them through the Stored Procedure transformation.
  • Develop, test and implement break/fix change tickets for maintenance.
  • Involved in writing test cases, assisting Testing team in testing.
  • Developed the document of the complete ETL process.

Environment: Informatica 7.1.1, UNIX, TOAD, IBM DB2 8.1, Oracle 8i (SQL/PLSQL), MS Access 2006, Win 2000, Autosys, MS Excel 2006, UNIX, UNIX Shell Script.

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