Ammiyappa S Mohan

[email protected] +919032317242 Sholinganallur, Chennai, TN, India

PROFESSIONAL SUMMARY

Results-driven Data Engineer with 4+ years of expertise in designing and optimizing scalable ETL pipelines and data models using Informatica Power Center, Talend, DBT Cloud, and DataStage. Proven track record in migrating over 20 legacy systems to cloud platforms, enhancing data quality by 30% and reducing processing times by 25%. Adept at leveraging SQL, Snowflake, Oracle, and Unix Autosys to deliver robust, scalable data solutions that improve production support and operational efficiency, empowering business intelligence and driving organizational growth.

WORK EXPERIENCE

Senior Software Engineer
01/2024 - Present
HCL Technologies Pvt Ltd , Sholinganallur, Chennai, TN, India
Transitioned legacy Informatica workflows to DBT models and batch pipeline.
Developed reusable DBT macros to streamline model creation.
Managed weekly and monthly production loads, maintaining data freshness and reliability.
Monitoring load status and generating comparative reports between the legacy system and Snowflake, while continuously updating stakeholders with status notifications until batch completion.
Analyze issues related to batch load failures and execute prompt solutions for successful load execution.
Implemented DBT tests and documentation for robust data governance.
Support the Client Reporting Production Environment as a first priority.
Implemented Automation Scheduling solutions, including Control-M, for optimized task management.
Conducted code reviews to maintain high-quality development standards.
Collaborated with cross-functional teams to ensure project alignment and integration.
Documented technical specifications for future reference and knowledge sharing.
Collaborated with team members to ensure successful project completion within timeline constraints.
Informatica Developer
08/2021 - 12/2023
Cognizant , Sholinganallur, Chennai, TN, India
Spearheaded design and development of mappings, mapplets, sessions, and workflows for efficient data loading from source to target database utilizing Informatica Power Center.
Transformed legacy data into Staging Area and populated target database through ETL process utilizing Informatica Power Center.
Participated in ETL process within development and production environments.
Address issues and remediation steps efficiently and promptly.
Conduct troubleshooting analysis and resolve critical application and batch process issues.
Collaborate with vendors to diagnose and rectify issues
Support the Client Reporting Production Environment as a first priority.
Utilize Automation Scheduling tool, such as Autosys, for efficient task management.
Utilized Informatica Data Quality to address customer address-related issues.
Utilized Informatica On Demand to primarily import data from Salesforce.
Sourced data from multiple channels, including Flat files and Oracle, and integrated it into target systems utilizing Informatica 9.6.1/10.2.
Proficiency in constructing snow pipe.
Proficiency in Snowflake virtual warehouse.
Managed Slowly Changing Dimensions to ensure comprehensive historical data maintenance.
Developed new mappings and revised existing mappings based on updates in Business Logic.
Compile status report and engage with Business and Technical leads during daily status call.
Developing documents related to designs and technical specifications.

EDUCATION

Master of Business Administration (MBA)
06/2018
Jawaharlal Nehru University

SKILLS

Technical Skills: Informatica Power center, ETL Process, ELT Process, Slowly changing dimensions (SCD), Model development and refactoring, Reusable Macros, Batch pipeline orchestration
Tools: Informatica Power Center, DBT Tool, Snowflake, DB2, SQL, Autosys, Control-M, Talend, DataStage

PROJECTS

Hartford
Technologies: Informatica Power Center, Snowflake, Talend Studio, Unix, Autosys - Scheduling Tool, SQL
The project focused on modernizing and streamlining enterprise data integration and reporting processes by leveraging Informatica PowerCenter and Snowflake. As part of the data engineering team, I led the design and development of ETL workflows to extract, transform, and load data from diverse sources—including legacy systems, flat files, and Oracle databases—into staging and target environments. The solution ensured high data quality, historical accuracy, and timely availability for client reporting.
Enterprise-USAA
Technologies: Informatica Power Center, Snowflake, DBT Tool, Unix, Control-M (Scheduling Tool), SQL, DataStage
This project focused on modernizing the enterprise data integration framework by transitioning legacy Informatica workflows to scalable DBT models and batch pipelines. The initiative aimed to enhance data reliability, governance, and operational efficiency within the Client Reporting Production Environment.