Sreenadh Sreekumar
Bangalore
Summary
Staff-level Data Engineer with 14+ years of experience delivering scalable data platforms and identity solutions across retail and banking domains. Specialized in Spark, Hive, Python, and ETL frameworks like Talend and Datastage. Skilled in performance tuning, customer data profiling, and resilient data pipeline design. Adept at translating business needs into robust engineering solutions with a focus on quality, efficiency, and reusability.
Overview
15
15
years of professional experience
Work History
Staff Data Engineer
Walmart Global Technology Services
05.2019 - Current
- Built a Customer matching pipeline which served the business for targeting and personalized marketing purposes
- Developed advanced level analytics and fuzzy matching logic to measure KPI improvements and evaluate matched output accuracy across pipeline runs
- Worked on Ingesting huge volumes of data with complex transformations into Data Lake
- Extensively used Spark to build data pipelines and scheduled them using tools such as Airflow and Automic
- Reduced pipeline execution time by 40% via Spark optimizations and resolution of performance bottlenecks (skew joins, full table scans).
- Developed a Labelling framework which can be used to create a Golden Dataset for Customer matching model across various markets
- Mentored interns and external student teams (GCT), leading an analytical use case from data sourcing to final demo delivery.
- Experience in debugging slow running Spark jobs and optimizing them for improved performance
Lead Data Engineer
Walmart Global Technology Services
12.2017 - 05.2019
- Engineered large-scale customer data ingestion flows using Hive, Oozie, and Sqoop for behavioral analytics.
- Developed feature engineering logic and validation stages for future value prediction workflows.
- Supported customer insights generation (attrition, engagement, migration) to inform targeted campaigns.
- Extensively used 'SQOOP' to transfer data between Hadoop and Relational databases
- Gathered good domain knowledge on various Customer attributes and its functions
- Improved performance of hive query executions using optimization techniques
ETL Developer, Admin
Walmart Global Technology Services
04.2016 - 12.2017
- Worked on Integration of Data Quality efforts across different SMAs in Walmart
- Designed a clean-up algorithm for store brand related information which could perform steps like deduplication of brand names, nearest match filtering, proposal of possible suggestions for incorrect brand names etc.
- Gained immense hands on experience in Talend Studio (ETL) tool, TAC (Talend Administrator Console for scheduling) and its architecture
- Developed a Generic Wrapper Script that can invoke any Talend executables from Unix server thereby integrating Talend job with CA7 scheduler
- Strong expertise in understanding business requirements and transforming them into technical rules (SQLs) or ETL jobs (Talend/ Datastage)
- Created reusable component to automate the extraction of rule information (SQLs), Database details from Talend for quicker turnaround of ad-hoc business requests
- Developed sound knowledge base on Web services and protocols like SOAP, JSON etc.
- Worked on Talend support by proactively troubleshooting production issues. Implemented permanent fix to overcome recurring issues
Software Engineering Sr. Analyst: Datastage Enhancement & Support
Accenture Services Private Limited
10.2010 - 04.2016
- Used IBM Infosphere DataStage designer to develop jobs for extracting, cleansing, transforming, integrating, and loading data into data warehouse database.
- Designed and implemented server jobs including sequencers with proper job dependencies, triggers.
- Created automation tools to capture production statistics like Job timings, record counts and data quality checks etc. on daily and monthly basis.
- Developed UNIX scripts which handle general file formatting issues like extra delimiters/spaces/new line characters etc. resulting in reduction of 3-4 hours of manual effort per day.
- Predominantly led a Datastage upgrade project from offshore by migrating 3 different applications from DS 7.5 to DS 9.1.
- Experience in validating Production data and programming logics used.
- Extensively worked in debugging issues in production phase related to user defects meeting all SLAs.
- Experience in debugging ETL jobs for errors and warnings associated with them.
- Provided production support and performed enhancement on existing applications.
- Responsible for performing data validations/ reconciliations on production data.
Software Engineering Analyst: Datastage Design & Development
Accenture Services Private Limited
10.2010 - 07.2013
- Extensively Worked on various Database Stages, File Stages, Debug/Development Stages and Processing Stages like Join, Funnel, Merge, Transformer, Lookup, Filter, Sort, Sequential File, Dataset, Remove Duplicate Stages etc to develop Server, Parallel and multi-instances of Sequence jobs with different invocation ids and job parameters for different daily and month-end data loads.
- Designed & developed jobs using Datastage Designer to extract data from different resources, cleansing, applied various Business rules and logics to load data into DWH.
- Designed Datastage Jobs by implementing best practices, Environment Variables, and following Bank’s Naming Standards, Parameterize the variables from Global Environment to stage level.
- Designed and developed Datastage jobs to load Dimension and Fact Tables for different Data Marts based on the granularity of the data extracted from different sources.
- Extensively used different stages in Data Stage like Column Import, Transformer, Copy, Sort, Row Generator, and Remove Duplicates.
- Used Data Stage Manager to create and import table definitions and Data Stage Director to run the Datastage jobs.
- Prepared Test cases for Data Stage jobs and the validation rules which addressed the Business needs and technical requirements.
- Worked on scheduling the Data stage jobs in TWS.
Education
Bachelor of Science - Computer Science
Cochin University of Science And Technology
Ernakulam, Kerala01.2009
Skills
- Spark
- Scala
- Python
- Hive
- SQL
- Datastage/Talend
- Customer Identity
- Data Quality
- Data Profiling
- Agile/Scrum
- Airflow
- Pipeline Optimization
- Cross-functional Collaboration
Activities
- President of Sports Club at School Level.
- Joint Secretary of EL Juego 08, an all Kerala Football Tournament conducted by the College.
- Performed as a lead guitarist in many musical band events at Inter Corporate Level.
- Led the Academic mini & Main Project teams.
- Won several Proficiency prizes and earned Scholarships at School.
Additional Information
- Language proficiency: Malayalam (native), English (fluent), Hindi (proficient)
- Former lead guitarist in inter-corporate music bands
Timeline
Staff Data Engineer
Walmart Global Technology Services
05.2019 - Current
Lead Data Engineer
Walmart Global Technology Services
12.2017 - 05.2019
ETL Developer, Admin
Walmart Global Technology Services
04.2016 - 12.2017
Software Engineering Sr. Analyst: Datastage Enhancement & Support
Accenture Services Private Limited
10.2010 - 04.2016
Software Engineering Analyst: Datastage Design & Development
Accenture Services Private Limited
10.2010 - 07.2013
Bachelor of Science - Computer Science
Cochin University of Science And Technology
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