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Devesh Singh

@deveshsingh1

Message

I build scalable cloud data pipelines and modernize enterprise lakehouses with PySpark and AWS.

India

Message

What I'm looking for

I'm looking to build and modernize reliable, large-scale cloud data platforms, lead high-impact data engineering initiatives, and solve SLA-critical processing challenges.

At Citibank, I lead enterprise data lakehouse modernization by migrating legacy Hive Parquet datasets to Apache Iceberg on Amazon S3 and building PySpark pipelines for Snowflake analytics. I also migrated 50K+ lines of SAS regulatory models to PySpark, cutting complex-model runtime from eight hours to one hour while exceeding SLA targets.

I've built Spark-based ingestion, standardization, validation, and automation frameworks across Risk and Finance reporting. My work spans Python, SQL, PySpark, Apache Spark, Hadoop, Snowflake, AWS, and data platforms designed for reliable large-scale processing.

Experience

Work history, roles, and key accomplishments

Current

Senior Data Science Analyst

Current

Citibank

Jan 2025 - Present (1 year 7 months)

Leading migration of legacy Hive datasets to Apache Iceberg on AWS S3 and building PySpark pipelines. Migrated 50K+ lines of SAS regulatory models to PySpark, reducing runtime from 8 hours to 1 hour.

PySpark Apache Spark Iceberg S3 Snowflake Hive Python SQL

Data Science Analyst

Citibank

Jul 2022 - Dec 2024 (2 years 5 months)

Developed macro library models and automation layers, reducing SLA timing by over 40%. Leveraged Snowflake and AWS S3 for cloud integration and implemented auto-Spark retry mechanisms.

PySpark Apache Spark Snowflake S3 Python SQL Automation

Technology Analyst

Citibank

Jul 2021 - Jul 2022 (1 year)

Built a transformation data framework from scratch for mortgage lines of business using PySpark, Scala, and Hadoop-Hive. Automated validations and data loading, saving 20% in runtime.

PySpark Scala Hadoop Hive Apache Spark Python Jenkins

Software Developer Intern

EnrichAi

May 2020 - Jul 2020 (2 months)

Developed IoT solutions using Cumulocity and Angular components for dynamic data handling. Designed and developed an enterprise-level website.

Cumulocity IoT AWS Lambda SES MERN Stack Angular

Full Stack MERN Developer Intern

Citrusberry Private Limited

Jun 2019 - Jul 2019 (1 month)

Assisted clients in digital transformation of B2B businesses through e-commerce services. Created a dynamic product cataloging system and a real-time automation chatbot.

MERN Stack JavaScript

Website & App Developer Intern

Muffito Incorporation

Jul 2018 - Sep 2018 (2 months)

Developed a web application for local pub and bar search based on user preferences. Improved the search system by implementing a filter by distance method.

Firebase Android SDK JavaScript

Education

Degrees, certifications, and relevant coursework

Delhi Technological University

Bachelor of Technology, Mathematics and Computing

2017 - 2021

Grade: 7.4 CGPA

Pursued a Bachelor of Technology in Mathematics and Computing, achieving a CGPA of 7.4. Coursework included data structures, algorithms, operating systems, and financial engineering.