Nagateja Challa

Data Engineer at HMRC with a background in analytics and a Master's in computing and IT Management. Experienced in building Snowflake-based data pipelines with DBT, creating Power BI dashboards for senior stakeholders, and writing production-grade SQL and Python. Comfortable working across Development, Test, and Production environments and communicating technical outcomes to non-technical audiences.

Data Engineer - HMRC - Cardiff

(2025-01)

• Partnered with policy and operational teams to define data requirements, delivering tailored reporting that reduced manual analysis time and improved visibility into key tax and compliance metrics.
• Designed and built Power BI dashboards consolidating data from multiple Snowflake sources, enabling senior leadership to track KPIs and identify trends at a glance.
• Authored and optimised complex SQL queries across large-scale Snowflake datasets, improving query performance and supporting timely data delivery for downstream consumers.
• Implemented and maintained DBT transformation models to standardise raw data into clean, tested, analysis-ready tables used across the department.
• Automated repetitive data preparation tasks using Python (Pandas, NumPy), cutting manual effort and improving consistency of recurring reports.
• Managed end-to-end code deployments through Development, Test, and Production environments, conducting validation checks at each stage to ensure data integrity.
• Presented analytical findings and dashboard walkthroughs to non-technical stakeholders, bridging the gap between raw data and strategic decision-making.

Data Analyst Intern - CALNT Technology Private Limited - India (Remote)

(2022-07 - 2024-09)

• Queried and transformed datasets using SQL and Python to produce client-facing reports and internal analytics.
• Built interactive Power BI dashboards that gave stakeholders self-service access to key business metrics.
• Contributed to ETL pipeline development, integrating data from multiple sources into a unified reporting layer.
• Carried out data cleansing, deduplication, and validation to maintain high data quality standards.
• Responded to ad-hoc analytical requests from senior team members, delivering insights under tight deadlines.
• Worked with Azure cloud services and adopted Git-based version control for collaborative development.

MSc - Computing and IT Management - Cardiff University