Senior Data Engineer – Python Pipelines for Scale

Citigroup Inc.; Mississauga; On-site; CAD 167,000 - 236,000; Full time

Job summary

Citigroup Inc. in Mississauga seeks a Senior Data Engineer with strong Python expertise to design and scale data pipelines powering analytics and decision-making across the enterprise.

You will build PySpark workflows, optimize SQL and ETL processes, work with MongoDB, Databricks or Starburst, and collaborate with data scientists, analysts, and engineers to deliver reliable data solutions.

Qualifications

• 6+ years in software or data engineering.
• Hands-on Python data engineering, SQL, ETL design.
• Production-grade data pipelines at enterprise scale.
• Relational (PostgreSQL, Oracle, SQL Server) and NoSQL (MongoDB) experience.
• Regulated environments, preferably Financial Services.

Responsibilities

• Design, develop, and maintain scalable Python data pipelines for ingestion, transformation, and distribution across enterprise platforms.
• Build reusable Python libraries and automation utilities to support data engineering workflows.
• Develop and optimize complex SQL queries and DB objects across multiple relational databases.
• Design and implement ETL/ELT solutions including staging frameworks and error handling.
• Model data to support operational and analytical use cases.
• Work with MongoDB to design data structures for non-relational workloads.
• Build data pipelines using PySpark for large-scale distributed processing.
• Implement data quality controls to ensure accuracy and reliability.
• Collaborate with data scientists, analysts, engineers, and stakeholders to deliver data solutions.
• Contribute to CI/CD for automated testing, deployment, and version control of data workflows.
• Participate in code reviews and production support of data systems.
• Support data governance and security standards across data assets.

Skills

Python

SQL

PySpark

NoSQL MongoDB

Data Modeling

ETL/ELT Design

Education

Bachelor’s or Master’s in Computer Science / related field

Tools

Databricks

Starburst

Job description

Citigroup Inc. in Mississauga seeks a Senior Data Engineer with strong Python expertise to design and scale data pipelines powering analytics and decision-making across the enterprise.

You will build PySpark workflows, optimize SQL and ETL processes, work with MongoDB, Databricks or Starburst, and collaborate with data scientists, analysts, and engineers to deliver reliable data solutions.