Senior Backend Python Developer

Overview

Join a Successful and Growing Data Company

Cleanlist is Canada’s leading customer data company — and we’re on a mission to rid the world of bad customer data. We help hundreds of organizations clean, enrich, and acquire the data they need to drive marketing ROI, operational efficiency, and business growth. Our clients include some of the country’s most recognized brands — Costco, Loblaw, Rogers — and many others who trust us to power their customer data strategies.

Now, we’re scaling to the next level. To get there, we need a Senior Backend Python Developer who can help Cleanlist stay on the leading edge with great products and infrastructure.

This is not a “ticket-taking” role. You will be working directly with our Lead Architect to analyze business problems, design secure solutions, and build them. While your focus will be heavy on the Backend (Python), you must be comfortable handling basic UI work (templating/CSS) to ship complete features.

As a SOC2 certified company, we prioritize security while maintaining a fast-paced development lifecycle. We are also beginning to explore AI and LLM integrations, making this an exciting time to join if you are looking to expand your skillset in that direction.

Note that a cover letter is required. If one isn’t included, your application will be auto-declined.

What You’ll Do

• Backend Development: Build robust, scalable applications using Python (Django & Flask).
• Systems Analysis: Work with the Lead Architect to break down vague requirements into concrete technical specs.
• Database Management: Design efficient schemas and write optimized queries for PostgreSQL.
• Security & Compliance: Write code that adheres to SOC2 controls and OWASP security standards.
• Basic Frontend: Handle server-side rendering and templating (Jinja2/Django Templates) and basic CSS layout—no comple