BackEnd Engineer: Experiments

Constructor builds search and discovery technology for ecommerce. The Backend Engineer will develop backend services and data-heavy systems for the Experiments platform, improving experiment assignment, logging, reporting, and user-facing tools.

Responsibilities:

• Build and maintain backend services for experiment assignment, logging, and report generation
• Improve scalability, performance, and reliability of experiment reporting pipelines
• Add product-facing features to the UI to help users launch experiments and interpret results
• Take technical ownership of projects: shape solutions, break down work, and drive execution with the team
• Participate in a weekly on-call rotation (investigating occasional issues and answering internal questions)

Requirements:

• Strong experience building and owning production backend services in Python
• Experience with monitoring, alerting, and debugging user-facing systems
• Strong SQL skills and confidence working with data-heavy systems (metrics, logging, analytics)
• Ability to ship maintainable software (tests, code review, incremental delivery)
• You take ownership: you can turn ambiguous problems into an executable technical plan
• You care about building systems people trust and rely on
• Experience with experimentation systems, metrics platforms, or A/B testing workflows
• Experience with PySpark and/or Databricks