Backend Engineer (Experiments)

TL;DR

Backend Engineer (Python): Building and maintaining backend services for an experimentation platform with an accent on experiment assignment, logging, and report generation. Focus on improving scalability, performance, and reliability of reporting pipelines and taking technical ownership of projects.

Location: Fully remote team – choose where you live. Preferred time zones are UTC+1 to UTC+7, but we’re flexible.

Salary: $7,500 – $10,000/month net

Company

Constructor.io is a U.S.-based product company that develops a next-generation platform for search and discovery in e-commerce, explicitly optimizing for revenue, conversion rate, and profit using transformers and generative LLMs.

What you will do

• 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.

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 and can turn ambiguous problems into an executable technical plan.

Nice to have

• Experience with experimentation systems, metrics platforms, or A/B testing workflows.
• Experience with PySpark and/or Databricks.

Culture & Benefits

• Unlimited vacation time, with strong encouragement to take at least 3 weeks per year.
• Fully remote team with a work-from-home stipend.
• Apple laptops provided for new employees.
• Annual training and development budget.
• Maternity & Paternity leave for qualified employees.
• Stock options offered in addition to the base salary.
• Regular team offsites for connection and collaboration.