BackEnd Engineer: Experiments

This is primarily a backend role (Python services + data-heavy systems). You'll occasionally work in the Dash UI and contribute to Spark jobs, but those are not the main focus. We care about correctness, observability, and product usability more than complex infrastructure.

Tech: Python, FastAPI, PostgreSQL, Plotly Dash, PySpark/Databricks, AWS, CloudWatch, Sentry

(Spark work is ~5–10% — we don't expect you to be a data engineer or own the data platform.)

• 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)

You'll collaborate closely with Search/Recommendations engineers, ML/DS partners, and customer-facing teams when needed. This role does not require frequent direct customer calls.

• 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

• We don't expect you to already be an expert in experimentation methodology — but we do expect strong backend fundamentals and the ability to ramp up effectively in a data-heavy domain

• We're a distributed team. Preferred time zones are UTC+1 to UTC+7, but we're flexible

At Constructor.io we are committed to cultivating a work environment that is diverse, equitable, and inclusive. As an equal opportunity employer, we welcome individuals of all backgrounds and provide equal opportunities to all applicants regardless of their education, diversity of opinion, race, color, religion, gender, gender expression, sexual orientation, national origin, genetics, disability, age, veteran status or affiliation in any other protected group.

Studies have shown that women and people of color may be less likely to apply for jobs unless they meet every one of the qualifications listed. Our primary interest is in finding the best candidate for the job. We encourage you to apply even if you don't meet all of our listed qualifications.

How we handle your data. By submitting this application, you acknowledge that Constructor will collect and process the personal data you provide for the purpose of evaluating your candidacy for this role. If you are not selected, we will retain your data for a limited period as described in our Recruitment Privacy Notice. After that period your data will be deleted or anonymized.

• 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)