Senior Backend Engineer: Offsite Search Optimisation

🌐 Remote💼 Full-time💰 $80,000–$80,000🗓 2026-09-24 → 2026-10-03

Core

Building and owning production backend services for an in-house search engine that powers ecommerce discovery, recommendations, and shopping agents.

Role type

Senior Backend Engineer (Search Infrastructure) (via careerplan.io/jobs/fa54dfad-3420-4d21-971c-87cee04116b0-senior-backend-engineer-offsite-search-optimisation-at-constructor)

Builds

High-scale search and personalization engine serving 1B+ daily queries

Domain

Ecommerce, Search, Generative AI

Deliverable

production ML models

Required skills

Python, SQL, Monitoring & Alerting, Debugging, Software Maintenance

Preferred skills

SEO fundamentals, OAuth2/APIs, Non-structured data handling, ETL/ELT workflows, PySpark

Technologies

Python, SQL, PySpark, OAuth2, GA4, Google Search Analytics API

Responsibilities

Build and maintain production backend services, work with data-heavy systems, monitor and debug user-facing systems, ship maintainable software with tests and code reviews

Seniority

Senior, hands-on IC

About Constructor

Constructor is the next-generation platform for search and discovery in e-commerce, built to explicitly optimize for metrics like revenue, conversion rate, and profit. Our search engine is entirely invented in-house utilizing transformers and generative LLMs, and we use its core and personalization capabilities to power everything from search itself to recommendations to shopping agents. Engineering is by far our largest department, and we’ve built our proprietary engine to be the best on the market, having never lost an A/B test to a competitive technology. We’re passionate about maintaining