Senior Backend Engineer - Search Features & APIs (SABR)

About this role

Build and operate backend services powering e-commerce search, browsing, autocomplete, and recommendations. Own features end to end, with a focus on public API design, performance, reliability, and production operations.

About the company

Constructor is an AI search and product discovery platform for ecommerce that helps retailers improve conversion through personalized search and recommendations.

The team

SABR team, responsible for product discovery request processing, customer configuration APIs, and the MCP layer for AI agents.

Stack

What you'll do

• Design and deliver features and components for product discovery services.
• Evolve public APIs while maintaining backward compatibility.
• Improve service performance, reliability, and observability.
• Lead design and code reviews and mentor mid-level engineers.
• Partner with product, support, and engineering teams to address customer needs.
• Participate in on-call and lead incident response and follow-up.

What we're looking for

• Extensive Python experience and a track record of operating production backend services.
• Experience with observability tools and debugging live performance issues.
• Experience designing customer-facing public APIs and scalable service-oriented architectures.
• Demonstrated end-to-end project ownership, including leading small engineering efforts.
• Strong written communication, judgment, collaboration, and comfort with ambiguity.

Nice to have

• AWS experience.
• Experience with search, ranking, information retrieval, or e-commerce discovery.
• Exposure to MCP, agent tooling, or other AI/LLM-facing infrastructure.

Benefits

• Unlimited vacation, with at least three weeks encouraged annually.
• Fully remote work and a home-office stipend.
• Apple laptop provided.
• Annual training and development budget.
• Maternity and paternity leave for qualified employees.
• Stock options.
• Regular team offsites.