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Backend Engineer: AI Shopping Agents at Constructor. About us. Constructor is the next-generation platform for search and discovery in ecommerce, 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 this and work on the bleeding edge of AI to do so.. Out of necessity, our engine is built for extreme scale and powers over 1 billion queries every day across 150 languages and roughly 100 countries. It is used by some of the biggest ecommerce companies in the world like Sephora, Under Armour, and Petco.. We’re a passionate team who love solving problems and want to make our customers’ and coworkers’ lives better. We value empathy, openness, curiosity, continuous improvement, and are excited by metrics that matter. We believe that empowering everyone in a company to do what they do best can lead to great things.. Constructor is a U.S. based company that has been in the market since 2019. It was founded by Eli Finkelshteyn and Dan McCormick who still lead the company today.. About the Team. The AI Shopping Agents team is building the next generation of e-commerce, creating entirely new ways for shoppers to discover products. We design and power AI-driven shopping agents that help users find what they need, ranging from intelligent search experiences to conversational, personalized product assistance. We’re a passionate cross-functional team that works end-to-end: from integrating with our core search and personalization engine to delivering user-facing agent experiences. We value openness, curiosity, continuous improvement, and great code, and we believe that empowering everyone in the team to own and drive their ideas leads to the best products.. About the Job. The primary focus of this job is to design, deliver & maintain web and data pipeline services in close collaboration with other engineers.. Build, deploy, and support backend services. Define cloud infrastructure using AWS CloudFormation and maintain CI/CD pipelines with GitHub Actions. Improve and operate our observability stack. Collaborate with technical and non-technical stakeholders to design, develop, and refine features. Communicate effectively with stakeholders within and outside the team. Contribute to data processing pipelines and ETL processes. Strong proficiency in Python and server-side web development (API design, concurrency/asynchronous programming). Experience designing, building, and operating production backend services (performance, reliability, on-call/operations mindset). Experience with Infrastructure as Code and cloud resource management (AWS preferred; Azure/GCP also fine). Hands-on experience building or maintaining CI/CD pipelines. Experience with observability: metrics/logs/traces, dashboards, and alerting. Experience working with databases, including at least one relational and one NoSQL system  (e.g., PostgreSQL, DynamoDB). Nice to Haves. Experience with high-load and/or real-time systems. Experience with distributed/service-oriented architectures, including interface definition and binary RPC (e.g., Protobuf/gRPC). Familiarity with additional vector databases. Experience contributing to or owning ETL/data pipeline systems at scale. Company Location: Spain.