Constructor
Senior Machine Learning Engineer: ML Recall
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Senior Machine Learning Engineer – Recall Team (Constructor)
About Constructor
Constructor is the next-generation platform for search and discovery in ecommerce, built to optimize revenue, conversion rate, and profit. Our in-house search engine—powered by transformers and generative LLMs—enables features like:
- Search (text, visual, and multimodal)
- Recommendations
- Shopping agents
We pride ourselves on leading AI innovation, with an engine that has never lost an A/B test against competitors. Our system handles 1+ billion queries daily across 150 languages and 100+ countries, serving major brands like Sephora, Under Armour, and Petco.
We value empathy, curiosity, continuous improvement, and a focus on metrics that matter. Founded in 2019 by Eli Finkelshteyn and Dan McCormick, Constructor is a U.S.-based company committed to scalable, innovative AI solutions.
Role Overview
The Machine Learning Recall team builds and optimizes ML/DL models to improve customer experience by maximizing:
- Relevancy (aesthetic effectiveness)
- Marginality (business impact)
2025 Focus Areas
- Recall Optimization: Prevent losing high-value results
- Visual Solutions: End-to-end visual AI (e.g., image search, "shop the look," visual recommendations)
- Technical Platform: Standardize internal models to be widely adopted across teams
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Key Challenges
- Build and deploy scalable ML systems (including multimodal models like text+image)
- Tune LLMs to enhance system capabilities beyond current applications
- Drive business KPI improvements via data-driven hypotheses
- Collaborate with engineering teams to exchange best practices
- Own end-to-end responsibility for team deliverables
Requirements
Must-Have
✅ 3+ years in applied machine learning ✅ Expertise in NLP (especially transformer-based approaches) ✅ Strong foundation in classical machine learning ✅ Advanced Python proficiency ✅ Experience with deep learning frameworks (PyTorch emphasis) ✅ SQL knowledge (we use SparkSQL & MySQL) ✅ Production ML deployment experience ✅ Proficiency in big data tools (e.g., PySpark for E2E pipelines) ✅ Ability to translate intuition into data-driven solutions with measurable business value ✅ Proactive problem-solving mindset ✅ Collaborative and helpful attitude toward teammates
Nice-to-Have
🔹 A/B testing design, execution, and analysis 🔹 Rust/C/C++ development experience 🔹 Familiarity with public cloud platforms (AWS/Azure/GCP) 🔹 Deep knowledge of data structures/algorithms and trade-offs 🔹 Empathy (bridging complex concepts for >engineering teams) 🔹 Passion for performance optimization (result quality + code efficiency)
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Benefits
🏝️ Unlimited PTO (minimum 3 weeks/year encouraged) 🌎 Fully remote—work from anywhere 🛋️ Work-from-home stipend to set up your ideal workspace 💻 Apple laptops for new hires 🎓 Annual training & development budget 👶 Paid maternity & paternity leave (eligible employees) 🧠 Work with world-class engineers who foster growth 💵 Base salary: $80K–$120K USD (living wage) 📈 Stock options on top of base salary 🎉 Regular offsites for team bonding & collaboration 🤝 Commitment to diversity, equity, and inclusion (DEI)—we celebrate varied perspectives!
At Constructor, we believe the best candidates come from all backgrounds. If you resonate with some requirements, we encourage you to apply—your unique skills may align perfectly with our needs.
(Apply via Constructor’s careers page.)
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