Machine Learning Engineer, Ranking & Retrieval

At ClickUp, we're building the future of work: the first truly converged AI workspace unifying tasks, docs, chat, calendar, and enterprise search, all supercharged by context-driven AI. We are an AI-native company. Every team member is expected to leverage AI daily, and we evaluate AI fluency as part of our hiring process.

Join us and help redefine what's possible. 🚀

Machine Learning Engineer, Ranking & Retrieval

ClickUp is seeking an experienced Machine Learning Engineer to join our Search team. You'll own the ML systems that power search relevance for millions of users and ground our AI in the right context.

Your Impact at ClickUp

You'll own the full ML lifecycle for ranking and retrieval, from training through deployment and production serving. Our search indexes large-scale, user-generated content across a multi-tenant platform where permissions-aware retrieval is critical. You'll build the systems that decide what surfaces first.

Core Responsibilities

Train, deploy, and serve ranking models in production, owning the full ML lifecycle

Build ranker features, training pipelines, and offline evaluation frameworks

Design and scale hybrid retrieval combining lexical and vector search (including HNSW with disk offloading)

Run embedding inference at billions-of-documents scale

Improve query understanding through intent modeling and query expansion

Build permissions-aware retrieval that respects multi-tenant boundaries

Create measurement frameworks to evaluate and improve search quality

Collaborate with Search Infrastructure, AI, and backend teams to integrate ranking improvements across the platform

Technical Requirements

Bachelor's degree in Computer Science, Machine Learning, or related field

5+ years of ML engineering experience focused on ranking, retrieval, or information retrieval

Proven full ML lifecycle ownership: training, deploying, and serving models in production

Hands-on ranker model training: feature engineering, pipelines, offline evaluation

Experience building hybrid (lexical + vector) retrieval systems

Experience running embedding inference at large scale

Strong query understanding fundamentals: intent modeling, query expansion

Preferred Qualifications

• Permission-aware retrieval and multi-tenancy experience
• Indexing large-scale user-generated content (not small or static datasets)
• Hands-on experience with OpenSearch or Elasticsearch
• Sharding, index management, and real-time ingestion at scale
• Background in NLP, semantic search, or agentic retrieval
• Experience with TypeScript in backend systems
• Join Our Mission
• At ClickUp, we're committed to building the future of productivity software. As our Search Engineer, you'll play a crucial role in shaping the core functionality of our platform and driving our AI initiatives forward. Join us in our mission to make the world more productive!
• #LI-REMOTE
• Equal Opportunity Employer
• ClickUp is an Equal Opportunity Employer, and qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, or national origin.
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