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# Machine Learning Engineer

- **Company:** Postaladdress
- **Location:** UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Machine Learning, Recommender Systems, Large Language Models
- **Published:** September 5, 2026
- **Apply:** https://startup.jobs/member-of-technical-staff-machine-learning-engineer-ranking-quality-search-perplexity-8988923

## About the Role

Perplexity is seeking an experienced Machine Learning Engineer to improve search quality across the middle and later stages of ranking. We are looking for a strong ranking generalist who can own ambiguous problems end to end and brings exceptional depth in either neural ranking or production ranking systems., * Deep understanding of search or recommender systems and their evaluation.

 * Proven ownership of a large-scale production ranking system or a substantial class of quality problems.
 * Strong machine-learning and software-engineering skills across data, models, serving, and monitoring.
 * Ability to drive ambiguous, cross-team problems without continuous task decomposition.
 * Exceptional depth in either modern neural ranking methods or low-latency ranking systems and runtime.
 * Minimum 5 years of relevant industry experience.

## Description

* Relentlessly push search quality forward through models, data, evaluation, infrastructure, or any other leverage available.
 * Own ranking-quality problems end to end: define the evaluation, identify the bottleneck, build the solution, and ship it safely.
 * Train and evaluate retrieval, ranking, and classification models, including neural and LLM-based approaches where appropriate.
 * Build and operate ranking infrastructure, including feature computation, low-latency inference, multi-stage cascades, deployment, and monitoring.
 * Make sound trade-offs across quality, latency, reliability, cost, and engineering complexity.
 * Collaborate across Data, AI, Infrastructure, and Product while retaining ownership of the final quality outcome.


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