# Member Of Technical Staff

**Company:** [Perplexity](https://hotfix.jobs/companies/perplexity)
**Location:** Belgrade, Serbia, London, United Kingdom
**Role:** ML Engineering
**Experience:** 5+ years
**Skills:** Machine Learning, Search Systems, Recommender Systems, Neural Ranking, Ranking Systems, Retrieval Models, Classification Models, LLMs, Feature Computation, Low-Latency Inference, Model Serving, Monitoring, Python, Data Engineering, Evaluation
**Posted:** 2026-08-12

> Build and operate machine-learning systems that improve search ranking quality across retrieval and later-stage ranking. The role requires deep search or recommender-systems expertise, production ranking ownership, and at least five years of relevant industry experience.

## Job Description

## Responsibilities
- Push search quality forward through models, data, evaluation, infrastructure, and other available leverage.
- Own ranking-quality problems end to end: define evaluations, identify bottlenecks, build solutions, and ship them 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.
- Balance quality, latency, reliability, cost, and engineering complexity.
- Collaborate across Data, AI, Infrastructure, and Product while retaining ownership of final quality outcomes.

## Requirements
- Deep understanding of search or recommender systems and their evaluation.
- Proven ownership of a large-scale production ranking system or substantial quality problems.
- Strong machine-learning and software-engineering skills across data, models, serving, and monitoring.
- Ability to drive ambiguous, cross-team problems independently.
- Exceptional depth in modern neural ranking methods or low-latency ranking systems and runtime.
- Minimum 5 years of relevant industry experience.

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**Apply:** https://hotfix.jobs/jobs/9c93c0dd-d666-4026-a591-f56e40312151
**Canonical:** https://hotfix.jobs/jobs/9c93c0dd-d666-4026-a591-f56e40312151