Perplexity
Member of Technical Staff (Machine Learning Engineer, Ranking Quality - Search)
- Location
- Belgrade, RS
- Employment type
- Full-time
- Level
- Staff
- Posted
- 12 August 2026 (about a month ago)
Checked 14 days agoApplications go to the employer, never to RoleSprint
About this 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.
Responsibilities
- 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.
Qualifications
- 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.
Locations
- Belgrade, RS
- London, GB
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About this listing
Advertised by Perplexity and published on Ashby, the applicant tracking system they use.
RoleSprint is not the employer and not a recruiter. Applications are made on the employer’s own site and never reach us; what RoleSprint does is help you decide whether a role is worth your time and prepare for it if it is.
Published 12 August 2026, last checked 14 days ago. A posting stops being advertised here 90 days after the employer published it, and one the employer takes down is marked closed rather than quietly removed.