Member of Technical Staff (Machine Learning Engineer, Ranking Quality - Search)
Perplexity — Belgrade
Posted 2026-08-12
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 ow