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Perplexity

Senior Machine Learning Engineer - Search - London

London Full-Time No home office possible

Senior Machine Learning Engineer – Search – London

Join to apply for the Senior Machine Learning Engineer – Search – London role at Perplexity

Senior Machine Learning Engineer – Search – London

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Perplexity is seeking an experienced Senior Machine Learning Engineer to help build the next generation of advanced search technologies, with a focus on retrieval and ranking.
Responsibilities

Relentlessly push search quality forward—through models, data, tools, or any other leverage available
Architect and build core components of our search platform and model stack
Train and evaluate retrieval, ranking and classification models, including LLMs
Deploy models – from boosting to LLMs – in a scalable and performant way
Build and optimize RAG pipelines for grounding and answer generation
Collaborate with Data, AI, Infrastructure and Product teams to ensure fast and high quality delivery

Qualifications

Deep understanding of search and retrieval systems, including quality evaluation principles and metrics
Proven track record with large-scale search or recommender systems
Hands-on experience with transformer-based models for dense retrieval, ranking, and classification in large-scale search systems
Master’s degree or PhD in Engineering, Computer Science, Math, Physics, or a related field.
8 years of experience in software development and with data structures/algorithms in either (C, C++, Python, Java, Go or Rust).
5 years of experience with ML design and ML infrastructure (e.g., model deployment, model evaluation, data processing, debugging, fine tuning).
5 years of experience designing, training, and evaluating machine learning models.
3 years of experience in a technical leadership role leading project teams and setting technical direction.
Self-driven, with a strong sense of ownership and execution

Our cash compensation range for this role is $160,000 – $250,000.
At Perplexity, we\’ve experienced tremendous growth and adoption since publicly launching the world\’s first fully functional conversational answer engine in 2022. We\’ve grown from answering 2.5 million questions per day at the start of 2024 to around 20 million daily queries in December 2024. We also offer Perplexity Enterprise Pro, which counts leading companies like Nvidia, the Cleveland Cavaliers, Bridgewater, and Zoom as customers.
To support our rapid expansion, we\’ve raised significant funding from some of the most respected technology investors. Our investor base includes IVP, NEA, Jeff Bezos, NVIDIA, Databricks, Bessemer Venture Partners, Elad Gil, Nat Friedman, Daniel Gross, Naval Ravikant, Tobi Lutke, and many other visionary individuals. In 2024, our employee base grew nearly 300%, and we\’re just getting started.
Final offer amounts are determined by multiple factors, including, experience and expertise, and may vary from the amounts listed above.
Equity: In addition to the base salary, equity is part of the total compensation package.

Seniority level

Seniority level

Mid-Senior level

Employment type

Employment type

Full-time

Job function

Job function

Engineering and Information Technology
Industries

Software Development

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