perplexity - Member of Technical Staff (Data Scientist, Evals)
Requirements
• PhD or MS in a technical field or equivalent experience • 4+ years of experience in data science or machine learning • Strong proficiency in Python and SQL (expected to write production-grade code) • Experience building within a modern cloud data stack, specifically AWS and Databricks • Comfortable with agentic coding workflows and using AI-assisted development tools to iterate faster • 1+ years of experience working with LLMs at scale, specifically with LLM-as-a-judge setups • Prior experience working on customer-facing web products or consumer apps, with real user traffic at scale • A strong research background, with experience applying research methods to real-world ML problems • Experience defining evaluation metrics (e.g., factual consistency, hallucination rate, retrieval precision) and building ground truth datasets
Responsibilities
• Architect and maintain automated evaluation pipelines to assess answer quality across Perplexity's products, ensuring high standards for accuracy and helpfulness • Design evaluation sets and methods specifically to measure the impact of tool calls (particularly web search retrieval) on the final answer's quality • Develop VLM-based solutions to programmatically evaluate how final answers render visually across different platforms and devices • Continuously review public benchmarks and academic evaluations for their applicability to the Perplexity product, adapting and incorporating them into our regular performance measurements • Operate within a small, high-impact team where your evaluation metrics directly shape product changes, collaborating closely with technical leadership to measure and improve Answer Quality
Benefits
• $210K – $385K • Offers Equity • Full-time U.S. employees enjoy a comprehensive benefits program including equity, health, dental, vision, retirement, fitness, commuter and dependent care accounts, and more. • Full-time employees outside the U.S. enjoy a comprehensive benefits program tailored to their region of residence. • USD salary ranges apply only to U.S.-based positions. International salaries are set based on the local market. Final offer amounts are determined by multiple factors, including experience and expertise, and may vary from the amounts listed above. • Upload your resume here to autofill key application fields. • Drop your resume here! • Parsing your resume. Autofilling key fields... • or drag and drop here • Please open our Self-Assessment - a dialog with Perplexity will open. Upload your CV or paste it into the answer box in Markdown format. LLM will ask questions, if needed, and give a verdict. Please share a link to a thread with positive verdict. Only the shared conversation will be reviewed. • Self-Assessment • Do you agree to allow Perplexity to contact you about job opportunities for up to 2 years? • Recruiting Privacy Policy
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