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Member of Technical Staff - Evaluations

Reflection· Research
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San Francisco, CA, London, New York, NYFull-timePosted 9mo ago

About the role

Role focused on evaluating and advancing model capabilities through rigorous evaluation systems, collaborative translation of insights into model improvements, and development of generalizable evaluation frameworks for reasoning, alignment, and usefulness.

Responsibilities

  • Conduct critical comparative analysis to advance our understanding of model capabilities
  • Build and refine evaluation systems and processes that create tight feedback loops between data, evals, and model behavior
  • Develop generalizable evaluation frameworks that capture what matters for reasoning, alignment, and usefulness.
  • Collaborate closely with pre-training, post-training, and applied teams to translate insights into model improvements.
  • Push the boundaries of what’s measurable, from synthetic evals to human feedback and real-world interaction data.

Qualifications

  • Strong statistical analysis and experimental design skills to rigorously measure model improvements
  • Familiarity with LLM evaluation methodologies: static benchmarks, human preference evals, and/or agentic tasks.
  • High agency and thrive in a fast-paced startup environment; bias for impact over process.
  • Excited to work in a new frontier lab, defining how we measure and accelerate progress toward more capable models.
  • Collaborative, detail-oriented, and motivated by building the feedback loops that make models truly improve.

Skills

Required:Statistical analysisLLM evaluation methodologies

Benefits

  • Top-tier compensation: Salary and equity structured to recognize and retain our talent globally.
  • Stock options: Everyone who joins and contributes to Reflection's success gets to share in the upside through stock options.
  • Health & wellness: Comprehensive medical, dental, vision, and life, with an annual wellness allowance.
  • Meals: Lunch and dinner are provided in the office daily.
  • Life & family: 22 weeks paid parental leave for all new birthing and non-birthing parents, including adoptive and surrogate journeys.
  • Vacation days: Unlimited paid time off in the U.S. and 30 days in the U.K.
  • Sponsorship support: We sponsor visas to help exceptional talent join our team and support long-term immigration pathways where applicable.
  • Team building: We have regular off-sites, happy hours, and team celebrations.
Last updated Oct 1, 2026. Interested? Apply on the company site.

About Reflection

Building frontier open intelligence

Building frontier open intelligence.

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