Member of Technical Staff - Evaluations

Sierra Ventures; San Francisco (CA); On-site; USD 150,000 - 210,000; Full time

Benefits offered by this job

Top-tier compensation

Stock options

Health & wellness

Job summary

Reflection, a research lab, seeks to advance open and accessible intelligence. You will conduct rigorous comparative analyses, build evaluation systems, and develop frameworks that capture reasoning and alignment advances.

You will collaborate with pre-training, post-training, and applied teams to translate insights into model improvements. The role emphasizes high agency in a fast-paced startup environment, with the chance to push measurable boundaries and contribute to open foundational

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.

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.

Skills

Statistical analysis

Experimental design

LLM evaluation methodologies

Fast-paced startup mindset

Collaboration & communication

Job description

Our Mission

Reflection is a research lab making intelligence open and accessible for everyone to use, customize, and build on. We build open models that let anyone control their intelligence and help shape the future of AI. Our mission: make intelligence open and accessible to all.

About the Role

• 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.
  

About You

• 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.

What We Offer:

We believe that to make intelligence open and accessible to all, you need to start at the foundation. Joining Reflection means building from the ground up as part of a talent-dense team. You will help define our future as a company, and help define the future of open foundational models.

We want you to do the most impactful work of your career with the confidence that you and the people you care about most are supported.

• 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.

Export Control Notice: This position may require access to technology or source code subject to the U.S. Export Administration Regulations. Any offer of employment for this role may be conditioned on the Company's ability to provide the candidate with access to such technology or source code in compliance with applicable U.S. export control laws, which may require the Company to seek government authorization.

Candidate and Employee Privacy Notice: We collect and process personal data about applicants for the purposes described in our Candidate and Employee Privacy Notice