Member of Technical Staff - Data and Evals bei Reflection

Our Mission

Reflection’s mission is to build open superintelligence and make it accessible to all.

We’re developing open weight models for individuals, agents, enterprises, and even nation states. Our team of AI researchers and company builders come from DeepMind, OpenAI, Google Brain, Meta, Character.AI, Anthropic and beyond.

About the Role

• Build the data and evaluation systems that determine and drive model quality across pre-training and post-training.

• Develop rigorous and generalizable evaluation frameworks for reasoning, alignment, and usefulness.

• Collaborate closely with pre-training, post-training, and applied teams to close the loop between data, evals, and model behavior.

• Push the boundaries of what’s measurable, from synthetic evals to human feedback and real-world interaction data.
  

About You

• Deep understanding of data quality, curation, and measurement in the context of large-scale ML.

• Experience building robust data or evaluation pipelines for foundation models or similar large systems.

• Familiarity with evaluation methodologies, including static benchmarks, human preference evals, and 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 build superintelligence that is truly open, you need to start at the foundation. Joining Reflection means building from the ground up as part of a small talent-dense team. You will help define our future as a company, and help define the frontier 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 the best talent globally.

• Health & wellness: Comprehensive medical, dental, vision, life, and disability insurance.

• Life & family: Fully paid parental leave for all new parents, including adoptive and surrogate journeys. Financial support for family planning.

• Benefits & balance: paid time off when you need it, relocation support, and more perks that optimize your time.

• Opportunities to connect with teammates: lunch and dinner are provided daily. We have regular off-sites and team celebrations.