Sign up to access all features of our service.
  • Job search
  • Favorites
  • Create a CV
    New
  • Salaries
  • Subscriptions

Member of Technical Staff - Pre-Training

Reflection AI, Inc

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
  • Research and build solutions across algorithms, scaling laws, data processing, optimizers, and model architecture.
  • Design and run scientific experiments to advance our understanding of scaling large language models and data efficiency.
  • Implement state-of-the-art methods from the deep learning literature.
  • Lead small research projects independently while collaborating on larger initiatives
  • Optimize the training infrastructure for efficient scaling.
  • Contribute across the entire stack, from low-level optimizations to high-level model design.
About You
  • Graduate degree (MS or PhD) in Computer Science, Machine Learning, or related discipline.
  • Solid software engineering capabilities with experience building large-scale systems.
  • Experience with large-scale ETL workflows and training data preparation.
  • Deep understanding of large-scale ML, especially as it relates to language models, distributed training, and scaling.
  • Proficient in Python and deep learning frameworks (PyTorch preferred).
  • Navigate trade-offs between research objectives and practical engineering realities.
  • Thrive in a fast-paced, high-agency startup environment with bias toward action.
  • Strong communication capabilities and comfort working collaboratively.
  • Passionate about advancing the frontier of intelligence.
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.
Vacancy posted 6 days ago
Similar jobs that could be interesting for youBased on the Member of Technical Staff - Pre-Training in San Francisco, CA vacancy
  • $225k

     ...code generation to improve models and solve alignment more reliably than humans can alone. Our approach combines frontier-scale pre-training, domain-specific RL, ultra-long context, and inference-time compute to achieve this goal. About the Role As a Software Engineer... 
    Training
    Relocation
    Visa sponsorship

    Magic Inc

    San Francisco, CA
    1 day ago
  •  ..., OpenAI, Google Brain, Meta, Character.AI, Anthropic and beyond. About the Role Build and scale distributed training systems that power frontier model pre-training. Work closely with research teams to design and operate large-scale training runs for foundation models... 
    Training
    Relocation package

    Reflection

    San Francisco, CA
    8 days ago
  • $60k - $240k

    Member of Technical Staff - Data Quality Engineer (Pre-training) Join to apply for the Member of Technical Staff - Data Quality Engineer (Pre-training) role at Reflection AI Our Mission Reflection’s mission is to build open superintelligence and make it accessible to... 
    Training
    Relocation package

    Reflection AI

    San Francisco, CA
    3 days ago
  • $200k

     ...than humans can alone. Our approach combines frontier-scale pre-training, domain-specific RL, ultra-long context, and inference-...  ...many of the company's most important decisions. As a Member of Technical Staff on Evals, you will build both the platform and the evaluations... 
    Training
    Visa sponsorship
    Relocation package

    Magic Inc

    San Francisco, CA
    21 hours ago
  • $180k

     ...Member Of Technical Staff - RL Infrastructure Palo Alto, CA xAI's mission is to create AI systems that can accurately...  ...have been collected that require complex pre-processing to prepare it for large-scale RL training. How do we standardize our preprocessing pipelines... 
    Training
    Temporary work

    Xai

    San Francisco, CA
    1 day ago
  • $200k

    Member of Technical Staff, RL Research & Environments Posted Feb 28, 2026 | Full-time | Advanced (5-10 yrs) Magic’s mission is to build safe...  ...humans can alone. Our approach combines frontier-scale pre-training, domain-specific RL, ultra-long context, and inference-time... 
    Training
    Full time
    Relocation
    Visa sponsorship

    Magic

    San Francisco, CA
    2 days ago
  • Member of Technical Staff, Pretraining Science Member of Technical Staff, Pre-Training Science Location: SF Bay Area or Tokyo, Japan Type: Full-time About Radical Numerics Radical Numerics is an AI lab bringing the rigor of distributed systems, model architecture, and... 
    Training
    Full time

    Radical Numerics

    San Francisco, CA
    5 days ago
  • $300k

    Member of Technical Staff - RL Algorithms About V max V max is an applied research lab developing AI capable...  ...become the de-facto method of post-training LLMs. We are limited by the sample...  ...talented researcher to weave together pre-LLM and post-LLM approaches to learning... 
    Training
    Work at office
    Local area
    Shift work

    Vmax

    San Francisco, CA
    1 day ago
  • Member of Technical Staff - Post‑Training Join to apply for the Member of Technical Staff - Post‑Training role at Reflection AI . Our Mission Reflection’...  ...About The Role Build systems that transform powerful pre‑trained models into aligned and general agents. Drive research... 
    Training
    Full time
    Relocation package

    Reflection AI

    San Francisco, CA
    5 days ago
  • $150k - $350k

    Member of Technical Staff, Applied Research — Sieve Location: San Francisco, CA (Onsite) Compensation:...  ...intelligence. Their thesis: high-quality video training data is the key bottleneck limiting...  ...Applied model optimization and pre/post-processing optimization Parallelized... 
    Training
    Full time
    H1b
    Visa sponsorship

    David Joseph & Company

    San Francisco, CA
    1 day ago
  • $150k - $300k

     ...infrastructure that lets anyone create, train, and deploy them. We aggregate and orchestrate...  ...that runs the jobs. Core Technical Responsibilities Hosted Training Infrastructure...  ...in open development and encourage team members to contribute to the broader AI community... 
    Training
    Work at office
    Local area
    Remote work
    Visa sponsorship
    Relocation package
    Flexible hours

    Prime Intellect

    San Francisco, CA
    1 day ago
  •  ...Member of Technical Staff, Product Development Mirendil Mirendil is a tech-first company focused on solving core bottlenecks that unlock...  .... We are building a frontier AI research company and training our own models end-to-end. Our work spans areas such as... 
    Training

    Mirendil

    San Francisco, CA
    4 days ago
  •  ...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,... 
    Training
    Relocation package

    Reflection AI

    San Francisco, CA
    1 day ago
  •  ...Member Of Technical Staff - Image / Video Generation Freiburg (Germany) About Black Forest Labs We're the team behind Latent Diffusion...  ...that expands human creativity. Why This Role You'll train large-scale diffusion models for image and video generation... 
    Training
    Remote work
    Worldwide
    2 days per week

    Black Forest Labs

    San Francisco, CA
    1 day ago
  •  ...creatively, and squeezing performance through pre/post-processing, parallelism, inference...  ...translate ambiguous needs into concrete technical systems Strong Python developer with...  ...delivering end-to-end outcomes, not just training models or writing research code Bonus:... 
    Training

    Sieve, Inc.

    San Francisco, CA
    4 days ago
  • $256k - $276k

     ...picture and our vision at Postman. The Opportunity As a Member of Technical Staff on AI Infrastructure, you will build and maintain the...  ...and distributed infrastructure that power AI model post training, inference, and data pipelines. You will collaborate with... 
    Training
    Work at office
    Flexible hours
    3 days per week

    Postman

    San Francisco, CA
    3 days ago
  •  ...Member Of Technical Staff @ Lotus AI Lotus AI is a groundbreaking primary care app that integrates your medical records, AI, and real doctors...  ...This is a generalist role. You may work across model training and fine-tuning, model tooling, data pipelines, retrieval/... 
    Training

    Lotus Health

    San Francisco, CA
    1 day ago
  •  ...Member Of Technical Staff, Training Infra Bay Area Ai Systems Inception creates the world's fastest, most efficient AI models. Our Mercury model is the world's fastest reasoning LLM and first commercially available diffusion LLM, delivering 5x greater speed and efficiency... 
    Training
    Immediate start
    Flexible hours

    Inception LLC

    San Francisco, CA
    1 day ago
  • $150k

     ...Amazon's Frontier AI & Robotics (FAR) team is seeking a Member of Technical Staff to drive foundational research and build intelligent robotic...  ...computational infrastructure and rich real-world datasets to train and deploy state-of-the-art foundation models. Our work spans... 
    Training
    Local area

    Amazon

    San Francisco, CA
    4 days ago
  • $150k

     ...We are seeking a Member of Technical Staff Simulation Engineer to join our AI robotics research team developing foundation models for robotics...  ...photorealistic simulations alongside scientists to enable training large-scale machine learning models. Key job responsibilities... 
    Training
    Internship
    Local area

    Amazon

    San Francisco, CA
    1 day ago
  • $150k - $300k

     ...the infra that enables anyone to create, train, and deploy them. We aggregate and orchestrate...  ..., robust, and reliable at scale. Core Technical Responsibilities Infrastructure...  ...believe in open development and encourage team members to contribute to the broader AI community... 
    Training
    Work at office
    Remote work
    Visa sponsorship
    Relocation package
    Flexible hours

    Prime Intellect

    San Francisco, CA
    2 days ago
  • $150k - $300k

     ...the infra that enables anyone to create, train, and deploy them. We aggregate and orchestrate...  ...into our RL training stack. Core Technical Responsibilities LLM Serving Multi‑tenant...  ...believe in open development and encourage team members to contribute to the broader AI community... 
    Training
    Work at office
    Remote work
    Visa sponsorship
    Relocation package
    Flexible hours
    Shift work

    Prime Intellect

    San Francisco, CA
    5 days ago
  •  ...alumni - Michael (DeepMind Robotics Reasoning), Arjun (RL post-training at Apple), and Ronak (Windsurf/DeepMind; trained SWE-1,...  ...core agent products. We’re building our team of founding Members of Technical Staff to design the frontier of continually learning systems.... 
    Training

    Trajectory

    San Francisco, CA
    4 days ago
  • Job Description We’re looking for a Member of Technical Staff to build and deploy production-grade AI systems. In this role, you’ll work across...  ...Systems Engineering: Design scalable pipelines for training, inference, and data processing Performance Optimization:... 
    Training

    ERAGON

    San Francisco, CA
    4 days ago
  •  ...Member of Technical Staff, Model Efficiency Who are we? Our mission is to scale intelligence to serve humanity. We’re training and deploying frontier models for developers and enterprises who are building AI systems to power magical experiences like content generation... 
    Training
    Full time
    Work at office
    Remote work
    Flexible hours

    Cohere

    San Francisco, CA
    5 days ago
  • $300k

    Member of Technical Staff - Mechanistic Interpretability About V max V max is an applied research lab developing AI capable of open-ended learning...  ...for using mechanistic interpretability to extract useful training signals from the internal states of language models. Turn... 
    Training
    Work at office
    Local area

    Vmax

    San Francisco, CA
    4 days ago
  • $225k

     ...code generation to improve models and solve alignment more reliably than humans can alone. Our approach combines frontier-scale pre‑training, domain‑specific RL, ultra‑long context, and inference‑time compute to achieve this goal. About The Role As a Kernel Engineer,... 
    Training
    Relocation
    Visa sponsorship

    Magic

    San Francisco, CA
    1 day ago
  • $300k

    Member of Technical Staff - RL Infrastructure About V max V max is an applied research lab developing AI capable of open-ended learning. We are...  ...the systems layer for RL at scale: distributed rollouts, training orchestration, inference, evals, data pipelines, observability... 
    Training
    Work at office
    Local area

    Vmax

    San Francisco, CA
    1 day ago
  • $150k - $350k

     ...biggest bottleneck in growth of these applications: high‑quality training data. We’ve partnered with top AI labs and did $XXM last...  ...squeezing every drop of performance out of them through clever pre/post‑processing, parallelism, pipelining, inference optimization... 
    Training

    Sieve

    San Francisco, CA
    3 days ago
  • Member of Technical Staff, Post-Training Location: SF Bay Area or Tokyo, Japan Type: Full-time About Radical Numerics Radical Numerics is an AI lab bringing the rigor of distributed systems, model architecture, and numerics research to the challenges of biology. We are... 
    Training
    Full time

    Radical Numerics

    San Francisco, CA
    3 days ago

Do you want to receive more vacancies?

Subscribe and receive similar vacancies to Member of Technical Staff - Pre-Training. Be the first to apply!