AI research scientist

Writer; San Francisco (CA); On-site; USD 150,000 - 200,000; Full time

Benefits offered by this job

Generous PTO

Medical, dental, and vision coverage

Paid parental leave (16 weeks)

Wellness and learning stipends

Company-wide off-sites

Job summary

WRITER, located in California, is searching for a Senior AI Research Scientist to lead innovative projects centered on large language models and agentic reasoning. The role emphasizes the exploration of advanced AI techniques and their application in enterprise AI solutions. Candidates should have extensive experience in ML research and a strong publication record. This hybrid position offers the flexibility of both San Francisco and New York City offices.

The ideal applicant will be at the forefront of AI research, driving substantial contributions to the field while collaborating with diverse teams across WRITER.

Qualifications

• 7+ years of hands-on ML research experience with large language models.
• Proven experience in building scalable training pipelines.
• Strong backdrop in post-training methods.

Responsibilities

• Lead research on language models and agentic systems.
• Design large-scale post-training experiments.
• Develop scalable data synthesis and curation pipelines.

Skills

Large language model pre-training expertise

Python programming

PyTorch or JAX

Multi-step reasoning and planning

Research publication record

Education

Ph.D. in Computer Science, Machine Learning, NLP or related field

Tools

ML frameworks like PyTorch and JAX

Job description

About the role

AI research at WRITER isn't just about publishing papers — it's about building the scientific foundation that powers some of the most ambitious enterprise AI deployments in the world. As an AI research scientist, you'll be at the center of that work. You'll drive a high-impact research agenda focused on large language models, agentic reasoning, and the system-level capabilities that make AI genuinely useful at enterprise scale. This is a rare opportunity to do research that matters twice over — advancing the field and shipping directly into products used by hundreds of thousands of people every day.

We're at an inflection point. Enterprises are moving from experimenting with AI to deeply embedding it across their operations, and WRITER's models are the engine making that possible. The work you do here — on post‑training, planning, multi‑step reasoning, and agentic workflows — will directly shape how the next generation of enterprise AI behaves, performs, and scales. You'll have the resources, infrastructure, and cross‑functional support to pursue ambitious ideas and bring them to life quickly.

This role is hybrid, based out of our San Francisco or New York City hub. You'll report to our VP of AI research.

*Please note: role is open to Senior, Staff, and Sr. Staff applicants

What you’ll do

• Lead an independent, high‑impact research agenda on large language models and agentic systems, owning projects from early hypothesis through model training, evaluation, and production deployment.

• Design and execute large‑scale post‑training experiments using supervised fine‑tuning, reinforcement learning from human feedback (RLHF), RLAIF, DPO, and emerging alignment techniques — with a focus on improving multi‑step reasoning, planning, and tool use in enterprise agentic workflows.

• Build novel evaluation benchmarks and methodologies that push beyond existing limitations, establishing rigorous measures for how well models perform on complex, real‑world enterprise tasks.

• Develop scalable data synthesis and curation pipelines that generate the high‑quality training signal driving model improvement — including LLM‑as‑judge frameworks, synthetic data generation, and adversarial dataset construction.

• Shape WRITER’s model architecture and training roadmap by translating your research insights into concrete improvements to our enterprise‑grade LLMs, working hand‑in‑hand with research engineering and product teams.

• Publish and present original research at top‑tier venues — NeurIPS, ICLR, ICML, ACL, and others — representing WRITER at the frontier of the field and contributing to the broader scientific community.

• Mentor and uplevel fellow researchers and engineers on the team, helping set a high bar for scientific rigor, experimental design, and research culture.

What you need

• 7+ years of hands‑on ML research experience, with deep expertise in large language model pre‑training and post‑training — you've trained models at scale, debugged distributed jobs, and shipped improvements that made a measurable difference.

• A Ph.D. in Computer Science, Machine Learning, NLP, or a related field — or equivalent demonstrated research experience with a strong portfolio of independent, published work.

• Expert‑level knowledge of post‑training methods including SFT, RLHF, RLAIF, DPO, GRPO, and related alignment and reasoning techniques, with a track record of applying them to real, production‑grade systems.

• Strong command of Python and PyTorch (or JAX), with the engineering depth to build and scale training pipelines, evaluation infrastructure, and data synthesis workflows yourself — not just direct others to do it.

• A meaningful publication record at competitive ML/AI venues (NeurIPS, ICLR, ICML, ACL, EMNLP, or equivalent), evidencing your ability to originate ideas and execute on a multi‑month research agenda independently.

• Hands‑on experience designing or evaluating agentic systems — models that plan, reason through multi‑step tasks, use tools, and recover gracefully from errors — with a nuanced understanding of where they break and how to fix them.

• The instincts and orientation that match WRITER’s values: you Connect — you collaborate openly across research, engineering, and product and communicate complex ideas with clarity to both technical and non‑technical audiences; you Challenge — you ask the hard questions, push back on conventional wisdom, and pursue the research directions others haven’t tried yet; you Own — you drive your projects end‑to‑end with urgency, take accountability for results, and care deeply about the impact your work has on real customers.

Benefits & perks (US Full‑time employees)

• Generous PTO, plus company holidays

• Medical, dental, and vision coverage for you and your family

• Paid parental leave for all parents (16 weeks)

• Fertility and family planning support

• Early‑detection cancer testing through Galleri

• Flexible spending account and dependent FSA options

• Health savings account for eligible plans with company contribution

• Annual work‑life stipends for:

  • Wellness stipend for gym, massage/chiropractor, personal training, etc.
  • Learning and development stipend

• Company‑wide off‑sites and team off‑sites

• Competitive compensation, company stock options and 401k

WRITER is an equal‑opportunity employer and is committed to diversity. We don't make hiring or employment decisions based on race, color, religion, creed, gender, national origin, age, disability, veteran status, marital status, pregnancy, sex, gender expression or identity, sexual orientation, citizenship, or any other basis protected by applicable local, state or federal law. Under the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.