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NewsBreak

Machine Learning Engineer, LLM Post-Training

NewsBreak · Mountain View, California, United States

Posted about 3 months ago

or apply directly on NewsBreak's site. We never take the application ourselves.

Is this posting real?

This role has been open
82 days
NewsBreak's roles stay open a median of 81 days
Reposted
No
Salary listed
No
15% of NewsBreak's roles list one
Ghost-job risk at NewsBreak
high
47 stale, 0 reposted of 55 open
Hiring momentum
61 roles opened in the last 90 days
↑ up vs. the prior 90 days
Last confirmed on the employer's board
2026-10-24

Measured from postings appearing on and disappearing from NewsBreak's own greenhouse board since 2026-08-03. Full hiring picture for NewsBreak.

About this role

The Machine Learning Engineer will focus on the post-training of large language models, emphasizing reinforcement learning. Responsibilities include leading the full post-training pipeline, designing data preparation strategies, collaborating with product and business teams, and ensuring model quality through evaluation pipelines. The role requires hands-on experience in training models and a strong understanding of data engineering for machine learning.

Our read on this posting2.6out of 5
benefits
3/5
freshness
1/5
career value
4/5
role clarity
5/5
pay transparency
0/5

Scored from the posting itself — how clearly the role is described, how much it says about pay and benefits, and how recently it was listed. Not a judgement of NewsBreak as an employer.

What you need

  • Hands-on LLM post-training experience including continuous pre-training, supervised fine-tuning, and reinforcement learning
  • Strong data engineering for ML, including designing data-preparation plans
  • Proven large-scale GPU training ability
  • Strong PyTorch fundamentals and familiarity with frameworks like Hugging Face TRL/Accelerate, DeepSpeed or FSDP
  • Solid understanding of tokenization, attention, and common failure modes in alignment/agent training
  • Strong communication skills and a bias toward fast iteration and business impact

Nice to have

  • Experience designing reward models or rule-based verifiers for RL
  • Experience with tool-use / agentic model training
  • Publications or open-source contributions in LLM post-training or RL

What you get

  • Health, dental, and vision care for you and your family (100% coverage for employee)
  • Top-tier 401(K) plan with company matching
  • Paid time off and paid holidays
  • FSA, HSA and commuter benefits programs
  • Team activity budget

Worth weighing

  • No specific technologies or frameworks beyond PyTorch and related tools mentioned
  • Salary range provided, but pay may vary based on multiple factors
  • High-ownership role may require strong self-management skills

Summarised from NewsBreak's posting. Read the full original.

Listed by NewsBreak on their greenhouse job board, last confirmed open on 2026-10-24. PitchMeAI is not the employer.

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