Senior Research Engineer, Post-training - Remote - United States
1 day ago

Job summary
We're looking for Senior Research Engineers to join our AI Engineering team at Reddit. As a Senior Research Engineer on our team you will architect the evaluation suites and fine-tuning pipelines that determine if our models are safe smart and reddit-native you will build scalable SFT pipelines implement efficient distributed training loops for instruction tuning converting raw base models into helpful assistants develop model-as-a-judge systems engineer automated evaluation pipelines using strong models like GPT-5 Nova Claude execute synthetic data generation strategies create curate high-quality instruction sets to improve model generalization where human data is scarce collaborate with safety engineering translate high-level safety policies into concrete evaluation metrics unit tests that run in CI/CD pipelines debug post-training instability dive deep into loss curves evaluation logs identify when fine-tuning causes alignment tax capability degradation.Job description
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