Senior AI Researcher: LLM post-training for hallucination reduction (f/m/d)

Heidelberg · Remotefull time

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senior

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Alephalpha Senior AI Researcher role focused on LLM post-training to reduce hallucinations using SFT and RL techniques. Responsible for designing and scaling post-training methodologies and building distributed fine-tuning pipelines on multi-node GPU clusters.

Responsibilities

We are looking for a (Senior) AI Researcher to join our hallucination reduction capability team to push the boundaries in LLM post-training (SFT and RL).
We're one of the few places in Europe training foundation models from scratch. You will be part of a team of (senior) researchers and PhD interns doing cutting-edge research across pre-, mid- and post-training, grounding and specialized models with hundreds of GPUs at our disposal.
What will you do
Core Research & Development: Design, execute, and scale post-training methodologies (SFT, RL) specifically aimed at eliminating model hallucinations and making them grounded in evidence.
Uncertainty & Reliability: Research and implement techniques in uncertainty estimation, calibration, self-consistency, and self-correction mechanisms to enable models to identify and signal when they “don't know”.
Post-Training Pipelines: Build and optimize high-throughput, distributed fine-tuning and training pipelines across multi-node GPU clusters.
Evaluation & Benchmarking: Design and implement rigorous evaluation methods to benchmark hallucination rates, truthfulness, and reasoning accuracy.
Technical Ownership: Drive research projects independently from initial hypothesis to scalable production implementation and technical reports.

Qualification

Uncertainty estimation

Required

Hands-on experience fine-tuning or post-training LLMs using modern distributed training frameworks.
Track record of research or implementation in at least one of the following domains:
Hallucination mitigation / truthfulness alignment / grounding in RAG
Uncertainty estimation, or out-of-distribution detection
Retrieval-Augmented Generation evaluation / alignment, refusal behavior calibration, or claim verification
Strong programming skills (Python & PyTorch).

Benefits

Wellness

Company

Alephalpha

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Source: ashby

Active within the past hour

Remote-friendly

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Must-Have Skills for This Role

LLMSFTRLPythonPyTorchdistributed training frameworks

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Senior AI Researcher: LLM post-training for hallucination reduction (f/m/d) at Alephalpha · LumiJobs