Senior AI Researcher: LLM post-training for hallucination reduction (f/m/d)
Level inferred from job title
Job description
A (Senior) AI Researcher role on the hallucination reduction capability team, focused on advancing LLM post-training (SFT and RL) to make models grounded and reliable. The position involves cutting-edge research across pre-, mid- and post-training with hundreds of GPUs available.
At a glance
- Work mode
- Hybrid
What you'll do
- Design, execute, and scale post-training methodologies (SFT, RL) specifically aimed at eliminating model hallucinations and making them grounded in evidence
- 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"
- Build and optimize high-throughput, distributed fine-tuning and training pipelines across multi-node GPU clusters
- Design and implement rigorous evaluation methods to benchmark hallucination rates, truthfulness, and reasoning accuracy
- Drive research projects independently from initial hypothesis to scalable production implementation and technical reports
What we're looking for
- 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)
Your team
hallucination reduction capability team
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 their disposal.
Benefits
- 30 days of paid vacation
- Access to a variety of fitness & wellness offerings via Wellhub
- Mental health support through nilo.health
- Substantially subsidized company pension plan for your future security
- Subsidized Germany-wide transportation ticket
- Budget for additional technical equipment
- Flexible working hours for better work-life balance and hybrid working model
- JobRad® Bike Lease
Apply
Direct apply at Alephalpha
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About Aleph Alpha
Aleph Alpha delivers category-defining AI innovation that enables open, accessible, and trustworthy deployment of GenAI in industrial applications. The organization develops foundational models and next-generation methods that make it easy and affordable for customers to increase productivity in development, engineering, logistics, and manufacturing processes.
Mission
To deliver sovereign, human-centric AI to governmental institutions and large enterprises.
Key facts
- One of the few places in Europe training foundation models from scratch
- Has hundreds of GPUs at its disposal
What they value
- Sovereign, human-centric AI
- Open, accessible, and trustworthy deployment of GenAI