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Senior AI Engineer – Pre-training Data (f/m/d)

Aleph Alpha is seeking a Senior AI Engineer to work across the full data-preparation lifecycle for foundation-model pre-training. The role covers sourcing and acquiring data, processing and filtering large corpora, improving data quality, a

In inglese

Company

Aleph Alpha

Location

Heidelberg, Germany

Status

Closed

Posted

2026-09-24T03:35:55.509+00:00

Aleph Alpha is hiring a senior engineer to own the data side of foundation-model pre-training, from sourcing and cleaning corpora to deduplication, filtering, decontamination and quality checks, plus deciding how datasets are mixed. The work spans data engineering, machine learning and pipeline infrastructure, with classifier-based filtering, perplexity-based selection and crawl processing. The posting asks for large-scale ML data experience and values Kubernetes, Rust and an NLP background; the role is Heidelberg-based, hybrid, and requires relocation or regular travel, with German helping on German-language data assessment.