Kiefer
Open positions
ML Engineer — ASR
ML Engineer improving automatic speech recognition for Kiefer's Sophea Meet: training/fine-tuning ASR models on real meeting audio, building benchmarks and error analysis, and improving production inference (accuracy, latency, cost). Core stack is Python with PyTorch/JAX/TensorFlow; English first, Greek next.
ML Engineer — Agents & LLMs
ML engineer improving the agent and long-context LLM capabilities behind Kiefer's AI products: runs post-training experiments (SFT, preference optimization, RL), builds benchmarks and verifiers for multi-step agents, curates training data, and hardens inference for production. Core stack is Python with PyTorch/JAX/TensorFlow.
MLOps Engineer
Builds the ML infrastructure at KIEFER (Athens) powering Sophea AI, a RAG platform, robotics, and the Hyperion X energy trading platform: training/fine-tuning pipelines, dataset and model versioning, automated evaluation, deployment with rollout/rollback, GPU scheduling, and production monitoring. Core stack: Python, Linux, containers, CI/CD, GPU tooling.