株式会社Recho
Open positions
Senior LLM Training Engineer (Post-training)
Senior engineer owning LLM post-training for Recho's voice AI agents: design and run SFT, preference optimization and online RL, including reward design, training-data quality and in-house evaluation. Stack: Python, PyTorch, verl/OpenRLHF/TRL, vLLM/SGLang, FSDP/DeepSpeed. Tokyo hybrid, English-speaking team.
Senior Speech AI Engineer (Speech Synthesis / TTS)
Senior engineer who improves the quality of the voice behind Recho's phone-based AI customer-support agents: training state-of-the-art TTS models (PyTorch, LLM-based TTS, audio codecs, flow matching, diffusion), owning speech data strategy and evaluation, and partnering on latency — with a path to leading the speech team.
Senior AI Inference Engineer (LLM & Speech Models)
A hands-on senior engineer who designs, builds, and optimizes Recho's inference framework for speech models (ASR/TTS/speech-to-speech) and LLMs, owning throughput and GPU cost. Day to day: tuning vLLM/SGLang inference, dynamic batching for variable-length audio, async pipelines, and GPU orchestration with Kubernetes, Slurm, and Ray using Python and PyTorch.
AI推論基盤エンジニア（シニア／LLM／音声モデル）
Senior AI inference infrastructure engineer at Recho (Tokyo, hybrid) who independently designs and implements the inference framework for voice AI models and LLMs, optimizing throughput and GPU cost with Python, PyTorch, vLLM/SGLang, and Kubernetes/Slurm/Ray. English is the team language; annual pay ¥10M–¥20M.
インフラ エンジニア / Infrastructure Engineer
インフラ エンジニア / Infrastructure Engineer 仕事概要 ## 役割：最先端の音声モデル推論基盤とマルチクラウド環境を統括し、AIの社会実装をインフラから支える **■お任せしたい主な業務** **1. セキュリティ・ネットワーク** - 大規模環境におけるネットワーク設計・権限管理の整備 - 金融業界水準のセキュリティ要件に対応するインフラ設計・脆弱性対応 **2. マルチクラウドの運用** - AWS…