Senior ML Engineer, Multilingual Speech & LLM Data

Propio; Overland Park (KS); Hybrid; USD 120,000 - 190,000; Full time

Job summary

Propio Language Services is hiring a Senior Machine Learning Engineer, Speech & LLM Training Data to transform multilingual conversational audio into high-quality training datasets. This hands-on role owns audio processing, dataset curation, annotation and QA workflows, model training, and evaluation for multilingual speech, translation, and conversational AI systems.

The position covers data roadmap, audio pipelines (VAD, diarization, ASR), dataset versioning, and secure, reproducible ML

Qualifications

• Bachelor’s or Master’s degree in Computer Science, ML, Data Science, Electrical Engineering, or related field, or equivalent practical experience.
• 5+ years of experience in ML engineering, speech/audio ML, ML data engineering, NLP, or LLM training-data workflows.
• Strong hands-on experience with Python, SQL, Linux, Git, and Docker.
• Experience training or evaluating models using PyTorch, Hugging Face, or comparable ML frameworks.
• Experience with FFmpeg and audio-processing libraries.
• Experience with speech-processing tasks such as VAD, diarization, ASR, language identification, and audio-quality analysis.

Responsibilities

• Define the data roadmap for multilingual speech, translation, multimodal LLMs, and conversational AI.
• Build audio-processing pipelines covering resampling, channel handling, VAD, diarization, language identification, transcription, alignment, and quality filtering.
• Build dataset pipelines for cleaning, deduplication, PII/PHI redaction, quality scoring, sampling, balancing, versioning, and lineage.
• Design annotation guidelines, QA rubrics, golden datasets, and reviewer workflows.
• Build evaluation datasets, analyze model failures, and translate performance gaps into targeted data improvements.
• Run training, fine-tuning, post-training, and evaluation experiments, including SFT, preference data, DPO/RLHF-style workflows, and synthetic data generation.
• Productionize secure, traceable, and reproducible data and ML workflows on AWS.

Skills

Python

SQL

Linux

Docker

PyTorch

Hugging Face

Git

NLP

Education

Bachelor’s or Master’s degree in Computer Science, ML, Data Science, EE, or related field

Tools

FFmpeg

torchaudio

librosa

TorchCodec

Label Studio

Databricks/Spark

Job description

Propio Language Services is hiring a Senior Machine Learning Engineer, Speech & LLM Training Data to transform multilingual conversational audio into high-quality training datasets. This hands-on role owns audio processing, dataset curation, annotation and QA workflows, model training, and evaluation for multilingual speech, translation, and conversational AI systems.

The position covers data roadmap, audio pipelines (VAD, diarization, ASR), dataset versioning, and secure, reproducible ML