Senior Machine Learning Engineer, Speech & LLM Training Data

Senior Machine Learning Engineer, Speech & LLM Training Data Own Your Impact. At Propio , we don't believe careers happen to people. We believe people create them.

Here, you're trusted to make decisions, challenge assumptions, drive innovation, and shape outcomes. Your success is not limited by hierarchy or tenure. It's fueled by your ambition, your curiosity, and your willingness to own your impact.

If you're looking for a role where you can simply maintain the status quo, this probably isn't it, but if you're looking for a place where your ideas matter, your growth is accelerated, and your work creates meaningful impact across the world, we'd love to talk. Why Propio? Every day, communication changes lives.

A patient receives care they otherwise couldn't access. A family gains critical information. A business connects with a customer.

A community becomes more inclusive. These moments happen because barriers are removed. And behind those moments are Propio team members who show up every day to solve problems, innovate, and build the future.

This isn't just work. This is world impact. As a Senior Machine Learning Engineer, Speech & LLM Training Data , you'll have the opportunity to make a meaningful contribution to the continued growth and transformation of Propio.

You will transform large volumes of multilingual conversational audio into high-quality training and evaluation datasets. This hands-on role owns audio processing, dataset curation, annotation and QA workflows, model training, and evaluation for our multilingual speech, translation, and conversational AI systems. You'll Be Empowered To Take ownership of important initiatives and outcomes.

Drive meaningful business results. Influence decisions and contribute new ideas. Partner with talented, high-performing team members.

Challenge yourself through continuous learning and growth. Help shape the future of a rapidly growing organization. What You'll Own 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.

What Makes Someone Successful Here The most successful people at Propio aren't necessarily the ones with the longest resumes. They're the people who: Take ownership instead of waiting for direction. Embrace challenges as opportunities to grow.

Continuously seek better ways of working. Turn ideas into action. Hold themselves and others accountable to high standards.

Are driven by making a measurable impact.