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Sanas is pioneering the future of human communication. Founded by a team of Stanford researchers and entrepreneurs with deep industry experience, Sanas has developed the world's first real-time speech AI platform capable of accent translation, noise cancellation, speech enhancement, cross-language communication, and more.
Sanas makes conversations clearer, more inclusive, and more effective, removing barriers that prevent people from being understood, regardless of accent, background noise, or native language.
Sanas is currently one of the fastest growing startups in Silicon Valley, growing from $16M to $50M ARR in 2025. The company's core business is profitable and is on track to end 2026 with >$120M ARR. Our team combines deep expertise in model innovation and systems engineering with a design-minded product engineering culture to build and ship cutting-edge AI models and experiences - entirely in-house.
Sanas is a 180-strong team, established in 2020. In this short span, we've successfully secured over $100 million in funding. Our innovation has been supported by the industry's leading investors, including Insight Partners, Google Ventures, Quadrille Capital, General Catalyst, Quiet Capital, and other influential investors. Our reputation is further solidified by collaborations with numerous Fortune 100 companies. With Sanas, you're not just adopting a product; you're investing in the future of communication.
If you're looking to have a significant role in roadmapping and driving technical directions, if you're looking to deploy challenging and big ideas without much overhead or slowness, if you're looking to leave your mark on an ambitious, generational mission to change how the worlds thinks about speech + AI, then Sanas is a well-suited place for you.
About Sanas
Sanas is pioneering the future of human communication. Founded by a team of Stanford researchers and entrepreneurs with deep industry experience, Sanas has developed the world's first real-time speech AI platform capable of accent translation, noise cancellation, speech enhancement, cross-language communication, and more.
Sanas makes conversations clearer, more inclusive, and more effective, removing barriers that prevent people from being understood, regardless of accent, background noise, or native language.
Sanas is currently one of the fastest growing startups in Silicon Valley, growing from $16M to $50M ARR in 2025. The company's core business is profitable and is on track to end 2026 with >$120M ARR. Our team combines deep expertise in model innovation and systems engineering with a design-minded product engineering culture to build and ship cutting-edge AI models and experiences - entirely in-house.
Sanas is a 180-strong team, established in 2020. In this short span, we've successfully secured over $100 million in funding. Our innovation has been supported by the industry's leading investors, including Insight Partners, Google Ventures, Quadrille Capital, General Catalyst, Quiet Capital, and other influential investors. Our reputation is further solidified by collaborations with numerous Fortune 100 companies. With Sanas, you're not just adopting a product; you're investing in the future of communication.
If you're looking to have a significant role in roadmapping and driving technical directions, if you're looking to deploy challenging and big ideas without much overhead or slowness, if you're looking to leave your mark on an ambitious, generational mission to change how the worlds thinks about speech + AI, then Sanas is a well-suited place for you.
About the Role
Your mission is to build and operate the ingestion systems that turn the open web and large-scale audio sources into reliable, well-structured corpora for training Sanas's frontier speech models. You'll own the machinery that acquires, extracts, filters, versions, and delivers audio data to our training pipelines - and you'll work directly with our research scientists to close the loop between what we collect and how it moves model quality.
Job Description
Data acquisition & ingestion

• Own and lead engineering projects across the full data acquisition stack - web crawling, audio ingestion, source discovery, and dataset delivery to training pipelines.
• Build and operate large-scale distributed crawling infrastructure capable of continuously discovering and ingesting audio at scale across languages, accents, domains, and recording environments.
• Develop specialized crawlers for high-priority audio sources with source-specific extraction and normalization logic.
• Run experiments to evaluate crawling strategies, extraction methods, and ingestion tradeoffs; analyze results to identify gaps, redundancy, and coverage improvements across speaker demographics and language pairs.
• Build ingestion pipelines that scale reliably across large data campaigns, with automated audio quality filtering - SNR estimation, clipping detection, codec artifact identification - as a first-class pipeline stage.

Systems & infrastructure

• Design and deploy highly scalable distributed systems capable of handling petabytes of audio data - from raw acquisition through quality filtering, deduplication, segmentation, and versioned dataset generation.
• Architect and implement indexing and search capabilities over large audio corpora - enabling fast lookup by language, speaker, acoustic condition, duration, and quality tier.
• Build and maintain backend services for data storage, including key-value databases, metadata synchronization, and manifest management across dataset versions.
• Deploy and operate acquisition infrastructure in a Kubernetes / Infrastructure-as-Code environment; perform routine system health checks and respond to production issues quickly.
• Collaborate closely with data processing, architecture, and ML platform teams to ensure smooth data flow from acquisition through to training-ready outputs.

Compliance & data governance

• Work closely with legal to handle compliance, data privacy, and licensing matters across all acquisition sources - maintaining a clear audit trail of provenance, permitted use, and commercial training rights for every dataset.
• Enforce speaker consent documentation, GDPR requirements, robots.txt and ToS adherence, and audio retention policies across all ingestion pipelines.
• Manage relationships with third-party data vendors - writing precise acquisition briefs, evaluating quality on delivery, and ensuring sourced data meets Sanas's licensing and quality standards.

Qualifications

• 4+ years of experience in data engineering, ML data infrastructure, or backend systems engineering - with direct experience building large-scale data ingestion or crawling systems.
• Strong Python and systems engineering skills - you build robust, maintainable infrastructure, not just one-off scripts.
• Hands-on experience with distributed systems design: you've built systems that handle failure gracefully, scale horizontally, and recover cleanly.
• Experience with web crawling infrastructure at scale including handling rate limiting, deduplication, and content extraction.
• Proficiency with cloud platforms (AWS or GCP), object storage (S3/GCS), and container orchestration (Kubernetes).
• Comfort working with audio processing tooling - ffmpeg, librosa, torchaudio, sox - and experience handling large volumes of audio files.
• Strong data quality instincts: you instrument pipelines, surface issues proactively, and treat data correctness with the same rigor as software correctness.

Bonus

• Experience building speech or audio datasets for ASR, TTS, speech enhancement, or speaker verification model training.
• Familiarity with major open speech corpora - Common Voice, LibriSpeech, VoxPopuli, AISHELL - and their sourcing and quality characteristics.
• Experience with data versioning tools.
• Background in multilingual or low-resource language data collection.
• Experience with annotation and labeling platforms.
• Familiarity with speaker diarization, language identification, or automated audio quality estimation models used for data filtering at scale.