Sanas
Mobile App Engineer
SanasUnited States11 hours ago
Full-timeEngineering, Information Technology
Sanas.ai 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 transformation platform capable of accent translation, noise elimination, speech enhancement, and cross-language communication.

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.

Since going to market in 2023, Sanas has scaled at an extraordinary pace, growing from $0 to $32M ARR in under two years, with a projected >$50M ARR by the end of 2025. The company recently recorded its first $10M quarter and is on track to achieve $120M in ARR next year. With a SaaS-based model, Sanas serves some of the world’s largest enterprises, including Comcast, UPS, UHG. Today, Sanas technology is deployed across >17 of the Fortune 500 and continuing to accelerate growth.

The company’s valuation has a clear trajectory toward multi-billion-dollar market capitalization as it continues to expand into new verticals and product categories. With a TAM that spans all human in the loop communications and beyond, Sanas has the potential to impact every industry and every global interaction.

Sanas is revolutionizing the way we communicate with the world’s first real-time algorithm, designed to modulate accents, eliminate background noises, and magnify speech clarity. Pioneered by seasoned startup founders with a proven track record of creating and steering multiple unicorn companies, our groundbreaking GDP-shifting technology sets a gold standard.

Sanas is a 200-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.

We’re looking for a hands-on Senior Mobile App Engineer to lead development of our React Native application that delivers near real-time, voice-to-voice translation. You’ll own core client features—from FaceTime-like calling and live captioning to buttery-smooth UI animations—and collaborate closely with our speech/ML, product, and backend teams to ship a high-quality, low-latency experience. Experience with React Native is required; with knowledge writing and Kotlin plugins a strong plus. AV experience is a plus.

What You’ll Do:

  • Build major app features:
  • Own major product surfaces within audio/video calling, onboarding, growth features, etc
  • Implement native-quality UX in React Native with high-polish animations and transitions
  • Real-time media & low latency:
  • Integrate with our real-time translation backend and media pipelines
  • Work with (or introduce) WebRTC for A/V calls; handle audio routing,
  • interruptions, and seamless crossfades from original to translated audio
  • Performance, reliability, and quality:
  • Optimise startup time, frame budget, memory, and jank
  • Instrument crash/error reporting; build resilience for poor networks and backgrounding
  • Instrumentation & growth:
  • Add analytics, deep-links, and attribution (e.g., PostHog, Branch or equivalents)
  • Support A/B experiments, onboarding flows, notifications, and “call non-users” funnels
  • Platform collaboration:
  • Bridge native modules (Swift/Obj-C; Kotlin/Java) when RN needs deeper platform access (for example, writing callkit plugin)
  • Partner with ML/infra teams on streaming APIs, caption timing, and voice pipelines
  • Security, accessibility, and internationalisation:
  • Implement privacy-first features, localisation/i18n, and accessible UI




Must-Have Qualifications:

  • 5+ years building and shipping consumer-grade mobile apps; 3+ years with React Native and TypeScript
  • Demonstrated ownership of a major app or feature used by real customers (App Store/Play Store)
  • Strong UI/UX instincts with React Native animations (e.g., Reanimated,Gesture Handler; familiarity with Lottie or Skia is a plus)
  • Experience integrating real-time or streaming features (sockets, media, or similar)
  • Comfortable bridging to native: Swift/Objective-C (Kotlin/Java a plus)
  • Fluency with mobile CI/CD, OTA updates (e.g., CodePush/EAS), crash reporting, and performance tooling
  • Excellent product judgment, collaboration, and communication; thrive in fast-paced, in-person startup environment




Preferred Experience:

  • WebRTC (or VoIP stacks) for audio/video calling; familiarity with CallKit/PushKit (iOS) or ConnectionService/FCM (Android)
  • iOS audio/video frameworks (AVFoundation, AVAudioSession, audio mixing/crossfades)
  • Android media (AudioTrack/ExoPlayer), and/or Kotlin for parity features
  • Live captions, speech recognition, or audio UX on mobile
  • Analytics/attribution (PostHog, Branch or alternatives), deep linking, and growth experiments
  • Localization/i18n, accessibility, and app security best practices
  • Start-to-finish launch experience for a high-quality B2C app




Joining us means contributing to the world’s first real-time speech understanding platform revolutionizing Contact Centers and Enterprises alike.

Our technology empowers agents, transforms customer experiences, and drives measurable growth. But this is just the beginning. You'll be part of a team exploring the vast potential of an increasingly sonic future

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