Case study (NDA-safe)

Real-time VoIP + live transcription (in-house)

Brought a mission-critical dependency in-house to control uptime and roadmap — while designing for security and real-time constraints.

Context

Accessibility / public-sector adjacent B2C product. Core system designed and delivered end-to-end.

Problem

The business depended on a third-party provider for call + transcript functionality. Provider outages and limitations created operational overhead and restricted the roadmap. The goal was a proof-of-concept for a new implementation with a 99% uptime target.

Solution

  • ◆Built a full stack: backend + web + Android + iOS supporting VoIP calls and real-time transcription.
  • ◆Real-time transcription streamed via WebSockets (low-latency UI updates).
  • ◆Integrations: Twilio (telephony) + Google STT (speech-to-text).
  • ◆Reliability + integrity: queues and data integrity validation.

Security & privacy

  • ◆End-to-end encryption for transcript content in transit between clients (web/mobile) and backend.
  • ◆No transcript persistence after the conversation finished (data minimization by design).
  • ◆Client held private key and shared public key with backend at connection time.

Outcome

The company brought a critical dependency in-house to control uptime and roadmap, improving reliability and reducing operational burden.