Case Studies Accessibility / Media
Accessibility technology provider
Real-time accessibility captioning
Core platform for FCC-approved ADA live captions on assisted calls—multi-lingual ASR, human-assisted / human-reviewed captioning, SIP trunking (Asterisk), Kamailio, homegrown WebRTC, E911 and messaging, plus new APIs and identity infrastructure.
Apache Kafka · Apache Flink · Kubernetes · Asterisk · Kamailio · WebRTC · Java · Scala · Akka · Play Framework
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Customer
An accessibility technology provider delivering live captions for assisted calls—an FCC-approved solution under the ADA. Latency and correctness are the product.
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Challenge
Live assisted-call captioning brings media and telephony pain—jitter, failover, session affinity, emergency routing—and a non-negotiable human outcome. Late or wrong captions break the promise to users who depend on them.
They needed a modernized core: speech, captioning modes, call bridging, emergency services, and API/identity infrastructure as one product—not bolted-on pieces.
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Work
Owned core platform build-out as product engineering and modernization.
- Bespoke multi-lingual ASR models for transcription
- Real-time captioning with human-assisted / human-reviewed mode
- Telephony / VoIP for call bridges: SIP trunking (Asterisk), Kamailio, and a homegrown WebRTC stack
- E911 and emergency services, plus messaging
- New APIs on Java, Scala, Akka, and Play Framework
- Identity and API infrastructure
Kafka, Flink, and Kubernetes where session-scale caption delivery required it.
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Impact
- FCC-approved ADA live captioning for assisted calls on a modernized core platform
- Multi-lingual ASR with human-assisted / human-reviewed real-time captioning
- Call-bridge stack: Asterisk SIP trunking, Kamailio, homegrown WebRTC; E911 and messaging
- New Java/Scala/Akka/Play APIs with identity & API infrastructure
