Telephony Infrastructure & ESL Integration

• Implemented a full call lifecycle event pipeline (channel create, answer, bridge, hold/unhold, hangup) with dynamic routing, multi-modal outbound campaign modes, and IVRs.
• Added real-time call monitoring capability via eavesdrop and intercept.

Distributed Process Management

• Designed a dynamic supervisor management component in Elixir and Horde to execute API commands and manage inbound sessions across instances.
• Handled process registration and failover across distributed nodes.

Reliable Data Sync & Background Workers

• Built serial-order background sync pipelines with Oban and retry semantics to propagate state changes to FreeSWITCH.
• Created background workers for scheduled reporting, automated resource recovery, and cleanup tasks.

CDR & Survey Analytics Engine

• Implemented event-sourced multi-leg call detail record (CDR) tracking to calculate talk, hold, and queue times across transfers.
• Paired tracking engines with per-call survey engines and analytics APIs.

Core API & Platform Security

• Designed multi-tenant RESTful APIs featuring complex query filtering, schema validations, and database migrations.
• Integrated Keycloak for authentication and session management.