VoIP & Telecom Developer

2 weeks ago

Hyderabad, Telangana, India Universal Response Systems Full time ₹ 8,00,000 - ₹ 24,00,000 per year

VoIP & Telecom Developer (Asterisk/Vicibox/SIP)

Company: Universal Response Systems (URS)

Location: India (Remote)

Department: Engineering Software & QA Software Development

Employment Type: Full-Time, Permanent

Role Summary

URS is building a cloud-hosted, open-source telecom stack from scratch to replace third-party dialers. We need a hands-on VoIP & Dialer Engineer who can architect, build, and ship the entire platform end-to-end: Asterisk/Vicibox dialer, SIP edge, multi-carrier routing, SMS/RVM, APIs, observability, and security. You build it; we'll operate it day-to-day. Strong growth path to Technical Head as we scale.

What You'll Build & Own

  • Core dialer: Stand up Asterisk/Vicibox/Vicidial in the cloud; design dial-plans (IVR/queues/recordings), AMD/voicemail detection, RVM (with guardrails).
  • SIP edge & media: Deploy OpenSIPS/Kamailio (registrar/dispatcher/dialog), rtpengine/rtpproxy, TLS/SRTP, NAT traversal.
  • Carriers & routing: Integrate multi-carrier SIP, implement LCR, intelligent failover, and QoS monitoring (ASR/ACD/PDD/MOS).
  • Messaging: Build SMS/MMS via SMPP/REST (Twilio/Telnyx/Plivo/etc.) with DLR handling, throughput control, error normalization.
  • APIs & integrations: Ship internal REST/webhook services ) for CRM/dialer interop; signatures, retries, idempotency.
  • Cloud & automation: AWS/GCP/Azure provisioning, VPC/SGs, Terraform/Ansible/Docker (K8s nice), backups/restore, multi-AZ design.
  • Vicidial data layer: ETL and safe bulk ops across vicidial_list, vicidial_log, vicidial_agent_log, vicidial_closer_log, vicidial_campaigns, vicidial_statuses; MySQL/MariaDB tuning and index strategy for hot *_log tables.
  • Number health & LNP: Automate DID lifecycle, caller-ID reputation monitoring/remediation, CNAM, number porting (LNP) tooling and cutovers.
  • Observability & reliability: HOMER/siptrace, sngrep, Wireshark, SIPp probes, Grafana/ELK; SLOs, alerts, incident runbooks.
  • Security: TLS/SRTP, SBC ACLs, fail2ban, secrets/RBAC; partner on DNC/TCPA plumbing and policy.

Must-Have Skills

  • VoIP core: Asterisk/Vicibox/Vicidial; SIP/RTP/SDP; dial-plans ), IVR/queues/recordings.
  • SIP edge & media: OpenSIPS/Kamailio, rtpengine/rtpproxy, TLS/SRTP, NAT traversal.
  • Cloud & IaC: AWS/GCP/Azure + Terraform/Ansible; Docker (K8s nice).
  • Routing & QoS: Multi-carrier SIP, LCR, DNS SRV, QoS, codec tuning (G.711/G.729/Opus); KPI literacy (ASR/ACD/PDD/MOS).
  • Code & integrations: or Python, REST/webhooks, webhook security; Linux; MySQL/MariaDB.
  • Debugging: Wireshark, sngrep, SIPp; capacity/perf tuning for real-time systems.
  • Numbers: DID lifecycle, caller-ID reputation workflows, LNP/porting execution.

Nice-to-Have

  • Asterisk internals: ARI/AMI/AGI, optional C/C++ module work (gdb, valgrind/gprof).
  • WebRTC (STUN/TURN), softphone provisioning (Zoiper/Linphone).
  • OpenSIPS/Kamailio clustering, geo-routing, multi-region HA/DR.
  • Event streaming (Kafka/RabbitMQ); CDR analytics (ClickHouse/BigQuery); Grafana/ELK depth.
  • Exposure to 10DLC/STIR/SHAKEN, trust hubs (Numeracle/TCR), spam-label mitigation.

Education

B.E./B.Tech (CS/IT/ECE/Telecom) preferred — equivalent hands-on Asterisk/Vicibox/SIP experience outweighs certificates.

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