VoIP & Telecom Developer

VoIP & Telecom Developer

Company:

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 (Node.js/Python) 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 (extensions.conf/AEL/Lua), 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:

  Node.js 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

equivalent hands-on Asterisk/Vicibox/SIP experience outweighs certificates.