VoIP & AI Communications Architect

EWS Group; Pakistan; On-site; PKR 1,800,000 - 3,600,000; Full time

Benefits offered by this job

Market-leading salary

Health insurance

Provident Fund

Performance bonuses

Home internet subsidy

Job summary

Contour Contour Software is expanding its global Centre in Pakistan, delivering VoIP platforms and AI voice agents. The role involves designing, building, and supporting scalable VoIP solutions using Asterisk, FreeSWITCH, Kamailio/OpenSIPS, NetSapiens, Bandwidth, and Twilio, with strong Python development.

The team collaborates across functions to integrate with CRM, calendars, contact centres, and business apps, while ensuring reliability, security, and high availability.

Qualifications

• Professional experience developing or supporting production VoIP platforms.
• Hands-on knowledge of Asterisk, FreeSWITCH, Kamailio, OpenSIPS, and NetSapiens.
• Experience integrating Bandwidth and Twilio APIs, SIP trunks, webhooks, telephone-number services, and programmable communications.
• Strong Python development experience, including backend services, APIs, integrations, testing, and automation.
• Strong understanding of SIP, SDP, RTP, RTCP, DTMF, codecs, and call-state management.
• Experience developing dial plans and complex inbound and outbound call-routing logic.
• Knowledge of SIP registration, authentication, trunks, number normalization, least-cost routing, and failover.
• Understanding of AI voice-agent architecture, including speech recognition, speech synthesis, language models, conversation state, and tool calling.
• Experience integrating APIs, webhooks, databases, and third-party business systems.
• Strong understanding of TCP/IP, UDP, DNS, NAT, TLS, WebSockets, firewalls, and load balancing.
• Familiarity with MySQL, MariaDB, PostgreSQL, or comparable relational databases.
• Linux administration, Git, automated testing, CI/CD, and command-line troubleshooting experience.
• Ability to diagnose complex VoIP and AI call-flow issues using logs, traces, metrics, and packet captures.
• Strong analytical, documentation, collaboration, and communication skills.

Responsibilities

• Design, develop, deploy, and maintain scalable VoIP applications and services.
• Build backend services, REST APIs, integrations, and automation tools using Python.
• Develop AI voice agents and virtual receptionist solutions that answer calls, route callers, schedule appointments, respond to questions, and handle common customer requests.
• Integrate speech-to-text, text-to-speech, natural-language processing, and large language models with real-time VoIP systems.
• Connect AI agents with SIP trunks, PBX platforms, CRM systems, calendars, contact centers, and business applications, including reliable escalation and transfer to human representatives.
• Configure Asterisk and FreeSWITCH dial plans, IVRs, queues, voicemail, conferencing, recording, and complex call flows.
• Develop and maintain Kamailio and OpenSIPS configurations for SIP proxying, registration, authentication, routing, load balancing, failover, and security.
• Administer, customize, and integrate NetSapiens domains, users, devices, call-routing rules, provisioning workflows, and APIs.
• Integrate and manage Bandwidth and Twilio services for SIP trunking, programmable voice, messaging, telephone numbers, call routing, and emergency calling.
• Develop applications using Bandwidth and Twilio APIs, SDKs, webhooks, and programmable communications services.
• Integrate SIP carriers, session border controllers, gateways, PBX platforms, and third‑party communications services.
• Build provisioning, billing, reporting, monitoring, messaging, and telephone‑number management integrations.
• Build or enhance web‑based administration, monitoring, and reporting interfaces; React experience is an asset.
• Troubleshoot signaling, audio, registration, NAT, codec, latency, jitter, packet loss, webhook, and carrier‑interoperability issues.
• Analyze SIP and RTP traffic using sngrep, Wireshark, Homer, logs, metrics, and packet captures.
• Improve availability, voice quality, scalability, security, and disaster‑recovery capabilities.
• Protect systems against toll fraud, SIP scanning, denial‑of‑service attacks, prompt injection, unauthorized access, and improper handling of customer data.
• Create technical documentation, deployment procedures, diagrams, and operational runbooks; participate in testing, releases, incident response, and on‑call support.

Skills

Python development

Analytical skills

Documentation

Communication

React experience

Tools

Asterisk

FreeSWITCH

Kamailio

OpenSIPS

NetSapiens

Bandwidth/Twilio APIs

SIP trunks

Webhooks

Docker

Kubernetes

MySQL/MariaDB/PostgreSQL

Linux

Git

CI/CD

Job description

Contour Contour Software is expanding its global Centre in Pakistan, delivering VoIP platforms and AI voice agents. The role involves designing, building, and supporting scalable VoIP solutions using Asterisk, FreeSWITCH, Kamailio/OpenSIPS, NetSapiens, Bandwidth, and Twilio, with strong Python development.

The team collaborates across functions to integrate with CRM, calendars, contact centres, and business apps, while ensuring reliability, security, and high availability.