VoIP & AI Platform Engineer

Contour Software

Islamabad

On-site

PKR 2,000,000 - 4,000,000

Full time

14 days+

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Benefits offered by this job

Medical Coverage – Self & Dependents

Provident Fund

Performance-based bonuses

Lunch/Dinner provisions

Job summary

Contour Software is hiring for a senior VoIP engineer to design, build, and support carrier-grade VoIP platforms and AI voice agents. You will work hands-on with Asterisk, FreeSWITCH, Kamailio, OpenSIPS, NetSapiens, Bandwidth, and Twilio, developing backend services in Python and integrating with CRM systems and calendars.

You will configure dial plans, IVRs, and SIP routing while ensuring security, scalability, and disaster recovery.

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 centres, 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, customise, 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 signalling, audio, registration, NAT, codec, latency, jitter, packet loss, webhook, and carrier-interoperability issues.
Analyse 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, unauthorised 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.