Kamailio (VOIP) Engineer

WE ARE HIRING | PROJECT MANAGER – VOIP TECHNOLOGIES

Position: Project Manager

Industry: IT Services / VoIP Technologies

Experience: 6–12 Years

Location: Ahmedabad | Work from Office

We are looking for a Technical Project Manager with a strong hands-on technical background in VoIP Development

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KEY RESPONSIBILITIES

• Manage end-to-end VoIP implementation projects from initiation through deployment and post-implementation support.

• Gather business and technical requirements and translate them into actionable project plans.

• Prepare project schedules, milestones and resource allocation plans.

• Coordinate with Development, QA, DevOps, Support and Infrastructure teams.

• Track project progress and ensure timely delivery.

• Conduct project kickoffs, status meetings and client review meetings.

• Identify project risks and develop mitigation strategies.

• Manage scope changes and maintain project documentation, reports and dashboards.

• Coordinate UAT and production rollout.

• Manage timelines, budgets and resource utilisation.

• Communicate project status to clients and internal stakeholders.

• Support pre-sales through effort estimation and project planning.

MANDATORY TECHNICAL EXPERIENCE

Hands-on experience in VoIP/Telecom with strong knowledge of:

• FreeSWITCH

• Asterisk

• Kamailio

• OpenSIPS

• SIP

• RTP

• WebRTC

• SBC

• IP Telephony

• Linux

• TCP/IP, NAT, Firewalls and Networking

ADDITIONAL SKILLS

• Agile / Scrum methodologies

• Project planning and scheduling

• Risk and resource management

• Client and stakeholder management

• UAT and production deployment

• Vendor coordination

• International client handling

• AWS / Azure / GCP exposure is an advantage

• REST API integration knowledge is an advantage

• PMP / PRINCE2 / CSM certification preferred

We’re building a powerful, AI-driven communication platform — a next-generation alternative to RingCentral or 8x8 — powered by OpenAI, LangChain, and SIP/WebRTC. We're looking for a Full-Stack Software Developer who’s passionate about building real-time, AI-enabled voice infrastructure and who’s excited to work in a fast-moving, founder-led environment.

This is an opportunity to build from scratch, take ownership of core systems, and innovate on the edge of VoIP + AI.

What You’ll Do

• Design and build AI-driven voice and messaging features (e.g. smart IVRs, call transcription, virtual agents)
• Develop backend services using Python, Node.js, or Golang
• Integrate OpenAI, Whisper, and LangChain with real-time VoIP systems like Twilio, SIP, or WebRTC
• Create scalable APIs, handle call logic, and build AI pipelines
• Collaborate with the founder and early team on product strategy and infrastructure
• Participate in occasional in-person strategy meetings (Delhi, Bangalore, or nearby)

Must-Have Skills

• Strong programming experience in Python, Node.js, or Go
• Hands-on experience with VoIP/SIP, WebRTC, or tools like Twilio, Asterisk, Plivo
• Experience integrating with LLM APIs, OpenAI, or speech-to-text models
• Solid understanding of backend design, Docker, Redis, PostgreSQL
• Ability to work independently and deliver production-grade code

Nice to Have

• Familiarity with LangChain or agent-based AI systems
• Knowledge of call routing logic, STUN/TURN, or media servers (e.g. FreeSWITCH)
• Interest in building scalable cloud-first SaaS products

Work Setup

• 🏠 Remote work
• 🕐 Full-time role
• 💼 Direct collaboration with founder (technical)
• 🧘‍♂️ Flexible hours, strong ownership culture

Key Responsibilities

• Design, configure, administer, and troubleshoot Cisco Voice and Collaboration environments.
• Hands-on experience with Cisco CUCM (Call Manager) administration, configuration, upgrades, and troubleshooting.
• Manage and support Cisco Unity Connection for voicemail and unified messaging.
• Configure and troubleshoot Ribbon SBC / PSX for SIP signaling, call routing, and voice connectivity.
• Troubleshoot SIP, RTP, TCP/IP, DNS, and voice call-flow issues.
• Configure and maintain Cisco IP Phones, gateways, trunks, dial plans, route patterns, translation patterns, and partitions/CSS.
• Monitor voice infrastructure and resolve incidents, service requests, and performance issues.
• Perform voice platform upgrades, patching, migrations, and production changes.
• Work with network, security, and application teams to resolve complex voice and connectivity issues.
• Maintain technical documentation, configuration standards, and operational procedures.

Required Skills

• Strong experience in Cisco Voice / Collaboration technologies.
• Cisco CUCM – Administration and troubleshooting.
• Cisco Unity Connection – Administration and troubleshooting.
• Ribbon SBC / PSX – Configuration and troubleshooting.
• Strong knowledge of SIP, RTP, VoIP, TCP/IP, DNS, and networking fundamentals.
• Experience with SIP Trunks, dial plans, gateways, route patterns, and call routing.
• Good troubleshooting and incident management skills.
• Exposure to monitoring tools and ITIL-based support processes is an added advantage.

Procedure is hiring for WorkHero.

WorkHero is building the AI-powered back office for the skilled trades, starting with the $50B+ HVAC industry. Small contractors are great at their trade but lose 20+ hours a week to invoicing, permits, scheduling, and paperwork. WorkHero combines expert office managers with automation and AI tooling, enabling a small team to take real ownership of that back-office work

We’re hiring a senior engineer to own our real-time voice stack end to end—AI agents operating on live phone calls—and the data platform that turns those calls into insight: call → transcript → events → warehouse → dashboards. You’ll own meaningful systems end to end alongside a small, senior team with deep experience in AI, product, and the trades.

What you’ll build

• New product screens and flows (jobs, customers, invoices, scheduling) in React and React Native, especially AI chat UI (chat & tool result rendering, streaming responses, human review and feedback loops)
• AI workflows in production: tool-using agents, RAG/search, classification/extraction, and human-in-the-loop flows
• Automations: Contribute new features and improvements to our AI-powered business automation platform

In addition, you’ll own our first investments into a realtime voice stack and the call-data platform behind it. For example:

• Realtime voice agents on live phone calls: telephony/WebRTC integration, streaming speech-to-text and text-to-speech, turn-taking, interruption handling, and latency optimization
• Voice pipeline reliability: backpressure, failover, graceful degradation, and monitoring for live calls
• Call-data pipeline: transcripts, events, and structured extraction flowing from every call into the warehouse
• Analytics & dashboards: data modeling and conversation-intelligence features on top of call data
• Evals & monitoring for voice agents: quality metrics, drift detection, and cost/latency tracking
• Cloud infrastructure: scaling our platform with infrastructure as code, queues and orchestration, and CI/CD

Responsibilities

• Analyze requirements and propose innovative AI-native solutions to technical problems
• Write clean scalable code
• Own the voice and data stack end-to-end: design, build, test, deploy, and operate
• Optimize the performance, latency, and cost of our real-time AI systems
• Respond to critical system issues and ensure continuous system reliability
• Mentor team members and collaborate across teams, especially with product and subject matter experts
• Work to understand the needs of our users and think creatively about how to solve design challenges in your work
• This is a Remote role. We expect a minimum 4 hours overlap with the WorkHero team (11 AM - 3 PM ET).

Qualifications

• Senior-level backend experience (typically 5+ years) shipping production systems that you've owned
• Hands-on experience with realtime voice or streaming systems: telephony (SIP/Twilio), WebRTC, streaming STT/TTS, or frameworks like LiveKit or Pipecat — or comparable experience with demanding realtime/streaming infrastructure
• Data engineering fundamentals: event pipelines, data modeling, warehousing, and analytics on production data
• Strong proficiency in a typed backend language (TypeScript preferred; comparable experience welcome)
• Hands-on experience with LLM-powered features (usage, prompting, optimization, etc) and AI architectures
• The ability to work with infrastructure as code (terraform), cloud, and CI/CD systems at scale. We're a small team, so we own the whole stack!
• Excitement to leverage AI coding tools to their maximum benefit. We love Claude Code and Cursor and are constantly looking for better ways to leverage our time to build fast and build for scale.

Nice to have

• experience with voice-AI platforms (Vapi, Retell, Bland, Deepgram, LiveKit) or conversation-intelligence products (e.g. Gong-style analytics)
• experience scaling cloud infrastructure, especially AWS, and how to get the most out of key AWS services
• experience with workflow automation tools like n8n or Lindy
• experience with React for building internal dashboards
• experience with HVAC or back-office business workflows

WorkHero is committed to building a diverse team. We encourage candidates from all backgrounds to apply.