Architect / CTO (VoIP project from scratch) Offline

We are looking for an Architect / CTO with deep experience in VoIP, ready to build the project from scratch, propose the technology stack, and assemble a team to successfully deliver the solution..

Project

We are developing a new manual VoIP switchboard system based on FreeSWITCH (FusionPBX) with a custom web interface for operators. The system will handle audio and video calls, support conferencing, CRM integration, logging, security, and communication via messengers (Viber, WhatsApp, Signal).

Key features include:

• Semi-manual call handling via operator request;
• ACD-based call distribution, IVR, call transfers between operators;
• Flexible visualization: statuses, call history, subscriber categories;
• Conference creation with full participant status tracking.

The product is built from scratch with no legacy code and offers high autonomy for the tech team. It's a mission-critical system for reliable internal communication within a large organization. Project participants will have a direct impact on architecture, features, and UX.

Goal and Development Context

The objective is to create a scalable and stable system for efficient subscriber connection within large organizations. Deep CRM integration, a user-friendly operator interface, and advanced communication control features are expected.

Project Benefits for Candidates

• A greenfield product with no legacy constraints
• Influence on technical decisions and architecture
• Stable funding and clearly defined structure
• Long-term technical support opportunity (part-time post-launch)
• Advanced VoIP domain tasks and modern tech challenges

Key Responsibilities

• Collaborate with the Architect to define technical specifications
• Develop call handling logic, conferencing, and operator GUI
• Design the backend/frontend architecture
• Integrate with CRM, databases, and messaging services
• Ensure system security, logging, and analytics
• Handle operator profiles and complex call connection workflows

Tech Stack

Final technologies will be selected by the Architect once the team is in place. Expected stack includes:

• VoIP platform: FreeSWITCH (FusionPBX)
• Protocols: SIP, RTP
• Web-based operator interface
• Integrations with CRM, messaging platforms (Viber, Signal, WhatsApp), and databases
• Logging, analytics, authentication, and security tools
• Linux/Windows-based server infrastructure, IP telephony

Candidate Requirements

Hard Skills:

• Experience with VoIP systems (FreeSWITCH, SIP, IVR, ACD)
• Understanding of scalable system design principles
• Proven CRM, API, and database integration experience
• Familiarity with security, logging, and system analytics practices

Soft Skills (preferred):

• Initiative in tackling technical challenges
• Ability to adapt in a flexible, evolving environment
• Strong collaboration across all project stages

Development Process & Phases

1. Technical specification development
2. Client approval of the spec
3. Team formation
4. Active development (6 months)
5. Ongoing support (1 year, part-time)

Team

Approx. 15 people: Architect/CTO, VoIP Engineers, Backend & Frontend Developers, QA Engineers, UI/UX Designer, DevOps Engineers, and Project Managers.