Senior Full Stack Developer â AI Digital Platform

Onit Energy; Toronto; Hybrid; CAD 90,000 - 120,000; Full time

Job summary

A technology company is looking for a Senior Full-Stack Developer to architect and build AI-driven systems. You will lead the CRM development and collaborate on integrations with telephony systems. The ideal candidate has 7 years of experience, strong skills in Python, React, and real-time systems, and thrives in a collaborative environment. This role offers competitive compensation and a flexible work culture.

Benefits

Competitive compensation package

Flexible hybrid work culture

Qualifications

• 7 years of full-stack development experience.
• Strong expertise in Python and FastAPI.
• Proficiency in React for frontend web apps.
• Solid experience with PostgreSQL and Redis.
• Hands-on experience with real-time systems.
• Ability to design and scale REST APIs.

Responsibilities

• Build and maintain FastAPI services for AI Management System.
• Design clean REST APIs for CRM integrations.
• Lead development of the CRM operator console.
• Integrate backend services with telephony systems.
• Optimize system performance for high-volume calls.
• Mentor junior developers.

Skills

Full-stack development

FastAPI

React

PostgreSQL

Redis

WebRTC

DevOps

Telephony integration

Tools

Docker

Kubernetes

Job description

About Us

We are building a next-generation AI Digital Platform that combines voice-enabled conversational AI telephony integration and a lightweight CRM into one seamless system.

This is a high-impact hands-on role where youll help architect and build production-grade systems that span AI real-time telephony and modern SaaS web applications.

Role Overview

As a Senior Full-Stack Developer you will take ownership of critical components across our stack from the CRM frontend / backend to the AI management orchestration system and its integrations. You will collaborate closely with our AI / ML engineers (who focus on STT / LLM / TTS models) and infrastructure team ensuring that data APIs and workflows are robust scalable and reliable.

You will thrive if you enjoy working in high-performance real-time systems and have experience bridging frontend usability with backend orchestration.

Key Responsibilities

Backend & API Development

• Build and maintain FastAPI / services powering the AI Management System (call orchestration dialogue state outcome extraction).
• Design clean REST APIs and Webhooks for CRM telephony and automation integrations (e.g. n8n).
• Implement robust data models in PostgreSQL and caching / queuing via Redis.

Frontend & CRM Development

• Lead development of the CRM operator console (React / ).
• Create dashboards for lead management call outcomes and campaign analytics.
• Ensure intuitive UI / UX for sales teams monitoring AI calls.

Systems Integration

• Integrate backend services with telephony (Asterisk / FreeSWITCH SignalWire Twilio) and real-time audio I / O (WebRTC / GStreamer).
• Connect AI pipeline outputs (STT / LLM / TTS) to CRM outcomes.
• Implement flexible adapters for direct CRM API connections and workflow automation via n8n.

Scalability & Observability

• Optimize system performance for high-volume concurrent calls.
• Implement monitoring logging and alerting with Prometheus Grafana and Sentry.
• Ensure fault-tolerance and horizontal scalability of orchestration and web services.

Collaboration & Leadership

• Work closely with AI developers (LLM speech models) to ensure seamless integration.
• Participate in architectural reviews code reviews and mentoring junior developers.
• Contribute to the technical roadmap and best practices for CI / CD testing and security.

Key Qualifications Must Have

• 7 years of full-stack development experience.
• Strong expertise in and / or Python (FastAPI asyncio).
• Proficiency in React / for frontend web apps.
• Solid experience with PostgreSQL and Redis (queues caching pub / sub).
• Hands-on experience with real-time systems (WebRTC SIP / VoIP or similar).
• Proven ability to design build and scale REST APIs and distributed systems.
• Strong understanding of DevOps in cloud environments (AWS / Azure Docker Kubernetes a plus).
• Familiarity with telephony stacks (Asterisk FreeSWITCH SignalWire or Twilio).
• Experience integrating external SaaS APIs (CRMs automation tools).

Nice to Have

• Exposure to AI / ML workflows (LangChain LLM APIs Whisper TTS engines).
• Knowledge of real-time streaming frameworks (GStreamer Kafka WebSockets).
• Prior experience building high-throughput sales / communications platforms.
• Familiarity with feature flagging A / B testing and experimentation frameworks.

Why Join Us

Be a foundational engineer shaping a product at the frontier of AI voice agents and CRM platforms.

Work with a small agile team where your code ships fast and your ideas matter.

Competitive compensation package

Flexible hybrid work culture with a strong focus on ownership and innovation.

This role is for someone who thrives in building complex systems end-to-end enjoys solving real-time distributed challenges and wants to see their work directly power a live AI sales platform.

Please send a cover letter and salary expectations. NO PHONE CALLS PLEASE.

Required Experience :

Senior IC

Key Skills

Civil,Bidding,GIS,Capital Market,Cement,Agricultural

Employment Type :

Full-Time

Experience :

years

Vacancy :

1