In-House Full-Stack Developer - SPA/MPA + Telephony (Twilio/SIP/API)

Job Description

Job Description

Required Qualifications

• 3+ years full-stack development experience (with real-world deployments)

• Experience building SPAs and MPAs with clean code and scalable structure

• Strong Twilio experience (Voice, SMS, SIP, Programmable Video, TaskRouter)

• Strong understanding of call routing logic, SIP trunks, STUN/TURN servers

• Experience with API integration (Google Workspace, Stripe, CRM systems)

• Fluency in modern front-end frameworks and UI/UX design thinking

• Excellent communication and documentation skills

• Ability to work independently and move fast

Responsibilities

• Architect and build scalable front-end SPAs and MPAs from scratch.

• Integrate with Twilio Programmable Voice, SMS, SIP Trunks, and TaskRouter.

• Build real-time dashboards, inboxes, contact managers, and dialer controls.

• Manage backend APIs, databases, queues, and session handling.

• Implement secure user authentication and account roles.

• Lead and maintain internal dev documentation and GitHub workflows.

• Collaborate directly with the founder and internal team on features and vision.

• Deploy updates and manage release cycles through CI/CD.

What You’ll Be Working On

• A SPA (Single Page Application) dashboard for reps and managers (React + Tailwind, or similar).

• An MPA (Multi-Page Application) admin backend for compliance, analytics, and account controls.

• A built-in dialer, SMS, and inbox interface similar to RingCentral and Kixie.

• Real-time voice & SMS routing (Twilio SIP, programmable voice, text APIs).

• Integrations with CRMs, Google Workspace, email systems, call recording, webhooks, etc.

• A beautiful, functional UI that looks modern and is fast, responsive, and intuitive.

Tech Stack (Ideal but not all required)

• Front-End: React, Vue, TailwindCSS, Next.js, Vite

• Back-End: Node.js, Express, Python (FastAPI or Flask), REST APIs

• Databases: PostgreSQL, MongoDB, Redis, Firebase

• Telephony: Twilio Voice/SMS, SIP trunking, TaskRouter, WebRTC

• DevOps: GitHub, Docker, Nginx, CI/CD tools

• Other: OAuth2, Google APIs, Webhooks, Stripe integration

Bonus Points For

• Experience with RingCentral, Kixie, Five9, or similar platforms

• Prior experience with contact center/dialer software

• Understanding of compliance (TCPA, opt-in workflows)

• Experience working in startups or high-growth SaaS teams

• Prior CTO or lead dev experience

Compensation & Benefits

• Competitive salary (based on experience)

• Performance-based equity or bonus structure

• Direct influence on product roadmap and tech direction

• Long-term role with growth into a lead or CTO position

• Flexible work hours and a fast-moving, no-BS environment