Full-stack App Developer (WebRTC & Speech Recognitio

1️ Required Development Languages / Tech StackFrontend / Mobile App

• iOS → Swift + CallKit, AVFoundation
• Android → Kotlin/Java + ConnectionService, Media APIs
• Video Call → WebRTC SDK (peer.js, Twilio Video, Agora SDK)
• Speech Recognition (STT) → iOS Speech Framework, Android SpeechRecognizer API, Web Speech API
• Text-to-Speech (TTS) → iOS AVSpeechSynthesizer, Android TextToSpeech

Backend

• Node.js / Express or Python FastAPI
• Real-time signaling server for WebRTC
• Authentication / call management / user database
• Integration with STT/TTS APIs (Google Cloud, Azure, Naver)

Web Page

• React / Next.js (service introduction, sign-up, subscription payment)
• Payment integration → Stripe, PayPal

2️ Required Servers / Infrastructure

• Cloud hosting (AWS, GCP, Azure)
• TURN/STUN server for WebRTC NAT traversal
• Database (MySQL, PostgreSQL, Firebase, etc.)
• Push notification server

3️ App Service Structure

• User sign-up / login
• Automatic video call reception
• Voice command call initiation (“Call [Name]”) with voice feedback
• Call logs / status display
• Web page / in-app subscription payments (free & paid)

4️ Business Model

• Free features: basic video call and voice call
• Paid subscription:
• Unlimited call duration
• Ad removal
• High-definition video / priority connection
• Payment: subscription (monthly / yearly), in-app payments (iOS, Android)

✅ Summary TableCategoryTech / SpecificationMobile AppSwift / Kotlin, CallKit / ConnectionService, WebRTC SDKSpeech RecognitioniOS Speech Framework, Android SpeechRecognizer, TTSBackendNode.js / Python FastAPI, signaling server, DB, STT/TTS APIWeb PageReact / Next.js, Payment (Stripe/PayPal)ServersCloud, TURN/STUN, Push NotificationBusiness ModelFree features + Paid subscription, monthly/yearly, ad removal / HD video / unlimited call time

Job Type: Contract
Contract length: 12 months

Pay: ₦300,000.00 - ₦600,000.00 per month