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Full-Stack Web Developer (React & Node.js, WebRTC, Multilingual) – Remote Contract
Upwork • , US • Remote
Posted on: 11th March, 2025
Employment Type: CONTRACTOR
Job Description
About Us:
We are a startup building a Web MVP focused on emotional support and validation for users who feel overwhelmed, lonely, or in need of someone to talk to. Our platform will provide a seamless and engaging user experience with a freemium model, multilingual support, and voice-based interactions.
We are looking for a Full-Stack Web Developer to help build the MVP from the ground up, including real-time voice talkback features and multilingual support. This is a fully remote, contract-based role with the opportunity to extend based on performance.
Key Responsibilities:
Develop & launch the Web MVP using React.js, Node.js, and Firebase/Supabase.
Implement real-time voice talkback functionality using WebRTC, WebSockets, or other real-time frameworks.
Optimize and manage traffic handling to ensure smooth performance under increasing user loads.
Integrate authentication systems (OAuth, Firebase Auth, JWT).
Develop APIs and database models for voice interactions, multilingual text processing, subscriptions, and user-generated content.
Ensure multilingual support by integrating translation APIs (Google Translate, DeepL) and localized UI components.
Ensure responsive and mobile-friendly UI using Tailwind CSS.
Optimize performance to handle a growing user base and prevent downtime.
Implement caching & load balancing techniques to handle traffic spikes efficiently.
Integrate third-party services (e.g., payment gateways like Stripe, analytics, and chat features).
Deploy & maintain the MVP using Vercel, Netlify, AWS, or DigitalOcean.
Work closely with the UI/UX Designer to ensure a smooth user experience.
Identify and fix bugs before launch and support post-launch refinements.
Required Skills & Qualifications:
Proficiency in Full-Stack Development
Front-End: React.js, Next.js (optional), Tailwind CSS
Back-End: Node.js, Express.js
Database Management: Firebase, Supabase, MongoDB, or PostgreSQL
Authentication Systems: Firebase Auth, JWT, OAuth
Voice Talkback & Real-Time Communication
WebRTC or WebSockets for real-time voice interactions
Speech-to-Text APIs (Google Cloud Speech-to-Text, AWS Transcribe, Whisper API)
Text-to-Speech APIs (Google TTS, ElevenLabs, AWS Polly)
Latency Optimization & Audio Processing
Multilingual Support & Localization
Translation APIs (Google Translate, DeepL, OpenAI APIs)
Multi-language UI implementation
Handling Unicode & language-specific formatting
Traffic Handling & Scalability
Experience managing web traffic & load balancing
Implementing caching strategies (Redis, CDN, or browser caching)
Optimizing database queries for high-traffic loads
Handling concurrent user requests efficiently
API Development & Integration
RESTful API design and integration
WebSockets (if real-time features are needed)
Strong Deployment & DevOps Knowledge
Experience with Vercel, Netlify, AWS, or DigitalOcean
CI/CD pipeline experience (GitHub Actions is a plus)
Serverless architecture understanding is a plus
Security & Performance Optimization
Understanding of web security best practices (CORS, authentication flows, encryption)
Optimizing app load times & database queries
Version Control & Collaboration
Git & GitHub/GitLab for code management
Familiarity with Agile development processes
Problem-Solving Mindset & Startup Mentality
Ability to work independently and efficiently with minimal supervision
Willingness to iterate fast, troubleshoot, and meet deadlines
Experience in building MVPs or working in early-stage startups is a plus
Preferred Skills:
AI-powered language processing (e.g., OpenAI Whisper, ElevenLabs)
Advanced A/B Testing & User Behavior Analytics
Experience with SEO & Web Performance Optimization
Real-time chat or social platform experience
Why Join Us?
Impact – Your work will shape a product that helps people feel seen and validated.
Remote & Flexible – Work from anywhere, on your schedule.
Fast-Paced Startup Culture – Move fast, make decisions, and iterate quickly.
Competitive Compensation – Contract-based, with potential for extension.
We are a startup building a Web MVP focused on emotional support and validation for users who feel overwhelmed, lonely, or in need of someone to talk to. Our platform will provide a seamless and engaging user experience with a freemium model, multilingual support, and voice-based interactions.
We are looking for a Full-Stack Web Developer to help build the MVP from the ground up, including real-time voice talkback features and multilingual support. This is a fully remote, contract-based role with the opportunity to extend based on performance.
Key Responsibilities:
Develop & launch the Web MVP using React.js, Node.js, and Firebase/Supabase.
Implement real-time voice talkback functionality using WebRTC, WebSockets, or other real-time frameworks.
Optimize and manage traffic handling to ensure smooth performance under increasing user loads.
Integrate authentication systems (OAuth, Firebase Auth, JWT).
Develop APIs and database models for voice interactions, multilingual text processing, subscriptions, and user-generated content.
Ensure multilingual support by integrating translation APIs (Google Translate, DeepL) and localized UI components.
Ensure responsive and mobile-friendly UI using Tailwind CSS.
Optimize performance to handle a growing user base and prevent downtime.
Implement caching & load balancing techniques to handle traffic spikes efficiently.
Integrate third-party services (e.g., payment gateways like Stripe, analytics, and chat features).
Deploy & maintain the MVP using Vercel, Netlify, AWS, or DigitalOcean.
Work closely with the UI/UX Designer to ensure a smooth user experience.
Identify and fix bugs before launch and support post-launch refinements.
Required Skills & Qualifications:
Proficiency in Full-Stack Development
Front-End: React.js, Next.js (optional), Tailwind CSS
Back-End: Node.js, Express.js
Database Management: Firebase, Supabase, MongoDB, or PostgreSQL
Authentication Systems: Firebase Auth, JWT, OAuth
Voice Talkback & Real-Time Communication
WebRTC or WebSockets for real-time voice interactions
Speech-to-Text APIs (Google Cloud Speech-to-Text, AWS Transcribe, Whisper API)
Text-to-Speech APIs (Google TTS, ElevenLabs, AWS Polly)
Latency Optimization & Audio Processing
Multilingual Support & Localization
Translation APIs (Google Translate, DeepL, OpenAI APIs)
Multi-language UI implementation
Handling Unicode & language-specific formatting
Traffic Handling & Scalability
Experience managing web traffic & load balancing
Implementing caching strategies (Redis, CDN, or browser caching)
Optimizing database queries for high-traffic loads
Handling concurrent user requests efficiently
API Development & Integration
RESTful API design and integration
WebSockets (if real-time features are needed)
Strong Deployment & DevOps Knowledge
Experience with Vercel, Netlify, AWS, or DigitalOcean
CI/CD pipeline experience (GitHub Actions is a plus)
Serverless architecture understanding is a plus
Security & Performance Optimization
Understanding of web security best practices (CORS, authentication flows, encryption)
Optimizing app load times & database queries
Version Control & Collaboration
Git & GitHub/GitLab for code management
Familiarity with Agile development processes
Problem-Solving Mindset & Startup Mentality
Ability to work independently and efficiently with minimal supervision
Willingness to iterate fast, troubleshoot, and meet deadlines
Experience in building MVPs or working in early-stage startups is a plus
Preferred Skills:
AI-powered language processing (e.g., OpenAI Whisper, ElevenLabs)
Advanced A/B Testing & User Behavior Analytics
Experience with SEO & Web Performance Optimization
Real-time chat or social platform experience
Why Join Us?
Impact – Your work will shape a product that helps people feel seen and validated.
Remote & Flexible – Work from anywhere, on your schedule.
Fast-Paced Startup Culture – Move fast, make decisions, and iterate quickly.
Competitive Compensation – Contract-based, with potential for extension.
Responsibilities
- This is a fully remote, contract-based role with the opportunity to extend based on performance
- Develop & launch the Web MVP using React.js, Node.js, and Firebase/Supabase
- Implement real-time voice talkback functionality using WebRTC, WebSockets, or other real-time frameworks
- Optimize and manage traffic handling to ensure smooth performance under increasing user loads
- Integrate authentication systems (OAuth, Firebase Auth, JWT)
- Develop APIs and database models for voice interactions, multilingual text processing, subscriptions, and user-generated content
- Ensure multilingual support by integrating translation APIs (Google Translate, DeepL) and localized UI components
- Ensure responsive and mobile-friendly UI using Tailwind CSS
- Optimize performance to handle a growing user base and prevent downtime
- Implement caching & load balancing techniques to handle traffic spikes efficiently
- Integrate third-party services (e.g., payment gateways like Stripe, analytics, and chat features)
- Deploy & maintain the MVP using Vercel, Netlify, AWS, or DigitalOcean
- Work closely with the UI/UX Designer to ensure a smooth user experience
- Identify and fix bugs before launch and support post-launch refinements
- Multilingual Support & Localization
- Translation APIs (Google Translate, DeepL, OpenAI APIs)
- Multi-language UI implementation
- Handling Unicode & language-specific formatting
- Traffic Handling & Scalability
- Optimizing database queries for high-traffic loads
- Handling concurrent user requests efficiently
- API Development & Integration
- RESTful API design and integration
- Optimizing app load times & database queries
- Version Control & Collaboration
Requirements
- Proficiency in Full-Stack Development
- Front-End: React.js, Next.js (optional), Tailwind CSS
- Back-End: Node.js, Express.js
- Database Management: Firebase, Supabase, MongoDB, or PostgreSQL
- Authentication Systems: Firebase Auth, JWT, OAuth
- WebRTC or WebSockets for real-time voice interactions
- Speech-to-Text APIs (Google Cloud Speech-to-Text, AWS Transcribe, Whisper API)
- Experience managing web traffic & load balancing
- Implementing caching strategies (Redis, CDN, or browser caching)
- WebSockets (if real-time features are needed)
- Strong Deployment & DevOps Knowledge
- Experience with Vercel, Netlify, AWS, or DigitalOcean
- Understanding of web security best practices (CORS, authentication flows, encryption)
- Git & GitHub/GitLab for code management
- Familiarity with Agile development processes
- Problem-Solving Mindset & Startup Mentality
- Ability to work independently and efficiently with minimal supervision
- Willingness to iterate fast, troubleshoot, and meet deadlines
- AI-powered language processing (e.g., OpenAI Whisper, ElevenLabs)
- Advanced A/B Testing & User Behavior Analytics
- Experience with SEO & Web Performance Optimization
- Real-time chat or social platform experience
Upwork
Technology
Job Type
CONTRACTOR
Benefits
- Remote & Flexible – Work from anywhere, on your schedule
- Fast-Paced Startup Culture – Move fast, make decisions, and iterate quickly
- Competitive Compensation – Contract-based, with potential for extension
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