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I will build self hosted agent with backend db auth elevenlabs API revops CRM cro audit
Marvel Zuks
About this gig
Need a powerful AI application backend that connects your AI, voice, CRM and business workflows?
I will build or integrate a secure AI backend with APIs, databases, authentication, ElevenLabs voice, AI agents and CRM/RevOps systems.
I can help turn your AI app, SaaS idea, voice product or existing frontend into a structured backend that actually connects the different parts of your business.
What I can build and integrate:
- AI websites and application backend
- REST APIs and third-party API integrations
- Supabase / PostgreSQL / Firebase / MongoDB
- Node.js / Python / FastAPI
- Security, Authentication & User management Auditing
- OpenAI / Claude / Gemini integrations
- Vapi / Retell AI voice agents
- ElevenLabs voice n8n Webhook automation
- Authorized multilingual voice cloning, voice video dubbing audio flows
- RevOps CRM HubSpot / GoHighLevel / Salesforce
- Shopify Customer Support Shop CRO Auditing
- Lead capture, route, Nurturing
- CRM Google Calendar Appointment Booking follow-up automation
- Data models, API & system architecture
I also auditing your website, agent, chatbot Hippa GDPR Security, CRM, Shopify CRO, store, shops, brand identity for AI SEO GEO AEO Search Visibilities.
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Get to know Marvel Zuks
Marvel Zuks
Full Stack AI Engineer Voice Engineering ChatBot App BcakEnd Engineering
- FromUnited Kingdom
- Member sinceMay 2026
- Avg. response time1 hour
Languages
English, Spanish, French, German
I Am Marvel Zuks Solutions, A Full-Stack AI Engineer specializing in AI voice systems, intelligent agents, automation, and scalable software development. I build production-ready AI voice agents, chatbots, SaaS platforms, web and mobile apps, APIs, backend systems, and DevOps infrastructure. My expertise spans AI development, machine learning, Python, JavaScript, React, Node.js, PHP, cloud deployment, databases, n8n, APIs, and leading AI platforms. I turn complex ideas into secure, scalable products that are built to perform and grow.
My Portfolio
Other AI Development Services I Offer
FAQ
What's the difference between a frontend and a backend for an AI website or app?
The frontend is what users see and interact with. The backend is the engine behind it : APIs, databases, authentication, security, and AI model integrations (OpenAI, Claude, Gemini) that process data, secure access, and power the app's actual functionality.
Can you build a backend for native hybrid ai app or custom websites or dashboards that already has a ui frontend?
Yes. I regularly connect backends to existing frontends built in React, Next.js, Flutter, or similar frameworks. I review your current code or API requirements, then design a backend with matching endpoints, database structure, and authentication.
What database should I use for an application or my business website ?
It depends on your data structure. Supabase and PostgreSQL suit relational data and auth-heavy apps; Firebase suits real-time apps; MongoDB suits flexible, document-based data. I help evaluate your use case and recommend the right fit.
How do I integrate OpenAI, Claude, or Gemini into my app's backend?
AI models connect through backend API calls that handle prompts, responses, rate limits, and error handling. I build this integration layer securely, keeping API keys server-side and structuring requests so your app scales without breaking.
What is backend authentication and why does my app need it?
Authentication verifies who's accessing your app and controls what they can see or do. I implement secure login systems using OAuth or JWT, protecting user data, AI usage, and business logic from unauthorized access or misuse.
Can voice AI tools like Vapi, Retell, or ElevenLabs be connected to a backend?
Yes. These voice platforms need a backend to handle triggers, data storage, and workflow logic. I connect voice AI tools to your database, APIs, and business systems so conversations translate into real actions and stored data.
Do I need a backend developer if I'm using no-code AI tools?
YES, A. No-code tools handle surface-level logic, but production AI apps still need secure authentication, structured databases, and custom API integrations to scale reliably beyond basic prototypes. THAT IS WHY I AM HERE TO HELP YOU, SO YOU DONT STRESS YO t URSELF LOOKING ELSE WHERE.
