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I will be your software developer, mern stack developer, web app development
Daniel Marquez
About this gig
Still stuck with a slow, buggy, or half-built web app?
MERN stack development can fix that and that's exactly what I do.
I'm Daniel, a MERN stack developer with 10+ years of experience. I build custom web apps and SaaS platforms that are fast, scalable, and built to last.
What You'll Get:
- Custom web application development (MERN stack)
- SaaS development from idea to launch
- REST API development & integrations
- CRUD applications & database design
- User authentication & user management
- Admin panel & dashboard development
- Responsive web apps for any device
- Backend development & server architecture
- Bug fixes, optimization & code reviews
Tech I Work With:
MongoDB, Express, React, Node.js, Next.js, Tailwind, Stripe, REST APIs.
What Makes This Different:
- I'm a senior developer, not a junior freelancer I write clean, scalable code, not quick patches
- 50+ products and systems delivered, generating $1M+ in measurable value for clients
- Apps built to handle real users and grow, not break under traffic
Ready to build your web app the right way?
Message me and let's start your MERN project.
Get to know Daniel Marquez
Daniel Marquez
AI Automation Developer, n8n workflow, n8n expert, AI Agents
- FromColombia
- Member sinceMar 2014
- Avg. response time1 hour
- Last delivery2 years
Languages
English, Spanish
Hey! I'm Daniel M — Automation Engineer (10+ yrs) building n8n workflows & AI agents that save businesses time and money. 🚀
🔁 n8n workflow automation
🤖 AI agents (Claude, GPT, Gemini)
📊 CRM & lead automation
🔗 API & webhook integrations
🗂️ Airtable, Notion & Sheets automation
🛒 E-commerce & order workflows
I also bring deep experience building SaaS, MVPs & scalable apps with Next.js, React, Node, Supabase & Firebase.
⚡ Fast delivery
🧠 Clean architecture
📈 Real, measurable results
My Portfolio
Other Software Development Services I Offer
FAQ
What exactly is the MERN stack, and why use it?
MERN stands for MongoDB, Express, React, and Node.js — a JavaScript-based stack that lets me build your entire web application, frontend and backend, using one language. It's fast, flexible, and ideal for custom web apps and SaaS development that need to scale.
Can you build a full SaaS product, not just a simple website?
Yes. I build complete SaaS platforms with user authentication, user management, admin panels, dashboards, and database design, so you get a real product, not just a static site.
Do you handle backend development and APIs as well as the frontend?
Yes, I handle both. On the backend, I build REST APIs, CRUD applications, and database structures with Node.js and MongoDB; on the frontend, I build responsive web apps with React, so the whole system works together smoothly.
Can you add a dashboard or admin panel to manage users and data?
Yes, I regularly build custom dashboards and admin panels for managing users, content, orders, or analytics, with secure user authentication and role-based access included.
Will my app work well on mobile devices?
Yes, every web app I build is fully responsive, meaning it adapts cleanly to phones, tablets, and desktops without needing a separate mobile app.
