Jesús Hernández
Jesús Hernández
All services

Web app design & development

Products people log in to every day.

Price
Quoted per project
Tell me about your project

A web app is more than pages: it has users, accounts, data that changes and a state for every case. I design and build SaaS products, dashboards, client portals and internal tools, from the user flows in Figma to the code in Next.js, React and TypeScript, with the backend they need behind them.

When it helps, I add AI that does a real job in the product: search over your data, summaries, assistants or automations, built with limits and checks. And if you already have an app made with Lovable, v0, Bolt or Cursor, I review it, fix what's risky and get it ready for production.

What's included

  1. 01Research, user flows and interface design, with a design system
  2. 02Authentication, roles and permissions
  3. 03Database and API with Supabase, Postgres or your current stack
  4. 04Payments and subscriptions with Stripe when the product charges
  5. 05AI features and agents with Claude or OpenAI, with usage limits and quality checks
  6. 06Review and hardening of apps built with AI tools before launch

A good fit if

Questions about this service

How long does a first version take?
A focused first version usually takes 6 to 12 weeks; taking an AI-built prototype to production, 2 to 4. We decide together what goes in and what waits.
Can you take over an app built with Lovable, v0 or Bolt?
Yes. I start with a code review and a written list of what's at risk, then fix it without rewriting what already works. Most of the time it's access rules, data and deploy.
Where does AI make sense in my product?
Where it saves someone a repetitive task: finding information, summarizing, filling forms or moving data between tools. We look for those tasks first and skip the ones where it doesn't help.
Who owns the code?
You do. The code lives in your repository and the services run on your accounts from day one.
Tell me about your project

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