TUMBAWEB

Four ways to work together.

Web platforms, marketing sites, AI/LLM integration, and ongoing support. Every engagement is direct work with me — no middlemen, no handoffs to junior teams.

Services

Each tier has clear scope, deliverables, and starting price. Final pricing is set in the technical consultation.

01 — CUSTOM PLATFORM

Custom Web Platform

React + Node.js applications built to scale. Dashboards, portals, fintech integrations.


Starting at $15,000 USD

Timeline: 6 — 16 weeks depending on scope


Included

  • Discovery call and technical architecture
  • Technical proposal with defined scope and deliverables
  • React + TypeScript frontend with custom design system
  • Node.js / REST or tRPC backend
  • Database (PostgreSQL or MySQL) with migrations
  • Deployment to client infrastructure (AWS / Vercel)
  • Weekly demos during development
  • Technical documentation and full handoff

Not included

  • Native mobile applications (React Native is a separate engagement)
  • Ongoing content updates (that's the retainer)
  • Third-party service costs (AWS, Stripe, APIs)
  • Visual design from scratch without prior reference

Tech stack

React, TypeScript, Node.js, PostgreSQL/MySQL, AWS, Vercel, Stripe

Ideal for

Fintech startups with a defined product that need senior engineering to build or scale their platform. Buyers who value solid architecture over raw speed.

Schedule a consultation about this →

02 — MARKETING SITE

High-Performance Marketing Site

Next.js with SSR, bilingual, optimized for search and conversion. The site your fintech should have.


Starting at $8,000 USD

Timeline: 3 — 4 weeks


Included

  • Discovery call and messaging strategy
  • Design system and visual guide
  • Up to ~8 server-rendered pages (SSR/SSG)
  • Bilingual EN/ES support at the URL level
  • Full technical SEO (metadata, sitemap, structured data)
  • Lighthouse 95+ on performance and accessibility
  • Lightweight CMS for client content editing
  • Deployment to Vercel or AWS

Not included

  • Custom backend logic (accounts, dashboards, complex integrations)
  • E-commerce or payment processing
  • Content production (copy, photography, video)
  • Marketing strategy or campaign management

Tech stack

Next.js, React, TypeScript, Mantine UI, Vercel

Ideal for

Fintechs and funded startups that need to replace a generic existing site with one that communicates technical seriousness and converts qualified visitors.

Schedule a consultation about this →

03 — AI/LLM INTEGRATION

AI/LLM Integration

AI-powered applications: LLM integrations, RAG systems, document automation, agents for fintech workflows.


Starting at $20,000 USD

Timeline: 8 — 20 weeks depending on complexity


Included

  • Technical discovery of use case and architecture
  • AI pipeline design (RAG, agents, document processing)
  • Node.js or FastAPI backend for secure inference exposure
  • Integration with providers (OpenAI, Anthropic, Ollama for local inference)
  • Frontend with UX optimized for AI interactions
  • Security and compliance controls (rate limiting, logging, sensitive data redaction)
  • Weekly demos and iterative adjustments
  • Technical documentation and handoff

Not included

  • Training models from scratch
  • Inference costs (OpenAI, Anthropic, etc.)
  • Large-scale data annotation
  • Academic research or experimentation without a defined use case

Tech stack

Node.js, FastAPI, Python, OpenAI / Anthropic APIs, Ollama, PostgreSQL with pgvector, AWS

Ideal for

Fintechs and companies with clear AI use cases: KYC automation, financial document processing, support chatbots, agents for repetitive workflows. Buyers who understand AI is a tool for a concrete problem, not a solution looking for one.

Schedule a consultation about this →

04 — TECHNICAL RETAINER

Technical Retainer

Maintenance, monitoring, and ongoing improvements. For clients with platforms already in production.


Starting at $500/mo

Timeline: Monthly, renewable


Included

  • Infrastructure monitoring and alerts
  • Security patches and dependency updates
  • Continuous performance optimization
  • Small improvements and new features (up to a monthly hours budget)
  • Incident response within agreed SLA
  • Monthly technical review meetings

Not included

  • Full rewrites or major features (those are new engagements)
  • 24/7 support (unless explicitly agreed)
  • Work under third-party NDA (must be agreed case by case)

Tech stack

Whatever your platform runs on

Ideal for

Clients with platforms in production who need a senior engineer accessible for maintenance, minor improvements, and incident response — without hiring a full-time employee.

Schedule a consultation about this →

These ranges reflect senior engineering. At equivalent US agencies, comparable projects typically cost 2-3x more.

Who this is for

This work is for companies that treat their web platform as critical infrastructure — fintech, payment platforms, edtech, exchanges, marketplaces. It's direct senior engineering, with over a decade building production systems for financial institutions and tech companies.

If you're looking for a basic WordPress site, a simple landing page, or your first online store, I can recommend excellent agencies across LATAM that specialize in that work — but it's not what I do. My focus is building the platforms your business depends on to operate.

How we work together

The same process for every engagement, no surprises.

01

Discovery call

Free 30 minutes. We figure out what you need, what stack makes sense, and whether we fit.

02

Technical proposal

Detailed scope, timeline, fixed price. No vague language, no hidden surprises.

03

Build with weekly demos

Every Friday you see real progress. Scope changes are discussed before being implemented.

04

Handoff and retainer (optional)

Complete documentation, verified deployment, transition to technical retainer if needed.

Frequently asked questions

Let's start with a conversation.

30 minutes to understand what you need. Then you decide if you want to continue.

Schedule a technical consultation

Or send a direct message if you prefer to write first.