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Hi! I'm Carlos Castillo, Software Engineer.

With 10+ years designing frontend and backend systems with Figma, Angular, TypeScript, Spring Boot and PostgreSQL, I ship faster with an AI-assisted workflow, from Figma to code.

Get in touch See recent projects
contact@cmaxhm.com
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  • KMApp admin dashboard
  • Memorial Sloan Kettering Cancer Center logo
  • Procurement platform logo

About me

I work with companies and startups to launch web products faster: from the data model to the interface in production

I've spent more than 10 years building frontend and backend systems end to end. Today I combine that experience with AI tools to move from design to production faster, without sacrificing reliability, accessibility or performance.

10+

Years building frontend and backend systems

40%

Better medicine shipment management at MSKCC

60%

Fewer manual contracting steps on a public procurement platform

50%

Time-efficiency improvement using AI assistance

More about me

Portfolio

Featured projects

Products I've designed, built and launched, with measurable results.

See all projects
  • KMApp admin dashboard

    Micro SaaS · 2025

    KMApp

    My own multi-tenant SaaS: a digital menu with ordering and delivery for small and mid-sized kiosks and restaurants.

    AWS · Docker · Angular · Spring Boot · PostgreSQL · Keycloak · GitLab

    Read case study: KMApp
  • Memorial Sloan Kettering Cancer Center logo

    Supply chain · 2026

    MSKCC

    A platform to manage and optimize the supply chain operations of Memorial Sloan Kettering Cancer Center, with REST APIs and AI.

    Angular · Docker · Tailwind CSS · PostgreSQL

    Read case study: MSKCC
  • Procurement platform logo

    GovTech · 2024–2026

    Public procurement platform

    A public procurement platform used by Colombian government applications to manage state purchasing processes.

    Angular · Frontend

    Read case study: Public procurement platform

Services

What I can build with you

From the data model to the interface: six ways to help you launch and grow your product.

All services

  • Fullstack web development

    Complete web apps with Angular, Spring Boot and PostgreSQL: from the data model to the interface in production.

    See fullstack web development

  • Angular frontend

    Accessible, immersive interfaces with Angular, TypeScript, Tailwind CSS and GSAP.

    See Angular frontend

  • Backend & APIs

    Scalable APIs and secure data processing with Spring Boot and PostgreSQL in the cloud.

    See backend & APIs

  • SaaS & MVP development

    From idea to a working multi-tenant product. I designed, built and run my own SaaS end to end.

    See SaaS & MVP development

  • AI-assisted development

    A Figma → Claude → Code workflow to ship faster, plus AI features integrated through APIs.

    See AI-assisted development

  • Mentoring

    Need guidance for yourself or your organization? Let's talk about your goals.

    See mentoring

Tech stack

Tools I trust in production

Chosen for developer experience, without sacrificing performance in production.

  • TypeScript
  • Java
  • Tailwind CSS
  • GSAP
  • Keycloak
  • GitLab CI
  • Claude Code
  • Figma
  • Angular
  • Spring Boot
  • PostgreSQL
  • Docker
  • GitLab
  • AWS
  • GitHub

Pricing

Simple, transparent pricing.

Pay by the hour or with a monthly plan. Prices in USD or COP.

Prices in USD

Flexible

Recommended

$20USD / hour

Pay only for the hours worked, with transparent weekly reports and sprint-based deliveries.

Monthly

$3,100USD / month

A monthly rate for ongoing work, agreed in advance, with the same weekly reports.

See pricing Get in touch

Billed weekly (Flexible) or monthly · Invoices in USD or COP

Process

What working with me looks like

A short, predictable path from the first message to production.

  1. A first message

    Email or WhatsApp me about the problem or the role. I'll tell you honestly whether I'm a good fit.

  2. A clear proposal

    Scope, timeline and way of working, in writing.

  3. Weekly deliveries

    Progress deployed every week, so you make decisions based on real software.

  4. Launch and handover

    Production deployment, documentation and the code in your repository.

For recruiters

Looking for a profile like mine for your team?

Info for recruiters

FAQ

Frequently asked questions

Quick answers about availability, pricing and how I work.

See all questions

Yes. I work remotely from Colombia (UTC−5) for clients in Colombia, Latin America and other countries.

Blog

Notes from the Involved Studio blog

I write about software engineering, product and AI at blog.involvedstudio.com (in Spanish).

Visit the blog(opens in a new tab)