I build fast websites and web apps for businesses.
I'm César Jerez — a full stack developer in San José, Costa Rica, working at the intersection of web development, electronics, and system architecture. From landing pages to custom internal tools, I build things that work.
What I can build for you
Web apps & internal tools
Dashboards, portals, and custom software built around your workflow.
Discovery
Free call — we scope what you actually need.
Proposal
Fixed price for fixed scope, in writing.
Build
Weekly progress, no black-box silence.
Handoff
All code and credentials — it's yours.
Things I build for fun
Electronics, CNC, generative sketches — the stuff that doesn't fit a client brief.
Parallax Circles
A pointer-following SVG composition. Concentric rings shift on a per-layer parallax factor while each ring slowly counter-rotates on its own clock.
View →
Gray-Scott
A live reaction-diffusion field running on the GPU. Two virtual chemicals feed, react, and diffuse into coral, maze, and mitosis patterns you can paint into.
View →
Reaction Sphere
Gray-Scott reaction-diffusion running across the surface of an icosphere. Each vertex reacts and diffuses with its mesh neighbors on the GPU, in 3D you can spin.
View →Core stack
- React
- Next.js
- TypeScript
- Tailwind CSS
- Node.js
- Express
- PostgreSQL
- REST / GraphQL
- VHDL
- PCB design
- Embedded C
- CNC / 3D printing
- Git
- Docker
- CI/CD
- Figma
Have a project in mind?
Tell me what you're trying to build — a couple of sentences is enough to get started. I reply within one business day.
By sending this form, you agree to your details being used to reply to you, as described in the Privacy Policy.
I reply within one business day