01
Frontend engineering
Production React / Next.js shops. App router, server components, MDX, GSAP, Tailwind. The kind of TypeScript that fails before it ships.
ReactNext.jsTypeScriptGSAPTailwindRxJS
Bio · Caracas → Madrid → wherever the work is
Jean Rojas.Lead engineer, founder, mentor.
Self-taught from Caracas. Twelve years writing software, mostly for the web. Currently Lead Engineer on Pandora’s Engraving team and founder of Squidred, a small product-engineering studio. Past lives: DHL, Rakuten, Falabella / Mallplaza, FactoryFix, Coderhouse, Areuin, plus a decade of agency and freelance work across Latin America, the US and Europe.
By the numbers · audited from real shipped work
Twelve years, in tiles.
The reverse-chronological breakdown lives on the experience page. Up here, the whole arc at a glance — real GitHub people, real counts, real activity. Anything not yet wired loads from a JSON I replace as I export the data.
Shipping software
0yrs
From XAMP/PHP in 2015 to Lead Engineer at Pandora today. The arc below isn’t metaphor — it’s every year, plotted.
Connections · GitHub graph
0real public connections
Followers + accounts I follow, pulled live from api.github.com — no marketing fluff, just the actual graph.
- loading the graph…
LinkedIn recommendations land here once exported into data/linkedin-recommendations.json.
X · @rojsdev
Drafting…
Follow @rojsdev →
Stacks shipped
0web · mobile · 3D · AI
- React / Next.js
- Three.js / R3F
- GLSL / WebGL
- ONNX / WASM
- transformers.js
- Node / Express
- .NET / C#
- Postgres
- Expo / React Native
- Kotlin
Infra cost
−200%↓ live
Areuin · AWS → Azure / k8s
Roles · companies
0/0
Pandora
GitHub · @jeanc18rlos
- Repos
- —
- Followers
- —
- Following
- —
Coursera · learning
—certs in flight
loads from data/coursera.json
ADPList · mentor
Book a 30-min 1:1.
Frontend, 3D, AI on-device, career, code reviews. Free.
Available
LinkedIn · connect
Open to roles, talks & collabs.
Recommendations land here once exported.
Live activity · last 30 days
Real things, real receipts.
Experience · ten companies, twelve years
The companies behind the receipts.
Logo cloud first, deep dive after. Each carousel slide is one role — company on the left, what I shipped on the right. Auto-advances every 7s; pause by hovering.
Jewellery · Retail01 / 10
Pandora
Danish jewellery group, world's largest jeweller by volume, with a global retail and digital footprint.
- HQ
- Copenhagen, DK
- Founded
- 1982
- Size
- 27,000+
- Website
- pandora.net ↗
Role
Dec 2024 — present
Lead Engineer · Engraving / Bracelet Editor
- Lead the Engraving microfrontend embedded across pandora.net
- Ship the Bracelet editor microservice — drag-and-drop charm composer
- Diamond-material recipe (MeshRefractionMaterial + IBL) used on the homepage demo
- Partner with Styling Studio + Group platform on design-system primitives
Group platformshared editor primitives across Engraving, Styling, and Bracelet teams
- React
- Next.js
- Three.js
- GLSL
- Microfrontends
- Module Federation
01 / 10
Selected work · case studies
Three I’m proudest of.
Out of sixteen roles, these are the three with full case studies — the ones where I owned the most of the surface, and the work still teaches me things.
Areuin
Read →Solo full-stack landing for a digital sports book. Custom canvas engine, AE-driven hero. $200K+ in revenue from investor and client interest.
GatsbyCanvasWebGLAfter Effects
DentalVIP
Read →Firestore-driven template engine — one template, 200+ pages, multi-locale, lazy-loaded blocks. Cut infra costs by ~$30K.
GatsbyFirebaseReactImgix
Mallplaza
Read →Led the microfrontend split serving 5,000+ pages across 7 squads. ~$200K/yr saved on builds.
GatsbyMicrofrontendsContentfulGCP
What I do · in practice
Six things I get hired for.
02
Systems & architecture
Microfrontends, clean architecture, runtime composition. Led Gatsby-themes splits at Mallplaza and a framework-agnostic system at FactoryFix; built CI/CD that turned 18-minute deploys into two.
MicrofrontendsModule FederationClean architectureGitLab CIKubernetes
03
3D, WebGL & shaders
Three.js, R3F, GLSL, custom canvas engines. Diamond rendering at Pandora, polygon-packed sprite engine at Areuin, 3D bin-packing visualiser at PIC Cargo.
Three.jsR3FGLSLWebGLCanvas
04
AI on the edge
ONNX Runtime in workers, transformers.js, RAG with pgvector, prompt evals. The model lives in the tab, not the bill.
ONNXtransformers.jsRAGEmbeddingsPrompt evals
05
Cloud & .NET
Cross-stack since DHL: React + .NET on Azure, AWS Lambda at Rakuten, Firebase at DentalVIP. Polyglot enough to keep teams unblocked when the tickets cross stacks.
AzureAWS Lambda.NETKotlinFirebase
06
Mentorship & teaching
Taught 300+ students at Coderhouse, mentored teams at Mallplaza and Squidred until tech leads were in place, run technical interviews and AdpList 1:1s.
AdpListCoderhouseCode reviewTech interviews
/now · May 2026
What I’m on this month.
Inspired by Derek Sivers’ /now page. Updated when life updates.
Shipping
- 01Pandora — Engraving microfrontend & Bracelet editor
- 02Squidred — client MVPs and code surgeries
- 03This portfolio — Next.js + Vercel rebuild
Learning
- 01WebGPU — moving the segmentation pipeline off WASM
- 02Apple’s spatial UI primitives
- 03Unreal Engine C++ — for fun, not for hire
Reading
- 01Designing Data-Intensive Applications — Kleppmann
- 02The Hundred-Page Machine Learning Book — Burkov
- 03Atomic Habits — Clear
A line I keep on my desk
Do not let your fire go out, spark by irreplaceable spark, in the hopeless swamps of the not-quite, the not-yet, and the not-at-all.
Ayn Rand · Atlas Shrugged
Get in touch
Let’s build something.
Available for product engineering, AI integrations, frontend architecture audits and the occasional 1:1 mentoring session. I answer email within a day, two if I’m hiking.