Legacy modernization
Domain separation, explicit contracts, gradual migrations, and decisions that respect the business already running.
Java, Spring, domain services, integrations, and controlled technical debt.
Architecture, product, and execution
Currently Head of Architecture at Lakaut
I design and modernize real systems: digital signatures, identity, external integrations, Java legacy, Next.js, PostgreSQL, and AI automation.
Architecture
digital signatures, identity, integrations
Leadership
code review, mentoring, standards
Full Stack
Next.js, Java, PostgreSQL, Docker
AI Engineering
LLMs, agents, automation
Where I create leverage
I do not sell hours: I reduce technical risk and speed up hard decisions.
My edge is connecting architecture, development, infrastructure, and product when teams need to modernize without breaking production.
Product architecture
Stack decisions, security, scalability, DX, technical documentation, and explicit trade-offs.
Current experience making cross-cutting architecture decisions.
AI applied to real workflows
LLM automations, internal pipelines, human-approved agents, and tools that help teams ship.
Content systems, audits, assisted generation, and human-in-the-loop flows.
Senior full stack execution
Internal products, dashboards, auth, APIs, databases, and production frontend with operational judgment.
Next.js, React, TypeScript, PostgreSQL, Prisma, Docker, and Railway.
Featured cases
Public evidence of how I think and build.
These projects show architecture, security, tooling, product judgment, and the ability to finish usable software.
GreenGate
Human-approved agents with Auth0 CIBA and Gemini. The agent proposes, the phone approves before data changes.
Auth0 CIBAGeminiNext.jsPostgreSQL
DEV Weekend Challenge winner: Best Use of Auth0 for Agents.
Post-Quantum Signing
Software HSM with ML-DSA and SLH-DSA to explore post-quantum digital signatures through a swappable interface.
TypeScriptML-DSASLH-DSACrypto-agility
Benchmark and migration pattern for modern keys and signatures.
juanchi.dev
Personal full-stack platform with CMS, admin, analytics, auth, bilingual content, and AI-assisted generation.
Next.js 16PrismaPostgreSQLRailway
A real production system, not a template or static landing page.
CertView / X.509 tooling
Tooling for inspecting certificates from VS Code and JVM apps, connecting security, DX, and infrastructure.
TypeScriptVS Code APIX.509Kotlin
Public tools for concrete technical workflows.
Recent recognition
GreenGate won Best Use of Auth0 for Agents
DEV selected GreenGate in the Weekend Challenge: Earth Day for using Auth0 CIBA to keep a human in the loop: the agent proposes an action, and phone approval is required before data changes.
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JOURNEY
30+ years of tech evolution
2020s
Dev, Lead, Architect & AI
Mostrando 12 de 12 eventos
2020The Big Pivot: Software Dev
2021Java Backend Developer
2022Full Stack & the React Ecosystem
2022Docker & DevOps Pipelines
2023Open Source & VS Code Extensions
2023Head of Development
2023Freelance & Side Projects
2024AI Engineering & LLMs
2024Continuous Learning
2025juanchi.dev — Personal Brand
2026GreenGate Wins DEV Weekend Challenge
2026Software Architect
Skills Network
Connections between technologies and areas of expertise
frontend
backend
devops
ai
architecture
leadership
tools
education
projects
certifications
work
LAB
Lab & Open Source
Real projects, not toy demos. Published extensions, open-source repos, CLIs and technical experiments. All on GitHub, all auditable.
Exp #00
Bondi Sonoro
Next.js 15Tone.js PluckSynthAPI Transporte GCBA
20TypeScript20d
Explore→
Exp #01
AMBA Trenes Sonoros
Next.js 15Tone.jsGTFS
7TypeScript20d
Explore→
🧠
const ai = await llm(prompt)
Exp #01
Browser LLM
@huggingface/transformersWeb WorkersNext.js
0kbTypeScript27d
Explore→
deps
400MB
builder
800MB
runner
150MB
Exp #02
Docker Next.js Starter
DockerNext.jsPostgreSQL
~150MBDockerfile27d
Explore→
🐢 Lento1800ms
⚡ Rápido300ms
Exp #03
Next.js 3s to 300ms
Next.js 15App RouterServer Components
~1800msTypeScript27d
Explore→
type PostStatus =
✏️{ status: "draft" }
⏰{ status: "scheduled" }
✅{ status: "published" }
📦{ status: "archived" }
Exp #04
TypeScript Patterns
TypeScript 5.7Result<T,E>Type Predicates
9TypeScript24d
Explore→
🔒certificate.pem
CNjuanchi.dev
SAN*.juanchi.dev
IssuerLet's Encrypt R3
Expires2025-09-14
Exp #05
CertView
TypeScriptVS Code Extension APINode.js
PEM, CRT, CER29d
Explore→
⚙️haproxy.cfg
frontend
bind *:443 ssl
default_backend
backend api
server s1 :3000
Exp #06
HAProxy for VS Code
TypeScriptVS Code Extension APITextMate Grammar
40+ rules28d
Explore→
Exp #07
Secure RSA + AES Chat
JavaBouncyCastleRSA 2048
4Java418mo
Explore→
Exp #08
X.509 Certificate Viewer
KotlinJVMX.509
PEM, CRT, CER, P12Kotlin1mo
Explore→
Exp #09
init-dev-tools
BashShellIdempotent Scripts
1Shell123mo
Explore→
Exp #10
One More Day in Ragnarok
HTML5 CanvasJavaScriptGame Loop
~48h66mo
Explore→
Signature size comparison
ECDSA P-25664B ❌
ML-DSA-442420B ✅
ML-DSA-653309B ✅
SLH-DSA7856B ✅
Exp #11
Post-Quantum Signing
TypeScript@noble/post-quantumML-DSA (FIPS 204)
6TypeScript24d
Explore→
📊 Lab Stats
0
Projects
0
Open Source
0
Languages
🛠️
Let's collaborate
Everything is open source. Open an issue, send a PR, or reach out if you want to collaborate on something I'm building.
LET'S TALK
Architecture, technical consulting, full-stack products, or senior opportunities.
Available for selected projects and serious career conversations
Send me a message
También podés escribirme directamente a [email protected]