CV

Available for full-stack & backend roles

Full Stack EngineerBackend depth. Modern UI. AI-native.

I'm César Velázquez— I design and ship production systems: scalable APIs, thoughtful data models, and interfaces that feel like real products. Growing frontend craft with the same rigor I bring to backend architecture.

Focus
Backend & APIs
Stack
TS · Node · PG
Edge
AI workflows
cesar@prod — zsh

Case Studies

Production systems, not side projects

Each project is documented like an engineering product: architecture, trade-offs, and lessons from shipping real software.

bookamenities.comScheduler
MonTueWedThuFriSatSun

Whole-day · multi-amenity · conflict-safe

production
fullstack

Scheduler — Shared Space Booking

Production web app for booking shared amenities and rooms: monthly calendar, whole-day reservations, multi-amenity selection, conflict prevention, and admin-controlled access — live at bookamenities.com.

  • React SPA (Vite) with dashboard and admin surfaces
  • Express authentication API with session-based access control
ReactTypeScriptViteTailwind CSSExpress

Role: Full Stack Engineer — product UX, booking logic, auth API, admin workflows

VasectomInfo
ENES

Clear, evidence-based education—without fear or myths

99%+

Effective

15–30m

Duration

Outpatient

Setting

Myths vs realityFind clinics
production
frontend

VasectomInfo — Evidence-Based Health Education

Production bilingual (EN/ES) education platform that explains vasectomy clearly—myths vs. reality, procedure steps, recovery, Mexico & U.S. access, and FAQs—without fear-based messaging.

  • Long-form educational sections with scannable myth/reality patterns
  • Bilingual navigation (EN/ES) across the full content surface
ReactTypeScriptTailwind CSSNext.js

Role: Full Stack Engineer — information architecture, UI, content structure, i18n

Simple ReactTutorial interactivo

ComponentesEstadoEventosAPIsHooks
medium
frontend

Simple React — Interactive Learning Surface

Production-grade interactive tutorial that teaches React fundamentals through live examples, progressive disclosure, and accessible UI patterns.

  • Lesson-driven routing with isolated example sandboxes
  • Composable demo components with shared theme tokens
ReactViteCSS Modules

Role: Frontend Engineer — UX, component architecture, content structure

$ npx next dev

▸ API playground ready

▸ ⌘K command palette

▸ MDX engineering notes

production
fullstack

Engineering Portfolio Platform

This site — a production portfolio with API playground, GitHub integration, MDX engineering notes, and AI showcase sections built as a cohesive product.

  • Feature-based Next.js App Router modules
  • Server actions + route handlers for integrations
Next.jsTypeScriptPrismaPostgreSQLFramer Motion

Role: Full Stack Engineer — system design, UI platform, integrations

Engineering Stack

Depth across the full stack

Skills represented by production readiness—not percentage bars. Each category reflects how I ship and operate real systems.

Backend

APIs, data modeling, and production service design

  • Node.jsShip independently
  • TypeScriptShip independently
  • PostgreSQLShip independently
  • PrismaShip independently
  • REST API DesignShip independently
  • Authentication & SessionsProduction-ready
  • Message QueuesProduction-ready

    Bull, event patterns

  • Caching StrategiesProduction-ready
  • AWS ConceptsProduction-ready

    ECS, S3, RDS, IAM

  • System DesignExpanding depth

    Active focus area

Frontend

Modern React surfaces with performance and accessibility

  • ReactShip independently
  • Next.js App RouterShip independently
  • Tailwind CSSShip independently
  • State ManagementProduction-ready

    Zustand, React Query

  • Responsive DesignShip independently
  • AccessibilityProduction-ready
  • Framer MotionProduction-ready
  • Component ArchitectureExpanding depth

AI / Automation

Practical AI integration in real product workflows

  • OpenAI APIsProduction-ready
  • AI WorkflowsProduction-ready
  • Prompt EngineeringProduction-ready
  • EmbeddingsProduction-ready
  • RAG PatternsExpanding depth
  • AI-Assisted ToolingShip independently

    Cursor, agentic dev

DevOps / Infra

Shipping, observing, and operating production systems

  • DockerProduction-ready
  • CI/CDProduction-ready
  • VercelShip independently
  • MonitoringProduction-ready
  • Structured LoggingProduction-ready

Backend Showcase

Live API playground

Execute real route handlers against this Next.js deployment. Inspect latency, headers, and structured responses—the way you'd debug production APIs.

// Auth flow (demo)

Client → API Gateway → JWT validate

→ Service token → Worker queue → Provider

GET /api/playground/health

Request

// No body

Response

// Hit Send request to inspect live handler output

AI Engineering

AI-native workflows in production

Practical integrations—not demos for demos' sake. Embeddings, structured pipelines, and developer tooling that ships with the product.

Semantic Engineering Notes

Embedding-powered search across MDX engineering posts with relevance-ranked results and snippet highlighting.

Embeddings
Semantic search
MDX content pipeline

Structured Prompt Pipeline

Multi-stage prompt workflow with validation, context injection, and output normalization for reliable AI responses.

Prompt templates
Guardrails
Output parsing

Development Copilot Patterns

AI-assisted refactoring and codegen workflows integrated into day-to-day engineering with review checkpoints.

Agentic workflows
Code review assist
Test scaffolding

Portfolio Command Search

Global command palette with fuzzy navigation across projects, skills, blog posts, and API playground actions.

Fuzzy search
Keyboard UX
Action routing

Prompt pipeline simulator

Semantic search demo

Query engineering notes (client-side fuzzy demo; production uses embeddings + vector store).

  • // Results appear here

Open Source

GitHub activity

Live repository data—cached at the edge, presented as an engineering dashboard, not a widget embed.

Contact

Let's build something production-grade

Startup, fintech, AI company, or client project—send a message. This form persists to PostgreSQL when configured.

Available for opportunities
contact-cli v1.0

$ contact --init

> Awaiting your message…