Open to technology lead and senior full stack roles (remote)

    Hi, I'm JavierTechnology & AI Lead · Senior Full Stack · AI First

    Javier Castro — Technology & AI Lead · Senior Full Stack · AI First

    7+ years shipping software to production, working with Claude, MCP, Next.js & Spring Boot.End-to-end ownership: architecture → release → operations.

    Microservices on OpenShift, ERP and e-commerce integrations, and AI agents wired into real systems.

    Trusted by teams at

    Farmacias Guadalajara · 3,000+ stores · Mexico's largest pharmacy retailer

    Technical leadership that wires AI into production systems

    I own technology end to end — architecture, delivery and operations — with AI built into the process.

    I'm a senior full stack developer and technical lead with 7 years of experience taking software to production end to end. At Farmacias Guadalajara I lead the migration of 57 Java/Spring Boot microservices to Red Hat OpenShift with GitOps. In parallel I run the technology of my own agency, Aspecto Creativo, as the sole owner, with 8 active clients: I integrate ERP and commerce platforms (Odoo, Salesforce Commerce Cloud), automate processes with n8n and Power Automate, and build AI agents and MCP servers that connect models like Claude to real systems. I use AI every day to build, with clear human-review criteria.

    • 7+

      Years shipping to production

    • 12+

      Projects in production

    • 8

      Active clients

    • 57

      Microservices migrated

    Languages: Spanish (native) · English B1 (intermediate)

    AI First

    AI applied to real systems

    Not demos: agents, MCP servers and automations connected to production data and services.

    • Agents and MCP servers

      I build Model Context Protocol servers that let models like Claude query and operate my own services.

      MCPClaude
      See project
    • Chatbots over business data

      Stockwave: an assistant that answers about live inventory by querying the database through 12 typed tools, under the same permissions as the API and with failover between model providers.

      Vercel AI SDKGeminiGroqNestJSNext.js
      See project
    • Process automation

      n8n and Power Automate flows wiring forms, CRM, email and WhatsApp through webhooks, plus Odoo integrations.

      n8nPower AutomateOdooWebhooksWhatsApp Business API
    • AI-assisted development, with judgement

      I use Claude Code, GitHub Copilot, Codex and OpenCode every day. On critical projects I measured the effort reduction and defined what gets delegated to the model and what requires human review.

      Claude CodeGitHub CopilotCodexOpenCodePrompt Engineering

    The stack

    Day-to-day tools, grouped by domain and depth — from AI and automation to the platform that runs underneath.

    ExpertAdvancedIntermediate

    AI & automation

    • ClaudeAdvanced
    • Claude CodeAdvanced
    • Anthropic APIAdvanced
    • MCPAdvanced
    • AI AgentsAdvanced
    • Prompt EngineeringAdvanced
    • GitHub CopilotAdvanced
    • n8nAdvanced
    • Vercel AI SDKAdvanced
    • GeminiIntermediate
    • GroqIntermediate
    • CodexIntermediate
    • OpenCodeIntermediate
    • Power AutomateIntermediate

    Backend & integrations

    • JavaExpert
    • Spring BootExpert
    • REST APIsExpert
    • Node.jsAdvanced
    • NestJSAdvanced
    • FastifyAdvanced
    • WebhooksAdvanced
    • OAuth / JWTAdvanced
    • .NET / C#Advanced
    • KafkaIntermediate
    • MuleSoftIntermediate

    Platforms & business

    • WhatsApp Business APIAdvanced
    • OdooIntermediate
    • Salesforce Commerce CloudIntermediate
    • ConektaIntermediate
    • WebSphere CommerceIntermediate

    Frontend

    • TypeScriptAdvanced
    • ReactAdvanced
    • Next.jsAdvanced
    • AstroAdvanced
    • AngularAdvanced
    • React Native / ExpoAdvanced
    • Tailwind CSSAdvanced

    Cloud, DevOps & data

    • Red Hat OpenShiftExpert
    • PostgreSQLExpert
    • KubernetesAdvanced
    • DockerAdvanced
    • ArgoCDAdvanced
    • Azure DevOpsAdvanced
    • VercelAdvanced
    • SupabaseAdvanced
    • DNSAdvanced
    • MySQLAdvanced
    • SQL ServerAdvanced
    • AWSIntermediate

    Selected work

    AI products, integration platforms and production systems — with the outcome, not just the screenshot.

    Migration of 57 Java microservices to Red Hat OpenShift
    Platform / Backend57 microservices · 42 in QA

    Migration of 57 Java microservices to Red Hat OpenShift

    Technical lead on the migration of 57 Java/Spring Boot microservices to Red Hat OpenShift with GitOps delivery; 42 running in QA.

    Oct 2024·Farmacias Guadalajara
    JavaSpring BootRed Hat OpenShiftGitOps+1
    View case study →
    OptiCobro — billing SaaS for optical shops
    SaaS / Fintechv1.1.0 in production

    OptiCobro — billing SaaS for optical shops

    Vertical SaaS in production (v1.1.0) with a paying customer: automates corporate eyewear sales with instalment billing and tokenized payments.

    Jan 2026·Mundo de Lentes
    Node.jsFastifyPostgreSQLReact+2
    View case study →
    Stockwave — inventory with an AI assistant
    AI / Product12 tools · web and mobile

    Stockwave — inventory with an AI assistant

    A conversational assistant over live inventory data: 12 permission-aware tools, streaming on web and mobile, and failover between model providers.

    Apr 2026·Espresso Enchanters
    Vercel AI SDKGeminiGroqNestJS+7
    View case study →
    Architecture / pipeline diagram — coming soon
    Automation / Backend

    Multi-tenant lead capture platform

    A single backend behind every agency client's forms: Supabase, Edge Functions and Amazon SES, with one tenant per client.

    Jun 2024·Aspecto Creativo
    SupabasePostgreSQLDenoAmazon SES+1
    View case study →
    Cruz del Sur Automotriz — website and WhatsApp lead capture
    Automotive / Lead capture+40% conversions · −60% load time

    Cruz del Sur Automotriz — website and WhatsApp lead capture

    Pre-owned vehicle catalog with a financing calculator and direct lead capture over the WhatsApp Business API.

    Nov 2024·Cruz del Sur Automotriz
    WhatsApp Business APIAstroTypeScriptTailwind CSS+1
    View case study →

    Where I've shipped

    Building software end-to-end across pharmacy retail, industrial concrete, public-sector training and manufacturing.

    Download CV (PDF)
    Now

    Founder & Technology Lead

    Aspecto CreativoZapopan, JaliscoFeb 2023 — Present
    • Design, development and operation of the technology stack of 8 active clients as the sole technical owner, including vendor management (hosting, domains, email, cloud).
    • Odoo integrations over APIs and n8n automations wiring forms, email, CRM and WhatsApp through webhooks.
    • Multi-tenant lead capture platform: Supabase (PostgreSQL, Deno Edge Functions, triggers) and Amazon SES with one tenant per client; onboarding a new client is a single command.
    • In-house MCP servers that connect Claude to internal services, such as automated content publishing.
    • Own infrastructure: VPS running Kubernetes and Docker, with databases isolated per application.
    TypeScriptReactNext.jsAstroNode.jsSupabasen8nOdooMCPKubernetes
    Now

    Senior Software Developer

    Farmacias Guadalajara (Fragua)Guadalajara, JaliscoOct 2024 — Present
    • Technical lead on the migration of 57 Java/Spring Boot microservices to Red Hat OpenShift with a GitOps approach; 42 running in QA.
    • E-commerce integrations with Salesforce Commerce Cloud (SFCC), including an order integration with an idempotent design and accounting traceability.
    • Rolled out GitHub Copilot and Claude Code on critical projects, with measured effort reduction and clear human-review criteria.
    • Automations with Power Automate and an internal time-off management platform.
    • Go-to engineer for production incidents, mentoring and code reviews.
    JavaSpring BootOpenShiftGitOpsSFCC

    Software Developer

    Farmacias Guadalajara (Fragua)Guadalajara, JaliscoJul 2023 — Oct 2024
    • RESTful APIs with Spring Boot integrated with corporate systems and databases.
    • Corrective and evolutive maintenance of the corporate e-commerce platform: catalogue, database, interface components and log analysis.
    JavaSpring BootSQL

    Web Developer

    Forzac Concretos PremierGuadalajara, JaliscoOct 2022 — Jun 2023
    • Web and mobile applications with Angular and C#/ASP.NET on SQL Server and AWS.
    • Containerized services with Docker.
    AngularC#ASP.NETSQL ServerAWSDocker

    Web Developer

    IDEFT — Instituto de Formación para el TrabajoGuadalajara, JaliscoSep 2020 — Oct 2022
    • New modules for the institutional portal with Angular, PHP and MySQL.
    AngularPHPMySQL

    Web Developer / Head of Systems

    Emblemas 3D de MéxicoGuadalajara, JaliscoJun 2019 — Sep 2020
    • Custom Laravel + MySQL ERP covering sales, production and inventory.
    LaravelPHPMySQLJavaScript

    Academic background

    Formal education and continuous learning.

    Bachelor's Degree

    B.S. in Computer Systems Engineering

    Universidad Cuauhtémoc Plantel Guadalajara

    Sep 2018 — Dec 2022

    Technical Degree in Programming

    B.S. in Computer Systems Engineering

    CBTIS 246

    Aug 2015 — Jun 2018

    Certificates

    Frontend Developer Course Diploma

    2023

    What clients I've worked with say

    What clients say

    Real feedback from clients and partners I've delivered software, web and brand projects for.

    “The website, logo and branding were exactly what I was looking for to reflect my brand and the service I offer, from visuals and colors to brand voice. It's a service that helps me give my clients a clear vision of what working with me is like, and gives them the confidence of a transparent, quality service.”

    The advisor's follow-up is excellent — he offers options and helps you reach the vision you want for your brand, even if at first you don't know exactly how.

    XA

    Xochitl Alejandra González Rojo

    Website, Logo, Branding · Mar 2025

    “Excellent experience. This is the second website we've built with them and their service and care are unbeatable — we've gained several clients through it and it's helped us grow both businesses. We'll keep working together.”

    We like that they always propose improvements or services for the sites we have and that they help us project and grow the business

    YR

    YIRA RAMIREZ LOPEZ

    Website · May 2025

    “Outstanding — fast communication, on-the-spot changes and quick problem solving.”
    AC

    Alondra Cosilion

    Website · May 2025

    “Always available to answer my questions and adapted to exactly what I needed. The treatment was very professional but also warm — you can tell they care that you're satisfied.”

    The attention was incredible 10/10

    BM

    Brandon Maciel

    Website · Mar 2025

    “I'm very happy with my save the date — they understood exactly what I wanted and the result was beautiful. Highly recommended!”
    NB

    Natalia Berumen

    Wedding Website · Nov 2024

    “High end, perfectly meeting the needs of my objective. The time and investment paid off.”
    CP

    Claudio Perez Rangel

    Logo · Feb 2024

    “Excellent and very professional service — 10/10. They give professional follow-up at every step; we're very grateful for the service.”
    RG

    Raymundo Guerrero Reyes

    Website · Aug 2023

    “Very dynamic platform — friendly and professional, the service is always on time, very innovative and efficient. 10 out of 10.”
    MA

    Mario Aaron Torres Ramos

    Website · Jul 2023

    “Very attentive to the specifications I gave him to create my logo — minimalist, original and elegant.”
    NP

    Natnails Profesional

    Logo · Jul 2022

    Frequently asked questions

    The five things people ask most often before getting in touch.

    Have a project?

    Tell me the scope and I'll get back to you with an approach and an estimate. No commitment.

    Ready when you are

    Let's build your next backend platform together

    Available for senior backend / platform roles and selected freelance projects. Reply within 24h on weekdays.

    • Available for new projects
    • Remote worldwide · On-site GDL
    • Replies in <24h

    Based in Zapopan

    Zapopan, Jalisco, Mexico 🇲🇽 — Working from Zapopan, Jalisco · México — available on-site in the GDL Metro Area and remotely worldwide.
    Mon–Fri · 9:00–19:00 (GMT-6)On-site GDL · Remote worldwide