Francisco
Castellanos
I build production platforms and agentic AI systems — multi-tenant marketplaces on AWS with React/Angular front-ends, Java & C#/.NET back-ends, and LLMs embedded across product and workflow.
✦tailor my cv for a role with AI →❯ about
theme: light
I started in process engineering — mapping how real systems actually work — and moved into software to build them. Today I design and ship full-stack platforms and agentic AI systems in production.
That path shows up in how I work: I care about the whole loop, from cloud infrastructure to the interface a human touches — and lately, to the tools an agent calls. Ten-plus years across consulting, engineering and AI, with a bias for ownership and small teams.
❯ experience
Senior Full-Stack & Agentic Engineer · HK Tech
nov 2025 — presentDesign and ship multi-tenant staffing marketplaces on AWS (ECS/Fargate, RDS, S3) with Java 21 / Spring Boot and React 19. Embed LLM features — matching, employer verification, CV parsing — and operate a Claude Code + OpenSpec agentic dev flow with Jira/GitHub MCP and AI-powered PR review.
Software Developer · AudioEnhancement
nov 2024 — nov 2025Built a GoLang API on AWS EC2/RDS, configured Lambda + CloudWatch monitoring that cut outage response time 40%, implemented SSO with Cognito/Amplify, and scaled the platform to 2,500+ schools and 60,000+ users.
Full Stack Developer · XLMedia PLC
may 2022 — nov 2024Refactored legacy monoliths into serverless microservices (Node.js + AWS Lambda), cutting infra cost 25%. Built REST microservices across AWS and GCP with React front-ends, and managed Docker/Kubernetes CI/CD and MongoDB Atlas.
Sr Consultant & Software Developer · Kreios
may 2018 — may 2022Delivered insurance policy-administration systems in C#/.NET with SQL Server on AWS for AXA XL; built scholarship and course-equivalence platforms for Aliat (52 campuses, 12k students) using MEAN, OCR (Google Vision) and AI course assignment; a document-recovery platform via SMS/email/WhatsApp; an AXA NLP chatbot; and RPA automations (UIPath).
Senior Process Business Consultant · Stratis
sep 2016 — may 2018Led the business-analysis division for the XL Insurance Mexico account: mapped operating departments, produced 120+ BPMN flow diagrams, and identified 250+ process- and automation-improvement opportunities through lean analysis.
Change Agent — WoW Navigator · AIG
nov 2013 — may 2016Drove operational transformation across underwriting, marketing and transactional teams in the US and Latin America — running diagnostics, process mapping, standard operating procedures and structured problem-solving workshops across four initiatives. The systems-first origin of my approach to software.
❯ projects
> 9 resultsp1-aws-ops-assistant
A conversational CLI that answers natural-language questions about your AWS infrastructure via Claude tool-use — a hand-rolled agentic loop over the Anthropic SDK + boto3.
CareForce
Healthcare staffing marketplace connecting licensed professionals with facilities for short shifts. Java 21 / Spring Boot + React 19 + PostgreSQL on AWS, with Stripe Connect.
MaidNDemand
Two-sided cleaning-services marketplace with direct bidding, live SSE updates, background checks and payments. The flagship build: 500+ PRs and MCP-driven tooling.
Intern-n-Demand
Internship marketplace hardened with stateless JWT RS256, plus in-product AI: employer verification, matching and CV parsing with OpenAI.
clockify-automation
A published PyPI CLI that syncs Jira “In Progress” activity into Clockify time entries. Typed Python with mypy --strict, multi-OS CI and Dependabot.
Finvisors Economic Model
Multi-tenant financial-planning platform for staffing firms — recruiter rosters and ramp curves into P&L, margin and commission projections. Reactive Spring WebFlux + React.
Personal Library Manager
Catalog a home library manually, by ISBN/barcode, or by AI photo analysis of your shelves (Gemini/OpenAI). Next.js + Express + Firestore on Cloud Run.
Comunidad Chirimoyo
Public-outreach sites defending the Chirimoyo wetland in Veracruz, with a resident/migratory bird catalog. Next.js + Flask + Firestore on Cloud Run.
Sociedad Salvaje
A reading/film-club platform with a paid virtual club. Next.js + Flask + Firestore on GCP, Stripe/MercadoPago payments, and an AI agent service that drafts social content.
❯ how I actually build
Spec-driven and AI-native: OpenSpec change proposals reviewed before any code, architecture decisions captured as ADRs, and UI/UX designed with AI — then agentic implementation with AI PR review and evals gating every merge.
❯ skills
❯ core stack
❯ ai / agentic
❯ data & devops
❯ certifications
❯ contact
Let's build something that ships.
Open to senior full-stack & agentic engineering roles. Say hi below.