02 · ABOUT

I build AI systems that run at scale. And I document everything.

I'm Cristhian Fonseca — a Technical Lead with 4+ years architecting cloud-native platforms that serve millions of users.

Right now I lead the engineering of a digital credit marketplace integrated into a major telecom's Super App — serving millions of underbanked users across LATAM. Cloud-native infrastructure on AWS, fully automated provisioning, zero-paperwork loan processing.

I specialize in agentic AI systems — MCP agents, multi-step LLM pipelines, and automation architectures that handle real data volumes with real cost constraints. Every system I publish is first deployed in production.

I believe the best engineers don't just write code — they build systems that compound. And they share what they learn.

EXPERIENCE

  1. 2026

    Anthropic Certified — Claude Code in Action

    Production-grade AI engineering certification. First LATAM cohort.

  2. 2024 — present

    Technical Lead · Digital Credit Marketplace

    Millions of users across LATAM. Cloud-native AWS infra.

  3. 2023

    Cloud infrastructure for US startups

    Fully automated provisioning, zero-paperwork pipelines.

  4. 2020

    Entered FinTech

    Shipping high-availability payment systems from day one.

CORE STACK

AI & Automation

LLMs, Claude API, MCP Protocol & Agents, Agentic Workflows, Prompt Engineering, Generative AI, Neural Networks, Workflow Automation

Cloud & DevOps

AWS (CDK, Lambda, RDS, S3, Cognito, CloudWatch, EC2, SES, SNS, API Gateway, Route 53, ElastiCache), Docker, CI/CD, Nginx

Full Stack

Python, TypeScript, JavaScript, Java — FastAPI, Angular, Django, Spring Boot, NestJS, Node.js, Flutter — PostgreSQL, MongoDB, Redis

WHY I BUILD IN PUBLIC

Most engineers keep their best architecture decisions private. I think that's backwards. When I ship something that works, I document it and publish it. The community makes me better.

This isn't hypothetical. Every automation template in PowerAI was first deployed in a real system. Every architecture diagram was drawn after the code ran in production.

If you're building with AI, I want to hear what you're solving. The best ideas in this newsletter come from conversations with engineers who are actually shipping.

EDUCATION & CERTIFICATIONS
Claude Code in Action·Anthropic (2026)B.Eng. Systems Engineering·UNAB — BucaramangaNeural Networks and Deep Learning·Coursera / deeplearning.aiAWS Partner: Technical Accreditation·Amazon Web Services

Building with AI at scale? Let's connect.

Always open to connecting with founders, CTOs, and engineers shipping ambitious products.

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