I build FinTech at scale.
And AI automations on the side.

I'm Cristhian Fonseca — a Technical Lead with 4+ years architecting cloud-native FinTech 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.

In parallel, I'm building at the intersection of AI and infrastructure — MCP agents, agentic workflows, and automation systems. Every week I publish a production-ready template with architecture diagrams, cost breakdowns, and working code.

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

CORE STACK

Cloud & DevOps

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

AI & Automation

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

Full Stack

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

EXPERIENCE

Technical Lead

Prosperas

2025 — Present

  • ·Leading architecture of a FinTech credit marketplace inside a major telecom Super App
  • ·Serving millions of underbanked users across LATAM with zero-paperwork loans
  • ·Multi-environment cloud-native infra using AWS CDK (RDS, S3, Lambda, Cognito, ElastiCache)
  • ·Optimized analytical queries across 2M+ records — cut dashboard load times and costs
  • ·End-to-end CI/CD pipelines and DevOps-first engineering culture

Full-Stack Developer

eSoluzion (Banking Consulting)

2022 — Present

  • ·Architected end-to-end modules for enterprise banking systems with regulatory compliance
  • ·Built dynamic, responsive banking interfaces improving usability across core modules
  • ·Cross-functional collaboration with product owners and QA engineers

Lead Developer

ImkGlobal

2024 — 2025

  • ·Led development team driving technical decisions, architecture, and sprint planning
  • ·Cross-platform mobile/web applications using Flutter for government-backed services

Software Engineer

Dualboot Partners

2022 — 2023

  • ·Designed and deployed cloud services on AWS for a US-based platform
  • ·Serverless architectures using AWS Lambda and Chalice, automating data flows
  • ·High-availability infrastructure: EC2, Route 53, API Gateway

Data Analyst / Full-Stack Developer

Accenture

2021 — 2022

  • ·Interactive Power BI dashboards integrating SQL Oracle and MongoDB sources
  • ·Java (Spring Boot) backend services for banking infrastructure
  • ·Full-stack features using the MEAN stack

EDUCATION & CERTIFICATIONS

B.Eng. Systems Engineering—Universidad Autonoma de Bucaramanga (UNAB)Claude Code in Action—Anthropic (2026)Neural Networks and Deep Learning—Coursera / deeplearning.aiAWS Partner: Accreditation (Technical)—Amazon Web Services

Fellow builder? Let's connect.

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

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