Marcos E.

I build software and automation systems that move real money and replace real headcount. My recent work includes rebuilding the backend vehicle registration fee calculation engine used across all 50 US states for a major DMV processing platform, shipping AI agents for venue research and outbound sales using Anthropic and OpenAI APIs, and building Stripe Connect payment infrastructure for a digital advertising company.
What I do most often:
Backend systems in Python and Node.js, including REST APIs, data pipelines, and calculation engines with heavy business logic.
AI and LLM automations using Claude, GPT, and open-source models. This covers agent workflows, retrieval systems, document processing, content generation, and integrations into existing tools like HubSpot, Slack, and Gmail.
Workflow automation across the standard stack: Zapier, Make, n8n, custom Python scripts, scheduled jobs, webhook plumbing, and CRM integrations.
Payment and platform infrastructure with Stripe, including Connect for marketplace flows, subscription billing, and balance management.
I also run my own companies, which means I understand budgets, deadlines, and what software is actually for. Clients hire me when they want someone who will push back on the spec instead of just shipping whatever was asked for.
If you have a process that runs on copy-paste, a system that needs to talk to another system, or an idea for an AI agent that does something useful, send me a message and tell me what you're trying to accomplish. I'll tell you honestly whether it's a one-day job, a one-month job, or whether you don't need software at all.