Jesus Moreno

Freelance Senior Full Stack Product Engineer

When you need someone with deep technical expertise to move fast, build your MVP, or unblock your team, I'm your guy. I help startups and technical founders get to market quickly with high-quality code.

⚡ Fast MVPs & prototypes
🧩 Solving tough technical blockers
🧑‍💻 Team mentorship & coaching

Available for 10-20 hour/week engagements. No long-term commitments required.

What I can do for you

AI tooling and integration

LLM code execution, MCP servers, Claude/GPT integration. Build systems that let AI do the heavy lifting. Architecture and implementation.

Rapid prototyping and MVP development

Get your MVP or proof-of-concept built in 2-4 weeks. Focus on iteration speed and getting something in users' hands fast.

AI Prototype Cleanup

Built something fast with AI but need it production-ready? I take vibe-coded prototypes and MVPs and turn them into maintainable, scalable systems. Proper architecture, comprehensive testing, and documentation. Keep the momentum, add the engineering discipline.

Technical consulting

Architecture decisions, code reviews, unblocking complex problems. TypeScript, React, API design.

Team coaching

Teach your team better patterns, faster feedback loops, and how to ship without technical debt. Usually 4-8 week engagements.

Why work with me

9 years shipping production software

First frontend hire at a SaaS startup (joined pre-Series A, left at Series A). Architected and built the frontend for V2 platform, established their design system before they hired a designer, and built multiple product modules from scratch. Mentored engineers who went on to ship features using the patterns and architecture I established. Five years consulting across fintech, pharma, and real estate.

AI-native development

I use AI to accelerate my work and can teach your team to do the same. Setting up Claude Code, choosing the right MCP servers for context management, building Lootbox workflows, prompt engineering fundamentals - I'll show your team how to ship faster.

Low overhead, high output

I figure things out and deliver. Updates are async, meetings are minimal, and you get production-ready code.

Quality without compromise

Type-safe architecture, comprehensive testing, maintainable code. Built to last from day one.

I work best with founders who move fast

We figure out the problem and approach together, then I go execute. Updates are async, you stay informed, we ship fast.

If you need someone in meetings all day or want daily standups, I'm not your fit.

Founders racing against market windows: You've validated demand and need to ship before competitors catch up. You need fast execution from someone who operates independently.

Technical founders who need a force multiplier: You can code, but you're also CEO/CTO/head of sales. You need someone who figures things out independently while you're fundraising, hiring, or building the next feature.

How we'll work together

Initial call (30 minutes)

Understand your needs, share my approach, agree on timeline.

Start shipping

Quick ramp-up, then consistent delivery. Async updates keep you informed.

Ready to build on

Documented, tested code your team can extend.

Open Source

Lootbox

Give your LLM a code sandbox. Let them write scripts to orchestrate MCP servers, call APIs, and interact with the web. Save successful runs as reusable workflows for later.

Quick Notes (QN)

Capture thoughts from the command line and get perfectly-tagged markdown notes. Create NLP-powered tagging rules once, then every note you take gets automatically organized. Great for feeding your Obsidian vault (or any markdown-based system) without manual tagging.