Eric GuimarãesCV
Eric GuimarãesBelo Horizonte, BRAvailable

Eric Guimarães

Full-stack & AI engineer. Building Magoquiz solo — magoquiz.com.

I founded and run Magoquiz, a profitable recommendation-quiz SaaS for LATAM e-commerce — 46 paying stores, R$2.1K MRR, 128k respondents — handling product, architecture, integrations, and support myself.

Before that I spent three years at SYDLE on a 6-person scrum team, growing from trainee into the technical point of contact between engineering, product, design, and execs. I've shipped legacy refactors, multi-tenant rewrites, and SEO programs that drove millions of organic impressions.

Right now I'm focused on the seam between product engineering and AI: production LLM/RAG pipelines, agent workflows orchestrated with Claude Code, and the systems work that turns models into products.

Email meDownload CVGitHubLinkedIn

/ Work

Magoquiz

Recommendation-quiz SaaS for LATAM e-commerce. 46 paying stores, R$2.1K MRR, 128k respondents. SvelteKit on Cloudflare Workers, Django/Celery/Redis, Stripe, PostHog.

SvelteKit · Cloudflare Workers · Django · Stripe · PostHog

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Founder · 2024 — Present

Rede Doglife

Pet-healthcare aggregator built ground-up. Scaled to 60k SEO-optimized pages across 5k cities, driving 1M+ monthly organic impressions.

Angular · Node.js · SEO · Multi-tenant

Visit

Sole engineer · SYDLE · 2021 — 2023

PetLife

Pet-care platform built end-to-end during my time at SYDLE — concept through deployment.

Full-Stack · TypeScript

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Full-stack · SYDLE

/ Selected projects

Multi-model LLM comparison for recommendation

Comparative study across providers (Gemini, GPT) and architectures (single-shot LangChain vs. multi-step LangGraph + RAG) applied to e-commerce recommendation quizzes. Scientific method, statistical analysis.

LangGraph · LangChain · RAG · Gemini · GPT

Bachelor's thesis (TCC) · 2025

BlockFace

Tamper-proof surveillance system on a custom blockchain (Python + Go). Awarded Best of Semester with a monetary prize.

Blockchain · Python · Go · Computer Vision

PUC Minas · 2024 · Best of Semester

Liver Analysis

Medical-image classifier using a custom CNN with reinforcement-learning principles (Python + Streamlit). State-of-the-art results; submitted for academic publication.

PyTorch · CNN · Reinforcement Learning

PUC Minas · 2024 · Submitted for publication

Astral Intelligence

Personalized AI mobile app (Flutter) using RAG over a Supabase vector store, served through a custom reverse proxy.

Flutter · RAG · Supabase

PUC Minas · 2023

/ Experience

2024 — Present
Remote

Founder & Software Engineer · Magoquiz

  • 47× ROI and +236% conversion lift in 10 days for a strategic client, via an OAuth 2.0 (PKCE) + webhooks integration with Yampi, Resend, and PostHog.
  • Polyglot microservices ecosystem — SvelteKit on Cloudflare Workers (edge), Django/Celery/Redis (async integrations), Node.js (OAuth tokens), and n8n + Claude Code (workflows) — serving 30k requests/day with 1.5+ years of zero customer-facing regressions.
  • Programmatic-SEO pipeline (SvelteKit + custom CMS + DataForSEO + Google Search Console MCP, orchestrated by Claude Code agents) producing 2,500+ audited posts and a +300% lift in organic impressions.
  • Nine integrations (Yampi, Nuvemshop Nexo SDK, Resend, PostHog, GTM, Facebook Pixel, Stripe) on top of reusable OAuth + webhook abstractions — ~70% less time per new integration.
  • AI outbound pipeline: Clay (320 ICP contacts enriched) + Claude Code (fit scoring) + auto-generated demo quiz per prospect — 236 DMs sent, 9% reply rate.
  • Rewrote the PostHog analytics layer (75+ typed events, group analytics, 5 dashboards); migrated Stripe webhooks to server-side tracking.
  • 230+ tests across unit, integration, and Cypress E2E plus a CI/CD pipeline that lets me ship fast without breaking things.
2020 — 2023
Belo Horizonte, BR

Full-Stack Developer · SYDLE

  • Three years on a 6-person scrum team (PM, designer, QA, engineers). In the final year I was the primary technical point of contact between engineering, product, design, and execs.
  • Scoped and disambiguated 100+ tickets with product, design, and QA across legacy and greenfield codebases.
  • Mentored and onboarded 3 engineers; led code reviews and architectural guidance.
  • Established CI/CD across 3 environments with the DevOps team — fewer deploy errors, shorter delivery loop.
  • Sole engineer on Rede Doglife (pet-health aggregator), in a tight loop with the CEO and design — scaled to 60k SEO-optimized pages across 5k cities, generating 1M+ monthly organic impressions.
  • Refactored a legacy Angular/TypeScript checkout — 80s → 30s (–62%) and eliminated recurring crashes. Tuned 30+ Elasticsearch queries for 50% lower latency.
  • Led full-stack SEO across 200+ legacy pages, lifting Lighthouse from 50 to 90 (+80%) in one month.
  • Refactored the backend (20+ queries, endpoints, functions) into multi-tenant / white-label, enabling launch of a second brand on the same codebase.

/ Toolbox

Languages
Python · TypeScript · JavaScript · Node.js · Go · Java
Frontend
Svelte · SvelteKit · React · Next.js · Angular · TailwindCSS
Backend
Django · Celery · FastAPI · REST · GraphQL · Redis
Data
PostgreSQL · Supabase · Elasticsearch · MongoDB
AI / LLMs
OpenAI · Anthropic (Claude Code) · LangChain · LangGraph · RAG · PyTorch · TensorFlow · Computer Vision
Cloud / DevOps
AWS · Cloudflare Workers · Vercel · Docker · CI/CD · n8n · Trigger.dev
Integrations
OAuth 2.0 (PKCE) · Webhooks · Stripe · PostHog · Google Analytics · GTM · Facebook Pixel
Quality
Cypress · Vitest · E2E · Storybook
Languages
PortugueseNative·EnglishC1 — Fluent·MandarinB1·SpanishA2
Education
BSc, Computer Science·PUC Minas2022 — 2025
Technical High School, Systems Development·COLTEC / UFMG2018 — 2021

/ Contact

I'm looking for senior roles that combine end-to-end product architecture, close cross-functional collaboration, and measurable business impact. The fastest way to reach me is email — happy to chat about LLM systems, SaaS, or anything in between.

Email
ericmfgui@gmail.com
LinkedIn
linkedin.com/in/ericmfgui
GitHub
github.com/mifegui
CV
PDF — eric-guimaraes-cv.pdf