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johanguse/README.md

Hello!

I’m a full-stack engineer with over ten years of experience building digital products, scalable platforms, and user-focused applications.

More recently, my work has focused on artificial intelligence, real-time systems, and building products that turn emerging technologies into practical solutions. I’m also pursuing studies in Applied Artificial Intelligence, expanding how I approach automation, intelligent experiences, and complex product challenges.

Accessibility remains an important part of how I build software. I believe the web should be usable by everyone, and I aim to create products that are not only intelligent and capable, but also inclusive, intuitive, and genuinely useful.

I enjoy working at the intersection of engineering, product, and emerging technology—taking complex ideas and turning them into thoughtful experiences that solve real problems.


🚀 Featured Projects

AI-powered SaaS platform for converting bank statement PDFs to structured Excel/CSV data

  • Tech Stack: Next.js 15.3, FastAPI, PostgreSQL, Prisma, NextAuth v5, Mistral OCR, Cloudflare R2, Stripe
  • Features: Microservices architecture, AI-powered OCR, subscription management, 95%+ accuracy
  • Impact: Reduces manual data entry from hours to minutes

SaaS platform that generates llms.txt files for websites to improve visibility to Large Language Models

  • Tech Stack: React 19, TanStack Router, Hono, Cloudflare Workers, Trigger.dev v3, Firecrawl API, OpenAI API
  • Features: Real-time WebSocket updates, monorepo architecture, intelligent rate limiting, comprehensive OpenAPI docs
  • Highlights: Edge deployment, long-running background jobs with instant feedback

SpeedInts (work in progress)

Website monitoring platform for tracking performance, site health, screenshots, changes, and AI-readiness

  • Tech Stack: React 19, TanStack Router, Hono, Cloudflare Workers, D1, R2, KV, Drizzle ORM, Better Auth, Stripe
  • Features: Core Web Vitals monitoring, multi-page audits, site health scans, screenshot comparison, change detection, alerts, and branded PDF reports
  • Highlights: Edge-deployed architecture, scheduled monitoring, AI-powered improvement recommendations, and nine-language support

📊 DataTalked (work in progress)

An interactive data visualization platform that transforms datasets into AI-powered narratives and dashboards

  • Tech Stack: React 19, TanStack Router/Table, Convex, AI SDK (Anthropic/OpenAI), Recharts, Clerk Auth, Stripe
  • Features: Real-time database, AI-driven insights, large dataset optimization, role-based access control
  • Focus: Business intelligence through compelling data storytelling

💻 Tech Stack Highlights

  • Frontend: React, Next.js, TypeScript, JavaScript, Vue, Nuxt, Astro, TanStack Router, TanStack Query, TanStack Table, Tailwind CSS, Radix UI, Base UI, Shadcn/ui, StyleX, Material UI, Styled Components, Sass, Storybook
  • Backend: Node.js, Python, FastAPI, Hono, C#/.NET, PHP, Laravel, Go, Convex
  • APIs & Integrations: REST APIs, GraphQL, tRPC, Webhooks, OAuth, third-party API integrations
  • Databases & ORMs: PostgreSQL, MySQL, MongoDB, Cloudflare D1, Supabase, Prisma, Drizzle ORM
  • AI & LLMs: Vercel AI SDK, RAG, LLM workflows, embeddings, AI agents, prompt engineering, OCR pipelines, AI-powered data processing
  • Real-time & Async: WebSockets, real-time data pipelines, Convex Real-time DB, Trigger.dev, Cloudflare Queues, background jobs, queue management
  • Authentication & Security: Better Auth, Auth.js, Clerk, Hanko, OAuth, JWT, RBAC, API security, OWASP
  • Cloud & Serverless: Cloudflare Workers, R2, D1, Queues, Docker, edge computing, serverless architectures
  • Testing & Quality: Vitest, Jest, React Testing Library, Playwright, Cypress, ESLint, Biome, Core Web Vitals, performance optimization
  • DevOps & CI/CD: Git, GitHub Actions, Jenkins, automated deployments, multi-environment deployments
  • Payments: Stripe Subscriptions, Checkout, Billing Portal, Stripe Webhooks, recurring billing, credit-based pricing
  • Data Visualization & 3D: Recharts, D3.js, Three.js, interactive dashboards, real-time visualization
  • CMS & Content Platforms: WordPress, custom themes/plugins, ACF, WP REST API, HubSpot CMS
  • Accessibility: WCAG 2.1/2.2, semantic HTML, keyboard accessibility, screen-reader support, accessibility testing
  • Mobile: React Native, Expo, SwiftUI
  • Analytics, Experimentation & Observability: GA4, Google Tag Manager, Segment, PostHog, Amplitude, Hotjar, Microsoft Clarity, Meta Pixel, A/B testing, conversion tracking, Sentry, New Relic

Contact me

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johanguse.dev

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  1. hanko_hackathon hanko_hackathon Public

    AI generator crafted for the Hanko Hackathon 2023, harnessing the capabilities of NextJS to create a seamless authentication experience.

    TypeScript 2

  2. afya-pebmed-challenge afya-pebmed-challenge Public

    NextJS app frontend of a checkout system for the Afya PEBMED Challenge

    TypeScript 1

  3. api-go-lang-transations api-go-lang-transations Public

    Golang API w/ Fiber. Used in the test of Warren Brasil front-end challenge

    Go 1

  4. api-cars-auctions api-cars-auctions Public

    AdonisJS API. Designed for the front-end test at InstaCarro.

    TypeScript 1

  5. food-menu-frontend-challenge food-menu-frontend-challenge Public

    A digital menu for a renowned food delivery company in Brazil

    TypeScript

  6. next-saas-template next-saas-template Public template

    Powerful boilerplate with Next.js 14, Prisma, PostgreSQL, Auth.js v5, Resend, React Email, Shadcn/ui, and Stripe.

    TypeScript 26 4