name: Wilfredo Rujel
location: Lima, Peru
company: SAP
role: Senior Software Engineer
interests:
- Building scalable web applications
- Competitive programming & algorithms
- Open source contributions
currently:
- Writing technical blog posts at wrujel.com/blog
- Building developer tools & side projects
airbnb-clone Airbnb app clone with Next.js 13, that allows you to search for properties, a... ⭐ 26 • 🍴 12 • 
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portfolio-web-template This a project to create a web portfolio using Next.js 14, React, TypeScript... ⭐ 4 • 🍴 0 •
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tesla-landing Tesla landing with Astro and Tailwind, fully responsive design. ⭐ 3 • 🍴 0 • 
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tetris-javascript A modern implementation of the classic Tetris game, built with JavaScript, po... ⭐ 1 • 🍴 1 • 
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netflix-clone App inspired by Netflix, built with Next.js, Typescript, Tailwind CSS, Next-A... ⭐ 2 • 🍴 0 •
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django-crud-react This project is a simple REST API with Django and React. ⭐ 2 • 🍴 0 • 
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Graceful Shutdown in Node.js Production Services Most Node.js services silently drop in-flight requests on every deploy. Here's h… |
📅 Apr 18, 2026backend⏱ 5 min read |
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Composable Middleware Pipelines in TypeScript Stop bolting middleware onto frameworks and start building type-safe, composable… |
📅 Apr 12, 2026backend⏱ 4 min read |
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Runtime Type Safety with Zod: Validating at Every Boundary TypeScript's type system stops at compile time — Zod closes the gap by validatin… |
📅 Apr 11, 2026engineering⏱ 4 min read |
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HTTP Caching Demystified: Cache-Control, ETags, and CDN Strategies A practical guide to HTTP caching headers — what each directive actually does, w… |
📅 Apr 4, 2026backend⏱ 4 min read |
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React Server Actions: Patterns, Pitfalls, and Production Use Server Actions bring form handling and mutations back to the server in Next.js —… |
📅 Apr 1, 2026frontend⏱ 4 min read |
3885 problems solved | 6 languages | 72 topics | 57% avg acceptance
| Difficulty | Solved | Progress |
|---|---|---|
| 🟢 Easy | 936/936 | ████████████████████ 100.0% |
| 🟡 Medium | 2030/2030 | ████████████████████ 100.0% |
| 🔴 Hard | 919/919 | ████████████████████ 100.0% |
| Language | Problems | Share |
|---|---|---|
| 3420 | 88% | |
 Pandas | 235 | 6% |
| 103 | 3% | |
| 67 | 2% | |
| 56 | 1% |
