Freelancers using React in Community of MadridFreelancers using React in Community of Madrid
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Berckan Guerrero's avatar
Berckan Guerrero
maxMadrid, Spain
Founders' Tech Partner | Full-Stack AI Engineer | 14 yrs exp
$25k+
Earned
8x
Hired
5.0
Rating
20
Followers
Founders' Tech Partner | Full-Stack AI Engineer | 14 yrs exp
Cover image for SpeedDoc: AI-powered web performance optimization
SpeedDoc: AI-powered web performance optimization tool that scans websites, diagnoses bottlenecks, and generates ready-to-implement fix code. Not generic Lighthouse advice: actual code patches developers can copy and apply directly to their codebase. Built as part of a Vercel AI Accelerator application. Scans run against live URLs, identify specific performance issues (render-blocking resources, unoptimized images, layout shifts), and return targeted fixes with before/after impact estimates. Next.js 16, TypeScript, Tailwind 4, Vercel. Personal project.
1
1.7K
Cover image for NurvAI: Website Redesign & Development
NurvAI: Website Redesign & Development
1
11
Cover image for Pulso: Prospect Intelligence Dashboard
Pulso: Prospect Intelligence Dashboard
1
7
Cover image for Raven: AI Knowledge Management Platform
Raven: AI Knowledge Management Platform
1
4
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Luke Jovanovic's avatar
Luke Jovanovic
Madrid, Spain
agencra.xyz - Automated Pipelines. Ship in days, not weeks.
$5k+
Earned
27x
Hired
5.0
Rating
6
Followers
REPLIT_EXPERT

Expert

agencra.xyz - Automated Pipelines. Ship in days, not weeks.
Cover image for Concordium — Supply Chain &
Concordium — Supply Chain & Testnet Infrastructure We delivered two blockchain projects for Concordium: a supply chain track-and-trace system and a testnet faucet. Track-and-trace: - Built a CIS-3 NFT smart contract (Rust) for product tracking. - Added sponsored transactions so users don’t need to hold tokens. - Implemented an indexer to track all on-chain movements in real time. - Shipped a full frontend and Docker-based infrastructure. Testnet faucet: - Developed a Next.js faucet with Cloudflare Turnstile bot protection. - Added per-address daily limits and balance checks via the explorer API. - Provided complete documentation for deployment and maintenance. Outcome: - Both systems production-ready and actively used. - 92 combined commits, clean architecture, ready-to-reuse patterns. This case shows our ability to ship end-to-end blockchain solutions—smart contracts, infrastructure, and UX—in one go.
1
111
Cover image for Yield-Nexus — Real-Time Crypto Portfolio
Yield-Nexus — Real-Time Crypto Portfolio & Trading Platform We built Yield-Nexus as a real-time crypto portfolio and trading dashboard aggregating data across Binance and Bybit. Traders needed a unified view of spot holdings, futures positions, and PnL without switching between exchange consoles.
1
106
Cover image for NYC Watch Party Finder — From Idea to Production in 3 Days
NYC Watch Party Finder — From Idea to Production in 3 Days
0
4
Cover image for Alephyr — Trading Engine with Evolutionary Optimization
Alephyr — Trading Engine with Evolutionary Optimization
0
10
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fernando aporta franco's avatar
fernando aporta franco
proMadrid, Spain
Automation Engineer — bots, scraping & AI (Claude/OpenAI)
New to Contra
Automation Engineer — bots, scraping & AI (Claude/OpenAI)
Cover image for kenetg.com (http://kenetg.com) — a live,
kenetg.com (http://kenetg.com) — a live, responsive website I designed, built and deployed end to end. I owned the full process: strategy and information architecture, UX/UI and creative direction, development, and deployment. Architecture: built on Next.js / React for speed and SEO, with a headless CMS (Payload) powering all content. The public site and the CMS run as separate services, so the front end stays fast while a non-technical team manages pages, media and structured content themselves — no developer needed for day-to-day updates. Custom content blocks (galleries, embeds, callouts) give editors flexibility without touching code. Delivery: fast, mobile-first and SEO-ready, on a clean, spacious design system; hosted on Google Cloud behind a hardened reverse proxy with automated, safe deploys. Why it's relevant to a premium B2B redesign: it's exactly the model you need — a fast, credible, easy-to-manage site where your own team controls the content, with a clear, conversion-focused structure. Role: full process — strategy, UX/UI, development, deployment. Live at kenetg.com (http://kenetg.com).
0
32
Cover image for scaffld — a CLI that
scaffld — a CLI that scaffolds fully-wired Python projects (tests, CI, pre-commit, license) with a friendly TUI. Code: github.com/ferinazuma/scaffld
0
41
Cover image for structllm — reliable structured output
structllm — reliable structured output from any LLM: schema-validated JSON with tolerant repair, provider-agnostic. Code: github.com/ferinazuma/structllm
0
42
Cover image for framesig — find on-screen events
framesig — find on-screen events in video by pixel signature (game-agnostic computer vision, no ML). Code: github.com/ferinazuma/framesig
0
47
React(1)
Pedro Molina's avatar
Pedro Molina
Madrid, Spain
Fullstack Engineer: AI-Driven Solutions
12
Followers
Fullstack Engineer: AI-Driven Solutions
Cover image for Tequeño Studios | Agencia Digital Creativa
Tequeño Studios | Agencia Digital Creativa
0
4
Cover image for Size Wizard - Shopify App
Size Wizard - Shopify App
0
6
Cover image for Pekebyte.com
Pekebyte.com
0
5
Cover image for Dietmind: AI Meal prep planner
Dietmind: AI Meal prep planner
0
6
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Alex Mamaev's avatar
Alex Mamaev
Madrid, Spain
AI & SaaS Developer with Product Expertise
AI & SaaS Developer with Product Expertise
Cover image for Chrome Extension for Scheduling Meetings Globally
Chrome Extension for Scheduling Meetings Globally
0
14
Cover image for Developing an AI-Powered Tool for Gathering Customer Feedback
Developing an AI-Powered Tool for Gathering Customer Feedback
0
17
Cover image for Developing a Chatbot and Widget for Property Managers
Developing a Chatbot and Widget for Property Managers
0
15
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