Freelance Fullstack Engineers in MadridFreelance Fullstack Engineers in 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
19
Followers
Founders' Tech Partner | Full-Stack AI Engineer | 14 yrs exp
Cover image for Pulso: Prospect Intelligence Dashboard
Pulso: Prospect Intelligence Dashboard
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2
Cover image for Raven: AI Knowledge Management Platform
Raven: AI Knowledge Management Platform
1
1
Cover image for PartSpace: AI-Powered B2B Procurement Platform
PartSpace: AI-Powered B2B Procurement Platform
1
2
4
Cover image for NurvAI: Website Redesign & Development
NurvAI: Website Redesign & Development
1
2
Fullstack Engineer(13)
Luke Jovanovic's avatar
Luke Jovanovic
Madrid, Spain
agencra.xyz - Automated Pipelines. Ship in days, not weeks.
$5k+
Earned
27x
Hired
5.0
Rating
4
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.
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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.
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32
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
0
Cover image for Alephyr — Trading Engine with Evolutionary Optimization
Alephyr — Trading Engine with Evolutionary Optimization
0
3
Fullstack Engineer(3)
Facundo Cappella's avatar
Facundo Cappella
maxMadrid, Spain
Tech Lead | Solution Architect | AI Engineer
133
Followers
Tech Lead | Solution Architect | AI Engineer
Cover image for https://dealy.figma.site/ Latest Updates 🚀 📍 Improved
https://dealy.figma.site/ Latest Updates 🚀 📍 Improved User Location Accuracy The map now centers precisely on the user's current location. Increased zoom levels make it much easier to identify the exact position and nearby points of interest. 🌐 Domain Update Renamed the domain to better reflect the application's purpose and branding. Tech Stack Supabase Next.js Skills & Focus Areas UI/UX Design Next.js Best Practices Geolocation & Mapping Frontend Performance Optimization Small improvements like these can make a significant difference in usability and overall user experience.
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2
109
Cover image for Create Stunning Custom Banners with This Easy Canva Alternative
Hello, I just built a simple tool similar to Canva that lets you create custom banners. I originally made it for personal use, but I decided to make it public in case it could be useful for others. Feel free to use it, and if you have any suggestions or feedback, I’d really appreciate it. https://ln-banner-generator.vercel.app/
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197
Cover image for Rate My Idea
Rate My Idea
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2
Cover image for Whitepaper Finder
Whitepaper Finder
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3
Fullstack Engineer(4)
Pedro Molina's avatar
Pedro Molina
Madrid, Spain
Fullstack Engineer: AI-Driven Solutions
11
Followers
Fullstack Engineer: AI-Driven Solutions
Cover image for Tequeño Studios | Agencia Digital Creativa
Tequeño Studios | Agencia Digital Creativa
0
3
Cover image for Auratify
Auratify
0
2
Cover image for Pekebyte.com
Pekebyte.com
0
3
Cover image for Size Wizard - Shopify App
Size Wizard - Shopify App
0
2
Fullstack Engineer(2)
Omar Moreno Melcón's avatar
Omar Moreno Melcón
Madrid, Spain
SaaS UI Engineer | From concept to production code
New to Contra
SaaS UI Engineer | From concept to production code
Cover image for Minimind personal organisation app
Minimind personal organisation app
0
1
Cover image for Letr.es blogging platform
Letr.es blogging platform
1
0
Cover image for A client commissioned us to
A client commissioned us to build a live video production studio from scratch, running entirely in the browser with no specialised equipment needed. The result is a SaaS application with multi-camera compositing, WebRTC ingestion, and RTMP output to Twitch, YouTube, and Facebook. The application included multi-camera compositing, real-time social media comments overlay, customizable backgrounds and overlays, and a layout manager for arranging the positioning of video sources and content on the fly. In this project I handled the brand identity, the complete interface design, and the interface development with Nuxt 3. The biggest challenge was organising a feature-rich application into an interface that felt intuitive for non-experts.
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