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
$50k+
Earned
8x
Hired
5.0
Rating
24
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
2
14
Cover image for Pulso: Prospect Intelligence Dashboard
Pulso: Prospect Intelligence Dashboard
1
13
Cover image for Raven: AI Knowledge Management Platform
Raven: AI Knowledge Management Platform
1
5
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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
7
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
114
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
109
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
11
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Kai Relaunch Dept's avatar
Kai Relaunch Dept
Madrid, Spain
AI Automation & Launch Recovery Specialist
New to Contra
AI Automation & Launch Recovery Specialist
Cover image for ScenarioReceipt: Evidence-Grounded Product UI
ScenarioReceipt: Evidence-Grounded Product UI
0
8
Cover image for A schema rename passed every unit test. It still broke a rev...
A schema rename passed every unit test. It still broke a revenue dashboard. The query changed from order_total to gross_amount; the schema was valid, but downstream models still expected the old field. The fix isn't another linter. Before merge, ask four questions: Which assets depend on this field? Is the change additive, rename, type change, or removal? Can we generate compatibility SQL and dbt YAML before touching production? Is there a decision receipt reviewers can reproduce? I built a bounded public replay of that workflow. Start with the CRITICAL case: it blocks a lossy decimal-to-integer change when an ML consumer sits downstream, then exposes the lineage, affected queries, compatibility artifacts, and deterministic run ID. Demo: https://schema-shield.vercel.app (https://schema-shield.vercel.app)Source/evidence: https://github.com/ceodaradigu/schema-shield What schema operation should the next fixture cover? AI-assisted analysis, reviewed before publication by RELAUNCH DEPT.
0
83
Cover image for Proofline Keeper — Transaction Firewall for AI Agents
Proofline Keeper — Transaction Firewall for AI Agents
0
8
Cover image for Proofline — Evidence Gate for AI Agents
Proofline — Evidence Gate for AI Agents
0
12
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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
7
Cover image for Pekebyte.com
Pekebyte.com
0
6
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
16
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