Freelancers using Next.js in MadridFreelancers using Next.js in Madrid
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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
56
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
1
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
50
Cover image for Alephyr — Trading Engine with Evolutionary Optimization
Alephyr — Trading Engine with Evolutionary Optimization
0
4
Next.js(2)
Fernando Montezuma's avatar
Fernando Montezuma
Madrid, Spain
Senior Product Designer + Front-end for SaaS, Fintech & B2B.
1x
Hired
22
Followers
Senior Product Designer + Front-end for SaaS, Fintech & B2B.
Cover image for Fenix Finance - Branding, Website and Product
Fenix Finance - Branding, Website and Product
0
10
Cover image for Accelera - Branding, UX/UI, Motion / 3D
Accelera - Branding, UX/UI, Motion / 3D
0
11
Cover image for Carbon Terminal - Branding, UX/UI, Motion, 3D and Front-end
Carbon Terminal - Branding, UX/UI, Motion, 3D and Front-end
0
9
Cover image for RiseLabs - Branding, UX/UI, Motion, 3D and Front-end
RiseLabs - Branding, UX/UI, Motion, 3D and Front-end
0
10
Next.js(7)
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
6
Cover image for Pulso: Prospect Intelligence Dashboard
Pulso: Prospect Intelligence Dashboard
1
6
Cover image for Raven: AI Knowledge Management Platform
Raven: AI Knowledge Management Platform
1
4
Next.js(1)
Alex Mamaev's avatar
Alex Mamaev
Madrid, Spain
AI & SaaS Developer with Product Expertise
AI & SaaS Developer with Product Expertise
Cover image for Developing a Chatbot and Widget for Property Managers
Developing a Chatbot and Widget for Property Managers
0
14
Cover image for Developing an AI-Powered Tool for Gathering Customer Feedback
Developing an AI-Powered Tool for Gathering Customer Feedback
0
15
Cover image for Chrome Extension for Scheduling Meetings Globally
Chrome Extension for Scheduling Meetings Globally
0
14
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Next.js(2)
Esteban Aleart Salas's avatar
Esteban Aleart Salas
Madrid, Spain
Full Stack Dev & SaaS Architect, scalable B2B platforms.
New to Contra
Full Stack Dev & SaaS Architect, scalable B2B platforms.
Cover image for TicketXEvent is a web platform
TicketXEvent is a web platform for event ticketing designed to streamline the discovery, purchase, and management of event tickets. The system allows users to browse upcoming events, view details and complete secure purchases with a seamless, user-friendly experience. Designed and implemented a responsive frontend interface with intuitive navigation and interactions. Built a scalable backend to handle event data, user authentication, and transaction processing. Integrated secure payment workflows and order management systems. Ensured performance optimization and maintainability through clean architecture and modular code. Delivered well-documented, production-ready code suitable for continuous enhancements. Tech stack highlights: React/Next.js, Node.js, API integrations, responsive design, secure transaction flows.
0
55
Cover image for Lyons One is a web‑based
Lyons One is a web‑based CRM built for managing leads in an educational platform headquartered in Uruguay. The project focuses on streamlining lead capture, tracking, and conversion processes through intuitive admin tools and clear performance metrics. Key features include: Lead registration and segmentation by source, interest, and status Conversion pipeline visualization Lead search, filter, and activity tracking Analytics to improve lead generation and follow‑up strategies Technologies used: Next.js, React, Node.js, PostgreSQL, Tailwind CSS My role encompassed full‑stack architecture design, frontend and backend development, implementation of real‑time data features, and deployment.
0
62
Cover image for Nakama (wearenkm.com (http://wearenkm.com)) es un
Nakama (wearenkm.com (http://wearenkm.com)) es un ecosistema de consultoría y desarrollo enfocado en la creación de productos digitales escalables. Trabajamos con startups y empresas en crecimiento para diseñar, construir y evolucionar plataformas web, SaaS y soluciones basadas en inteligencia artificial. Nuestro enfoque combina desarrollo full stack (JavaScript, React, Next.js), arquitectura de sistemas e integración de tecnologías modernas como APIs, automatización y modelos de IA (embeddings, RAG), permitiendo transformar ideas en productos sólidos y preparados para crecer. Más que desarrollo, en Nakama aportamos visión técnica y de producto, ayudando a tomar decisiones estratégicas que eviten deuda técnica y aseguren escalabilidad a largo plazo.
0
22
Cover image for Parabola is a no-code automation
Parabola is a no-code automation platform that allows users to create custom workflows and automate tasks without requiring extensive coding knowledge. The platform provides a visual interface for designing workflows, integrating with various apps and services, and automating tasks. Key Features: * No-code workflow automation * Visual interface for designing workflows * Integration with various apps and services * Customizable workflows * Automation of repetitive tasks
0
24
Next.js(2)
Gonzalo Franco's avatar
Gonzalo Franco
Spain
Software Engineer: Building Awesome Webs Apps & Products
Software Engineer: Building Awesome Webs Apps & Products
Cover image for Lead Engineer, eth-roulette.com
Lead Engineer, eth-roulette.com
0
8
Cover image for Full-stack developer – OB Studio
Full-stack developer – OB Studio
0
16
Cover image for CTO, Subletny.com
CTO, Subletny.com
0
24
Cover image for CTO, OpenBroker.com
CTO, OpenBroker.com
0
24
Next.js(4)