Freelance Fullstack Engineers in San IsidroFreelance Fullstack Engineers in San Isidro
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Ciro 's avatar
Ciro
Buenos Aires, Argentina
Go to sleep, may your sweet dreams come true...
267
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Go to sleep, may your sweet dreams come true...
Cover image for Surfing in Hawaii: A Hawaiian Rollercoaster Tribute Website
Surfing in Hawaii: A Hawaiian Rollercoaster Tribute Website
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Cover image for Kabuki Theatre Website
Kabuki Theatre Website
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Cover image for Lyon Café App: Blending Nostalgia with TypeScript & React
Café à Lyon App Development Choosing Lyon for this project was not a random decision, but rather rooted in a distant souvenir, perhaps a postcard of what might have been, but never was. I chose calm, coffee-like colors such as shades of brown and cream, an elegant typography. Creating this app was a mix of writing code, compassing the design, and also with a spoonful of nostalgia and a mellow mood. I worked with TypeScript, React, among other tools, such as Lummi for generating more than 25 images. I also created a flipping-card game in one of the sections, which you can see here. This is also my final project of February, and what a way to end it! Choosing one of my favorite destinations along with a fascinating topic! You can read the whole process here (https://contra.com/p/OqWPQgLm-cafe-a-lyon-creating-a-simple-app)
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Cover image for Café à Lyon: A Sweet and Interactive App/Website
Café à Lyon: A Sweet and Interactive App/Website
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Fullstack Engineer(16)
Juan ignacio Veltri's avatar
Juan ignacio Veltri
Caseros, Argentina
Senior Full Stack Engineer · Next.js · React Native · Expo
New to Contra
Senior Full Stack Engineer · Next.js · React Native · Expo
Cover image for Polopage es la plataforma digital
Polopage es la plataforma digital del polo mundial. Reúne en un solo lugar el directorio global de jugadores con handicap, país y club; el ecosistema de servicios del deporte (caballos, herreros, veterinarios, talabartería, clubes, transporte); noticias del polo internacional; y una comunidad activa con chat en vivo y surveys con recompensa. Construido con Next.js + TypeScript, optimizado para SEO multi-idioma (ES/EN), con datos de jugadores top como Adolfo Cambiaso, Facundo Pieres y la familia Castagnola.
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Cover image for BE PAWLY — A COMPLETE
BE PAWLY — A COMPLETE LAUNCH KIT, ORCHESTRATED BY AN AGENT IN ONE AFTERNOON The premise I'm an indie dev about to launch Be Pawly, an AI-powered app that matches photos of lost and found pets in real time, helping reunite them with their owners. The product is ready. The launch kit wasn't. Hiring an agency for identity, mockups, ads, and a launch video wasn't on the table for a solo founder. So I gave Melius a single brief and let Mel orchestrate the entire kit. The result 18 connected nodes. One coherent brand. About 4,000 credits consumed out of 50,000. → Hand-drawn bilingual logo with the tagline "Conectamos corazones, reunimos familias" → 3 mobile app UI mockups (Upload Lost Pet, AI Match, Reunion Confirmed) → 4 emotionally segmented Meta ads (Community, Gratitude, Hope, Urgency) → 1 redesigned modern "missing pet" street flyer with QR → 1 cinematic 15-second vertical Instagram video, anchored to a keyframe The process, in three phases I gated execution by phase to manage credits and review the agent's output at every dependency boundary. Phase 1 — Foundation (72 credits). Just the logo. The logo anchors every downstream asset, so it was the only node I needed to lock before generating anything else. Mel routed GPT Image 2 (Medium) and delivered a hand-drawn terracotta mark, and proposed a bilingual tagline I never asked for, but that fit the Latin American neighborhood-first tone perfectly. Phase 2 — Derivatives (around 1,000 credits, 8 parallel nodes). Three UI mockups, four ad variants, one flyer. Mel propagated the Spanish tagline across every asset without prompting, invented credible character names (Max, Toby, María & Simba), and used context-appropriate Latin American Spanish ("publicador" instead of "poster"). The brand feels like a real product, not stock. Phase 3 — Motion (around 3,000 credits). A cinematic keyframe of the reunion, then a 15-second vertical Instagram spot anchored to it. When I asked Mel which model it would use, it didn't just pick — it offered me Kling 3.0 Omni (2,520 credits) versus Grok Imagine (1,260 credits), explained the tradeoff ("Kling handles the emotional human-first nuance a bit better"), and let me decide. What separates an agent from a generator Three behaviors Mel did on its own that no generator I've used does: Model routing with reasoning. GPT Image 2 across the 8 image nodes for stylistic coherence; Kling 3.0 Omni for the video, chosen for emotional nuance. Transparent about cost tradeoffs. Style propagation through wired connections. The tagline, color palette, and character voice flowed from one node into every downstream node automatically. No copy-paste, no re-prompting. Initiative within taste. The bilingual tagline. The character names. The neighborhood-aware Spanish. These were unprompted but always on-brief. Feedback for the Melius team What worked beautifully: → The canvas-as-conversation model. Being able to point at a specific node and refine it without re-running the whole graph is a step-change versus linear chat-based generation. → Mel's proactive credit transparency. Asking "which model and how many credits" before running was huge for budget management. → Auto-grouping into Brand Identity, Meta Ad Campaign, and Social Video was an unprompted decision that made the canvas instantly readable. Suggestions: → Surface estimated credit cost on hover for every node before approval, not just when prompted. → A "fork node" action to create alternative variants in parallel without losing the original would be useful for A/B-ing ads. → An export-as-launch-kit shortcut (a zip with all assets in presentation order) would close the loop from creative to delivery. Built entirely on Melius. Models routed: GPT Image 2 (Medium) and Kling 3.0 Omni. Total credits consumed: about 4,000 of 50,000. The 15-second reunion video is attached. Project canvas: https://app.melius.com/projects/04e916b8-35de-4957-8db6-53ac1af180ad/canvas/4d8d194a-d0d5-4e4c-a59b-d7a4561923bb
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Cover image for Sitio web premium para TMS
Sitio web premium para TMS Construcciones, empresa constructora argentina con más de 30 años de experiencia en el Alto Valle de Río Negro y Neuquén (región impulsada por Vaca Muerta). Showcase de 6 proyectos activos de desarrollo inmobiliario residencial y comercial, con renders 3D, animaciones fluidas, video hero y soporte bilingüe ES/EN. Construido con Next.js + TypeScript, animaciones con Framer Motion + GSAP, renders 3D con Three.js, internacionalización con next-intl. Stack frontend-first con foco en performance, SEO y experiencia visual de alto nivel.
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Cover image for Be Pawly es una plataforma
Be Pawly es una plataforma todo-en-uno para mascotas que usa inteligencia artificial para reunir mascotas perdidas con sus familias. El algoritmo analiza fotos, ubicación y características para encontrar coincidencias entre reportes de mascotas perdidas y encontradas, con notificaciones en tiempo real cuando hay un match. También conecta refugios verificados con adoptantes y permite difundir búsquedas en redes sociales. Stack: Next.js, TypeScript, Drizzle ORM, Google Vertex AI, Clerk, Pusher.
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Fullstack Engineer(1)
Mariano Molina's avatar
Mariano Molina
San Isidro, Argentina
Bridging Tech & Business for Success
Bridging Tech & Business for Success
Cover image for AI-Powered E-commerce Optimization Strategy
AI-Powered E-commerce Optimization Strategy
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Cover image for Project Alice
Project Alice
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Cover image for Product Strategy & Specification Development - Event Platform
Product Strategy & Specification Development - Event Platform
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Fullstack Engineer(2)
Mauro Casas's avatar
Mauro Casas
Buenos Aires, Argentina
Fullstack Engineer | Laravel & VueJS Expert
Fullstack Engineer | Laravel & VueJS Expert
Cover image for Scaffold, an AI-powered SaaS acceleration boilerplate
Scaffold, an AI-powered SaaS acceleration boilerplate
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Cover image for Multabot, lead-gen for attorneys
Multabot, lead-gen for attorneys
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Cover image for AI-powered match-making inside a community network
AI-powered match-making inside a community network
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Fullstack Engineer(1)
Francisco Gallardo's avatar
Francisco Gallardo
Buenos Aires, Argentina
Social Media Content Manager and Software Engineer
Social Media Content Manager and Software Engineer
Cover image for Full Stack Developer
Full Stack Developer
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Cover image for YouTube and Social Media Content Creation
YouTube and Social Media Content Creation
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Cover image for Social Media Content Manager
Social Media Content Manager
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Fullstack Engineer(1)
Carlos Miceli's avatar
Carlos Miceli
Buenos Aires, Argentina
Full-Stack Engineer | Sales Background
Full-Stack Engineer | Sales Background
Cover image for Temporary rentals web app
Temporary rentals web app
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Cover image for Interactive Canvas
Interactive Canvas
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Cover image for Estonia Experience
Estonia Experience
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Fullstack Engineer(1)