Hire the Best Bitcoin Developers
in Argentina

My name is Alex and I'm a full-stack software developer specializing in Next.js, Tailwind CSS, and Python, and an enthusiast trader who's been using crypto for personal needs since 2015. Also, I'm the founder of Trading Digits, an all-in-one crypto trading analytics platform that I came up with, designed, and coded all by myself from scratch. My tech stack and skills I can apply in your select projects include: • Next.js, Node.js • Tailwind CSS: I create 100% responsive UIs • Python: Automation and data scraping • Algorithmic trading scripts and crypto trading bots powered by Python, Node.js, and/or CCXT • HTML5 Canvas & D3.js: Creation of interactive complex charts from scratch based on your data and specializing in crypto and financial charts • Crypto APIs: I will find the right endpoints and integrate Binance, ByBit, OKX, Gateio, Etherscan, and other crypto APIs into your app • APIs for bots and automation: Telegram, Twitter, ChatGPT, and more • Vercel, AWS • PostgreSQL, Supabase • Docker, RabbitMQ • React Native • Adobe XD, Adobe Photoshop, Adobe Lightroom, Figma, Canva, UI/UX design, SEO Due to the currency controls present in Argentina for years, I started using Bitcoin and cryptocurrency for my daily needs since 2015 and took a profound interest in this field. I was following the crypto industry trends all this time and started casually trading in 2021. In 2022 I had this idea to create a website that would feature all the most essential and useful tools/calculators that crypto traders and investors use on a daily basis. So I learned to code and created it myself, please be sure to check out the website in my portfolio in order to understand more about my frontend development skills, the quality of the products I create, and their extremely fast performance achieved thanks to Next.js. I work efficiently both on my own and within a team and I always give attention to detail, thus delivering flawless and pixel-perfect UIs that are 100% responsive and look good on all screens. Being especially passionate about real-time crypto analytics, I know where to get the right APIs that will provide you the access to trustworthy live data, whether you opt for free or paid APIs. I can easily integrate these data into your app using either raw data provided by the API or manipulating it in order to create custom analytics for your business and visualize it in your interface the way you want. Apart from all of this, my almost 10 years long experience in crypto gives me a profound understanding of the industry upcoming and current technologies, visual trends, and user expectations on functionality and UI/UX implementations. Have a great day, Alex

I help businesses build and improve Android apps that are stable, modern, and ready for real users. My main focus has been Android development since 2018, working with Java, Kotlin, and Jetpack Compose. I have published 20+ apps on Google Play and built products from scratch, from idea to release. My experience includes: - Native Android development with Kotlin and Java - Jetpack Compose UI - Firebase integration - REST API integration with Retrofit - Local databases with Room - Authentication and user flows - Notifications and reminders - QR scanning with CameraX / ML Kit - App maintenance, bug fixing, and feature upgrades I also have experience building cross-platform apps with Flutter and React Native, which helps when a project needs flexibility across platforms. Before mobile development, I spent 9 years working on AdSense and affiliate websites, plus 2 years building custom websites and WordPress solutions with PHP, MySQL, Bootstrap, and Materialize. That gave me a strong product and performance mindset, including A/B testing, conversion optimization, and iterative improvement based on user behavior. What you can expect when working with me: - Clear communication - Clean and maintainable code - Reliable delivery - Focus on business goals, not only implementation - Fast adaptation to existing codebases I can help if you need to: - Build an Android app from scratch - Modernize an existing app - Convert legacy Java screens to Kotlin or Compose - Fix bugs and improve app stability - Connect your app to backend services - Add Firebase, local storage, notifications, or camera features If you need an Android developer who can build features end-to-end and work with real product needs, I can help.

Your product has real potential. The problem is that it’s hard to use, hard to scale, or no longer reflects the quality of what you’ve built. That’s where I come in. I’m Mariano, a Senior UI/UX and Product Designer with 15+ years of experience designing digital products from the ground up. I specialize in turning complex ideas into clear, scalable SaaS platforms, dashboards, and mobile apps that are easy to use and built to grow. I work closely with founders, PMs, and developers across the full product design cycle — from discovery and flows to high-fidelity, developer-ready Figma files. I don’t just make screens look better. I help make products clearer, more consistent, and easier to ship. What I help design: - SaaS platforms and internal tools - Data-heavy dashboards and analytics interfaces - Mobile apps for iOS and Android - Design systems — tokens, components, and documentation that keep products consistent as they scale - UX/UI redesigns for products that have outgrown their original design How I work: Every project starts with understanding the why — who the users are, what they need to do, and where the experience breaks down. From there, I move through structure, flows, wireframes, and polished UI, always balancing usability, clarity, and visual quality. For products with an existing design system, I often start with an audit — catching inconsistencies, gaps, and naming issues before they multiply across the product. I also use AI-assisted workflows (Claude, Claude Code) to speed up documentation, QA, and prototyping — without cutting corners on design judgment. My handoff files are clean, organized, and built for real collaboration with developers. The result I’m most proud of? Shipping full products end-to-end, where every screen has a purpose, every decision supports the product as a whole, and the design system holds it all together as it grows. Top Rated Plus · 100% Job Success · 36 completed projects · 5,800+ hours on Upwork If you need a senior designer who can bring structure, clarity, and strong product thinking to your team, send me a message and tell me what you’re building.

I make videos that boost your business, and since video has quickly become one of the most powerful ways to speak to an audience, I want to help you reach them by creating great videos for you. With over 20 years of professional experience in production companies and agencies, I started as a video editor and later expanded into motion graphics design. Lastly, I fully embraced freelancing and I'm loving every single minute of it 😃 As a Top Rated freelance video maker here on Upwork, I have worked with Fortune 500 companies such as Microsoft, Procter & Gamble, General Electric and Fortinet. I really like what I do and I'm always up to date with the latest video-making trends and techniques. I’m fully bilingual (Spanish-English), and maintaining fast, fluid communication with my clients is one of my top priorities. Let me take care of your video needs so you can focus on your business. Contact me so we can talk about your project! I do: Explainer videos / Logo animation / App Store Preview videos / YouTube intros / Instagram Reels / Facebook Video Ads / 3D Animation / Color correction, chroma key, rotoscoping, post production / Customer testimonials / Product demo videos / Videos for the Google Play Store / Motion GIFs / Stock footage videos / Visual Effects VFX / Premiere Motion Graphics Templates (.mogrt) / Trailers / Kinetic typography video / After Effects template customization (Video Hive, Envato) / Sizzle reels / 4K 60fps Camtasia screencast videos / Slideshow videos / Subtitling & closed captions (English-Spanish translation) / Script writing and storyboards / Soundtrack design and mixing / Voice over production. I use: After Effects / Premiere Pro / Cinema 4D / Photoshop / Audition / Illustrator / Media Encoder / Topaz Video AI macOS / Windows / iOS / Android.

I'm a Senior Web3 Engineer with 10+ years of software development experience and 5+ years building blockchain applications. I've founded and shipped multiple production Web3 products, including Vearn Finance, a DeFi protocol that received funding from the VeChain Foundation, and Gas Pump, a platform that simplifies blockchain onboarding through sponsored transactions. My expertise includes: • Solidity smart contract development • Smart contract security reviews and auditing • Foundry, Hardhat, Ethers.js, Viem, Wagmi • React, Next.js, TypeScript, Node.js • DeFi protocols, staking, rewards systems, tokenomics • EVM-compatible chains and VeChain I've also worked as a smart contract security researcher on Sherlock, Code4rena, and CodeHawks, reviewing production protocols and identifying vulnerabilities before deployment. Whether you need a smart contract built from scratch, a protocol audit, a frontend integrated with blockchain contracts, or a complete Web3 application, I can help take the project from idea to production. Recent projects: • Vearn Finance — DeFi protocol backed by a VeChain Foundation grant • Gas Pump — Sponsored transaction infrastructure for VeChain users • SolarWise — Solar asset tokenization platform • World of V — NFT marketplace Feel free to reach out if you'd like to discuss your project. 📌 GitHub: fede-rodes 🔍 Sherlock Security Research Profile: Feder Hope we can work together 😊

Hello! I'm Ramiro, thank you for landing on my profile. I'm a translator and a web developer. These are the skills and qualifications that I have: 👨🏻 Native Spanish speaker born in Buenos Aires, Argentina. Can handle LatAm, Neutral, Argentinean, and Rioplatense variants. 👨🏻‍🎓 Fluent English speaker (Duolingo English Proficiency Exam passed with 10/10 in 2015, endorsed by Upwork) ✍🏼 English-Spanish general content translation ✍🏼 Spanish localization ✍🏼 Spanish proofreading ✍🏼 Spanish transcription ✍🏼 Spanish content writing 🖥️ Frontend web development using Vue and jQuery I'm very experienced in this platform. Here are some of the accomplishments that I've achieved: ✅ 10+ year-long career! Working since 2014 ✅ 300+ projects successfully completed ✅ 4.95/5.0 Client Review Score ✅ Top Rated Freelancer badge ✅ Part of Exclusive Top Rated Freelancer Meetup with Upwork in Buenos Aires (October 24, 2015) I'm also very flexible and adaptable when it comes to the content I can work on. Check all the files that I can edit: 💻 Specialized in websites, apps, blogs, articles, emails, subtitles for common videos 📄 Text, spreadsheet and presentation documents (DOC, PDF, TXT, XLS, CSV, PPT) 📄 Native website code (HTML, XML, JSON) 📄 Portable objects (PO, POT) 📄 Subtitles (STL, SRT, SUB) 📄 Localization platforms, such as Crowdin or Lokalise Thanks to Upwork, I was able to collaborate with great clients and translate products like: 🏢 PDF24.org 🏢 BuyBitcoinWorldwide.com 🏢 Vision Education’s Learn Match 🏢 Chatous and Kiwi Q&A 🏢 Infinity Games, on Loop and other games I have a very clear and concise profile and work methodology. I can describe myself as: ➕ Reliable – certified and well-reviewed freelance professional ➕ Responsible – I deliver work in timely manner, with optimal quality ➕ Dedicated – this is my main job; I fully dedicate myself to it ➕ Experienced – went over very different projects, learning lots of things ➕ Comprehensive – anybody can have unexpected issues, it's part of life Thank you for reading, and I hope to get your message!