Hire the Best CSS3 Developers
in Costa Rica

Senior Full-Stack Engineer with 11+ years of experience building production-grade web and mobile applications. My core stack covers TypeScript, React, React Native (Expo), Next.js, Vue.js, Node.js, .NET/C#, PostgreSQL, and AWS. I've delivered across a wide range of projects: a multi-provider auth system on AWS Cognito with Apple, Google, and Facebook identity linking; a React Native fintech app with biometric auth and real-time data sync; complex SOAP/REST API integrations on .NET backends with EF Core; and a Web3 platform with dual wallet flows using wagmi v2 and OnchainKit. Beyond writing code, I take ownership of architecture decisions, API design, and CI/CD setup — contributing at every layer of the stack. I work best with async teams that value technical clarity and independent execution. If you need someone who can take a feature from spec to production without hand-holding, let's talk.

I’m a Front-End Web Developer with hands-on experience building websites and user interfaces from scratch, from initial layout to final implementation. I regularly work from Figma mockups to translate designs into clean, responsive front-end code, and I’ve integrated front-end applications with API endpoints to fetch, manage, and display dynamic data in React applications. I focus on creating clean, responsive, and user-friendly interfaces using modern front-end tools. I’m comfortable working independently or joining existing codebases, adapting quickly, and delivering well-structured, maintainable UI. What I can help you with: - Building front-end interfaces from scratch using React - Implementing designs from Figma mockups into pixel-accurate, responsive UI - Creating simple Figma mockups when a project needs a starting layout - Responsive, mobile-first layouts with HTML5, CSS3, and Tailwind CSS - Clean, reusable, and maintainable UI components - Integrating front-end applications with REST APIs and endpoints to fetch and display dynamic data - UI improvements, bug fixes, and layout refinements - Fast-loading static websites with clean HTML and CSS Technical background: - Strong foundation in JavaScript and modern React development - Experience with state management (Context API, Redux) - Familiar with front-end testing, debugging, and best practices - Version control using Git and collaborative workflows - Background in SQL databases and technical support environments Currently, I’m expanding my skills in the modern React ecosystem, including Next.js, while continuously strengthening my front-end expertise. Why clients like working with me: - Clear and proactive communication - Reliable, detail-oriented, and deadline-focused - Open to feedback and quick to apply improvements - Strong problem-solving mindset backed by IT and customer service experience I’m currently focused on Front-End projects such as React development, UI improvements, landing pages, and fast, responsive websites. If you’re looking for a dependable front-end developer who builds clean UI and communicates clearly, I’d be happy to work with you.

🚀 Accelerate your software delivery by 60% with proven Agile leadership from Fortune 500 companies and high-growth startups, backed by deep technical expertise. I'm a Certified Scrum Master (CSM) and CAPM who transitioned from over 10 years as a Senior Web Engineer to Agile leadership, bringing unique technical credibility that accelerates team performance and removes blockers faster. **WHAT I DO:** ✅ Agile Transformation & Change Management ✅ Sprint Planning, Daily Standups & Retrospectives ✅ Backlog Refinement & Release Management ✅ Cross-Functional Team Leadership (4-16 developers) ✅ JIRA/Confluence Setup & Workflow Optimization ✅ Product Owner Coaching & Stakeholder Management ✅ Scrum@Scale Implementation for Multiple Teams **PROVEN RESULTS:** - Reduced delivery time by 60% through process redesign - Cut PI Planning meetings from 8 to 3 hours (60% time savings) - Increased team velocity by 40% using Scrum@Scale - Decreased defects by 25% via continuous improvement initiatives - Shortened release cycles from 2 months to 30 minutes - Improved product delivery by 20% through effective backlog management - Enhanced team engagement by 50% creating psychologically safe environments **INDUSTRIES SERVED:** Technology • SaaS • Enterprise Software • FinTech • Marketing Agency **WHY MY TECHNICAL BACKGROUND MATTERS:** Unlike typical Scrum Masters, my 10+ years as a developer mean I: → Understand technical debt and architecture decisions → Can evaluate story complexity and estimate accurately → Remove technical blockers without endless escalations → Speak the engineering team's language, earning immediate trust → Bridge business requirements with technical feasibility **CERTIFICATIONS:** - Certified Scrum Master (CSM) - Scrum Inc. - Scrum@Scale Practitioner - Scrum Inc. - CAPM - Certified Associate in Project Management (PMI) - Agile Metrics for Success - Project Management Institute - MBA in Business Administration (in progress) **CAREER PROGRESSION:** → Scrum Master at Fortune 500 tech corporation (2022-2025) → Scrum Master & Development Lead at SaaS startup (2021-2022) → Scrum Master & Senior UI Engineer at SaaS startup(2019-2022) → 10+ years in technical roles: Developer, Architect, Technical Lead **TECHNICAL EXPERTISE:** Frontend: React, NextJS, TypeScript, JavaScript, HTML5, CSS3 Backend: Python, Django, Node.js, SAP/ABAP, PHP Tools: JIRA, Confluence, Git, 🌎 **100% BILINGUAL:** English (Professional) | Spanish (Native) **AVAILABLE FOR:** - Ongoing Scrum Master services - Agile transformation consulting - Sprint facilitation & team coaching (hourly or per-sprint) - JIRA/Confluence setup & process optimization Let's discuss how I can help your team achieve consistent Sprint goals and deliver business value faster. Send me a message to schedule a consultation call.

Do you need a bilingual (EN/ES) virtual assistant who is organized, fast, and reliable? I can help you manage your daily tasks and keep your business running smoothly. I specialize in: ✅ Data entry in Excel and Google Sheets ✅ Email and schedule management ✅ Admin support and client follow-ups ✅ Report creation and file organization Tools I use daily: Excel, Google Sheets, Notion, Trello, Gmail, ChatGPT I'm professional, proactive, and focused on quality and clarity in every task. Let's work together!

I'm a 100% bilingual Full Stack and Automation Engineer with over 20 years of experience working with US-based companies. I've done mostly Web Development, REST APIs, QA lead, Test Automation and DevOps-related tasks, like deployment and provisioning automation. Regarding Web Development, I specialize in Wordpress, PHP and Java, and I have thorough experience integration with 3rd party APIs, like payment gateways and social media sites. I also focus on the client project as a whole thing, and not only as a development project, so I will suggest and encourage usage of web analytics, cloud based solutions and anything I can do to help your business succeed. Regarding QA and Test Automation, I have experience as QA Manager, handling teams of QA Engineers, and I have successfully implemented test automation frameworks for ECommerce and SaaS applications. These frameworks were based on Selenium WebDriver, using Java, TestNG and Maven. In addition to this, I have implemented internal Selenium Grids, using virtual machines and Docker containers, that supported up to 60 concurrent tests, executed by a Jenkins job. This enabled a suite of almost 300 regression tests to run in under 15 minutes, enabling the development team to run full regressions on the sites multiple times per day. I'm more than happy to offer you my services, so I'm always willing to be contacted for an interview. I'll be thrilled to be a part of your projects!

I’m a web developer and designer with experience in UX/UI design. I think about both the end user and the people who will build and maintain the product. I enjoy creating designs that are attractive, functional, and consistent with the brand, and that work well with code. Experience in wireframes, high-fidelity prototypes, and scalable design systems Strong collaboration with multidisciplinary teams, connecting design and development Clear communication is important to me, so we can work together smoothly and efficiently