
Agustin Vazquez
Verified Expert in Engineering
Senior Front-end Developer
Trevelin, Chubut Province, Argentina
Toptal member since January 21, 2019
As an entrepreneur, Agustin understands the importance of ownership and results. With more than 15 years of software development experience and 8+ years focused on React Native, he has delivered mobile and web applications for startups and enterprise clients in healthcare, fintech, AI, and insurance. Agustin has a broad technical background and a product mindset that enable him to turn complex requirements into scalable, production-ready solutions.
Portfolio
Experience
- Android - 14 years
- iOS - 12 years
- React Native - 8 years
- React - 5 years
- Amazon Web Services (AWS) - 3 years
- Node.js - 2 years
- GraphQL - 2 years
- Express.js - 2 years
Preferred Environment
React, React Native, React Native for Web, Android, iOS, Node.js, MySQL
The most amazing...
...thing I created was a mobile app for Android, iOS, and mobile web. It supported desktop, tablet, and phone sizes with accessibility features for older adults.
Work Experience
React Native Front-end Engineer
343 HOLDING LLC
- Built layouts and implemented UI/UX screens in React Native across iOS and Android for a fantasy football watch-party app, delivering pixel-accurate, responsive interfaces from design specs.
- Implemented Google Sign-In and Apple Sign-In authentication across iOS and Android, enabling social sign-in onboarding for the app.
- Developed reusable React Native components that enforced visual consistency and accelerated feature delivery across the app.
Senior Front-end Developer
Bilt Technologies Inc
- Diagnosed and resolved critical production bugs across the Bilt Rewards cross-platform React Native app (iOS and Android), directly improving core user flows for a rewards platform serving millions of cardholders.
- Instrumented analytics events across key user journeys, giving product and data teams visibility into behavior funnels that previously had no tracking coverage.
- Adopted AI-assisted development workflows (Cursor, Claude Code) for module refactoring, reducing time-to-PR on complex tasks by an estimated 40% and lifting overall developer throughput.
React Native and React Web Developer
CopilotIQ
- Architected and delivered a unified cross-platform application (iOS, Android, tablet, and web) in React Native for Web, eliminating a parallel codebase and enabling a team of around 10 engineers to ship to all platforms from a single source.
- Founded and configured the company monorepo, consolidating the mobile and web apps into one repository; removed duplicated logic, unified the dependency graph, and cut feature implementation time roughly in half.
- Refactored a monolithic 20,000-line permissions JSON file into a modular, multi-file structure, reducing permission-change turnaround from days to hours and unblocking the clinical operations team.
- Integrated Twilio Voice and Video SDKs across React Native and React (web) surfaces, enabling real-time clinician-patient communication for a network of 200+ clinical staff, including nurses and care coordinators.
- Shipped CodePush over-the-air updates, push notifications, and Google Analytics, cutting store-release dependency and enabling same-day hotfixes on a live patient-facing healthcare product.
- Contributed React features to the internal admin dashboard used by clinical staff to manage patient interactions and care-coordination workflows across the full patient base.
React Native Developer
HUB International - TCG
- Created a mobile app with website tools for employees. Learned to use AWS Cognito, Face ID, and Multifactor Authentication.
- Added push notifications, CodePush, and Sentry for crash detection.
- Added several apps with the same code source supporting different UI colors with Android Flavors and Xcode Targets.
- Added deep linking and universal linking so the app opens when entering the website.
React Native Developer
Fetch.ai
- Developed an app that uses AI to learn from the user and plans your holidays, arrange dinners, etc.
- Added push notifications, social sign-ins (Google and Apple), CodePush, and Sentry for crash detection.
- Created several screens and layouts for the mobile application.
- Led a team of junior mobile developers, whom I supported in achieving the success of the product. Reviewed pull requests daily.
- Created Google Maps screens, Places API, Directions API, and Geofencing. Calculated travel distance for each destination.
- Developed a digital currency wallet screen that displayed the current balance.
- Added a chat feature using React Native Gifted Chat for the front end and Comet Chat for the engine.
React Native Developer
Fairmarket
- Developed a home management app in React Native using GraphQL and Apollo Client.
- Learned about Android instant apps and iOS 14 app clips.
- Created end-to-end tests using Appium and AWS Device Farm.
Mobile Developer
Scholly (via Toptal)
- Refactored the entire mobile app to fit high code quality standards.
- Updated the existing networking libraries to Retrofit and RxJava.
- Added new features and fixed bugs to an existing React Native project.
- Worked with different React workspaces (web and mobile).
- Performed several A/B testing variants with Firebase.
React Native Developer
Toyboy Warehouse
- Created an app very similar to Tinder to match people.
- Developed the popular Tinder's swipe-card animation.
- Coded the in-app purchases and push notifications.
- Created several animations using the Animated API.
React Native and Unity Developer
Client (via Toptal)
- Implemented a bridge from Unity to React Native by using native modules and callbacks.
- Created a CircleCI YML file to generate the library files automatically.
- Developed simple modules such as login, register, and friend list.
Freelance React Native Developer
Medvice
- Worked on an app that uses AI by answering a couple of questions, the app detects possible threats for the body and calls the ambulance if an urgent threat is determined. If there is no threat, you can chat with a doctor via text or voice using Matrix SDK and Jitsi Framework.
- Developed wrappers for React Native frameworks and coded them in Java (Android) and Objective-C (iOS) using native modules.
- Implemented via OpenGL an interactive human body where you can select parts of the body.
- Used TouchID, Firebase, and Google Sign for user authentication.
- Raised €80,000 at Rockstart Accelerator.
Full-stack Mobile Developer | Technical Director | Co-founder
Paisanos Creando
- Led front-end development for key startup MVPs, accelerating product validation timelines by over 30%.
- Implemented scalable UI components in React Native, reducing development time for future projects.
- Collaborated directly with clients and designers to transform wireframes into responsive, production-ready interfaces.
- Refactored legacy codebases, improving app performance and maintainability across multiple mobile projects.
- Built and shipped cross-platform apps for early-stage startups, achieving fast launches and investor demos.
- Contributed to internal tooling improvements, streamlining the team's development and testing workflows.
- Mentored junior developers and shared React Native best practices, fostering team growth and code quality.
- Helped define app architecture for modularity and reusability, improving scalability across client projects.
- Worked in Agile sprints with designers and PMs to deliver features on time while maintaining UI/UX quality.
Mobile Developer
Fyrastudio
- Developed a mobile game using canvas for Android. The game used the accelerometer to detect phone shakes. The canvas was for the progress of the points because it was circular, and at that time, there were no libraries to do that (2012).
- Learned about phone measuring tools of the phone like GPS, Compass, and Accelerometers used to build a game.
- Used camera API to scan QR code bars to be able to identify different products within the app.
- Developed a Bluetooth integration to connect to different devices.
Android Developer
Startup
- Created my first and own mobile product that showed the roadblocks of my city, similar to Waze—ultimately reaching over 50,000 users. Unfortunately, when Waze arrived in Buenos Aires, my project lost almost all its users.
- Improved my server-side code by using cache techniques to handle over 50,000 users.
- Created an API in PHP for the mobile application that showed the roadblocks and received roadblock requests from the users.
Experience
Bilt Rewards
https://apps.apple.com/us/app/bilt-rewards/id1565576987On this project, I added Google Analytics to improve user engagement. Used AI tools on a daily basis, such as Claude, Cursor, and Devin for PR reviews. Also, I made sure the production version of the app was stable. I fixed bugs and optimized render cycles to improve user behavior and analytics metrics.
CopilotIQ
https://mycopilotiq.com/I built the mobile application from scratch for Android, iOS, and web. The main challenge was supporting multiple platforms, screen sizes (phones, tablets, and desktops), and accessibility settings such as font scaling, since the platform was designed for older users. I implemented Twilio Video calling across Android, iOS, and web, as well as push notifications, CodePush, and Google Analytics. I managed CI/CD pipelines and mobile store approvals, contributed to the React-based web admin, and implemented caching techniques using AWS CloudFront.
Scholly Search
Scholly Math
My role at this project was to maintain the app, fix bugs, and deliver new screens that were needed from product team. This was done on React Native.
I also had to work with Appstore and playstore subscriptions.
Toyboy Warehouse
https://apps.apple.com/us/app/toyboy-warehouse/id1465752398My role at this job was to create a mobile app from scratch for Android and iOS using React Native. I learned a lot about animations and implemented the Tinder swipe left and right card effect using the Animated API. This app is a social network. I also added standard app features, such as code pushes, push notifications, and Google Analytics.
Fairmarket Home
My role in this project was to improve the existing mobile app in React Native. I added a 3D engine to the app to render the user's house and let the user tap which part of the house needs repair. I used Google Analytics, code push, added QA (automated tests), and used AWS Device Farm for this. I also managed App Store and Play Store submission.
Portfolio Sample App
https://d31v5j2okhcoa3.cloudfront.net/https://github.com/agusvazquez/portfolio-react-native-web
Football Watch Party
https://play.google.com/store/apps/details?id=com.football343.lfgI contributed to layouts from Figma files and worked on state management with sockets.
Play.google.com/store/apps/details?id=com.football343.lfg
Apps.apple.com/us/app/343-football-watch-party/id6779023200
Education
Bachelor's Degree in Software Engineering
University of Buenos Aires - Buenos Aires, Argentina
High School Diploma in IT (Information and Communication Technology)
ORT High School - Buenos Aires, Argentina
Certifications
Flutter
Udemy
Project Management Expert
Universidad Tecnologica Nacional
Skills
Libraries/APIs
React, React Navigation, React Native for Web, REST APIs, Socket.IO, React Hook Form, Node.js, Apollo Client, Stripe, API Development, Stripe API, Stripe Connect API, Retrofit, RxJava, RxJava 2, Retrofit 2, Google Maps, Google Places API, Google Maps API
Tools
Android Studio, Xcode, Redux Thunk, Git, Expo, TestFlight, Google Analytics, ExpoKit, Gradle, Sentry, GitHub, Twilio Programmable Video, React Apollo, ChatGPT, Claude Code, Claude, Figma, AWS Device Farm, Cucumber, CircleCI, Auth0, Amazon Cognito
Languages
JavaScript, Java, JavaScript 6, TypeScript, TypeScript 5, PHP, HTML, CSS, Swift, Objective-C, PHP 5, Kotlin, HTML5, GraphQL, Swift 4, SQL, Dart
Frameworks
React Native, Redux, Material UI, Spring Boot, Express.js, Spring, Unity3D, Unity, Jest, Flutter, Appium
Paradigms
Mobile Design, Mobile UI Design, UI Design, REST, Mobile Development, App Development, Agile Software Development, Web App Design, Scrum, HIPAA Compliance, UX Design
Platforms
iOS, Android, Firebase, Mobile, Amazon Web Services (AWS), Bitrise, Twilio, MacOS, BlackBerry, Vuforia, AWS Lambda, Visual Studio Code (VS Code)
Industry Expertise
Healthcare, Web Design, Project Management
Storage
MySQL, Amazon S3 (AWS S3), PostgreSQL, SQL Server 2008, Memcached
Other
Mobile Apps, Push Notifications, APIs, Software Engineering, Software, GitHub Actions, Mobile App Development, Front-end Architecture, User Experience (UX), Web Development, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Subscriptions, UI Engineering, User Interface (UI), App Store, Authentication, Minimum Viable Product (MVP), Cross-platform App Development, AI-assisted Development, Single Sign-on (SSO), Videos, Apollo, UI Animation, In-app Purchase (IAP), Monorepos, CI/CD Pipelines, Full-stack, Technical Leadership, WebSockets, Website Design, Lottie, Artificial Intelligence (AI), Full-stack Development, Large Language Models (LLMs), Cursor AI, HIPAA, CTO, AI Tools, AI-generated Code, GPS, SMS, Architecture, Software Architecture, Back-end, 3D, In-app Purchases, Serverless, Google Cardboard, FTP, Video Compression, Video Streaming, Streaming, A/B Testing, CodePush, Google Sign-in, Maps, Google Directions, Geofencing, IT Project Management, Fintech, Real-time Data
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring