Agustin is available for hire

Agustin Vazquez

Verified Expert in Engineering

Mobile Developer

Trevelin, Chubut Province, Argentina

Toptal member since January 21, 2019

Expertise

Software Development Front End Android Xcode Git iOS Java React Native Google Analytics JavaScript REST API Redux

Bio

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

Bilt Technologies Inc

TypeScript, React, JavaScript, React Native, Git, Redux, User Experience (UX)...

CopilotIQ

React Native, React, Firebase, Twilio Programmable Video, Android, iOS, Mobile...

HUB International - TCG

iOS, React Native, Android, Amazon Cognito, Mobile Apps, Mobile, JavaScript 6...

Experience

Android - 14 years
iOS - 12 years
React Native - 8 years
MySQL - 5 years
Sentry - 5 years
Amazon Web Services (AWS) - 3 years
Spring Boot - 3 years
GraphQL - 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

Senior Front-end Developer

2025 - 2026

Bilt Technologies Inc

Worked on mostly maintenance tasks and bug fixing, and added some basic UI features.
Added Google Analytics to the project to ensure proper user behavior tracking.
Created a new merchant portal to CURD offers and journeys into the system.
Learned how AI works and widely used Cursor and Claude in this project.

Technologies: TypeScript, React, JavaScript, React Native, Git, Redux, User Experience (UX), Visual Studio Code (VS Code), MacOS, Xcode, CodePush, GitHub, React Navigation, Mobile App Development, Front-end Architecture, REST APIs, Fintech, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Expo, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), Artificial Intelligence (AI), REST, ChatGPT, Claude Code, Large Language Models (LLMs), Cursor AI, TestFlight, Claude, AI Tools, App Development, AI-generated Code, Google Analytics, App Store, Authentication, Mobile Apps

React Native and React Web Developer

2022 - 2025

CopilotIQ

Created a user-facing app supported on Android, iOS, and the web, using the React Native for Web library that supported all different screen sizes (phone, tablet, and desktop).
Implemented Twilio Voice and Twilio Video modules on React Native and React (web).
Contributed to a React web project (admin for nurses).
Enabled push notifications API, CodePush, and Google Analytics.

Technologies: React Native, React, Firebase, Twilio Programmable Video, Android, iOS, Mobile, Mobile Apps, JavaScript 6, TypeScript, APIs, GitHub, GitHub Actions, React Apollo, Apollo, 3D, Gradle, Jest, JavaScript, Mobile App Development, Front-end Architecture, GraphQL, User Experience (UX), CI/CD Pipelines, REST APIs, Monorepos, CodePush, Sentry, Redux Thunk, Xcode, Android Studio, Amazon S3 (AWS S3), Agile Software Development, Java, Git, Visual Studio Code (VS Code), MacOS, Swift, Push Notifications, Google Maps, React Navigation, React Native for Web, Stripe, HIPAA Compliance, Web Development, RESTFul APIs, Front-end Development, Front-end, API Integration, HTML, CSS, Mobile Architecture, Stripe API, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), Website Design, Web Design, Lottie, Full-stack Development, REST, Twilio, HIPAA, Videos, Mobile Development, TestFlight, App Development, Google Analytics, App Store, Authentication, Web App Design, HTML5, Minimum Viable Product (MVP)

React Native Developer

2022 - 2022

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.

Technologies: iOS, React Native, Android, Amazon Cognito, Mobile Apps, Mobile, JavaScript 6, TypeScript, APIs, GitHub, Gradle, JavaScript, Mobile App Development, Front-end Architecture, User Experience (UX), REST APIs, Redux Thunk, Xcode, Android Studio, Git, Visual Studio Code (VS Code), MacOS, CircleCI, React, Push Notifications, Sentry, CodePush, React Navigation, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), REST, Mobile Development, TestFlight, App Development, Google Analytics, App Store, Authentication, Minimum Viable Product (MVP)

React Native Developer

2022 - 2022

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.

Technologies: React Native, React, Android, iOS, Auth0, Push Notifications, Sentry, CodePush, Firebase, Mobile, Mobile Apps, JavaScript 6, TypeScript, APIs, GitHub, JavaScript, Mobile App Development, Front-end Architecture, User Experience (UX), REST APIs, Redux Thunk, Xcode, Android Studio, Agile Software Development, Git, Visual Studio Code (VS Code), MacOS, CircleCI, Google Sign-in, Google Maps, Google Places API, React Navigation, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Stripe API, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), Lottie, REST, Mobile Development, TestFlight, Stripe Connect API, App Development, App Store, Authentication, Minimum Viable Product (MVP)

React Native Developer

2020 - 2020

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.

Technologies: AWS Device Farm, Appium, GraphQL, iOS, Android, React Native, TypeScript, Sentry, Firebase, JavaScript 6, TypeScript 5, Jest, GitHub, Mobile, Mobile Apps, React Apollo, Apollo, Apollo Client, Gradle, JavaScript, Mobile App Development, Front-end Architecture, User Experience (UX), CI/CD Pipelines, REST APIs, Cucumber, Redux Thunk, Xcode, Android Studio, Git, Visual Studio Code (VS Code), MacOS, React, Push Notifications, CodePush, Google Sign-in, React Navigation, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), REST, Mobile Development, TestFlight, Stripe Connect API, App Development, Google Analytics, App Store, Authentication, Minimum Viable Product (MVP)

Mobile Developer

2019 - 2020

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.

Technologies: React Native, In-app Purchases, Android, RxJava, Retrofit, Java, TypeScript, Gradle, Firebase, CodePush, GitHub, APIs, JavaScript 6, TypeScript 5, In-app Purchase (IAP), Sentry, Mobile App Development, User Experience (UX), REST APIs, A/B Testing, Redux Thunk, Xcode, Android Studio, Mobile, iOS, Git, Visual Studio Code (VS Code), MacOS, Front-end Architecture, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Subscriptions, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), REST, Mobile Development, TestFlight, App Development, Google Analytics, App Store, Authentication, Mobile Apps, Minimum Viable Product (MVP)

React Native Developer

2019 - 2019

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.

Technologies: Firebase, JavaScript, React Native, TypeScript, Mobile App Development, Front-end Architecture, User Experience (UX), REST APIs, Redux Thunk, Xcode, Android Studio, Android, Mobile, iOS, Git, Visual Studio Code (VS Code), MacOS, In-app Purchases, React, Push Notifications, Sentry, CodePush, GitHub, React Navigation, CI/CD Pipelines, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Subscriptions, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), REST, Mobile Development, TestFlight, App Development, Google Analytics, App Store, Authentication, Mobile Apps, Minimum Viable Product (MVP)

React Native and Unity Developer

2019 - 2019

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.

Technologies: Objective-C, Swift, Android, React Native, Unity, TypeScript, JavaScript, Mobile App Development, Front-end Architecture, User Experience (UX), REST APIs, Xcode, Android Studio, Mobile, iOS, Git, Visual Studio Code (VS Code), MacOS, React, GitHub, React Navigation, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), REST, Mobile Development, TestFlight, App Development, App Store, Mobile Apps

Freelance React Native Developer

2018 - 2018

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.

Technologies: iOS, Android, Project Management, Redux, JavaScript, React Native, Mobile App Development, Front-end Architecture, User Experience (UX), REST APIs, Redux Thunk, Xcode, Android Studio, Mobile, Git, Visual Studio Code (VS Code), MacOS, Push Notifications, Sentry, GitHub, React Navigation, TypeScript, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Expo, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), REST, Mobile Development, TestFlight, App Development, App Store, Authentication, Mobile Apps, Minimum Viable Product (MVP)

Full-stack Mobile Developer | Technical Director | Co-founder

2013 - 2018

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.

Technologies: Project Management, JavaScript, CSS, HTML, Unity3D, 3D, Unity, Git, Bitrise, Amazon Web Services (AWS), MySQL, PHP, Spring, Java, React Native, iOS, Android, GitHub, Sentry, CodePush, Firebase, Mobile, Mobile Apps, APIs, Node.js, Mobile App Development, Google Maps API, Video Streaming, User Experience (UX), CI/CD Pipelines, REST APIs, Video Compression, Google Cardboard, FTP, Xcode, Android Studio, AWS Lambda, Amazon S3 (AWS S3), Vuforia, Agile Software Development, SQL Server 2008, PHP 5, Serverless, Scrum, Spring Boot, Visual Studio Code (VS Code), MacOS, SQL, Swift, Streaming, React, Push Notifications, Google Sign-in, Maps, Google Maps, Google Places API, Geofencing, React Navigation, React Native for Web, Front-end Architecture, Stripe, RESTFul APIs, Front-end Development, Front-end, API Development, API Integration, Full-stack, Technical Leadership, WebSockets, Mobile Architecture, Stripe API, Subscriptions, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), Lottie, Full-stack Development, REST, Socket.IO, Kotlin, Videos, Mobile Development, CTO, TestFlight, App Development, App Store, Authentication, Minimum Viable Product (MVP)

Mobile Developer

2012 - 2013

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.

Technologies: BlackBerry, iOS, Android, Java, Mobile App Development, User Experience (UX), REST APIs, Xcode, Android Studio, Mobile, Git, MacOS, Maps, Google Maps, GitHub, Front-end Architecture, RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), REST, Mobile Development, TestFlight, App Development, App Store, Authentication, Mobile Apps, Minimum Viable Product (MVP)

Android Developer

2011 - 2012

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.

Technologies: PHP, MySQL, Android, Java, REST APIs, Android Studio, Mobile, Git, Maps, GitHub, Mobile App Development, Front-end Architecture, User Experience (UX), RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Mobile Design, Mobile UI Design, UI Design, UI Engineering, User Interface (UI), REST, Mobile Development, App Development, Authentication, Mobile Apps

Experience

Bilt Rewards

https://apps.apple.com/us/app/bilt-rewards/id1565576987

Bilt helps you transform your largest monthly expense—rent—into valuable rewards and unlock exclusive Neighborhood Benefits™. With Bilt, you can earn points on rent payments, build credit history, and unlock a world of rewards from travel to everyday redemptions.

On 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/

CopilotIQ is a shared-code web and mobile application that enables patients to communicate with doctors through the Twilio Video SDK while providing access to charts and medical data. The platform also includes a web admin where nurses can view patient information and manage patient calls.

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 takes the hassle out of the scholarship search process so you can focus on what’s important—getting free money for school. We have helped students win over $100 million in scholarships so far. My role on this project was to build the mobile app from scratch. The main challenge on this project was handling Google Play subscriptions and adding push notifications.

Scholly Math

Struggling with your math homework or preparing for an upcoming exam? Scholly Math has you covered! Scholly Math is an AI-powered math solver that instantly interprets and solves any type of math problem, from basic arithmetic to complex calculus proofs.

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/id1465752398

Toyboy Warehouse is the UK’s largest cougar dating app for older women and younger men. Founded over a decade ago, Toyboy Warehouse has helped tens of thousands of mature women and younger men find love, lust, and romance. Join and start searching today.

My 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.

We Cover

https://wecover.co/

We Cover is a React Native-based mobile application that allows users to protect assets such as bicycles, phones, and cars. Users can register their items and valuations, after which the platform calculates a daily protection fee. Coverage can be enabled or disabled directly from the app, with charges applied only while protection is active. In the event of a loss or incident, users can also submit claims through the application.

I implemented the mobile application in React Native, focusing on the functionality for enabling and disabling coverage on user assets. I also implemented CodePush, push notifications, and Google Analytics, and managed deployments and releases for both the Apple App Store and Google Play Store.

Fairmarket Home

Fairmarket is a revolutionary platform for homeowners and contractors. However, it is not just a platform; it is a powerful, full-range, deeply personalized home improvement and management app, the first of its kind.

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/

This is a sample app I developed to work with Animations and React Native for the web, and I built a personal app to showcase to clients. It contains the swipe left or right, similar to the Tinder effect, that was done manually. You can check the code on my GitHub.

https://github.com/agusvazquez/portfolio-react-native-web

Education

2008 - 2014

Bachelor's Degree in Software Engineering

University of Buenos Aires - Buenos Aires, Argentina

2001 - 2007

High School Diploma in IT (Information and Communication Technology)

ORT High School - Buenos Aires, Argentina

Certifications

SEPTEMBER 2019 - PRESENT

Flutter

Udemy

SEPTEMBER 2017 - PRESENT

Project Management Expert

Universidad Tecnologica Nacional

Skills

Libraries/APIs

React, React Navigation, React Native for Web, REST APIs, Socket.IO, 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, GitHub, Twilio Programmable Video, React Apollo, ChatGPT, Claude Code, Claude, AWS Device Farm, Gradle, Cucumber, CircleCI, Auth0, Sentry, 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, 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

Platforms

iOS, Android, Mobile, Firebase, Amazon Web Services (AWS), Bitrise, Twilio, MacOS, BlackBerry, Vuforia, AWS Lambda, Visual Studio Code (VS Code)

Storage

MySQL, Amazon S3 (AWS S3), SQL Server 2008, Memcached

Industry Expertise

Web Design, Project Management

Other

Mobile Apps, APIs, Software Engineering, Software, GitHub Actions, Mobile App Development, Front-end Architecture, User Experience (UX), RESTFul APIs, Front-end Development, Front-end, API Integration, Mobile Architecture, Subscriptions, UI Engineering, User Interface (UI), App Store, Authentication, Minimum Viable Product (MVP), Videos, Apollo, UI Animation, In-app Purchase (IAP), Monorepos, CI/CD Pipelines, Web Development, 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, 3D, In-app Purchases, Serverless, Google Cardboard, FTP, Video Compression, Video Streaming, Streaming, A/B Testing, Push Notifications, CodePush, Google Sign-in, Maps, Google Directions, Geofencing, IT Project Management, Fintech

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