Roshan is available for hire
Hire RoshanRoshan Gautam
Verified Expert in Engineering
React Native Developer
London, United Kingdom
Toptal member since June 8, 2022
Bio
Roshan enjoys working with React Native and React, which he has done for over seven years. He's eager for anything new that comes up in this ecosystem and tries to stay up to date whenever possible. Roshan has worked on products across fintech, entertainment, eCommerce, and more. Some of his recent work includes projects with Velocity Black, Goto, Virgin Hotels, and KaamKotha UK.
Portfolio
Colgate-Palmolive - Main
React Native, iOS
Runtriz
React Native, Progressive Web Applications (PWAs), Node.js, Expo
Villager Events Inc.
TypeScript, React Native, Redux, iOS, Android, Redux Thunk, Stripe Payments...
Experience
- React Native - 9 years
- React - 7 years
- JavaScript - 7 years
- TypeScript - 7 years
- Firebase - 6 years
- Redux - 4 years
- GraphQL - 3 years
- GitHub Actions - 2 years
Work Experience
React Native Expert
2024 - 2025
Colgate-Palmolive - Main
- Managed and reviewed the overall architecture of the mobile app for Colgate Whitening products.
- Organized several tech talks to teach the existing developers about best practices in React Native.
- Improved the performance of the app and reviewed and fixed performance issues in the long forms.
Technologies: React Native, iOS
Senior React Native Developer
2023 - 2023
Runtriz
- Performed on managing white-label applications in the hospitality industry. Worked on Virgin, CQ Hotels and other apps.
- Set up pipelines for automatically building and releasing the app to different stores.
- Fixed bugs and optimized the UI for better performance in a very complex codebase.
Technologies: React Native, Progressive Web Applications (PWAs), Node.js, Expo
React Native Developer with TypeScript Experience
2023 - 2023
Villager Events Inc.
- Improved the CI/CD pipeline to make releases automatic.
- Implemented Sentry to track bugs and upload source maps automatically.
- Improved the overall developer experience in the React Native app available on both web and mobile.
Technologies: TypeScript, React Native, Redux, iOS, Android, Redux Thunk, Stripe Payments, CircleCI, Jest, JavaScript
Senior React Native Engineer
2022 - 2023
Velocity Black
- Developed an app for a digital concierge provider that focuses on providing the best experience for the ones looking for a luxury lifestyle.
- Optimized codebase and performance of a mobile app built with React Native.
- Fixed critical bugs and delivered multiple features like bookings and seamless conversations.
Technologies: React Native, TypeScript, Redux
Senior React Native Engineer
2022 - 2023
Dyor Exchange
- Implemented secure biometrics login along with Keychain on iOS and Android.
- Improved CI/CD in order to facilitate automatic releases to the App Store and Play Store.
- Integrated on-ramp libraries like MoonPay for buying crypto tokens using Card/Apple Pay/Google Pay.
- Found and fixed a security bug that was exposing important keys and secrets.
- Implemented dark mode and light mode for better UI/UX improvements and participated in design meetings.
- Implemented other features, improved developer experience, and fixed crucial bugs.
Technologies: React Native, React Native for Web, Firebase
Front-end React Native Developer
2022 - 2023
SIA ABC Mobile IT
- Developed a bank app with features like bank transfer, cards, and crypto, as well as security features enabled like biometrics and passcode authentication.
- Set up CI/CD to deploy iOS and Android apps to their respective stores.
- Implemented the whitelisting feature for the mobile app so that new similar apps can be generated with simple configuration changes.
- Coached two front-end developers working together on the mobile application.
- Developed the bank transfer feature for different currencies (USD, EUR, GBP).
Technologies: React Native, CI/CD Pipelines, Mobile Apps, GitLab CI/CD, Fastlane, CodePush, Visual Studio App Center, Mobile Development, Mobile App Development, Architecture, Cross-platform, Startups, User Experience (UX)
Senior React Native Developer
2022 - 2022
Immerciv Inc.
- Worked on performance issues and refactored a bunch of code to make it look modern.
- Resolved some serious bugs to make the app more stable.
- Integrated Branch to make deep linking more robust.
- Managed infrastructure of the expo app which included easy builds, expo updates, and configuration plugins.
Technologies: React Native, Firebase, Audio Processing, Maps, Mobile Development, Mobile App Development, Cross-platform, React Native for Web
Senior React Native Engineer
2021 - 2022
Goto
- Developed the entire break-out room feature for mobile devices.
- Made webpack work on React Native to enable code-splitting, tree-shaking, and more.
- Promoted best practices within the team about React and React Native using code reviews as examples. Held regular technical sessions.
- Interviewed several candidates and worked with the external teams on different collaborations.
Technologies: React Native, TypeScript, Objective-C, Java, Jenkins, GitHub Actions, Mobile, REST, Front-end, Accessibility, Mobile Development, Mobile App Development, Cross-platform, User Experience (UX)
Senior Software Engineer
2018 - 2021
Brainants Technology Pvt
- Developed a fintech application that allowed users to make and receive payments in a conversation.
- Developed an over-the-air update system like CodePush from scratch.
- Mentored and managed developers and engineers and managed clients.
- Co-founded the company with some college friends and helped it grow to have more than 12 employees.
- Worked on an educational product from scratch that helped many students.
Technologies: TypeScript, JavaScript, React Native, Firebase, Node.js, Mobile, REST, Front-end, Near-field Communication (NFC), Expo, Mobile Development, Mobile App Development, Architecture, Cross-platform, Startups, Web Development, User Experience (UX)
Software Engineer
2016 - 2018
Bajra Technologies
- Developed a social music app to enable people to choose the music they wanted to play in a bar or pub.
- Used SQLite on mobile devices to manage the offline music storage and update the data on demand.
- Handled the whole release processes for the back end and mobile on the Google Play Store and the App Store.
Technologies: Ruby on Rails (RoR), Angular, React Native, Docker, Mobile, REST, Front-end, iOS, Mobile Development, Mobile App Development, Cross-platform
Mobile Developer
2014 - 2016
Freelance
- Built a project management and field app that lets users add different projects and related data.
- Developed offline-first features such as caching the requests and syncing later when the internet is available.
- Constructed a mobile app for a news portal based on WordPress APIs.
Technologies: Android, Node.js, Redux, React Native, REST, Mobile Development, Mobile App Development
Project History
GoTo App
This React Native application allows users to join or create a mobile, desktop, and web meeting. It also has a fully-featured phone and messaging solution. I worked as an engineer for the core meeting product used by different host applications like GoTo Connect and GoTo Room.
Virgin Hotels
A white-label React Native/Expo app for a lifestyle hotel business. I maintain a complex codebase shipped to tens of thousands of people. The app allows users to make a reservation, do mobile check-in, and provide information about different facilities in the hotel.
KaamKotha UK
KaamKotha UK is a social network application that intends to help Nepalese living in the UK find rooms and jobs. I built this app from scratch, architected the app's front and back end, and developed and released multiple features essential to the community.
A Streaming Service Similar to Twitch
This is a streaming service like Twitch but for a niche group of people. I started the project and set up the architecture for its mobile and web applications. It also had a real-time chat feature along with streaming.
Fintech App with a Social Component
This fintech app allows users to make and receive payments from their friends and vendors, and I worked as a consultant React Native engineer to help the team develop this application. I was involved in activities ranging from requirement engineering to feature engineering.
Apartment Booking App for Popular Tourist Islands
A React/React Native-based web and mobile application for booking holiday apartments and houses in a few popular islands. This application digitalized a lot of manual work regarding apartment and service booking.
Skills
Libraries/APIs
React, REST APIs, React Native for Web, Node.js, WebRTC
Tools
Expo, Jenkins, Webpack, GitLab CI/CD, Figma, Fastlane, Visual Studio App Center, Redux Thunk, CircleCI
Languages
TypeScript, JavaScript, GraphQL, Objective-C, Java
Frameworks
React Native, Redux, Ruby on Rails (RoR), Angular, Next.js, Jest
Paradigms
REST, Mobile Development, Cross-platform
Platforms
Firebase, Mobile, Docker, Android, iOS
Other
APIs, Mobile Apps, Front-end, Mobile App Development, Serverless, Architecture, Startups, Web Development, User Experience (UX), Chatbots, Accessibility, GitHub Actions, Near-field Communication (NFC), Audio Processing, Maps, CI/CD Pipelines, CodePush, Stripe Payments, Progressive Web Applications (PWAs), AI Chatbots
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