Varun Mehta
Mobile & Web Engineer
Singapore
Summary
Lead Mobile Developer with 13+ years building and shipping customer-facing iOS and cross-platform apps end to end, from concept to App Store/Play Store launch, across IoT, Banking, Telco, Web3, and CRM domains. Extensive experience in Mobile Applications and Tooling: Swift, SwiftUI, Objective‑C, RxSwift, Combine, XCTest, XCUITest, AppCenter, Amplitude, Firebase; React Native, React, TypeScript, Next.js Redux/Toolkit, MobX; CI/CD with Jenkins/Bamboo, Bitbucket/Git, SonarQube. Experience with BE technologies like AWS Cloud, SQL Server, FastAPI, Docker and managed continuos delivery using Bamboo/Jenkins. Strong product mindset with measurable outcomes: improved OCBC app rating from 1.8 to 4.5 via security, integrations and performance improvements; scaled IKEA Home Smart to 600,000 users across 55 countries. Built YesGenie React Native app from scratch, enabling 100% mobile platform expansion and reducing development effort by ~30% via shared codebase. Boosted user engagement by ~25% by revamping Web3 DeFi Home/Settings and launching Matic Staking, BRC Deploy, and enhanced Transaction History. Migrated DeFi module from Objective-C to Swift, improving app stability (↓ crashes ~20%) and increasing code maintainability and test coverage by ~40%.
Overview
16
16
years of professional experience
Work History
Lead Engineer
Singtel
10.2024 - Current
- Led the development and maintenance of Singtel Heya and Hi Prepaid’s mobile applications, ensuring a seamless and user-friendly experience for customers and retailers.
- Architected and implemented scalable, secure, and high-performing mobile solutions to support features such as prepaid transaction for new or existing customers, MFA integration for secure and fast login for Retailers/Consumers, User eSim purchase journey and pSim to eSim conversion.
- Collaborated with cross-functional teams, including product managers and UX/UI designers, to design and deliver new features.
- Migrated Gatsby based web application to Next.js and Nx based monorepo.
- Tech Stack: React Native, React.js, Typescript, Next.js, Swift, Objective-C, Redux, Saga, Jest, HTML5, Bitbucket, Sonarqube, AWS Cloud, Bamboo
Lead Engineer
OKX: Buy Bitcoin BTC & Crypto
10.2022 - 05.2024
- Led cross-functional teams to successfully deliver major feature releases in the DeFi space, including Token Invest/Redeem, Wallet Onboarding, BRC-20 Deploy, Home & Search Page Revamp, Invest Transactions Update, Product Search, and Certik Security enhancements.
- Spearheaded the modernization of legacy code, converting 90% of the codebase from Objective-C to Swift while adhering to SOLID design principles and the MVVM design pattern, significantly improving code maintainability and performance.
- Established best practices for code quality by implementing systems for Unit Testing, linting, and peer code reviews, fostering a culture of accountability and continuous improvement.
- Delivered technical knowledge-sharing on multiple Web3 training sessions and authored technical documentation to elevate team expertise and innovation.
- Tech Stack: Swift, SwiftUI, RxSwift, Combine, Objective-C, REST, GIT, AppCenter, Amplitude, XCTest, XCUITest, Quick, Nimble.
Technical Lead
OCBC Digital Banking
03.2020 - 10.2022
- Led a team of 5 React developers, ensuring timely delivery of key features within the OpenBanking module like SGFinDex, IRAS and driving collaboration and alignment across the team.
- Spearheaded the integration of complex systems, including IRAS Income/Property Tax, ensuring seamless functionality and compliance with the app.
- Oversaw the implementation and migration of all iOS plugins, including the Vkey security SDK, leading to enhanced security and performance.
- Managed critical security features, including single sign-on and multi-factor authentication (SingPass), strengthening user authentication and security protocols.
- Established DeviceFarm infrastructure to enable parallel and automated testing, significantly improving the efficiency and reliability of testing processes.
- Developed a custom crash analytics module, boosting application performance and stability by proactively identifying and resolving critical issues.
- Tech Stack: React.js, Javascript, HTML5, CSS3, Swift, Objective-C, Cordova, SCSS, REST, Sonarqube, Experitest Cloud, VKey SDK, Firebase, AppDynamics, Zeplin, Jenkins, GIT, JIRA, Confluence
Lead Consultant
XebiaLabs
08.2019 - 03.2020
- CRM mobile solution to provide 360 degree view of the customer and help relationship manager to create more leads and turn prospects into future customers.
- Transform web app to full fledged React Native mobile app in 3 months.
- Oversaw the implementation of all iOS Native Plugins for the app like Push Notification, QR Code Scanner etc.
- Tech Stack: React Native, HTML, CSS, Javascript, Swift, Objective-C, Adobe Campaign, Jenkins, Invision, GIT, JIRA, Confluence
Technical Lead
Altran Technologies
05.2015 - 07.2019
- Led a team of 5 iOS developers in the successful delivery of features for an IoT-based Home Automation app, currently live in 55 countries with 600,000 active users.
- Key contributor to the end-to-end development of the solution, collaborating with a highly skilled team to take the project from concept to a live product on the App Store.
- Mentored and supported team members in their professional growth through performance reviews, 1:1 feedback sessions, and personalized career growth plans, fostering a culture of continuous development.
- Designed and implemented the App Automation framework using XCUITest, streamlining testing and improving the overall development process.
- Actively participated in requirement analysis and design reviews, ensuring alignment between technical solutions and business goals.
- Tech Stack: Swift, Objective-C, RxSwift, XCTest, XCUITest, IoT Home Automation, Logentries, Jenkins, Zeplin, GIT, JIRA, Confluence
Sr. Mobile Developer
IBM
07.2013 - 05.2015
- Stay in the comfort of your vehicle while you pay for fuel with your phone. Say goodbye to taking your wallet out and swiping your credit card at the pump. Integrated with Stripe to track your payments while in process.
- Tech Stack: React.js, HTML5, CSS3, Javascript, IBM Worklight, GIT, JIRA, Confluence
- Converted client PoC to client project.
Sr. Mobile Developer
TCS Siruseri
08.2010 - 07.2013
- Travel management application for end customer to help them book tickets and enrich their travel experience. Provide all travel related services to end customers and help them get rewards for their journey.
- Tech Stack: Objective-C, Jenkins, GIT, Gerrit, XCTest, Zeplin, JIRA, Confluence
Education
Bachelor of Science - Information Technology
YMCA Institute of Engineering
India 04.2001 -
Skills
React Native, Expo, Reactjs, Nextjs
Redux, Redux Toolkit, MobX
Xcode, Swift, SwiftUI, Objective-C
RxSwift, Combine, Async/Await, SnapKit
XCTest, XCUITest, Quick, Nimble
MVVM, MVP, VIPER, SOLID principles
AWS Cloud, SQL Server, FastAPI, Docker
Cross-functional team management
GIT, Gerrit, Jenkins, Bamboo, CI/CD Automation
Accomplishments
- Recipient of the HCL Star Award for leading efforts that improved the OCBC Digital app’s rating on the App Store from 1.8 to 4.5, demonstrating a strong focus on user experience and product quality.
- Awarded the IBM Eminence & Excellence Award, recognizing leadership in securing a high-profile client project with ExxonMobil through technical excellence and strategic innovation.
- Instrumental in helping OCBC secure the Industry-Wide Excellence Award from OpenGov Asia by leading the IRAS Tax Payment initiative, showcasing innovation and delivering impactful solutions that set industry benchmarks.
Timeline
Lead Engineer
Singtel
10.2024 - Current
Lead Engineer
OKX: Buy Bitcoin BTC & Crypto
10.2022 - 05.2024
Technical Lead
OCBC Digital Banking
03.2020 - 10.2022
Lead Consultant
XebiaLabs
08.2019 - 03.2020
Technical Lead
Altran Technologies
05.2015 - 07.2019
Sr. Mobile Developer
IBM
07.2013 - 05.2015
Sr. Mobile Developer
TCS Siruseri
08.2010 - 07.2013
Bachelor of Science - Information Technology
YMCA Institute of Engineering
04.2001 -
ORGANISATION
- BILLIGENCE (10/2024 - PRESENT)
- OKX SINGAPORE (10/2022 - 05/2024)
- HCL SINGAPORE (03/2020 - 10/2022)
- XEBIA (08/2019 - 03/2020)
- ALTRAN (05/2015 - 07/2019)
- IBM INDIA PVT. LTD. (07/2013 - 05/2015)
- TATA CONSULTANCY PVT. LTD. (05/2010 - 06/2013)