Iswan is available for hire
Hire IswanIswan Jumat
Verified Expert in Engineering
Front-end Developer
Kuala Lumpur Federal Territory of Kuala Lumpur, Malaysia
Toptal member since December 1, 2020
Bio
Iswan is a seasoned tech lead and full-stack JavaScript engineer with over 13 years of experience building web and mobile applications. He brings deep expertise in front-end architecture and has led delivery across industries, including real estate, eCommerce, livestock auction operations, government services, and travel. He's known for applying the right technology to the right problem, from rapid prototyping to scalable production systems.
Portfolio
AirAsia Move
JavaScript, TypeScript, React, React Native, TanStack Query, Monorepos, Agile...
Ace Resource Advisory Services Sdn. Bhd. (via TechTiera)
JavaScript, TypeScript, React, React Native, Node.js, Express.js, PostgreSQL...
CIMB Bank Malaysia
JavaScript, TypeScript, Microfrontends, Nx, Monorepos, NgRx, SCSS, Jira, Agile...
Experience
- Web Application Architecture - 12 years
- Front-end - 12 years
- JavaScript - 12 years
- React - 10 years
- React Native - 8 years
- Mobile - 7 years
- Test-driven Development (TDD) - 6 years
- Expo - 1 year
Preferred Environment
Amazon Web Services (AWS), MacOS, Windows, Linux
The most amazing...
...and world’s largest OTA apps rewrote its hotel module using Expo for both web and mobile, within a monorepo architecture, to scale and serve millions of users.
Work Experience
Technology Lead
2025 - PRESENT
AirAsia Move
- Led the development of the Hotel module in the AirAsia Super App, driving feature enhancements and performance improvements across platforms.
- Led the rewriting of the Hotel module into a unified codebase, rebuilding it with Expo to enable a single cross-platform implementation.
- Architected and rebuilt the Payment Widget Library in React Native, boosting rendering performance by 35% and enabling its flexible use as a one-page checkout experience across multiple products.
- Mentored engineers through code reviews and architectural guidance, improving code quality, reducing production defects, and fostering a culture of technical ownership and continuous improvement.
Technologies: JavaScript, TypeScript, React, React Native, TanStack Query, Monorepos, Agile, Front-end, Redux, Test-driven Development (TDD), Git, Mobile, Security, General Data Protection Regulation (GDPR), Monotrepo, UniStyle
Senior Software Engineer
2023 - 2024
Ace Resource Advisory Services Sdn. Bhd. (via TechTiera)
- Led the development of an IoT application, integrating data visualization with dynamic charts and reports, resulting in a 20% increase in data visualization clarity.
- Optimized the front-end rendering performance using advanced React techniques to achieve a 30% reduction in page load times.
- Enhanced back-end data fetching efficiency in Node.js by implementing caching mechanisms and query optimization strategies, decreasing query response times by an average of two seconds.
- Documented architectural designs and best practices, fostering knowledge sharing within the team.
Technologies: JavaScript, TypeScript, React, React Native, Node.js, Express.js, PostgreSQL, HTML, CSS, Software Architecture, Data Visualization, Git, Security, General Data Protection Regulation (GDPR)
Senior Developer
2022 - 2023
CIMB Bank Malaysia
- Designed and architected front-end systems and components that align with the company's goals and vision.
- Collaborated with cross-functional teams, including designers, product managers, and back-end developers, to ensure seamless integration of front-end and back-end systems.
- Led front-end developers to deliver high-quality and scalable web applications.
- Contributed to the development of advanced features for a self-serve wealth platform.
Technologies: JavaScript, TypeScript, Microfrontends, Nx, Monorepos, NgRx, SCSS, Jira, Agile, Jest, Angular, Webpack, Fintech, Node.js, API Integration, Software Architecture, Data Visualization, Git, Security, General Data Protection Regulation (GDPR), Monotrepo
Lead React Native Mobile App Developer
2022 - 2023
OGUR Jobs
- Built an Android and iOS app that enables convenient cargo payments for users.
- Increased the page loading speed by replacing the old API requests using Redux Thunk with the React Query library. This resulted in a three times improvement in the page loading speed.
- Developed a video resume recording feature that allows users to record short videos and include them with their online resume.
- Guided and mentored the mobile app development team, providing expert code reviews and consultations.
Technologies: React Native, SQL, MySQLi, Amazon Web Services (AWS), Expo.io, React Query, Front-end Development, APIs, Mobile, Functional Programming, Unit Testing, Firebase Cloud Messaging (FCM), REST, GitHub, Code Review, Design Patterns, Expo, Leadership, Node.js, Webpack, Early-stage Startups, JavaScript, Cross-platform, Android App Development, Testing, Hybrid Apps, Mobile App Development, Software Architecture, Google Play Store, App Store, Git, Security
React Native Developer
2021 - 2022
Jetstream Global Inc.
- Developed an Android and iOS app that helps people make cargo payments.
- Boosted page loading time up to three times by translating old API requests to SWR queries.
- Wrote a custom hook to integrate the React Native mix panel library to track user events.
- Implemented a feature to pay by cheque using the image capture plugin.
- Developed UI components using customized RNUILib to match the UI designs.
Technologies: React, React Native, Firebase, SWR, JSX, ClickUp, Visual Studio App Center, Startups, Architecture, Android, iOS, Google Play Store, App Store, CI/CD Pipelines, Expo, Expo.io, Front-end Development, APIs, Mobile, Payment APIs, Functional Programming, Unit Testing, Firebase Cloud Messaging (FCM), D3.js, REST, GitHub, Code Review, Design Patterns, Leadership, Node.js, Webpack, Early-stage Startups, JavaScript, Cross-platform, Android App Development, Testing, API Integration, Hybrid Apps, Mobile App Development, Git, Security
Front-end Developer
2019 - 2021
Archisoft Global Sdn Bhd
- Developed an Android, iOS, and web app that helps real estate agents increase productivity and manage all leads (customers) and workflow on the go.
- Collaborated with product managers, business analysts, UI/UX designers, and other team members to deliver project requirements, goals, and desired functionalities.
- Led the mobile app development team, including code reviews and consultations.
- Integrated build pipelines to publish apps to the App Store and Google Play using Visual Studio App Center.
- Improved the quality of web and mobile apps through performance tuning and code refactoring.
- Created a React Native startup project with basic authentication and a settings menu to communicate with the company's back-end REST API.
Technologies: Firebase Cloud Messaging (FCM), Formik, CodePush, iOS, Android, Redux, React Navigation, ES7, Next.js, Git, React Native, React, JavaScript, HTML, CSS, Visual Studio App Center, CI/CD Pipelines, Visual Studio Code (VS Code), REST APIs, React Redux, HTML5, Architecture, JSX, React Router, Code Review, Design Patterns, Leadership, Responsive Web Design (RWD), Front-end Development, APIs, Mobile, Functional Programming, Unit Testing, REST, GitHub, Node.js, Webpack, Early-stage Startups, Cross-platform, Android App Development, Testing, Hybrid Apps, Mobile App Development, Google Play Store, App Store, Security
Associate Technical Lead
2019 - 2019
Auxenta (Pvt) Ltd
- Led the front-end development team, including code reviews and consultations.
- Finished the first phase of the investment management system for a UK-based company, enabling employees to track and increase the productivity of workflows.
- Built an advanced and fully customizable dashboard with D3 charts and react-beautiful-dnd to display 16 reports.
- Performed maintenance, performance tuning, and code refactoring to improve the quality of the codebase.
- Proposed a new model for state management with React Hooks and context API to reduce boilerplate when using Redux.
Technologies: AWS Lambda, D3.js, React Redux, Redux Form, Git, ECMAScript (ES6), Sass, Redux-Saga, Redux, React, JavaScript, HTML, Front-end, CSS, Amazon DynamoDB, Visual Studio Code (VS Code), Unit Testing, REST APIs, HTML5, Architecture, JSX, Startups, React Router, Web Application Architecture, Code Review, Design Patterns, Leadership, Responsive Web Design (RWD), Front-end Development, Full-stack Development, APIs, Data Visualization, Mobile, Node.js, Functional Programming, REST, GitHub, TypeScript, Full-stack, Express.js, MongoDB, Webpack, Early-stage Startups, Testing
Senior Software Engineer
2018 - 2019
ThinkCube Systems (Pvt) Ltd
- Led the EGN mobile application development team, including code reviews and consultations.
- Built a database-driven localization system for React Native to support multiple languages.
- Created a React Native schema-based form generation and form validation library to support multiple languages.
- Wrote unit tests and snapshot tests with Jest to maintain good test coverage.
- Built reusable React Native components to use with two React Native applications.
- Developed an offline, first Electron desktop app by reusing existing front-end UIs and SQLite database.
- Integrated test pipelines using GitLab CI/CD to run unit and lint tests before merging pull requests.
- Replaced React Navigation with React Native Navigation to increase navigation performance.
Technologies: User Interface (UI), ECMAScript (ES6), JavaScript, REST APIs, Android, Node.js, SQLite, Electron, Jest, User Experience (UX), Google Maps, Couchbase Lite, Redux, React Native, React, Mobile, Front-end, Visual Studio Code (VS Code), Unit Testing, React Redux, React Native Navigation, Flux, HTML5, Architecture, TypeScript, JSX, Startups, React Router, Web Application Architecture, Code Review, Leadership, Responsive Web Design (RWD), Full-stack, Front-end Development, Full-stack Development, Bluetooth, APIs, Data Visualization, Styled-components, Sass, Payment APIs, Functional Programming, Firebase Cloud Messaging (FCM), REST, GitHub, Express.js, MongoDB, Webpack, Early-stage Startups, Cross-platform, Android App Development, Testing, API Integration, Hybrid Apps, Mobile App Development
Senior UI Engineer
2014 - 2017
ThinkCube Systems (Pvt) Ltd
- Built a design system for company projects based on React.
- Created a fully functional front end for the online MCQ exam platform, using jQuery to integrate with the company's e-learning platform.
- Developed the first React Native project for a livestock auction platform in Australia that includes Bluetooth radio-frequency (RF) tag scanning and print invoices.
- Designed and developed a Bluetooth RF tag scanning UX system and integrated it with a React Native application to track sheep while categorizing them before the auction without human interaction.
- Converted a server-rendered PHP business app to a single-page web application using React and Flux architecture.
Technologies: jQuery, CSS3, Node.js, Front-end, ECMAScript (ES6), JavaScript, CSS, Less, HTML, React Native, React, Visual Studio Code (VS Code), React Redux, Flux, HTML5, JSX, Startups, React Router, Leadership, Responsive Web Design (RWD), Front-end Development, Bluetooth, APIs, Data Visualization, Styled-components, Sass, User Interface (UI), Payment APIs, Express.js, MongoDB, Webpack, Early-stage Startups, Cross-platform, Android App Development, API Integration
Full-stack Web Developer
2012 - 2014
Sarasavi Bookshop (Pvt) Ltd
- Developed a vehicle tracking system using a Google Maps API and created a PHP service to listen to location data sent from the GPS device through HTTP.
- Designed and developed an in-house, web-based system for the eCommerce aspect of the company.
- Created a system to automate the process of uploading products to the online website from a local database (MS SQL).
- Integrated a secure payment processing gateway to an eCommerce web application.
- Designed and developed a website for the book publishing department.
Technologies: Google Maps API, Back-end, Front-end, CakePHP, Payment APIs, MySQL, PHP 5, jQuery, JavaScript, HTML, CSS, HTML5, JSX, PHP, Front-end Development, Full-stack Development, APIs, Microsoft SQL Server
Experience
April Data Managment Platform
https://www.aprilasia.com/en/A full-stack application built using React and Node.js to monitor and display paper and pulp production data collected from the PI DataLink system, which connects to industrial devices. The application integrates with the PI System to fetch real-time production data, storing it in a PostgreSQL database after performing initial calculations. Advanced data processing and additional calculations are performed on the Node.js back end to derive actionable insights from raw data. The front end features interactive data visualizations and charts using React, enabling users to intuitively understand production metrics. The application facilitates real-time tracking of production trends, identification of anomalies, and process optimization through clear and insightful visual representations.
Simulator Apps for BEKO Technologies Devices
https://www.beko-technologies.com/en-en/A web-based application that I developed using Next.js and Tailwind CSS, creating a series of simulator apps for BEKO Technologies' hardware products. As the sole developer, I collaborated with a UI/UX designer as needed to ensure the apps provided an intuitive user experience. These fully functional simulators accurately replicated all UX interactions, allowing users to experience and understand the products online before making a purchase.
School Management Mobile App
https://www.dvloop.itA React Native application on which I consulted for two months, where the app was developed using the Expo framework, providing the team with technical direction and mentorship and I re-architected the navigation system to resolve critical bugs, which significantly improved user experience and app stability. Additionally, I implemented a deployment strategy that enabled seamless releases across various app stores and environments, including alpha, beta, and production. I also guided the team in optimizing app performance by leveraging industry-leading tools and promoted best coding practices to ensure the project remained maintainable and scalable.
Amanah Saham Nasional Berhad (ASNB) Fund Investment
https://www.cimb.com.myAn Amanah Saham Nasional Berhad (ASNB) Fund Investment platform designed for a Malaysian bank seamlessly integrated into the bank’s online banking application. This platform enables account holders to purchase investment products and manage their portfolios without the need for additional apps. Users can easily invest using their existing bank accounts and also make investments on behalf of family members. The application is built with a robust and secure architecture, ensuring the safety and confidentiality of user data and financial transactions while complying with industry-standard security practices.
JetPayNow
JetPayNow enables the 1,000+ private sector customs brokers, freight forwarders, and shippers in Ghana’s shipping industry to pay terminal operators, shipping lines, airlines, and airport ground handlers from the comfort of their mobile devices and desktop computers using bank cards and mobile money.
XForce Connect
XForce Connect converts the complexity of sales into a simple, step-by-step process to help real estate agents focus on closing deals while on the go. The platform was built with React Native, React Navigation, and Easy Peasy (a Redux-based hooks library).
Platform users can perform the following tasks:
• Prioritize the leads and tasks they have on hand.
• Schedule tasks and appointments and set reminders to stay on track.
• Log calls and text clients right from the app.
• Update clients' status after each visit and record notes with ease.
• Easily filter and organize the client database.
• Display comprehensive and detailed information for each client's profile.
Platform users can perform the following tasks:
• Prioritize the leads and tasks they have on hand.
• Schedule tasks and appointments and set reminders to stay on track.
• Log calls and text clients right from the app.
• Update clients' status after each visit and record notes with ease.
• Easily filter and organize the client database.
• Display comprehensive and detailed information for each client's profile.
e Grama Niladari (eGN) Mobile App
A government application used to record details of citizens, households, institutes, geolocations, and services to help citizens use government services, such as obtaining certificates and documents. As the lead developer, I managed the team, reviewed code, and provided consultations.
Schema-based Form Generation and Validation Tool with Multilingual Support
A form generation tool that can covert JSON or YAML specifications to a React Native form. Form validation is also based on that schema file, using predefined validation rules or adding multiple regular expression (regex) patterns to validate each field.
AgriNous | React Native Android Application for an Auction Module
AgriNous is a cloud-based, offline-first mobile application, allowing stock agents to perform sale yard operations and connecting various Bluetooth RF tag scanners and printers, where the app was built with React Native, Redux, Redux-saga, and Couchbase Lite.
RUBIK | R&D on Advanced Cross-platform UI Development
React/Rapid UI building kit (RUBIK) was an R&D project (initiated in 2015) on the rapid development of API-driven, cross-platform UIs with near-native performance. It employs new technologies, libraries, and standards such as React, HTML5 offline capabilities, and ECMAScript 2015.
Skills
Libraries/APIs
React, React Router, Node.js, React Redux, Redux-Saga, Google Maps, React Navigation, Redux Form, REST APIs, D3.js, React Query, jQuery, Google Maps API, Formik, NgRx, Stripe API, RxJS
Tools
Git, GitHub, JSX, NPM, Expo, Firebase Cloud Messaging (FCM), Babel, Webpack, Expo.io, Visual Studio App Center, Nx, Jira, Figma
Languages
HTML, CSS, JavaScript, ECMAScript (ES6), TypeScript, ES7, Sass, Less, CSS3, HTML5, PHP 5, PHP, SQL, SCSS
Frameworks
React Native, Redux, Next.js, Jest, Angular, Express.js, CakePHP, Electron, Flux, JSON Web Tokens (JWT), Tailwind CSS, Material UI
Paradigms
Web Application Architecture, Unit Testing, Responsive Web Design (RWD), Cross-platform, Testing, Test-driven Development (TDD), Functional Programming, REST, Design Patterns, Microfrontends, Agile, Scrum
Platforms
Mobile, Android, iOS, Firebase, AWS Lambda, Windows, Linux, MacOS, Amazon Web Services (AWS), Visual Studio Code (VS Code)
Storage
MySQL, SQLite, PostgreSQL, Couchbase Lite, Amazon DynamoDB, Microsoft SQL Server, MySQLi, MongoDB
Other
Front-end, User Experience (UX), User Interface (UI), Code Review, Google Play Store, App Store, Front-end Development, Hybrid Apps, Mobile App Development, TanStack Query, Styled-components, Payment APIs, React Native Navigation, Architecture, Leadership, Full-stack, Full-stack Development, APIs, Data Visualization, Fintech, Android App Development, API Integration, Software Architecture, Security, General Data Protection Regulation (GDPR), UniStyle, Back-end, CodePush, Startups, Early-stage Startups, CI/CD Pipelines, Finance, SWR, React Hooks, ClickUp, Bluetooth, Monorepos, Monotrepo
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