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Parminder Singh
Verified Expert in Engineering
Front-end Developer
London, United Kingdom
Toptal member since September 13, 2022
Bio
Parminder is a skilled, award-winning front-end engineer and designer with a background in working with prestigious companies such as Amazon, Revolut, Flipkart, and Swiggy. Having a profound understanding of building large-scale web applications, he has led front-end teams, devised the UI architecture, and worked on the major front-end frameworks and libraries such as React, Angular, and Vue.js, contributing to open source. He is eager to take on new challenges when working with tech companies.
Portfolio
Mollycule Labs
Flutter, Node.js, NestJS, GraphQL, Docker, WebRTC, WebSockets, Figma...
Amazon UK
React, TypeScript, Web Accessibility, Tailwind CSS, RESTFul APIs, UI Testing...
Finder
Front-end, TypeScript 3, React, JavaScript, React Native, Appium, Redux...
Experience
- React - 11 years
- JavaScript - 8 years
- Front-end - 8 years
- TypeScript 3 - 7 years
- Redux - 7 years
- TypeScript - 6 years
- GraphQL - 3 years
- Angular - 3 years
Preferred Environment
Slack, MacOS, Vue, APIs, REST APIs, HTML, CSS
The most amazing...
...tool I've developed is a dynamic, open source React UI builder called Mason, which is being used by the developer community.
Work Experience
Founder
2025 - PRESENT
Mollycule Labs
- Developed and launched the dating app "Firefly" on the Apple App Store, Google Play Store, and the web.
- Built the app in Flutter, with features like profile and account management, OAuth login, real-time chats and push notifications, video and audio calling in WebViews using WebRTC, user blocking features, etc.
- Launched a Flutter app on the Apple App Store, Mac Store, and web for checking real-time data for UK trains from station A to B using the National Railways API with a Node.js server.
Technologies: Flutter, Node.js, NestJS, GraphQL, Docker, WebRTC, WebSockets, Figma, Web Design, HTML5, Design, UI Animation, Express.js, UI Design, Zustand, Application State Management
Front-end Engineer
2022 - 2025
Amazon UK
- Created bespoke landing pages for Amazon brand ads and EU campaigns for Adidas, Enterogermina, World of Warcraft, and Microsoft Copilot.
- Led the accessibility project for S3 and Glacier consoles in AWS.
- Planned and managed teams across Europe, Toronto, and Vancouver time zones.
Technologies: React, TypeScript, Web Accessibility, Tailwind CSS, RESTFul APIs, UI Testing, Figma, Web Design, SCSS, Web Content Accessibility Guidelines (WCAG), HTML5, UI Animation, Tailwind UI, Vite, Express.js, WCAG 2, Accessibility, Zustand, Application State Management
Senior Front-end Engineer
2021 - 2022
Finder
- Built the Android and iOS app for Finder UK using React Native, TypeScript, E2E automation Detox, Appium WebdriverIO, BrowserStack, GitHub Actions, CodePush, GraphQL, Mirage JS, and React Testing Library.
- Contributed to the internal Finder components library using NativeBase, Storybook, and Chromatic.
- Implemented the full continuous integration and continuous delivery (CI/CD) process in GitHub Actions for app quality check, versioning, and release.
- Set up the Apple Store distribution using TestFlight and Google Play using internal testing.
- Distributed a successful alpha internal release for Android and iOS.
Technologies: Front-end, TypeScript 3, React, JavaScript, React Native, Appium, Redux, Redux-Saga, GraphQL, Jest, Visual Studio App Center, GitHub Actions, Storybook, NativeBase, BrowserStack, CSS, CircleCI, RESTFul APIs, UI Testing, Figma, Web Design, SCSS, HTML5, UI Animation, Express.js, Application State Management
Front-end Engineer | UX Designer
2020 - 2021
Atomico
- Led the font-end venture capital (VC) dashboard in React, TypeScript, Redux, Nx, Jest, and Ramda. The main Crunchbase-like dashboard Bohr is used for researching companies, with the possibility of making notes and performing an advanced search.
- Created rich interactive mock designs in Framer and Figma.
- Maintained the Chrome extension to work across various platforms.
- Designed and integrated email templates on the company updates to be sent to the users using Framer and MJML.
- Improved the scroll performance of an advanced grouped user activity feed by 80%.
- Integrated the app's advanced user analytics globally in a performant way with Heap analytics.
Technologies: React, TypeScript 3, Redux, Nx, Jest, Ramda, Framer, Next.js, CSS, Payment APIs, CircleCI, Heroku, RESTFul APIs, UI Testing, Figma, Web Design, SCSS, HTML5, Design, UI Animation, Express.js, UI Design, Progressive Web Applications (PWAs), Application State Management
Senior Front-end Engineer
2020 - 2020
Revolut
- Implemented triaging of the automated transaction monitoring (TM) alerts and anti-money laundering (AML) tickets in the financial crime automation team dashboard to help increase the agents' efficiency in resolving TM and AML tickets.
- Added new features to the dashboard for financial crime automation using the test-driven development (TDD) approach.
- Contributed to the Revolut custom component library using React and styled-system.
- Implemented onboarding flow screens for Revolut Business.
Technologies: React, TypeScript, Redux, GraphQL, Test-driven Development (TDD), Jest, RTL, CSS, Heroku, RESTFul APIs, React Query, UI Testing, MobX, Web Design, SCSS, HTML5, UI Animation, Express.js, Application State Management
Lead Front-end Engineer
2019 - 2020
Swiggy
- Led the development of Anobis, a mobile progressive web app (PWA), to check Swiggy's data through visualizations and filters for various metrics at one's fingertips.
- Developed a config-driven platform for creating UI applications for the Swiggy data platform team helping business analysts.
- Managed the UI team to ship and build quality UI applications.
- Built a Node.js proxy server in Koa to fit the needs for the UI over a generalized Python back-end server.
- Introduced an advanced touch drag and release list shuffle component.
- Mentored team members to implement components and contribute to open source.
- Implemented the Docker setup for the Anobis app and shared the in-depth learning with the teams company-wide through presentations.
Technologies: React, TypeScript 3, Redux, Redux-Saga, Redux Form, Docker, PWA, Service Workers, D3.js, CSS, RESTFul APIs, UI Testing, Web Design, SCSS, HTML5, UI Animation, Express.js, Application State Management
UI Engineer
2017 - 2019
Flipkart
- Worked with the Flipkart central team to integrate a multi-lingual vernacularization experience in the desktop PWA app.
- Integrated web push notifications on the company website with user notification customization options for various channels, including email, SMS, and web.
- Created the Reporting section on the Flipkart Neo Dashboard to help the data analysis team using React, Redux, and Highcharts.
- Built the digital marketing platform for the merchandising and monetization team.
- Implemented a rich interactive mentions autocompletion input component.
Technologies: React, TypeScript 3, Styled-components, Redux, Highcharts, Jest, CSS, RESTFul APIs, UI Testing, Web Design, SCSS, HTML5, UI Animation, Express.js, Application State Management
UI Technical Architect
2016 - 2017
Tapzo (acquired by Amazon Pay India)
- Created a React app for finding the nearest working ATM during the demonetization by the Indian government.
- Worked as a lead front-end developer to add a WebView to the Offers section of the Tapzo Android app powered by React, Redux, and Webpack.
- Held continuous training sessions for the team members.
Technologies: React, Redux, WebView, CSS, Payment APIs, RESTFul APIs, Angular, Web Design, SCSS, HTML5, UI Animation, Express.js, Application State Management
UI Technical Architect
2016 - 2017
OneDirect
- Led the development of the OneDirect CRM dashboard suite in Angular 4.
- Managed a team of six front-end developers to upskill them and deliver the project on time.
- Directed the development of the OneDirect Feedback cloud project in Angular 4.
Technologies: Front-end, Angular, TypeScript 3, RxJS, Protractor, CSS, RESTFul APIs, Web Design, SCSS, HTML5, UI Animation, Express.js, Application State Management
Senior Full-stack Developer
2014 - 2016
Musejam
- Led the development of the main Musejam web app AngularJS and PHP Laravel. Created the whole architecture and custom components and directives.
- Directed the development of LookManagers, a fully responsive web eCommerce app used by fashion designer Ridhi Mehra.
- Developed the Muselook customer endpoint web app using AngularJS.
- Oversaw the development of Musejam control panel and admin panel, AngularJS web apps for Musejam internal uses.
Technologies: AngularJS, PHP, Laravel, NGINX, MySQLi, Node.js, CSS, RESTFul APIs, Angular, Web Design, SCSS, HTML5, UI Animation, Express.js, Full-stack, Application State Management
Experience
Mason
An npm package to build dynamic, eventful, cohesive config-driven UI easily. All it needs to render a complete UI is its JSON configuration and the parameters like how they'll interact and how their layout would look.
Lattice
A CSS Grid-based layout renderer based on styled-components and styled system. It helps improve the development time by declaratively specifying the common CSS values as JSX props and a grid system made easy via CSS3 grids.
Flipkart.com
Worked on the Flipkart.com notification preferences page and internal ads data platform for maintaining and running ads campaigns on the Flipkart website and other apps. I also added support for digital marketing for Facebook and Google and visualizations of the data using Highcharts, filtering and sorting, etc.
Education
2011 - 2015
Bachelor's Degree in Computer Science
Guru Tegh Bahadur Institute of Technology - New Delhi, India
Certifications
JUNE 2018 - PRESENT
Machine Learning Nanodegree
Udacity
JUNE 2017 - PRESENT
Front-end Web Developer Nanodegree
Udacity
MAY 2013 - PRESENT
Oracle Certified Professional
Oracle
DECEMBER 2012 - PRESENT
Microsoft Certified Professional
Microsoft
Skills
Libraries/APIs
React, Redux-Saga, REST APIs, Ramda, Node.js, React Query, Redux Form, D3.js, Highcharts, RxJS, Vue, MobX, WebRTC
Tools
CircleCI, Slack, Visual Studio App Center, BrowserStack, Nx, NGINX, WebView, Figma
Languages
TypeScript 3, JavaScript, TypeScript, HTML, CSS, HTML5, GraphQL, CSS3, SQL, SCSS, PHP, Java
Frameworks
Redux, Angular, Tailwind CSS, React Native, Jest, Laravel, Next.js, Express.js, Appium, Protractor, AngularJS, Flutter, NestJS
Industry Expertise
Web Design
Paradigms
HTML DOM, UI Design, Test-driven Development (TDD)
Storage
MySQLi
Platforms
MacOS, Docker, Heroku
Other
Front-end, Styled-components, Front-end Development, APIs, RESTFul APIs, UI Testing, UI Animation, Progressive Web Applications (PWAs), Application State Management, Computer Science, GitHub Actions, Storybook, NativeBase, Framer, PWA, Service Workers, Web Content Accessibility Guidelines (WCAG), Design, Tailwind UI, Vite, WCAG 2, Accessibility, Full-stack, Zustand, RTL, Conserved Domain Database (CDD), Machine Learning, Payment APIs, Web Accessibility, WebSockets
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