Harshdeep is available for hire
Hire HarshdeepHarshdeep Singh
Verified Expert in Engineering
Full-stack Developer
Vancouver, BC, Canada
Toptal member since May 10, 2022
Bio
Harshdeep, a seasoned full-stack developer with five years of MERN stack experience, excels in development phases, optimizing performance, scalability, and security. He is recognized for problem-solving, delivering high-quality web solutions, and driving business success through exceptional user experiences. He efficiently manages projects through effective communication and collaboration, exceeding client expectations.
Portfolio
The Acquisition Group
React, JavaScript, TypeScript, AWS Lambda, Node.js, Express.js, MongoDB...
Independence Financial Network, LLC
JavaScript, HTML5, CSS3, React, Email Templates, Email Marketing Automation...
Creative Strategies & Communications, Inc.
HTML, JavaScript, HTML5, React, Sketch, Figma, UI Development, Algorithms...
Experience
- JavaScript - 5 years
- React - 5 years
- Node.js - 5 years
- MongoDB - 4 years
- Express.js - 3 years
- CSS - 3 years
- React Native - 1 year
- TypeScript - 1 year
Preferred Environment
MacOS, Linux, WebStorm, Visual Studio Code (VS Code), Front-end, GitHub, NoSQL, Git, JSON REST APIs, Mobile Development
The most amazing...
...product I've worked on is the eCommerce website for Tokopedia, the top eCommerce organization in Indonesia.
Work Experience
Full-stack Developer
2024 - PRESENT
The Acquisition Group
- Contributed to the design and production deployment of a full-stack marketplace platform used by internal sales teams, supporting concurrent user activity and real-time data interactions across client–seller workflows.
- Engineered scalable React-based front-end modules and reusable component architecture, improving maintainability and reducing feature delivery time across iterative releases.
- Designed and optimized RESTful APIs using Node.js and Express, improving data retrieval efficiency and reducing dashboard load time by 20% through query tuning and API payload minimization.
- Implemented CI/CD workflows to streamline build validation and controlled production releases, ensuring stable deployments and reducing regression risks.
- Maintained website security measures to protect against cyber threats.
- Integrated logging and runtime error monitoring practices to proactively detect and resolve production issues, improving overall application reliability.
- Optimized dashboard performance, reducing load times by 20% and enhancing the overall user experience.
- Supported secure JWT-based authentication flows and role-based access control (RBAC), strengthening API security and protecting sensitive operational data.
Technologies: React, JavaScript, TypeScript, AWS Lambda, Node.js, Express.js, MongoDB, Chart.js, Amazon EC2, Agile Software Development, Cron, Back-end Development, Front-end Development, Data Visualization, Dashboards, Google Analytics, Progressive Web Applications (PWAs), Data Integration, UI Development, Browser Automation, Algorithms, Code Review, Team Mentoring, Landing Pages, WebSockets, Agile, CSV, Email Templates, HTML Email, SendGrid, Mailchimp, MUI CSS, AG Grid, Claude, Claude Code, Cursor AI, Figma to React, JSON REST APIs, Claude API, Large Language Models (LLMs), AI Integration, Data Modeling, Document Parsing, PostgreSQL, Real-time Systems, AI Tools, Legacy Code, Marketplaces, Technical Architecture, Stripe, Azure, Material UI, Source Code Review, CI/CD Pipelines, Security, Payments, AI-generated Code, Auth, Component-based Development, Vercel, Redis, JWT Authentication, Streaming Data, Event-driven Systems, Vibe Coding, Software Architecture, Code Refactoring, Refactoring, Jest, Vitest, Unit Testing, Testing, Test-driven Development (TDD), Integration Testing, E2E Testing, Performance Optimization, Performance, React Query
Full-stack Developer
2025 - 2025
Independence Financial Network, LLC
- Engineered a fully responsive HTML email and landing page system with dynamic CSV-based personalization, boosting campaign engagement for a US financial services client.
- Automated end-to-end lead flow using Zapier, integrating Mailjet, custom React landing pages, and Shape CRM to streamline outreach and data capture.
- Implemented Sanity Studio as a CMS to manage marketing content dynamically, enabling non-technical team members to update emails and landing pages efficiently.
Technologies: JavaScript, HTML5, CSS3, React, Email Templates, Email Marketing Automation, SendGrid, Zapier, CSV, API Integration, HTML Email, Customer Relationship Management (CRM), Mailjet, APIs, Mailchimp, TypeScript, Amazon EC2, Amazon S3 (AWS S3), Express.js, MongoDB, Sanity Studio, Content Management Systems (CMS), MUI CSS, JSON REST APIs, AI Integration, Data Modeling, PostgreSQL, Real-time Systems, AI Tools, Technical Architecture, Azure, Auth, Component-based Development, JWT Authentication, Event-driven Systems, Software Architecture, Code Refactoring, Refactoring, Performance Optimization, Performance, React Query
Full-stack Developer
2024 - 2025
Creative Strategies & Communications, Inc.
- Converted high-fidelity Sketch designs into pixel-perfect, fully responsive React web pages, ensuring cross-browser compatibility and optimal performance across various screen sizes.
- Integrated RESTful APIs and optimized front-end data handling, implementing efficient state management (using React Context and Redux) to enhance application responsiveness and reduce unnecessary re-renders.
- Developed and maintained reusable, modular React components with optimized styling (CSS-in-JS and Styled Components), improving scalability and reducing redundant code.
- Collaborated closely with back-end developers to debug API integration issues, optimize data fetching strategies, and enhance overall application performance, ensuring seamless user interactions.
Technologies: HTML, JavaScript, HTML5, React, Sketch, Figma, UI Development, Algorithms, Code Review, Figma to HTML, Landing Pages, Agile, CSV, Email Templates, HTML Email, SendGrid, Mailchimp, MUI CSS, JSON REST APIs, Data Modeling, Real-time Systems, Technical Architecture, Component-based Development, JWT Authentication, Event-driven Systems, Software Architecture, Code Refactoring, Refactoring, Performance Optimization, Performance
Front-end JavaScript Developer
2024 - 2024
Get2it, Inc.
- Converted high-fidelity Sketch designs into pixel-perfect, fully responsive React web pages, ensuring cross-browser compatibility and optimal performance across various screen sizes.
- Integrated RESTful APIs and optimized front-end data handling, implementing efficient state management (using React Context and Redux) to enhance application responsiveness and reduce unnecessary re-renders.
- Developed and maintained reusable, modular React components with optimized styling (CSS-in-JS and Styled Components), improving scalability and reducing redundant code.
- Collaborated closely with back-end developers to debug API integration issues, optimize data fetching strategies, and enhance overall application performance, ensuring seamless user interactions.
Technologies: CSS, HTML5, JavaScript, React, Sketch, Figma, UI Development, Algorithms, Code Review, Figma to HTML, Landing Pages, Agile, CSV, MUI CSS, JSON REST APIs, Data Modeling, Real-time Systems, Technical Architecture, Component-based Development, JWT Authentication, Event-driven Systems, Software Architecture, Code Refactoring, Refactoring, Performance Optimization, Performance
Full-stack Engineer
2023 - 2023
Grown Unknown, LLC
- Integrated OpenAI API for user content creation, to enhance astrology content creation within the platform, contributing to a more engaging user experience.
- Led the development of eCommerce solutions for clients, incorporating CRM management through Shopify to streamline business operations and enhance customer interactions.
- Orchestrated email campaign automation using Klaviyo, resulting in improved communication strategies for both new and existing users.
- Engineered intricate multi-layered relationships among platform users, implementing a Family-like relations system to foster stronger user connections.
- Spearheaded the end-to-end development of a comprehensive platform, drawing inspiration from Figma for design and utilizing Express and MongoDB on the back end for robust business logic implementation and efficient database management.
Technologies: React, Node.js, APIs, MongoDB, Amazon Web Services (AWS), Amazon EC2, OpenAI GPT-4 API, Amazon S3 (AWS S3), Shopify, Bootstrap, Sass, ECMAScript (ES6), Back-end Development, CSS3, JSON/XML Schemas, OpenAI, NPM, Webpack, Data Visualization, D3.js, OAuth, OAuth 2, ChatGPT, ChatGPT API, Dashboards, Highcharts, DevOps, Artificial Intelligence (AI), WebApp, OpenAI API, Squarespace, UI Development, Algorithms, Code Review, Landing Pages, Agile, CSV, Email Templates, HTML Email, SendGrid, Mailchimp, MUI CSS, JSON REST APIs, Data Modeling, Technical Architecture, Twilio, Component-based Development, JWT Authentication, Event-driven Systems, Software Architecture, Code Refactoring, Refactoring, Performance Optimization, Performance
React Developer
2023 - 2023
WorkRamp, Inc.
- Enhanced product accessibility by implementing Accessible Rich Internet Applications (ARIA) rules, ensuring compliance with accessibility standards, and improving user experience.
- Significantly improved the accessibility score of the product, elevating it from approximately 30% to an impressive 95%, demonstrating a commitment to inclusivity and user-friendly design.
- Optimized some systems in the product to be more organized and be more reusable all across.
- Implemented optimization strategies for various systems within the product, resulting in increased organization and reusability across the project, streamlining development processes and promoting efficiency.
Technologies: JavaScript, Web Accessibility, React, TypeScript, Learning Management Systems (LMS), HTML, Web Development, Auth0, NoSQL, Git, Design, Web Design, Websites, UX Design, Front-end Architecture, Web, Material UI, Bootstrap, Sass, ECMAScript (ES6), Back-end Development, CSS3, JSON/XML Schemas, NPM, Webpack, Data Visualization, OAuth, OAuth 2, ChatGPT, ChatGPT API, DevOps, WebApp, Google Analytics, UI Development, Algorithms, Code Review, Landing Pages, Agile, CSV, MUI CSS, JSON REST APIs, Data Modeling, Real-time Systems, Technical Architecture, Component-based Development, JWT Authentication, Event-driven Systems, Software Architecture, Code Refactoring, Refactoring, Performance Optimization, Performance
Senior Full-stack Developer | React and Node.js
2022 - 2022
Aqueous Asset Inc.
- Pioneered the development of a novel system for creating offering memorandums tailored specifically for US properties, introducing a comprehensive and efficient solution to address specific business needs.
- Expanded the functionality of the existing system through strategic abstraction, enhancing its capabilities and ensuring scalability to meet evolving business requirements.
- Spearheaded a code revamp initiative, significantly improving code reusability and readability, resulting in a more maintainable and streamlined codebase for enhanced collaboration and future development efforts.
Technologies: React, APIs, Node.js, MongoDB, JavaScript, PDF, Puppeteer, Minimum Viable Product (MVP), Full-stack, Front-end, Figma, Animation, GitHub, Startups, REST APIs, API Development, Full-stack Development, Third-party APIs, Team Leadership, JSON Web Tokens (JWT), React Redux, JSON, API Integration, Back-end, Front-end Development, Web Development, Google Analytics 4 (GA4), Auth0, NoSQL, Git, Design, Web Design, Websites, UX Design, Front-end Architecture, Web, Leadership, Material UI, Bootstrap, Sass, ECMAScript (ES6), Back-end Development, CSS3, JSON/XML Schemas, NPM, Webpack, Data Visualization, D3.js, OAuth, OAuth 2, ChatGPT, ChatGPT API, Dashboards, Highcharts, DevOps, WebApp, Data Integration, UI Development, Browser Automation, Algorithms, Code Review, Landing Pages, Agile, CSV, MUI CSS, JSON REST APIs, Data Modeling, Real-time Systems, Technical Architecture, Component-based Development, JWT Authentication, Event-driven Systems, Software Architecture, Code Refactoring, Refactoring, Legacy Code, Performance Optimization, Performance
Software Engineer
2021 - 2021
Tokopedia
- Charged with maintaining the front-end design part in React for multiple eCommerce platform services.
- Achieved a 30% increase in test case coverage, 50% in statement coverage, and 40% in branch coverage for existing components, enhancing application reliability.
- Directed the hiring process, conducting 30+ interviews to attract high-caliber professionals and uphold organizational standards.
- Mentored new team members, facilitating a smooth transition from academia to industry and contributing to their professional development.
Technologies: React, Express.js, JavaScript, TypeScript, HTML5, CSS, APIs, Redux, SCSS, REST APIs, HTML, MySQL, Responsive Web Design (RWD), Web UI Design, User Interface (UI), User Experience (UX), React Router, UI Design, MERN Stack, REST, Full-stack, Front-end, Figma, Animation, GitHub, Startups, eCommerce, API Development, Full-stack Development, Third-party APIs, JSON Web Tokens (JWT), React Redux, JSON, API Integration, Back-end, Front-end Development, Web Development, Google Analytics 4 (GA4), Auth0, NoSQL, Git, CI/CD Pipelines, Design, Web Design, Websites, UX Design, Mobile First, Google+ Authentication, Web App UX, Front-end Architecture, Web, Leadership, PWA, Mobile Video, Material UI, Bootstrap, Sass, ECMAScript (ES6), Back-end Development, JSON/XML Schemas, NPM, Webpack, Data Visualization, D3.js, OAuth, OAuth 2, Dashboards, Highcharts, Docker, WebApp, Progressive Web Applications (PWAs), Data Integration, UI Development, Browser Automation, Algorithms, Code Review, Team Mentoring, Landing Pages, WebSockets, Agile, CSV, MUI CSS, JSON REST APIs, Microfrontends, Data Modeling, Real-time Systems, Technical Architecture, Component-based Development, JWT Authentication, Event-driven Systems, Software Architecture, Code Refactoring, Refactoring, Vitest, Unit Testing, Testing, Test-driven Development (TDD), Integration Testing, E2E Testing, Performance Optimization, Performance
Software Engineer
2019 - 2021
TO THE NEW Pvt. Ltd.
- Adhered to best practices and coding standards to develop high-quality software solutions using programming languages.
- Designed, developed, and deployed software to meet business needs.
- Outlined specifications and performance requirements, working with the quality assurance team to thoroughly test all variables.
- Built responsive and user-friendly interfaces, integrated APIs, and implemented server-side functionalities to deliver robust web applications.
- Mentored junior developers on query tuning and best practices to maximize database performance.
Technologies: JavaScript, Node.js, Express.js, React, MongoDB, SQL, HTML5, CSS, APIs, Redux, SCSS, REST APIs, HTML, Responsive Web Design (RWD), Web UI Design, User Interface (UI), User Experience (UX), React Router, UI Design, MERN Stack, REST, Full-stack, Front-end, Figma, Animation, API Documentation, GitHub, Startups, API Development, Full-stack Development, Third-party APIs, Team Leadership, JSON Web Tokens (JWT), React Redux, JSON, API Integration, Webhooks, Back-end, Front-end Development, Styled-components, Web Development, Socket.IO, Auth0, NoSQL, Git, Design, Web Design, Websites, UX Design, Mobile First, Google+ Authentication, Web App UX, Front-end Architecture, Web, Leadership, PWA, Mobile Video, Material UI, Bootstrap, Sass, Vue, ECMAScript (ES6), Back-end Development, JSON/XML Schemas, NPM, Webpack, Data Visualization, D3.js, OAuth, OAuth 2, Docker, WebApp, Progressive Web Applications (PWAs), Data Integration, UI Development, Browser Automation, Algorithms, Code Review, Team Mentoring, Landing Pages, WebSockets, Agile, JSON REST APIs, Data Modeling, Real-time Systems, Technical Architecture, Component-based Development, JWT Authentication, Event-driven Systems, Software Architecture, Code Refactoring, Refactoring, Vitest, Unit Testing, Testing, Test-driven Development (TDD), Integration Testing, E2E Testing, Performance Optimization, Performance
Experience
Career Canvas
Career Canvas is a dynamic web application transforming career management. It integrates a sophisticated resume builder, an intuitive job search tool powered by LinkedIn, and an innovative cover letter generator (beta) utilizing OpenAI APIs.
Users craft tailored resumes with ease, choose from various templates, and access real-time job listings. The platform's MERN stack foundation ensures scalability and reliability, while future plans aim to enhance features and expand resources for interview prep and career guidance. Career Canvas empowers users to navigate their professional journeys effectively, positioning it as an indispensable tool for career success.
Users craft tailored resumes with ease, choose from various templates, and access real-time job listings. The platform's MERN stack foundation ensures scalability and reliability, while future plans aim to enhance features and expand resources for interview prep and career guidance. Career Canvas empowers users to navigate their professional journeys effectively, positioning it as an indispensable tool for career success.
Unconventional Player
This is an unconventional music player that uses mouse clicks and gestures to control music. One click anywhere on the screen will play or pause the music, and a long click will seek back the music given a number of seconds.
This was developed on the MERN stack using Cloudinary as a shared cloud space to store audio files.
USE CASES
• Musicians who are learning to play instruments can benefit from this using a footpad as a mouse.
• With some modifications, it could be useful for a better accessibility music player
This was developed on the MERN stack using Cloudinary as a shared cloud space to store audio files.
USE CASES
• Musicians who are learning to play instruments can benefit from this using a footpad as a mouse.
• With some modifications, it could be useful for a better accessibility music player
Suite of Apps for a Photography Gallery Webpage
A MERN stack-based solution I've worked on as a hobby. I love photography and videography and wanted an elegant solution to manage various social media accounts and my gallery website.
I created a React webpage to display all the images stored in Cloudinary using Express.js in the back end. To complement the webpage, I built a React Native app for the administrative side of the solution. Using the app, I uploaded media to Cloudinary via the Express.js back end, enabling the uploaded media to be automatically displayed on all social media accounts and my client webpage.
I created a React webpage to display all the images stored in Cloudinary using Express.js in the back end. To complement the webpage, I built a React Native app for the administrative side of the solution. Using the app, I uploaded media to Cloudinary via the Express.js back end, enabling the uploaded media to be automatically displayed on all social media accounts and my client webpage.
StockFlow AI - Automated Media Submission and Upload Pipeline
https://github.com/harshdeepsingh13/stockflow-ai• Architected and developed an end-to-end AI automation pipeline that transforms raw media assets into fully validated, platform-ready submissions by orchestrating LLM-based metadata generation, vision analysis, tag enrichment, and automated uploads.
• Designed a modular, platform-agnostic service architecture (factory and abstraction layers) enabling seamless extension to multiple marketplaces (Shutterstock, Getty, and Adobe Stock), significantly improving scalability and long-term maintainability.
• Integrated local LLM and vision models (Ollama and LLaMA) to generate high-quality titles, descriptions, and tags, reducing external API dependency and optimizing operational cost while maintaining deterministic, production-ready outputs.
• Built resilient browser automation workflows using Playwright CDP, including state detection, anti-bot timing strategies, retry logic, and failure handling to ensure reliable execution against dynamic third-party platforms.
• Engineered a fault-tolerant pipeline with validation, retry mechanisms, and structured logging (JSON and CSV), enabling traceability, bulk operations, and consistent compliance with platform-specific submission constraints.
• Designed a modular, platform-agnostic service architecture (factory and abstraction layers) enabling seamless extension to multiple marketplaces (Shutterstock, Getty, and Adobe Stock), significantly improving scalability and long-term maintainability.
• Integrated local LLM and vision models (Ollama and LLaMA) to generate high-quality titles, descriptions, and tags, reducing external API dependency and optimizing operational cost while maintaining deterministic, production-ready outputs.
• Built resilient browser automation workflows using Playwright CDP, including state detection, anti-bot timing strategies, retry logic, and failure handling to ensure reliable execution against dynamic third-party platforms.
• Engineered a fault-tolerant pipeline with validation, retry mechanisms, and structured logging (JSON and CSV), enabling traceability, bulk operations, and consistent compliance with platform-specific submission constraints.
Education
2022 - 2024
Post-Baccalaureate Diploma in Data Analytics
Douglas College - New Westminster, BC, Canada
2015 - 2019
Bachelor of Technology Degree in Computer Science
Guru Gobind Singh Indraprastha University - Delhi, India
Skills
Libraries/APIs
React, Node.js, REST APIs, React Router, React Redux, D3.js, Puppeteer, API Development, Socket.IO, Highcharts, AG Grid, Stripe, Auth, Mapbox API, Vue, Chart.js, OpenAI API, Claude API, Playwright, React Query
Tools
Figma, GitHub, Git, Auth0, NPM, Webpack, Google Analytics, Figma to HTML, SendGrid, Zapier, Claude, Claude Code, Vitest, Microsoft Power BI, ChatGPT, Sketch, Cron, Mailchimp
Languages
JavaScript, CSS, HTML, Sass, ECMAScript (ES6), SQL, TypeScript, HTML5, SCSS, CSS3, GraphQL, C#, Python
Frameworks
Express.js, JSON Web Tokens (JWT), Bootstrap, OAuth 2, WebApp, MUI CSS, React Native, Redux, Material UI, Next.js, Jest, Tailwind CSS
Paradigms
Agile, UX Design, Component-based Development, Code Refactoring, Refactoring, Agile Software Development, Responsive Web Design (RWD), UI Design, REST, DevOps, Microfrontends, Real-time Systems, Unit Testing, Testing, Test-driven Development (TDD), E2E Testing, Web UI Design, Mobile Development
Platforms
Web, Amazon Web Services (AWS), Vercel, Heroku, Amazon EC2, Shopify, Android, iOS, AWS IoT, Docker, AWS Lambda, Sanity Studio, Twilio, Azure, Ollama
Storage
MongoDB, JSON, JSON/XML Schemas, MySQL, NoSQL, Redis, Amazon S3 (AWS S3), Data Integration, PostgreSQL
Industry Expertise
Web Design, Social Media
Other
Web Development, APIs, Back-end Development, Front-end, Front-end Development, Full-stack Development, Back-end, Web Accessibility, Design, Websites, Mobile First, PWA, OAuth, UI Development, CSV, JSON REST APIs, Technical Hiring, User Interface (UI), User Experience (UX), MERN Stack, Full-stack, Animation, Startups, Third-party APIs, API Integration, Styled-components, Google Analytics 4 (GA4), CI/CD Pipelines, Google+ Authentication, Front-end Architecture, Leadership, Mobile Video, OpenAI, Data Visualization, ChatGPT API, Dashboards, Squarespace, Progressive Web Applications (PWAs), Browser Automation, Algorithms, Code Review, Team Mentoring, Landing Pages, WebSockets, Email Templates, HTML Email, Figma to React, Large Language Models (LLMs), Data Modeling, AI Tools, Legacy Code, Technical Architecture, Security, Payments, AI-generated Code, JWT Authentication, Streaming Data, Event-driven Systems, Vibe Coding, Software Architecture, Integration Testing, Performance Optimization, Performance, Cloudinary, Software Deployment, PDF, Minimum Viable Product (MVP), API Documentation, eCommerce, Team Leadership, Webhooks, Learning Management Systems (LMS), Web App UX, OpenAI GPT-4 API, Data Scraping, Software Development, RESTful Web Services, Web Scraping, Artificial Intelligence (AI), Chakra UI, Email Marketing Automation, Customer Relationship Management (CRM), Mailjet, Content Management Systems (CMS), Cursor AI, AI Integration, Document Parsing, Mobile App Development, Mobile Apps, Payment Gateways, Payment APIs, Marketplaces, Source Code Review, Vision models, Prompt Engineering, LangChain, AI Automation
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