Maisam is available for hire

Maisam Shah

Verified Expert in Engineering

Full-stack Developer

Lahore, Punjab, Pakistan

Toptal member since July 6, 2022

Expertise

Full-stack Front-end MERN Stack Payment Processing Web Development Back-end Developers App Store Development System Security Apple Pay Development Data Scraping RAG LLM

Bio

Maisam is a results-driven software engineer with more than eight years of experience in commercial application development. He brings over six years of expertise in front-end React Native development and more than five years in back-end development. Passionate about creating simple, efficient solutions to complex problems, Maisam excels in both analytical thinking and problem-solving. He consistently demonstrates the ability to see projects through from concept to completion.

Portfolio

Sidhom IT Consulting Ltd

React Native, JavaScript, TypeScript, Firebase, OpenAI, OpenAI GPT-3 API...

Reward Gateway, Limited

React Native, Android, iOS, React, TypeScript, Swift, Java, DigitalOcean, HTTPS...

An Online Freelance Agency

JavaScript 6, React Native, React, Node.js, Localization, Mobile, Next.js...

Experience

Full-stack Development - 7 years
Web UI - 5 years
TypeScript - 5 years
React - 5 years
JavaScript - 5 years
React Native - 5 years
Back-end - 4 years
Node.js - 4 years

Availability

Part-time

Preferred Environment

Windows, MacOS, Slack, Skype

The most amazing...

...thing I've worked on is developing an online marketplace application for e-vouchers from top retailers around the world with over 500,000 active users.

Work Experience

React Native Developer

2024 - PRESENT

Sidhom IT Consulting Ltd

Developed and deployed a React Native-based event management app for over 10,000 users, overseeing end-to-end development, testing, and production launch.
Implemented a retrieval-augmented generation (RAG) service using OpenAI’s language model to process and clean user data, delivering enhanced, personalized assistance for task and event management through stored vector representations.
Improved payment flow by integrating RevenueCat and expanding payment options, increasing accessibility and revenue potential for the app.
Deployed the app on both Google Play and iOS App Stores, managing the approval process and ensuring compliance with platform standards.
Resolved complex UI bugs and optimized user experience, resulting in a smoother, more intuitive app interface that increased user engagement and satisfaction.
Designed and integrated a real-time data handling and API workflow to support seamless task and event management, providing users with reliable and immediate access to essential app functions.
Provided ongoing support and enhancements to ensure the app remains high-performing and up-to-date with the latest features and platform requirements.

Technologies: React Native, JavaScript, TypeScript, Firebase, OpenAI, OpenAI GPT-3 API, RevenueCat, Google Pay, App Store, UI Components, Atomic Design, Headless UI, Minimum Viable Product (MVP), Text to Speech (TTS), Prototyping, Retrieval-augmented Generation (RAG), Large Language Models (LLMs), React Components, React Redux, Chatbots, Firebase Cloud Messaging (FCM), AI Tools, Responsive Web Apps

Senior Mobile Engineer

2022 - 2024

Reward Gateway, Limited

Led the development of a hybrid mobile application that increased user engagement by 20% through the implementation of redeemable vouchers, leveraging React Native and GraphQL for optimal performance.
Improved user retention by 15% by using Google Analytics to track and optimize user journeys, identifying key areas for enhancement to boost user loyalty and engagement.
Enhanced app performance by nearly 40% through the implementation of GraphQL for efficient data management and caching, significantly reducing load times and increasing responsiveness.
Increased successful transactions by 25% by developing and optimizing in-app checkout flows, resulting in a more reliable and satisfying user experience.
Integrated Apple Pay and Google Pay using Checkout.com, expanding secure and convenient payment options and significantly enhancing the user experience.
Implemented PCI DSS-compliant checkout flows with Checkout.com, ensuring full protection of sensitive cardholder data and maintaining rigorous security standards.
Attended yearly PCI compliance meetings to stay updated on industry standards and best practices, ensuring all systems and processes adhered to the latest regulations.
Assisted in publishing apps to Google Play and Apple App Stores, ensuring seamless deployment and compliance with platform-specific requirements.
Supported a user base of over 500,000 through continuous optimizations and new feature additions, contributing to sustained growth and high user satisfaction.

Technologies: React Native, Android, iOS, React, TypeScript, Swift, Java, DigitalOcean, HTTPS, MERN Stack, Firebase, API Integration, Data Visualization, Stripe, App Store, Google Play Store, React Query, Subscriptions, Apple Subscriptions, Communication, Testing, Design Systems, Styled-components, Mobile Apps, Architecture, Currency Exchange, DevOps, Storybook, Redux Toolkit, Front-end Architecture, Microfrontends, Full-stack, Google Cloud Functions, In-app Purchases, Mobile Architecture, Chrome Extensions, Git, Payment Gateways, NoSQL, Axios, JSON REST APIs, SOAP APIs, Wireframing, Mobile Applications, Jira, Material Design, CI/CD Pipelines, Deployment, SCSS, Version Control, Auth0, NPM, OAuth, Social Networks, Social Networks Development, App UI, Authorization, Payment Processing, Leadership, UI Animation, Databases, Apollo, React Native Reanimated, Mobile App Development, Swagger, Stripe Checkout, Stripe API, Checkout, Payment APIs, Caching, Lazy Loading, Social Media, Docker Compose, UI Components, Atomic Design, Headless UI, Minimum Viable Product (MVP), Prototyping, React Components, React Redux, Firebase Cloud Messaging (FCM), Responsive Web Apps

Full-stack Web and Mobile Application Developer

2021 - 2022

An Online Freelance Agency

Developed custom solutions for Apple Pay and Google Pay integration using Node.js, tailoring the functionality to meet specific business needs.
Gained a deep understanding of PCI compliance requirements and seamlessly integrated Stripe into various platforms, ensuring secure and compliant payment processing.
Worked on a blockchain-backed mobile application. Handled transactions between fiat and cryptocurrency. Implemented Figma designs with great accuracy.
Implemented PayPal integration for a cutting-edge crypto finance application, enabling secure and efficient transactions for users.
Worked on mobile applications for the maintenance of a factory machine. Familiarized myself with the client's code quickly and provided efficient and fast output and results.
Managed and worked on three projects for the client simultaneously. Implemented feature updates and resolved bugs while understanding the immense code bases of multiple projects.

Technologies: JavaScript 6, React Native, React, Node.js, Localization, Mobile, Next.js, Tailwind CSS, Figma, Jest, Webpack, PostgreSQL, Android, iOS, REST APIs, Agile, HTML, CSS, UI Design, UX Design, Design, GraphQL, Firebase Cloud Functions, Full-stack, Front-end Development, Shopify, Shopify API, User Experience (UX), Software Architecture, User Interface (UI), Google Maps, Google Places SDK, Expo, Push Notifications, Location Tracking, SQL, ChatGPT, Generative Pre-trained Transformers (GPT), Twilio, Heroku, Mobile Development, Amazon Web Services (AWS), MySQL, GitHub, DigitalOcean, HTTPS, MERN Stack, Firebase, API Integration, Data Visualization, Stripe, App Store, Google Play Store, Subscriptions, Apple Subscriptions, RevenueCat, Stripe Subscriptions, OpenAI, Communication, Testing, Design Systems, Express.js, Google Cloud, Google Cloud Platform (GCP), Sequelize, Styled-components, Mobile Apps, Architecture, Currency Exchange, OpenAI GPT-3 API, OpenAI GPT-4 API, eCommerce, Stripe API, Back-end, Cloud Infrastructure, DevOps, Startups, D3.js, Material UI, Redux Toolkit, Front-end Architecture, Microfrontends, Svelte, SvelteKit, Firebase Authentication, Cloud Firestore, Expo.io, Google Cloud Functions, In-app Purchases, Mobile Architecture, Tailwind UI, Git, Payment Gateways, NoSQL, Axios, Artificial Intelligence (AI), Image Processing, Machine Learning, AWS Lambda, JSON REST APIs, SOAP APIs, Wireframing, FastAPI, Mobile Applications, Amazon Cognito, Jira, Material Design, Animation, Mobile First, Amazon S3 (AWS S3), CI/CD Pipelines, Deployment, SCSS, Vercel, Version Control, Database Management, PayPal, Auth0, ChatGPT API, Cross-browser Compatibility, NPM, Responsive Web Design (RWD), Web3, OAuth, Social Networks, Social Networks Development, App UI, Authorization, API Development, Webhooks, Payment Processing, Cryptocurrency, Back-end Development, MongoDB Atlas, Leadership, Blockchain, Crypto, UI Animation, Microsoft SQL Server, Databases, Apollo, Prisma, React Native Reanimated, Mobile App Development, Supabase, Amazon DynamoDB, Swagger, Bootstrap, Stripe Checkout, Checkout, Payment APIs, Caching, Lazy Loading, Social Media, SQLAlchemy, Redis, Docker Compose, OpenAI API, UI Components, Atomic Design, Headless UI, Web Components, SendGrid, Minimum Viable Product (MVP), Broadcasting, Streaming, Text to Speech (TTS), Prototyping, SDKs, Data Scraping, Retrieval-augmented Generation (RAG), Large Language Models (LLMs), React Components, Django, React Redux, Chatbots, Web Development, Agora, Firebase Cloud Messaging (FCM), AI Tools, Responsive Web Apps

Senior Software Engineer

2021 - 2022

Tkxel

Optimized existing React codebases to reduce load times and enhance user experience.
Handled the customization of clients' systems, including functional requirements documentation, use cases, actual coding, and unit testing.
Identified issues, analyzed information, and provided solutions to problems.
Supervised the work of contracted employees to stay on task for timely completion.

Technologies: JavaScript, React, Node.js, Web, Web UI, Tailwind CSS, Figma, AWS Amplify, Webpack, PostgreSQL, REST APIs, Agile, GraphQL, HTML, CSS, jQuery, Software Architecture, User Interface (UI), Push Notifications, Location Tracking, SQL, Heroku, Mobile Development, MySQL, GitHub, DigitalOcean, HTTPS, MERN Stack, Firebase, API Integration, Data Visualization, App Store, Google Play Store, React Query, Communication, Design Systems, Styled-components, Mobile Apps, Architecture, Cloud Infrastructure, DevOps, Material UI, Redux Toolkit, Front-end Architecture, Full-stack, Firebase Authentication, Cloud Firestore, Google Cloud Functions, Next.js, Mobile Architecture, Git, Payment Gateways, NoSQL, Axios, JSON REST APIs, SOAP APIs, Jira, Material Design, Mobile First, Amazon S3 (AWS S3), Deployment, SCSS, Version Control, Auth0, Cross-browser Compatibility, NPM, Responsive Web Design (RWD), OAuth, Social Networks Development, App UI, Authorization, Back-end Development, Leadership, UI Animation, Microsoft SQL Server, Databases, Mobile App Development, Swagger, Bootstrap, Checkout, Payment APIs, Caching, Lazy Loading, Social Media, SQLAlchemy, Docker Compose, Django, UI Components, Atomic Design, Headless UI, Web Components, SendGrid, Minimum Viable Product (MVP), Prototyping, React Components, React Redux, Web Development, Firebase Cloud Messaging (FCM)

Senior Technical Content Engineer

2019 - 2021

Educative

Led multiple teams of engineers to attain the desired goal within the expected time frame.
Worked closely with the technical team, product managers, and CEO to strategize and plan new courses and their impact on the development of society.
Interviewed and mentored employees and new engineers on the team.

Technologies: JavaScript, Python 3, Docker, Web, React, jQuery, Search Engine Optimization (SEO), User Interface (UI), Push Notifications, Location Tracking, SQL, Heroku, Python, MySQL, GitHub, HTTPS, MERN Stack, Firebase, API Integration, Data Visualization, Communication, Design Systems, Architecture, Mobile Architecture, Git, NoSQL, JSON REST APIs, SOAP APIs, Jira, Deployment, Version Control, Leadership, UI Animation, Databases, Payment APIs, Caching, Lazy Loading, Social Media, Docker Compose, Minimum Viable Product (MVP), Prototyping, Web Development

Software Developer

2017 - 2019

An online freelance agency

Worked on three cross-platform mobile applications using React Native + Redux with Material UI.
Developed an app that utilizes an Uber-like functionality to connect to users with live tracking. This was achieved through the APIs provided by Google.
Worked on both WebRTC and Twilio to enable in-app audio/video calling for multiple applications.
Used Firebase functions to enable push notifications and automatic data updates.
Worked with Redux for global state management and Redux Thunk to handle asynchronous calls as middleware.
Gained a deep understanding and working experience in object-oriented JavaScript programming and the MVVM design pattern.

Technologies: Python 3, Selenium, Jupyter Notebook, Pandas, TensorFlow, React, JavaScript, TypeScript, C++, Java, Localization, Mobile, Figma, Webpack, PostgreSQL, REST APIs, Agile, HTML, CSS, UI Design, UX Design, Design, GraphQL, Firebase Cloud Functions, Full-stack, Front-end Development, User Experience (UX), Software Architecture, User Interface (UI), Google Maps, Google Places SDK, Expo, Push Notifications, Location Tracking, SQL, Twilio, Heroku, Python, Mobile Development, Amazon Web Services (AWS), MySQL, Maps, GitHub, HTTPS, MERN Stack, Firebase, API Integration, Data Visualization, Stripe, App Store, Google Play Store, React Query, Subscriptions, Apple Subscriptions, Stripe Subscriptions, Communication, Testing, Design Systems, Express.js, Google Cloud, Google Cloud Platform (GCP), Sequelize, Styled-components, Mobile Apps, Architecture, Currency Exchange, OpenAI GPT-3 API, OpenAI GPT-4 API, eCommerce, Stripe API, Back-end, Cloud Infrastructure, DevOps, Startups, Material UI, Redux Toolkit, Front-end Architecture, Microfrontends, Firebase Authentication, Cloud Firestore, Expo.io, Google Cloud Functions, In-app Purchases, Next.js, Mobile Architecture, Tailwind UI, Git, Payment Gateways, NoSQL, Axios, Artificial Intelligence (AI), Image Processing, Machine Learning, AWS Lambda, JSON REST APIs, SOAP APIs, Wireframing, FastAPI, Mobile Applications, Amazon Cognito, Jira, Material Design, Animation, Mobile First, Amazon S3 (AWS S3), CI/CD Pipelines, Deployment, SCSS, Vercel, Version Control, Database Management, PayPal, Auth0, Cross-browser Compatibility, NPM, Responsive Web Design (RWD), OAuth, App UI, Authorization, API Development, Webhooks, Payment Processing, Back-end Development, Microsoft SQL Server, Databases, Apollo, Prisma, React Native Reanimated, Mobile App Development, Supabase, Amazon DynamoDB, Swagger, Bootstrap, Stripe Checkout, Checkout, Payment APIs, Caching, Lazy Loading, Social Media, SQLAlchemy, Docker Compose, OpenAI API, UI Components, Atomic Design, Headless UI, Web Components, SendGrid, Minimum Viable Product (MVP), Broadcasting, Streaming, Text to Speech (TTS), Prototyping, SDKs, Data Scraping, Dating Apps, React Components, Django, React Redux, Web Development, Agora, Firebase Cloud Messaging (FCM), AI Tools, Responsive Web Apps

Experience

Ezyorganizer

https://apps.apple.com/us/app/ezyorganizer-life-organizer/id1469144912?ls=1

As the full-stack and sole developer, I led the end-to-end development, testing, and deployment of a React Native-based event management app serving over 10,000 users. I also implemented a retrieval-augmented generation (RAG) service using OpenAI's language model. This service processes and cleans user data, runs it through an RAG pipeline, and stores vector representations in a database. These vectors enhance the model's ability to assist users effectively with task and event management, offering a more personalized and intelligent experience.

SmartSpending

https://play.google.com/store/apps/details?id=com.rewardgateway.mob_04&hl=en

A React Native-based online marketplace for e-vouchers from top global retailers, where I led the front-end development, testing, and deployment. I implemented smooth, PCI DSS-compliant checkout flows using Checkout.com, ensuring rigorous protection of sensitive cardholder data. Leveraging GraphQL, I optimized data management and caching, which enhanced app performance by nearly 40%, improving load times and responsiveness. By integrating Apple Pay and Google Pay through Checkout.com, I provided users with secure, convenient payment options, elevating the overall user experience. This application was successfully published on both Google and Apple App Stores, achieving high quality, security, and user engagement standards.

Edenred Discounts

https://play.google.com/store/apps/details?id=com.rewardgateway.mob_04_edenred&hl=en

Preventa

https://apps.apple.com/us/app/preventa/id6738446208

I developed the MVP for Preventa, a React Native app, in one month, managing both the front end and back end. The app integrates with Apple HealthKit to fetch and store user health data on the server. It features an LLM-powered chatbot that provides personalized insights and allows users to interact with their data. I also implemented functionality to detect certain heart conditions, promoting early diagnosis and proactive management. This solution lets users use their health metrics in real time, improving health awareness and monitoring.

CoSafe

https://play.google.com/store/apps/details?id=com.cocrisis.live&hl=en&gl=US

CoSafe is a powerful and user-friendly critical communication platform for alerting, managing and preventing incidents.

Designed by crisis management experts and customized for building safe, resilient, and sustainable organizations. The platform helps organizations keep employees safe and informed by ensuring that the right information reaches the right person at the right time. I was the front-end developer in charge of designing interactive UI screens. I also managed the API integration to organize and display complex, real-time data to the users.

Finay

http://apps.apple.com/pk/app/finay/id1613395121

Finay is the virtual home the music community deserves, supporting artists and directly connecting them with their fans.

As the full-stack developer, I led the development, testing, and deployment of this application. Also, I successfully implemented PayPal integration, enabling users to make secure and efficient transactions. This mobile app was published on the App Store. Additionally, I managed and oversaw the tasks of the blockchain developer and ensured timely delivery to the client.

Smart Factory

https://apps.apple.com/pk/app/smart-factory/id1510565698

Smart factory helps people see the productivity of machines and manage them accordingly. I was part of the front-end development team for the app. I built the user interface and integrated APIs to interact with the back end.

Education

2015 - 2019

Bachelor's Degree in Computer Science

National University of Computer and Emerging Sciences - Lahore, Pakistan

Certifications

MARCH 2024 - PRESENT

Application Security – The Complete Guide

Udemy

DECEMBER 2020 - PRESENT

Learn HTML, CSS, and JavaScript from Scratch

Educative

Skills

Libraries/APIs

React, Node.js, React Navigation, REST APIs, Google Maps, Stripe, React Query, Apple Subscriptions, Stripe API, SOAP APIs, API Development, SQLAlchemy, OpenAI API, React Redux, WebRTC, jQuery, Pandas, TensorFlow, AWS Amplify, MobX, Shopify API, D3.js, HealthKit

Tools

Slack, Skype, Figma, Xcode, Android Studio, Google Places SDK, Expo, ChatGPT, GitHub, Redux Toolkit, Firebase Authentication, Expo.io, Git, Amazon Cognito, Jira, Auth0, NPM, MongoDB Atlas, Stripe Checkout, SendGrid, Agora, Firebase Cloud Messaging (FCM), Webpack, Sequelize, Prisma, Docker Compose

Languages

JavaScript, TypeScript, HTML, CSS, SQL, Python, SCSS, GraphQL, Swift, Python 3, JavaScript 6, C++, Java

Frameworks

React Native, Redux, Next.js, Tailwind CSS, Material UI, Swagger, Django, Selenium, Express.js, Bootstrap, Jest, Svelte

Paradigms

Agile, UI Design, UX Design, Mobile Development, Microfrontends, Responsive Web Design (RWD), Testing, DevOps, Search Engine Optimization (SEO)

Platforms

Windows, MacOS, Web, Amazon Web Services (AWS), Firebase, Mobile, AWS Lambda, Twilio, Android, iOS, Heroku, DigitalOcean, Google Cloud Platform (GCP), Vercel, Docker, Jupyter Notebook, Shopify, RevenueCat, Blockchain

Storage

PostgreSQL, MySQL, Cloud Firestore, NoSQL, Database Management, Microsoft SQL Server, Databases, MongoDB, Google Cloud, Amazon S3 (AWS S3), Redis, Amazon DynamoDB

Industry Expertise

Social Media

Other

Full-stack Development, Mobile Web, Front-end, Back-end, APIs, Design, Firebase Cloud Functions, Full-stack, Front-end Development, User Interface (UI), Push Notifications, Generative Pre-trained Transformers (GPT), Maps, HTTPS, MERN Stack, API Integration, App Store, Google Play Store, Subscriptions, Stripe Subscriptions, Communication, Design Systems, Styled-components, Mobile Apps, Architecture, Currency Exchange, Startups, Front-end Architecture, Google Cloud Functions, In-app Purchases, Mobile Architecture, Payment Gateways, Axios, JSON REST APIs, Wireframing, Mobile Applications, Material Design, Mobile First, Deployment, Version Control, Cross-browser Compatibility, OAuth, Social Networks, Social Networks Development, App UI, Authorization, Payment Processing, Apple Pay, Google Pay, Back-end Development, Leadership, UI Animation, Apollo, React Native Reanimated, Mobile App Development, Supabase, Checkout, Payment APIs, Caching, Lazy Loading, UI Components, Atomic Design, Headless UI, Web Components, Minimum Viable Product (MVP), Broadcasting, Streaming, Text to Speech (TTS), Prototyping, SDKs, Data Scraping, Retrieval-augmented Generation (RAG), Dating Apps, Large Language Models (LLMs), React Components, Chatbots, Web Development, AI Tools, Responsive Web Apps, Localization, User Experience (UX), Software Architecture, Location Tracking, Data Visualization, OpenAI, OpenAI GPT-3 API, OpenAI GPT-4 API, eCommerce, Cloud Infrastructure, Tailwind UI, Chrome Extensions, Artificial Intelligence (AI), Image Processing, Machine Learning, FastAPI, Animation, CI/CD Pipelines, PayPal, ChatGPT API, Web3, Webhooks, UI Development, Web UI, Security, PCI DSS, Storybook, SvelteKit, Cryptocurrency, Crypto, Open-source LLMs

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