Pratham Mehta
Verified Expert in Engineering
Mobile Developer
London, United Kingdom
Toptal member since January 13, 2020
Pratham is a full-stack engineer with 10+ years of experience building products end-to-end. He spent 6 years at Amazon (Prime Video), building and operating services that handle millions of concurrent requests using AWS. He also has deep expertise in React Native, having shipped numerous cross-platform apps for clients worldwide. From cloud infrastructure to polished mobile experiences, Pratham thrives in owning the full stack and communicates effectively within teams.
Portfolio
Experience
- Mobile - 4 years
- React Native - 3 years
- Google Maps - 3 years
- iOS - 3 years
- Android - 3 years
- Firebase - 3 years
- JavaScript - 3 years
- Python 3 - 3 years
Preferred Environment
React Native, Amazon Web Services (AWS), Apple, Android, Apps
The most amazing...
...: I built and ran back-end services at Amazon Prime Video, handling millions of requests as users streamed content on one of the world's largest platforms.
Work Experience
Developer
Fly
- Worked as the sole developer for the front-end and back-end technologies on Fly, an app that allows aviation enthusiasts to log all their journeys across the world.
- Oversaw the end-to-end deployment of the project. Built the iOS app using native and React Native technologies.
- Built the back-end services using Node.js and Python on the Google Cloud Platform.
- Designed, maintained, and updated the app's user interface regularly to align with Apple's yearly iOS updates.
- Delivered the app to the App Store. Managed releases on the App Store, as well as marketing via AppStoreConnect, including in-app events and subscriptions.
Software Development Engineer II
Amazon UK
- Worked as a full-stack engineer in the Prime Video organization for 6 years (2020–2026).
- Built and maintained back-end services handling millions of requests per second as users watched content on Prime Video.
- Used AWS services extensively, including EC2, Lambda, ECS, CDK, CloudFront, S3, EventBridge, SQS, and SNS.
- Built front-end web experiences using React. Built several tools within the organization that were used both within Amazon and by external stakeholders outside of the company.
- Participated in on-call rotations (one week every 1.5 months), developing strong skills in debugging, incident response, and operational excellence.
Freelance Mobile Developer
Striga
- Worked at Lastbit, a cryptocurrency company building software and hardware to help people securely store and spend their cryptocurrency.
- Collaborated with the Lastbit team to build their entire bitcoin wallet.
- Integrated SegWit, Bech32, BIP44, BIP49, and so on into the bitcoin wallet.
- Implemented a lightning wallet that was deeply integrated with the bitcoin on-chain wallet.
Chief Technology Officer
GrabbnGo
- Served as the CTO of GrabbnGo and was responsible for the entire tech stack.
- Filed a patent at GrabbnGo for "Delayed Just In Time Ordering."
- Architected the entire system along with the schemas, technologies, and frameworks used.
- Built a real-time location arrival and departure prediction and engine.
- Developed an end-to-end inventory and order management system capable of maintaining inventories of large grocery stores.
- Built an indoor-mapping solution capable of mapping building layouts like grocery stores, malls, or airports, and provided real-time directions.
Summer Intern
Microsoft
- Built a tool to enable teams across Microsoft to quickly deploy build, test, and production environments.
- Worked extensively with Azure and Azure VM Management.
- Supported automated environment deployments with ARM templates.
- Performed system configuration and automation using desired state configuration.
Experience
Corproof | An App to Help Construction Workers Have Safer and More Productive Lives
Project Details:
• The app was designed as an offline-first app where all data was locally cached. Even form submissions are saved locally and submitted when an internet connection is available.
• The app uses Firebase cloud messaging for notifications.
• The app uses the Geolocation API to get the location of the user.
• The app works with complex and dynamically generated forms based on an API.
lastbit | Secure App/device to Store and Spend Your Cryptocurrency
https://lastbit.ioI worked as a freelancer at lastbit and helped build the iOS and Android apps on React Native. The app works with several advanced technologies like Bech32, SegWit, and more.
The app also features a lightning wallet for Bitcoin where users can instantly make transactions without having to wait for on-chain confirmations.
Shyne! | Make Music
The app features an Audiobus integration, in-app purchases, multi-channel audio processing, and file management.
GrabbnGo | Virtual Drive-through App
I was responsible for the entire tech stack at GrabbnGo and built the app from scratch in React Native. I also built part of the server in Django.
Education
Bachelor of Technology Degree in Information Technology
VIT University - Vellore, India
Certifications
Improving Deep Neural Networks: Hyperparameter Tuning, Regularization, and Optimization
Deeplearning.ai via Coursera
Neural Networks and Deep Learning
Deeplearning.ai via Coursera
Understanding Einstein: The Special Theory of Relativity
Stanford University via Coursera
Skills
Libraries/APIs
Google Maps, React, REST APIs, React Navigation, Claude API, Node.js, Facebook Login, Core Audio
Tools
Sketch, GitHub, Reactotron, AWS IAM, Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS)
Frameworks
React Native, Django, Express.js, .NET, Windows PowerShell, The Amazing Audio Engine (TAAE)
Paradigms
Event-driven Architecture, ACID, UI Design, UX Design, Human-computer Interaction (HCI)
Platforms
iOS, Android, Firebase, Mobile, Apple, MacOS, Windows, Linux, Blockchain, Azure, Visual Studio Code (VS Code), Amazon Web Services (AWS), Amazon EC2
Languages
JavaScript, Python 3, Java, SQL, C#, Java SE (Core Java), TypeScript, Python
Storage
PostgreSQL, NoSQL, Redis, Amazon S3 (AWS S3)
Other
Location Services, Apps, User Interface (UI), API Integration, Infrastructure, Event-driven Systems, Full-stack, Mobile Apps, AI Integration, Mobile App Development, OOP Designs, Ledgers, QR Codes, Transactions, Bitcoin, Google Cloud Functions, Operating Systems, Data Structures, Algorithms, Secure Storage, APIs, AWS ECS Fargate
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