Abhishek Tyagi, Developer in Gurugram, Haryana, India
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Abhishek Tyagi

Verified Expert  in Engineering

Android Developer

Location
Gurugram, Haryana, India
Toptal Member Since
October 11, 2018

Abhishek has been doing Android development since 2014, is an entrepreneur, and understands the importance of proactivity and results. He has contributed to apps with more than five million downloads and worked with startups where he was the sole developer and leading a team of developers for big companies. Abhishek is an extremely detail-oriented person and goes the extra mile to make beautiful apps.

GitAndroidJavaSQLSwiftiOSKotlinModel View ViewModel (MVVM)GoGoogle MapsMySQLAmazon Web Services (AWS)Node.jsDevOpsDocker

Portfolio

Uber
Dagger 2, RxJava 2, Java, Kotlin, Android, Go, SQL, Amazon Web Services (AWS)...
Times Internet
Swift, iOS, RxJava, Kotlin, Java, Android, SQL, Amazon Web Services (AWS)
OrangeTwig
Node.js, Swift, iOS, Java, Android

Experience

Java - 6 yearsGit - 6 yearsAndroid - 6 yearsiOS - 4 yearsSwift - 4 yearsKotlin - 3 yearsModel View ViewModel (MVVM) - 3 yearsClean Architecture - 3 years

Availability

Part-time

Preferred Environment

Git, Android Studio, MacOS

The most amazing...

...task I did was integrating UberPay APIs in the Uber payment framework. This allowed removing eng dependency in adding new payment providers to Uber apps.

Work Experience

SDE 3

2019 - 2022
Uber
  • Migrated Uber Push infrastructure from SSE (Server-Sent Events) to gRPC.
  • Integrated UberPay APIs in the payment framework, which allows any third-party payment provider to add its payment method in Uber apps instead of developers implementing each provider. This resulted in a saving of around 430 eng. workweek per year.
  • Developed Uber Prescriptions, a new vertical in Uber itself to deliver prescriptions to users in the US.
  • Worked on the UberPay payment methods, which unlocked $50M gross booking in just three months of launch.
  • Created a new multistep checkout experience for the Uber Eats app.
Technologies: Dagger 2, RxJava 2, Java, Kotlin, Android, Go, SQL, Amazon Web Services (AWS), DevOps, Docker, Google Maps

Senior Full-stack Mobile Developer

2016 - 2019
Times Internet
  • Developed the “Investment” section of the ETMoney app in both Android as well as iOS. It lets you buy mutual funds directly from the app without any paperwork.
  • Developed a new quick solution feature that quickly lets you invest in pre-selected funds.
  • Implemented RxJava support which improved app data flow in-app and made it more reactive.
  • Implemented MVVM with clean architecture which completely decouples logic from UI and greatly improves unit testing and maintaining codebase.
  • Implemented KYC (know-your-customer) flow completely inside the app without any paperwork. We were the first ones to shift this process completely online.
  • Implemented PDF parsing which can parse PDF provided by your mutual fund distributor and add all your outside investments in one tap.
  • Built a stock module that would let users invest in the stock market right from the app.
  • Reworked most of the app's code base to minimize lag on the user's device.
Technologies: Swift, iOS, RxJava, Kotlin, Java, Android, SQL, Amazon Web Services (AWS)

Full-stack Developer

2015 - 2016
OrangeTwig
  • Developed OrangeTwig's Android and iOS app from scratch.
  • Rewrote the image fitting algorithm of Orangetwig for much better performance.
  • Developed a new feature, “Autoplan,” from scratch which automatically posts on your social media account.
  • Added two new platforms, WooCommerce and BigCommerce, to OrangeTwig's web app.
Technologies: Node.js, Swift, iOS, Java, Android

ETMONEY: Direct Mutual Funds, Credit, and Expenses

https://play.google.com/store/apps/details?id=com.smartspends
It is an Android app. The app lets you buy mutual funds in India. The app has more than 5 million downloads in the Google Play Store. It has a lot more features, but I've only built the investment part of this app.

ETMONEY: Investments and Credit

https://apps.apple.com/in/app/etmoney-mutual-funds-sip-fd/id1212752482
This is an iOS app. It lets you invest in mutual funds in India. I built the app's investment section and led a team of three other developers when we started building the iOS version. The app follows MVVM architecture.

Peace of Mind (iOS)

This app is built mostly for personal use. It lets you create a circle of family or friends to know their whereabouts.

Some other features of the app:
- Any member can see the real-time location of any member in the circle.
- Receive real-time alerts when Circle Members arrive at or leave destinations
- Implemented the whole app using Swift, Firebase, RxSwift, Realm, and MVVM with Clean architecture
- Unit testing using XCTest framework
- The back-end is written in Node.js and deployed on Google Cloud Platform

Peace of Mind (Android)

https://play.google.com/store/apps/details?id=com.peaceofmind.familylocator
This app is built mostly for personal use. It lets you create a circle of family or friends to know their whereabouts.

Some other features of the app:
- Any member can see the real-time location of any member in the circle.
- Receive real-time alerts when Circle Members arrive at or leave destinations
- Implemented the whole app using Kotlin, Firebase, RxJava 2, Room, and MVVM with a clean architecture.
- Used Dagger 2 for dependency injection.
- The back-end is written in Node.js and deployed on Google Cloud platform.

Fivestars Pay

Built Fivestars Pay app which is a payment solution for POS (point of sale) systems - Square, Clover, and Toast.

Technology: Kotlin, RxJava, Dagger 2, Accessibility API

Impulse Music Player

https://play.google.com/store/apps/details?id=com.appmetric.impulse.free
It is a gesture-controlled music player for Android. It has some of the most advanced features of any music player on Android
- Gapless playback
- Crossfade
- 5-band equalizer
- Handwave feature which lets you skip songs just by waving your hand above your phone

The app is completely written in Kotlin using MVVM with a clean architecture.

WIP: I'm currently working on allowing an option to stream Youtube video of the current playing song.

The free version has around 85,000 downloads with a rating of 4.3 and the paid version has around 5,000 downloads with a rating of 4.5.

OrangeTwig

I built the iOS as well as Android app for OrangeTwig. The app handles scheduling marketing posts on the social media accounts of businesses.
Image of Better Android Apps Using MVVM With Clean Architecture publication
Publication

Better Android Apps Using MVVM With Clean Architecture

https://www.toptal.com/android/android-apps-mvvm-with-clean-architecture

Languages

Kotlin, Swift, Java, Go, SQL

Libraries/APIs

RxJava 2, Google Maps, Node.js, RxJava

Tools

Git, Android Studio

Paradigms

Model View ViewModel (MVVM), Clean Architecture, Model View Presenter (MVP), DevOps

Platforms

iOS, Android, Amazon Web Services (AWS), Docker, MacOS

Other

Room, Mobile App Development, Computer Science

Frameworks

Dagger 2

Storage

MySQL, Realm, PostgreSQL, MongoDB

2011 - 2015

Bachelor's Degree in Computer Science

Indian Institute of Technology Roorkee - Roorkee, India

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