Our challenge library

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Challenge by
Rviewer
Beer tap dispenser API
Develop an API to manage self-service beer tap dispensers
Medium
  • Backend Developer
  • Middle · Senior
  • 3 h
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Challenge by
Rviewer
Build a wall
Create the strongest wall of all time! Combine bricks and avoid instability!
Medium
  • Backend Developer
  • Junior · Middle
  • 4 h
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Rviewer
E-wok
Create an online home delivery service for one of the most successful Wok restaurant chains, E-wok.
Easy
  • Backend Developer
  • Junior · Middle
  • Java · JavaScript · Python · + 5
  • 2 h 30 min
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Challenge by
Rviewer
Cartfidential
Create an e-commerce shopping cart based on Blockchain, executing and storing processes in a decentralized way.
Medium
  • Backend Developer
  • Middle
  • Java · JavaScript · Python · + 5
  • 2 h
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Challenge by
Rviewer
DeliverApp
Implement a web app that lets users order snacks from a pub.
Medium
  • Full-Stack Developer
  • Middle · Senior
  • TypeScript · Node.js · Vue
  • 4 h
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Challenge by
Rviewer
Dreadful Cherry Tomatoes
Build a web app that lets users find the latest blockbuster movies.
Easy
  • Frontend Developer
  • Junior · Middle
  • JavaScript · Python · + 6
  • 3 h
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Challenge by
Rviewer
Dreadful Tomatoes
Build a web app that lets users find the latest blockbuster movies and TV shows.
Medium
  • Frontend Developer
  • Middle · Senior
  • JavaScript · Python · + 6
  • 6 h
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Challenge by
Rviewer
EuroVoting system
Build a new voting system with Blockchain, providing a decentralized database and ensuring the immutability of the data.
Hard
  • Backend Developer
  • Senior
  • Java · JavaScript · Python · + 5
  • 3 h
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Challenge by
Rviewer
Event Emitter
Create an event emitter that lets you launch asynchronous events to teammates.
Medium
  • Backend Developer
  • Senior
  • JavaScript · Vanilla
  • 1 h
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Challenge by
Rviewer
Find Four
Create an awesome Find-four game and let the users choose between playing alone or against another friend!
Medium
  • Frontend Developer
  • Junior · Middle · Senior
  • JavaScript · React
  • 4 h
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Challenge by
Rviewer
Firebase Chat
Create a chat application using Firebase as your backend.
Medium
  • Full Stack developer
  • Junior · Middle
  • 6 h
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Challenge by
Rviewer
Fully-connected developers API
Create an API to see if two Twitter & Github profiles are connected
Medium
  • Backend Developer
  • Senior
  • Java · JavaScript · Python · + 5
  • 5 h
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Challenge by
Rviewer
Gallery Tracking Optimizer
Create an amazing gallery and optimize it based on user interest.
Medium
  • Backend Developer
  • Middle · Senior
  • Java · JavaScript · Python · + 5
  • 3 h
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Challenge by
Rviewer
iBull API
Implement an API that lets users buy and sell actions on the stock market.
Easy
  • Backend Developer
  • Middle · Senior
  • Java · JavaScript · Python · + 5
  • 4 h
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Challenge by
Rviewer
Memory game
Create your own Memory Card game based on pairs of cards.
Medium
  • Full-Stack Developer
  • Junior · Middle
  • 4 h
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Challenge by
Rviewer
Optional, a new hope
Fight against the evil Lord NullPointerException implementing your own version of the Optional (based on the Star Wars universe)
Medium
  • Backend Developer
  • Middle · Senior
  • Java
  • 3 h
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Rviewer
PrivaTo-Do
Create a To-Do list API where the tasks and all their history of changes are stored on a Blockchain.
Easy
  • Backend Developer
  • Junior
  • Java · JavaScript · Python · + 5
  • 1 h
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Challenge by
Rviewer
RSS Reader
Create a news aggregator focused on a single industry.
Medium
  • Full Stack developer
  • Junior · Middle
  • Android · iOS· WebApp
  • 4 h
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Challenge by
Rviewer
Safebox API
Create a digital safe deposit box that lets users add items and keep them safe from peepers.
Hard
  • Backend Developer
  • Middle · Senior
  • Java · JavaScript · Python · + 5
  • 4 h
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Challenge by
Rviewer
Spotlist API
Develop an alternative to the Spotify API that lets indie artists easily manage their playlists.
Medium
  • Backend Developer
  • Middle · Senior
  • Java · JavaScript · Python · + 5
  • 4 h
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Challenge by
Rviewer
Thirst App
The webapp to quench your thirst! Order a drink, pay and done!
Easy
  • Full-Stack Developer
  • Junior · Middle
  • JavaScript · Python · TypeScript · + 5
  • 3 h
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Challenge by
Rviewer
Twitter mirroring
Replicate Twitter feed UI in your own app by cloning its interface.
Medium
  • Full-Stack Developer
  • Junior · Middle
  • 4 h
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Challenge by
Rviewer
Unit converter
Create your own app to calculate the equivalence of a value in different units of measurement.
Medium
  • Full-Stack Developer
  • Junior · Middle
  • 4 h
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Challenge by
Rviewer
Unsafebox API
Create a digital safe deposit box that lets users add items and keep them safe from peepers.
Medium
  • Backend Developer
  • Middle · Senior
  • Java · JavaScript · PHP · +6
  • 4 h
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Challenge by
Rviewer
Vending Machine with Java
Create a seamless coffee vending machine experience that replaces old-school vending machines.
Medium
  • Backend Developer
  • Junior · Middle
  • Java
  • 3 h
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Challenge by
Rviewer
Vending Machine with PHP
Create a seamless coffee vending machine experience that replaces old-school vending machines.
Medium
  • Backend Developer
  • Junior · Middle
  • PHP
  • 3 h
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Challenge by
Rviewer
Vending Machine with .NET
Create a seamless coffee vending machine experience that replaces old-school vending machines.
Medium
  • Backend Developer
  • Junior · Middle
  • C# · .Net · .NetCore
  • 3 h