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Hire Top Freelance Android developers with Ultragenius
Hire only the top 1% among the 20K+ engineers who have applied to Ultragenius
Freelance Android Developer
Rishabh is a software engineer having 7+ years of experience creating Android applications using Kotlin and Java.
Mahesh is a software engineer having 3+ years of experience in developing Android applications for smatphones and tablets.
Senior Android Developer
John is a software engineer having 10+ years of experience developing dynmiac web applications using Java, core field being Android development.
Hire top talented freelance Android developers with Ultragenius
Android is most popular operating system developed primarily for applications to smoothly run on touchscreen devices such as smartphones and tablets. Android developers are most in demand because of the increasing Android freelance projects and usability of Android devices.
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Want to hire freelance Android developers on your own? Here are the skills you must look for while hiring a freelance Android developer
Hiring freelance Android developers might be an intricate task for you if you are a non-technical manager. Android is a rich web-application framework developed by Google for building creative and meaningful apps and games, mainly to be used on mobile devices such as smartphones and tablets. But, hiring the freelance Android developers is not an easy task when a large number of Android app developer freelancers are competing to grab the job opportunities. So, here Ultragenius is there for you filtering out only the top 1% freelance Android developers among 20,000 Android app developer freelancers who have applied on our platform.
These are the skills you must ensure while hiring a freelance Android developer –
Steadfast knowledge of HTML and CSS
- Arrow functions
- Blocked scope constructors let and const
- Advanced object literals
- Template literals
- Multi-line strings
- Module loaders
- Binary and octal literals
- Reflect API
- Destructuring assignment
Knowledge of eXtensible Markup Language (XML)
XML stands for eXtensible Markup Language which is used to design formats for data which is used to encode documentation information, information about database records and transactions, and many more. A freelance Android developer must know about XML, which is used to design layouts in Android. The freelance Android developers must know about different types of layouts such as LinearLayout, Relative Layout, Table Layout, Frame Layout, Text View, List View, and Grid View. The XML layout file is linked with the main business logic file written in Java/Kotlin.
Proficient using Android UI
Freelance Android developers must be proficient in using UIs. Check if the freelance Android developer considers cross-device compatibility while developing an Android application. If your application is functioning well but lacks the usage of modern UIs then it won’t be used by your customers in the long run. The freelance Android developers must know about –
- Constraint Layout – It is used to design complex layouts, use appropriate menus, use vector drawables in place of raster graphics apply various kinds of animations to enhance user experience.
- Linear Layout – It is the most basic layout that arranges the program elements either vertically or horizontally.
- Relative Layout – Relative Layout is used to eliminate the use of nested view groups and keep the view hierarchy clear. Instead of using multiple Linear Layouts, you can replace them all with a single Relative Layout.
- Frame Layout – Frame Layout is used to display a single item on the screen by blocking out an area.
- Grid Layout – Grid Layout lays out views in a series of multiple rows and columns. Grid Layout is very flexible and can be used to design simpler layouts and remove or reduce the complex nesting which is required to design beautiful, catchy UIs.
Experienced in working with Version Control System (VCS)
Along with this, the developer must know how to use add, push, pull, and commit commands, branching, and merging as it allows developers to work independently on the code.
Excellent understanding of testing frameworks and tools
Rising quick-deployment needs during the development phase, testing has become developers. Therefore, freelance Android developers should know about Jest, Enzyme, Mocha, Chai, AVA, and Tape for unit testing.
For end-to-end testing, they must know about Selenium, Webdriver, Cucumber.js, Nightwatch.js, Cypress, and Puppeteer.
For integration testing, they must know about Karma.
Detailed knowledge of Android architecture
Android consists of a stack of software components which is categorized into four main layers and five different sub-sections –
- Android Runtime
- Application Framework
- Linux Kernel
- Android Runtime – Android Runtime is used for compiling bytecode into native instructions that are executed later by the device’s runtime environment. It provides the core component Dalvik Virtual Machine, which is a type of Java Virtual Machine that runs apps and android devices. Dalvik VM makes every Android application run on its own and executes files in .dex format.
- Applications – Applications are placed at the top layer in Android architecture. The freelance Android developer writes the application and installs it on the Applications layer. For example, Phone, Contacts, Books, Calendar, and other services, each having a different role in the overall application development.
- Application Framework – Application Framework layer comes up with high-level services such as package manager, resource manager, views system, windows manager, and many more. The freelance Android developers use these services while designing an Android application.
- Android Libraries – Android Jetpack, Square/Moshi, Retrofit, Room, Dager, ButterKnife, MyLittleCanvas, and many more libraries in Android help freelance Android developers to run the code smoothly.
- Linux Kernel – Linux Kernel provides the architectural model for Android that handles the core functionality like memory management, multi-threading, security, and networking.
Knowledge of Front-end frameworks and libraries
Familiarity with at least one of the front-end frameworks is a must for any freelance Android developer like React.js or Angular.js. These front-end frameworks are greatly required in today’s market. React is popular for its faster development of Single Page Applications while Angular uses interpolation, dependency injection, and eliminates coding mistakes by using the strongly typed Typescript that resolves many challenges faced by the freelance Android developers.
Experience in Writing Cross-Browser compatible code
You must hire developers who can write the code that is compatible to run on any browser platform like Mozilla, Chrome, Internet Explorer. Today, cross-browser compatibility is in high demand.
Strong knowldege handling Databases
A freelance Android developer often works with several APIs and databases. Firebase and Parse cloud services provide built-in APIs to store the data and make it cross-compatible across various devices. The Android app freelance developer must also know about Android’s in-built support to use SQL with SQLite database. Check the developer’s knowledge about storing data and use different types of queries to use that data in the application.
Experience implementing Navigation
Android Jetpack library provides the Navigation component which lets Android app freelance developers use navigation from designing button clicks to complex patterns. Navigation is extremely important to know for freelance Android developers because it allows the users to navigate across the different pages of your application. Users might want to share data to some other application, navigate back-and-forth across the application, or launch completely a new activity. These actions can be implemented using Intents in Android. Check the developers’ knowledge about Implicit and Explicit intents. The basic application bar is Toolbar, which helps developers add menu icons, a popup menu, and a navigation drawer icon. Another is BottomNavigationView, which allows an Android app freelancer to switch between various fragments in the same activity.
Experience with web markup and UI, UX Concepts
The developer must have a firm understanding of element positioning, displaying the elements, and making components interactive, semantic markup, and other related UX Concepts so they can design the product with the best quality. The developer must be experienced in developing visual effects in presentational markup. For, example – How the heading appears, making text larger and putting weight to it, and giving which color to it, and which markup can include captions, bind columns, and row headings to table cells.
Excellent grasping on APIs
Application Programming Interface (API) is a set of programs which establishes communication between an end-user and applications. When an end-user requests some data, the APIs act as an intermediary that execute instructions and get the data from the server and take the response back to the client or end-user. The freelance Android developers must know about Gmail API, Google Analytics API, Google Maps, Weather App API, Kinvey, AppAccelerator, and many more.
Proficient in writing optimized and readable code
You must hire the developers based on their ability to write clean and optimized code that is understandable by all the team members, and is scalable.
Pay only after one week trial period
Connect with the top 1% freelance Android developers of the world at the lowest prices
Today, everyone uses smartphones and tablets and Android is the operating system which runs on it. Developing Android applications is in high-demand. But recruiting the best freelance Android developers is not an easy task when a large no. of Android app freelancers are competing to grab the job opportunities.
Top Interview Questions to ask while hiring a freelance Android developer
Android is a robust Linux-based operating system used on almost all smartphones and tablets. Android is widely used in developing and running apps with basic and advanced functionalities. The components of Android are -
- Activities - Activities is a screen that represents the Graphical User Interface (GUI) of an application on which the users can operate or request any kind of data.
- Services - Services perform backend tasks,
- Content-providers - Content-providers share the data among multiple applications.
- Broadcast receivers - It is a mechanism that listens to system-level events like listening to incoming SMS, calls and more by the host application.
- Android is open-source i.e, you can access it without paying for it.
- Android is platform-independent, i.e., applications can be developed without depending on any external operating system with the help of Android Studio and Android Software development Kit (SDK).
- Android supports Wi-Fi, Bluetooth, Camera, Speech, Google Chrome, Youtube, etc.
- An android app developer freelancer can launch their apps on several platforms Google Playstore, Opera mobile store, Amazon app store, Mobango, SlideMe, etc.
- Android uses a very optimized virtual machine which is Android Runtime (ART) which makes applications faster by reducing the startup time of applications.
An activity is a single-focused screen representing the Graphical User Interface (GUI) of an application. It allows users to interact with the functionalities of that application, for example, dial a phone number, send an email, take a photo, make a google search, etc.
- An activity is a graphical user interface that provides a layer for users to interact with an application while a service performs back-end functions and has nothing to do with GUIs.
- Even if a user switches its application and opens up another activity, the service will continue to run in the background.
- A window assigned to a particular activity may be of fixed size to the windows or slide up and down but service can be used even when the activity window is not present.
- onCreate() - This method is called when the user creates an activity. Using OnCreate(), the views are created and the data gets loaded from bundles.
- onStart() - It is invoked when the activity becomes visible to the user. If the activity is displayed to the user, then the onResume() function is invoked and if it is hidden then the onStop() method is invoked.
- onResume() - onResume() is invoked when the user begins to interact with the activity like dialing a phone number, sending an email, etc.
- onPause() - onPause() is called when the activity is being put to the background but not stopped till yet.
- onStop() - onStop() is called when the activity is not visible to the user anymore.
- onDestroy() - This method is invoked when the user finishes the activity.
- onRestart() - This method is called after the activity is finished and the user restarts the activity.
Activity intent is the message that is shared between components like content providers, activities, services, broadcast receivers, etc. The intent is often used with startActivity() to call an activity, service, content provider, etc. It is used to provide dynamic/run-time binding between the program code in different applications. For example, searching a location on the browser and being directed to Google Maps requires passing of an intent to the system to navigate between different activities within one application or between different applications in an Android Application Environment.
Intents could be implicit intent or explicit intent.
- Implicit Intent - Implicit intent invokes the actions using the system components without specifying them.
For example, if you want to open a webpage, you just type the name of that page and click on Go and the page is opened. Here no component is specified.
- Explicit Intent - Explicit intent provides the external class that needs to be invoked and specifies the components.
For example, there are two activities - FirstActivity and SecondActivity. There is one button on the FirstActivity naming “Go to other activity”, so you can move to SecondActivity. There is another button on the SecondActivity naming “Go to Home”, so you reach the FirstActivity. This is achieved using Explicit Intent.
The Dalvik Virtual Machine (DVM) is the running environment to execute Android applications. It follows the register-based model which is much faster in executing applications than the stack-based model followed by JVM which takes more memory and is slower than DVM.
With the help of DVM, a device can run multiple instances of the Dalvik Virtual Machine with multiple applications which makes the applications run faster as compared to JVM where only one instance of the Java Virtual Machine is shared with multiple applications.
A Service is an Android component that performs long-running backend tasks while Thread is an operating system feature that allows you to execute tasks in the background.
If the service gets destroyed in the middle, then Android ensures to restart it if you return START_REDELIVER_INTENT or START_STICKY from the onStartCommand() but if a thread is destroyed in the middle of an application due to low memory, the Android doesn’t ensure to restart it.
Service is an Android component so it considers the service priority before killing/destroying a particular application due to low memory while a thread is not an Android component so Android doesn’t consider the thread priority while destroying that application.
Hire freelance Ultragenius Developers based skills
Frequently Asked Questions
Ultragenius is one of the leading platforms for hiring remote talent and connecting freelance and part-time developers with Silicon Valley businesses. We focus on finding the best talents who will perform extremely well and will be easily integrated into your teams. We filter out only the top 1% most skilled freelance developers among the 20K+ developers who have applied on our platform. Candidates have to prove their self-reported experience by giving Ultragenius’ s skill tests.
Ultragenius first tests the developer’s skill set by conducting a two and half hour hiring test. Our hiring test judges a candidate on all aspects like aptitude, case study analysis, verbal and reasoning, coding questions based on data structures and algorithms, software engineering, system design, and more. Then, there is another round for the candidates who are selected from this round called “Higher-level Assessment Skill Test”, which is a video round that deeply analyzes freelance developers’ major skills and asks questions about the projects they have worked upon.
Fill up the form which is on every hiring freelancers’ page and we will inform you once we select the top 1% freelance Android developers matching your job requirements. After analyzing the candidates based on their resumes and two assessment tests, we provide you the feedback quickly. And if the freelancers selected by our team are fit for your job role, then we also provide the onboarding.
Ultragenius offers you only the most skilled freelance developers who are top 1% among the 20K+ freelance developers who have applied on our platform. After a rigorous selection and testing process, we sort out only the top candidates for you. You can check out Ultragenius’ s selection process for hiring freelance Android developers on http://www.ultragenius.club/hire-android-freelancer.