Hire Top Freelance iOS developers with Ultragenius

Ultragenius is a marketplace for top software developers, engineers, programmers, coders, architects, and consultants. Top start-ups and companies choose developers from Ultragenius platform for their critical software projects. Hire from Ultragenius network & scale your engineering team in a matter of few days. 

Trusted By

download (1)

Hire only the top 1% among the 20K+ engineers who have applied to Ultragenius


Freelance iOS app developer

Rishabh is a software engineer having 7+ years of experience developing iOS applications. He has designed apps for iOS phones, macOS, iPadOS, watchOS, and tvOS.

Expert in






10 Years


Full Time


Freelance swift developer

Rishabh is a software engineer having 7+ years of experience developing iOS applications. He has developed many desktop apps and is also expertised in writing server-side web applications.

Expert in






10 Years


Full Time


Senior freelance iOS app developer

Rishabh is a software engineer having 7+ years of experience writing concise and faster mobile applications using Swift. HE has developed multiple iOS applications.

Expert in






10 Years


Full Time

Hire top talented freelance iOS developers with Ultragenius

iOS is most widely used operating system designed by Apple exclusively for developing Apple Inc. manufactured devices. iOS is best known for its service that allows users to interact with their iPhones using tapping, swiping, and pinching gestures.

What Ultragenius offers?

Hire freelance iOS developers through Ultragenius in 4 easy steps

Tell us the skills you need

We’ll schedule a call and understand your requirements.

We find the best talent for you

Get the list of pre-vetted candidates in days.

Schedule the interviews

We will arrange a call after understanding your requirements.

Begin your trial

Start working with Ultragenius with a 1-week trial period.

Developers' Reviews for Ultragenius

Ultragenius offers a great opportunity to work in mission-driven U.S. companies with a great salary. I am glad that I chose Ultragenius to find my dream job.
Jason Martin
Freelance iOS developer
Once you are part of Ultragenius, you don't have to look for another platform which leads you to your dream job. Ultragenius's vetting tests and assessments are unmatchable and helped me a land an excellent job.
Barbara Smith
Senior freelance iOS developer
I will thank to Ultragenius wholeheartedly. It helped me securing a career-growing high paid job which I couldn't think would be possible for me without this top connecting network.
Mark Sommers
Freelance iOS app developer

Join 200+ Fast-scaling Start ups
and Fortune 500 Companies that have hired freelance iOS developers

Including Top Companies


Want to hire freelance iOS developers on your own? Here are the skills you must look for while hiring a freelance iOS developer

Hiring freelance iOS developers might be an intricate task for you if you are a non-technical manager. iOS is widely used operating system in Apple manufactured devices like iPhones, iPads, iPods, Apple TV, Apple wathces, etc.It is used for designing meaningful apps and games for iOS users. But, hiring the freelanceiOS developers is not an easy task when a large number of freelance iOS app developer are competing to grab the job opportunities. So, here Ultragenius is there for you filtering out only the top 1% freelance iOS developers among 20,000 freelance iOS developers who have applied on our platform.

These are the skills you must ensure while hiring a freelance iOS developer –¬†

Steadfast knowldege of HTML and CSS

HTML (Hypertext Markup Language) and CSS (Cascading Style Sheets) are the two must-know core technologies for a freelance iOS  developer. You must hire a freelance iOS app developer who has sufficient experience working with these technologies. Knowledge of Flexbox and CSS Grid, in addition to Bootstrap, Semantic and Structural Styling, and Foundation is a must to a freelance iOS app developer . Along with this, the developer should be well-versed in Javascript libraries especially jQuery and CSS grid systems. 

Javascript fundamentals + ES6

Javascript is most widely used language in developing dynamic web applications and helps a developer integrate back-end with the front-end easily. The¬†freelance iOS developer must be clear with the fundamental concepts of Javascript language. ECMAScript 6 (or ES6) is the current version of ECMAScript and is widely used by developers up to a large extent. The¬†freelance iOS app developers must be familiar with these ES6 skills –¬†

  • Arrow functions
  • Blocked scope constructors let and const
  • Advanced object literals
  • Template literals
  • Multi-line strings
  • Modules
  • Module loaders
  • Binary and octal literals
  • Reflect API
  • Proxies
  • Classes
  • Destructuring assignment
Proficiency using Xcode IDE and Interface builder

Xcode IDE is mainly used for developing iOS applications for Apple devices like iPhones, iPads, Mac, etc. A freelance iOS app developer must be proficient using Xcode and building interactive interfaces and knowing well how to combine them with the Cocoa Touch Framework which is popular for developing applications and allowing to work  flawlessly on various Apple services like Game Changer, Passbook, etc.


Well-versed in Swift 3.0

Swift is the globally used language for developing iOS applications. Freelance iOS developers must be well-versed using Swift 3.0 programming language. Check if the¬†freelance iOS app developers know about the following functionalities –

  • Objective – C interoperability
  • Syntax
  • Switch Statements
  • Object-oriented programming concepts like Classes, objects, Inheritance, etc.
  • Design Guidelines
These are the specific design¬† guidelines which a¬†freelance iOS developer¬†must follow to design unique apps –¬†
  • Delegate Pattern –¬†Delegate Pattern allows¬†freelance iOS app developers¬†to pass information between the objects in Cocoa framework.
  • Model-View-Controller (MVC) –¬†MVC design architecture is mostly used now-a-days for designing applications as it determines¬†how data is stored, updated in the backend to¬† handle client-server interactions, and presented to the client.¬†
Experienced in working with Version Control System (VCS)
Developers must have a very good knowledge of version control systems, like Git, SVN, TFS, and Mercurial. Mostly, developers use Git for their work. It is the version control system that helps the team in collaborating and organizing your code, maintain the frequent changes that occur in the code. Git helps in reviewing the old codes and compares them with the newly updated code, pulling the code from their repository, and managing the commit history.

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 iOS app 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.

In-depth knowledge of Concurrency and Memory Management

Apple Inc. manufactured devices like iPhones, iPads, and many others are memory constrained. The freelance iOS developers¬†must know to design applications that don’t exceed the per-process memory requirement.

Also, they must know to handle concurrent programs preventing iOS applications from freezing while performing multiple tasks.

Knowldege of UI and UX design

You must hire an iOS developer who can monitor the front-end and make appropriate changes to UI sriving better user experience. The¬†freelance iOS 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 ‚Äď 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.¬†

Experience in Source Control

Source Control means handling all the changes done in the source code. Source control is an integral part of an application development which helps developers lessen and remove all the conflicts that arise during development phase in an application. It enables freelance iOS developers to easily communicate and collaborate with the team members in iOS application development.

Proficient knowledge working with databases

iOS development revolves around working with various kinds of databases. Hence, the freelance iOS developer must know about Realm, how it synchronously updates the data objects allowing them to respond to any changes instantly and store them easily. SQLite and Core Data are also the popular databases used today. Check if the developer is proficient working with these databases.

Familiarity with Grand Central Dispatch (GCD)

Grand Central Dispatch (GCD) is the technology designed by Apple Inc. which allows freelance iOS developers to run multiple tasks simultaneously like displaying information on the user screen, reading inputs from the user, pulling data from network, and more without affecting their concurrency. Concurrent programming prevents the iOS applications from slowing down or being crashed when multiple apps are running. Check if the freelance iOS app developer is well-versed in concurrent programming to avoid such scenarios.

Knowledge integrating third-party API(s) and libraries

Application Programming Interface (API) is a set of programs which establishes communication between an end-user and applcations. 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 iOS app developers must  have the skills to integrate third-party libraries and API(s) that needs to be consistently updated and managed. Further, a freelance iOS developer must know how to integrate Software Development Kit (SDK) and third-party libraries in an iOS application using Swift Package Manager or Cocoapods.

Sound experience working with data assets

Today’s increasing online activity has made the data a very crucial factor while designing the applications. Data integration allows a developer¬†to utilize all the available data while developing an iOS application.¬† The¬†freelance iOS developer must possess strong experience handling different data assets, working with various data integration systems, and understanding the role of data, data capability models, and data governance.

Excellent Problem-Solving Skills

The most important part of a developer is to recognize the technical problems in an application and troubleshoot it on multiple iOS platforms. You must hire the freelance iOS developers based on their ability to write clean and optimized code that is understandable by all the team members and streamline the application development.

Pay only after one week trial period

Connect with the top 1% freelance iOS developers of the world at the lowest prices

iOS is the rapidly growing operating system used across multiple Apple devices like iPhones, iPads, Macbook, HomePod Mini, iPad Air 2,  iPods, iMac, Apple TV, Apple watch, and many others.  But recruiting the best freelance iOS developers is not an easy task when a large no. of  freelance iOS app developers freelancers are competing to grab the job opportunities.

Top Interview Questions to ask while hiring a freelance Android developer

iOS is the popular operating system designed by Apple Inc. for Apple manufactured devices like iPhone, iPad, and iPod. iOS architecture is a Layered Architecture, which comprises of four layers, namely, Core OS, Service Layer, Media Layer, and Cocoa Layer.

  • Core OS (Application Layer) : Core OS layer is the core layer of the iOS hardware. In the iOS stack, it is on the bottom and is mainly responsible for operating system services like memory management, file system handling, and threads. The application layer provides access to external resources and accessories, low-level networking, etc.
  • Service Layer : Service Layer is used to design upper layer services that users demand. Grand Central Dispatch, Block Objects, iCloud Storage, Block Objects, and In-app purchases are the core features provided by this layer.
  • Media Layer : Media Layer is used to utilize all the graphics, audio, and video technology of the iOS system. Its main responsibility is to handle media like video, audio, graphics, etc.
  • Cocoa Touch Layer : Cocoa Touch Layer acts as an interface for users to interact with the iOS operating system, including touch and motion capabilities. It is the layer where the different frameworks are created when the application is built.¬†


  • iOS provides multi-tasking without affecting concurrency among processes. With its Grand Central Dispatch (GCD) feature, a user can easily switch between the applications.
  • iOS allows users to integrate the social network interactions with the applications by showing activity streams and sharing content.
  • All of the app notifications are seen in the iOS Notification Center.
  • iOS is a secured system, this means iPhones and iPads‚Äô owners are not allowed to modify the code on the iOS devices and even the source code of iOS apps is not available for developers to interfere with. This makes iOS devices very difficult to hack.
  • Apple‚Äôs iCloud service ensures a high level of data protection and with its backup option the user need not to worry about data loss.

Grand Central Dispatch (GCD) is a low-level Application Programming Interface(API) designed to execute tasks in multicore hardware environment. Tasks like pulling data from the network, displaying the information on the UI, reading instructions from the users when executed together make the system heavy which might lead to system halt. GCD handles multiple tasks by managing a ‚ÄúDispatchQueue‚ÄĚ which is tied to the application‚Äôs main thread. The DispatchQueue executes the tasks asynchronously and concurrently in the order in which they are added to the queue.

Automatic Reference Counting (ARC) is used for applications’ memory management. ARC is like the Automatic Garbage Collection of Java, which initializes memory to apps when needed and deallocates it when it no longer requires it. ARC keeps a record of how many constants, variables, and properties that each class object has. When there is at least one active reference to a class object, ARC will not deallocate that instance. 

Properties are the values/attributes associated with a particular class, enum, or struct. There are two types of properties  - Stored Properties and Computed Properties. 

  • Stored Properties stores the constants and variables provided by classes or structures.


class Programmer{ 

var name : String 

let lang : String 

var totalExperience = 0 



  • ¬†Computed Properties are used for calculations instead of storing them.

class Find_Angle{ 

var deg : Double = 0 

var rads : Double {

get { 

return de*.pi/180



deg = new_rads * 180 / .pi




While executing the program, an iOS application passes through various states. It is referred to as the lifecycle of an application’s thread.

  • Not running State: The application is either not launched or has been closed by the system.
  • Inactive State : The inactive state occurs when the application is entering or leaving its active state. In this state, the application is not ready for accpeting user inputs/events.
  • Active State : The active state of an application means it is currently executing / performing events or accepting user inputs. It is called the normal mode for running applications because the user interface is accessible.
  • Background State : In the background state, the application continues to run in the background but the user interface is hidden.
  • Suspended State : The application is in the background without running its code. The iOS system may delete this application if the memory is low.


The URL scheme is a very popular way of linking pages but deep linking is Apple’s new method of linking the web page and app with the same link. A deep link connects the users directly with a specific web page once the user hits a URL. Deep Linking saves a lot of time of the users locating a particular page and hence improves the user experience. 


    • BundleID is the unique identifier of the iOS applications, no two applications can have the same BundleID, while AppID uniquely identifies a single app or a collection of apps. There are two components of an AppID, namely, - TeamID and BundleID.¬†
    • BundleID can be used for updating apps and can be used for both iOS and OS X.
  • For example, if your website is ultragenius.com and the name of the app is Ultragenius, then the BundleID can be com.ultragenius.Ultragenius, and in QWERTY12345.com.ultragenius, QWERTY12345 is the AppID.


  • NSString : It represents a string. For example, NSString *msg = @‚ÄúHello!!! Ultragenius‚ÄĚ.
  • NSInteger : It represents an integer.
  • NSUInteger : It represents an unsigned integer.¬†
  • BOOL : It represents the boolean value and can be either true or false.¬†
  • Threads : Threads are the independent code of execution within the same program. With the help of threads, multiple parts of an application can be executed simultaneously without affecting the speed of execution of the rest of the application.
  • Dispatch Queues : Dispatch Queues handle the tasks in First-In-First-Out(FIFO) order. It helps in executing tasks concurrently and asynchronously.
  • Operation Queues : Operation Queues is an object-oriented way of managing concurrency. They are built on the topmost layer of Grand Control Dispatch (GCD) system,¬† providing a high-level abstraction among queueing models. Operation Queues are invoked according to the priorities and queues.¬†


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‚ÄĚ, which is a video round that deeply analyzes freelance developers‚Äô 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 Swift 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¬†iOS developers on¬†https://www.ultragenius.club/hire-iOS-freelancer/

Ultragenius provides you the best facility to hire freelancers in more than 50 skills like React, Angular, Javascript, Node, Java, Python, Magento, Ruby On Rails, Golang, PHP, WordPress, .NET, Android, iOS, DevOps, Machine Learning, and many more.

Find the most skilled freelancer with the dev and IT Skills you need

Angular.js Freelancers

React.js Freelancers

Node.js Freelancers

Android Freelancers

Blockchain Freelancers

iOS Freelancers

PHP Freelancers

.NET Freelancers

Javascript Freelancers

Magento Freelancers

Python Freelancers

Ruby On Rails Freelancers

WordPress Freelancers

Full Stack Freelancers

HTML Freelancers

Software Freelancers

Java Freelancers

Typescript Freelancers