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Hire dedicated freelance Swift developers with UltraGenius
Swift is a robust general-purpose programming language designed for iPhones, iPads, macOS, watchOS, and tvOS. Swift uses modern approach to design software applications and ensures concurrency and safety using Grand Central Dispatch (GCD) approach which is uniquely designed by Apple. Swift is developed as a replacement to Objective-C. Swift has the following features including powerful in-built handling, enhanced flow control with do, defer, guard, and repeat keywords. Swift also offers the feature of functional programming.
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Want to hire freelance Swift developers on your own? Here are the skills you must look for while hiring a Swift freelance developer
Hiring freelance Swift developers might be an intricate task for you if you are a non-technical manager. Swift is a powerful programming language used for developing software and mobile applications for Apple manufactured devices like iPhone, iPad, macOS, watchOS, tvOS, and more. Swift provides additional features of Spatial Reasoning, Functional Programming, Advanced control statements with do, defer, guard, and repeat keywords, powerful built-in error handling, Concurrency using Grand Central Dispatch, and more security to a software application. But, hiring the most skilled freelance Swift developers among thousands of developers is challenging for anybody. So, here UltraGenius comes to assist you while recruiting the top freelance Swift developers on your own. UltraGenius understands your job requirements and gets you only the top freelance Swift developers who are well-versed in developing iOS applications with Swift.
The following skills you must look for while hiring a freelance Swift developer –
Good knowledge of Swift ecosystem and features
Swift has a standard library encompassing various data types including data types (Int, Double), collections (Dictionary, Array), characters, strings, low-level primitives like UnsafeMutable Pointer, functions, and protocols. Swift provides a tool called gyb, which is used for generating repeated code from template which saves a lot of time of freelance Swift developers. Also, check if they know Grand Central Dispatch (GCD) mechanism which provides concurrent execution of programs using libdispatch and XCTest library for writing unit tests.
Firm understanding of Object-Oriented Programming Concepts
Object-Oriented Programming helps to implement real world entities. There are four pillars of OOP – Encapsulation, Inheritance, Abstraction, and Polymorphism. Encapsulation means binding the data members and member functions inside a single unit called class. A class is the fundamental unit of OOP and represents the blueprint of an object. Inheritance gives developers the facility to reuse the code multiple times whenever and wherever needed. Abstraction is the mechanism to show only necessary details of a class, hiding its implementation details. Polymorphism means the ability to have many forms. There are two types of Polymorphism – Compile-time Polymorphism and Run-time Polymorphism.
Experience working with Cocoa and Cocoa Touch
Swift freelance developers should be aware of Cocoa, which are embedded sets of frameworks that provides a run-time environment and object-oriented set of programmatic components. Cocoa provides excellent infrastructure for event-driven applications and a rich collection of ready-made objects for the user interface of an application. Cocoa Touch is the application framework layer (based on Objective-C) for iOS devices. Cocoa Touch mainly include Map Kit, iAd, and Game Kit.
Excellent understanding of testing frameworks and tools
For the development phase, developers need to be able to test their code. Test skills like Jest, Enzyme, Mocha and Chai are important for freelance Swift developers with unit testing needs. For end-to-end testing they should know Selenium, Webdriver, Cucumber JS, Cypress and Puppeteer; integration tests will require Karma.
Experienced in working with Version Control System (VCS)
Freelance Swift developers must have a very in-depth knowledge of version control systems like Git, SVN, TFS, and Mercurial. They mostly use Git for their work as it is the most popular system in place that helps out with collaborating on code and organizing them. Along with this, devs should know how to use add commands which let you pull code from your repository while pushing commits to the branch or merging two branches into one when needed. It also lets developers work independently on codes by creating branches before they push changes.
Familiarity with Spatial Reasoning
Spatial reasoning allows Swift freelance developers to foresee and visualize the spatial relations among objects and gives them the ability to manipulate 2-D and 3-D designs and objects, enables them to see changes and movements between shapes, and search the specific patterns between those shapes. The Swift freelancers must understand the input / control types available for the different devices like iPhone, iPod, Apple TV, and Apple Watch while designing the interfaces.
Proficienct using Xcode IDE, AppCode, and CodeRunner
Xcode is Apple’s Integrated Development Environment for developing iOS applications. Xcode IDE is at the center for Swift application development. Xcode provides a convenient interface with its in-built Interface Builder, Graphical Debugger, Source Editor, Version Editor, and Assistant Editor.
AppCode is another editor for macOS/iOS application development. Its unique feature its that it will highlight every error or waning while doing static analysis, AppCode provides a top quality unified interface for Version Control System like Git, Github, Mercurial, and SVN.
Experience with web markup and UI, UX Concepts
Developing a software application becomes an easy task if the freelance Swift developer is familiar with designing concepts and guidelines. The freelance Swift 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.
Knowledge of Cocoa design patterns
Cocoa offers design patterns providing general solutions to recurring problems in an application. Design patterns are a tool of abstraction which is very useful in software development process. For instance, the Delegate pattern in which one object acts as on the behalf of or in co-ordination with another object. The Abstract Factory Pattern which provides the interface for creating object families of related or independent objects.
Detailed knowledge of Grand Central Dispatch
The freelance D3.js developer must have a strong problem solving skill as it helps developers to utilize existing solutions for the projects more efficiently, thinking abstractly, and enables them to write pseudocode for their project. The developer must know how to debug the code as well. Also, check if the freelance D3.js developer is able to write clean and concise code and can fluently communicate with other team members while explaining the code.
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Connect with the top 1% freelance Swift developers of the world at the lowest prices
Swift is the core programming language for developing applications for Apple designed devices including iOS, iPhone, iPad, iPod, watchTV, OS X, and more. A Swift freelance developer does the job of developing multi-threaded applications without affecting their performance. But, recruiting the freelance Swift developers is not an easy task when a large no. of developers are competing to grab the job opportunities.
Top Interview Questions to ask while hiring a freelance Swift developer
- 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.
An Optional is a type in Swift which takes care of how to handle NIL values in Swift. In other words, an Optional can hold either any value or may contain NIL value.
To create an Optional in Swift, add a question mark (?) after any data type -
var number: Int? = 10
Swift provide the concept of defer statements to execute program code just before transferring control outside the scope in which the defer statements are declared. The statements inside the defer get executed independent of program execution.
Swift provides the concept of lazy property which is a property which does not compute its initial value until the first time it is used.
The lazy property must always be declared with the var keyword as its initial value is obtained only after the intialization of an instance is completed.
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 “DispatchQueue” which is tied to the application’s 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.
Along with managing static typing, Swift also has the support for rich metadata of the types, which provides the facility to inspect and manipulate the values arbitrarily at run-time. Swift provides a Mirror initializer which accepts a random value. As a result, the Mirror instance provides Swift freelance developers with the information about the value it contains and also about its children. A child contains an optional value and a label. Mirror can then be used on child values to successfully travers the whole object graph without knowing about the types at compile-time.
Mirror also provides the custom representation in accordance with CustomReflectable protocol. For example, A Dictionary uses it to display its key-value pairs as the labeled children while an Array uses Mirror to display its children as unlabeled children.
The core difference between weak self and unowned self is that the weak reference is optional while the unowned reference is non-optional. The weak self can have nil value inside the closure at some point of time while if access to the unowned reference containing NIL value is made, then the whole program will be crashed.
However, both weak references and unowned references don't increase the retain counts of the objects they are referring.
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 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 Swift developers on https://www.ultragenius.club/hire-swift-freelancer/.