iOS Mobile Application Developer - Swift & SwiftUI

Seneca Resources Company, LLC

New York (NY)

Hybrid

USD 107,000 - 121,000

Full time

10 hours ago

Be an early applicant

Get more replies from employers

Send a job-specific resume in minutes.

Job summary

Seneca Resources Company, LLC is seeking an iOS Mobile Application Developer skilled in Swift, SwiftUI, and Objective-C to design, develop, and support native iOS apps in a large enterprise environment. The role emphasizes delivering high-quality, scalable mobile solutions within a hybrid NYC setting.

Requirements include hands-on iOS experience with Core Data/SwiftData, APIs, concurrency, and UI/UX development, plus strong collaboration with business stakeholders.

Qualifications

Hands-on iOS development experience with Swift, SwiftUI, and Objective-C.
Experience with Xcode, Instruments, and performance profiling.
Familiarity with Core Data/SwiftData, APIs, concurrency, and mobile UI/UX development.

Responsibilities

Design, develop, enhance, test, and maintain native iOS applications.
Develop functionality using Swift, SwiftUI, and Objective-C.
Use Xcode and Instruments for development, debugging, profiling, and optimization.
Own assigned development tasks from requirements through implementation.
Develop maintainable, reusable components and apply iOS design patterns.
Support existing apps while developing new functionality.
Collaborate with stakeholders to validate requirements and integrate data services.

Skills

Swift

SwiftUI

Objective-C

Xcode

Core Data/SwiftData

APIs

Concurrency

Design patterns

Testing

UI/UX

Job description

Job Title:iOS Mobile Application Developer - Swift & SwiftUI
Location:Hybrid; New York, NY (3 days onsite, 2 days remote)
Hours: 37.5/week (required 4 weeks unpaid vacation)
Duration: 12+ Month Contract, likely extension
Pay range: $78-$88.25/hr (W2), depending on experience
Interview: Could be onsite in New York, NY or remote via Teams (up to hiring manager). Likely 1-2 rounds of interviews

Our Government client in New York, NYis seeking an iOS Mobile Application Developer – Swift & SwiftUI to design, develop, enhance, troubleshoot, and support production mobile applications within a large enterprise environment.

This is a hands-on iOS development position requiring professional experience with Swift, SwiftUI, Objective-C, Xcode, Core Data/SwiftData, APIs, concurrency, design patterns, testing, and mobile UI/UX development. The developer will take ownership of assigned application development initiatives, work with business stakeholders to validate technical requirements, integrate APIs and data services, troubleshoot production issues, and create supporting technical documentation.

The ideal candidate is capable of working independently while collaborating effectively within a development team. In addition to hands-on coding, this individual should be comfortable assisting other developers with technical challenges, participating in code reviews, and providing technical guidance and mentorship when needed.

Key ResponsibilitiesiOS Application Development

Design, develop, enhance, test, and maintain native iOS applications.
Develop application functionality using Swift, SwiftUI, and Objective-C.
Use Xcode and Instruments for application development, debugging, profiling, and optimization.
Take ownership of assigned application design and development tasks from requirements through implementation.
Develop reliable, maintainable, and reusable application components.
Apply appropriate software design patterns and iOS development best practices.
Support existing production applications while developing new functionality.
Apply mobile application design patterns including MVC, MVVM, MV, and Singleton.
Develop asynchronous and concurrent application functionality using Grand Central Dispatch (GCD), multithreading, concurrency, and operation queues.
Design applications for responsiveness, maintainability, and performance.
Identify and resolve threading, performance, and application lifecycle issues.
Participate in technical design decisions and architecture discussions.

Key ResponsibilitiesiOS Application Development

Design, develop, enhance, test, and maintain native iOS applications.
Develop application functionality using Swift, SwiftUI, and Objective-C.
Use Xcode and Instruments for application development, debugging, profiling, and optimization.
Take ownership of assigned application design and development tasks from requirements through implementation.
Develop reliable, maintainable, and reusable application components.
Apply appropriate software design patterns and iOS development best practices.
Support existing production applications while developing new functionality.

Application Architecture & Concurrency

Apply mobile application design patterns including MVC, MVVM, MV, and Singleton.
Develop asynchronous and concurrent application functionality using Grand Central Dispatch (GCD), multithreading, concurrency, and operation queues.
Design applications for responsiveness, maintainability, and performance.
Identify and resolve threading, performance, and application lifecycle issues.
Participate in technical design decisions and architecture discussions.

Data, APIs & Integrations

Develop and maintain persistent application data using Core Data, SwiftData, and other persistent stores.
Integrate mobile applications with web services and external APIs.
Handle and parse JSON data received from APIs and web services.
Manage application data and ensure reliable interaction between mobile applications and backend systems.
Troubleshoot API, network, data, and integration-related issues.
Support integration of third-party libraries, SDKs, and enterprise services.

UI/UX Development

Translate UI/UX designs and wireframes into functional iOS application experiences.
Develop intuitive, responsive, and maintainable user interfaces using SwiftUI and related iOS technologies.
Collaborate with stakeholders to validate application requirements and user experience expectations.
Identify opportunities to improve application usability and performance.
Ensure developed functionality aligns with approved designs and requirements.

Testing, Debugging & Production Support

Perform application debugging and resolve reported defects in a timely manner.
Develop and execute unit tests for application functionality.
Participate in peer code reviews and maintain established coding standards.
Use application monitoring and diagnostics tools such as Firebase, Crashlytics, and Sentry.io.
Analyze application crashes, errors, and performance issues and implement durable resolutions.
Support CI/CD processes and reliable application releases.
Troubleshoot complex application and integration issues using strong analytical and debugging skills.

Development Tools & Source Control

Use GitHub for source control, collaboration, and code management.
Work with dependency management technologies such as Swift Package Manager, Carthage, or comparable tools.
Utilize Firebase and Crashlytics for application services and monitoring.
Work with modern AI-assisted development tools such as Cursor or comparable solutions where appropriate.
Participate in established CI/CD and software delivery processes.

Technical Leadership & Documentation

Create and maintain clear technical documentation for application functionality, integrations, and development processes.
Assist team members with coding and technical issues.
Provide technical guidance and mentoring to other team members as appropriate.
Vet technical requirements with business stakeholders and clarify implementation requirements.
Communicate technical issues and recommendations effectively to technical and non-technical audiences.
Work independently, take ownership of deliverables, and contribute effectively as a collaborative team member.

Required Qualifications

Bachelor's degree from an accredited college or university in Computer Science or a related field.
Minimum 18 months of professional iOS development experience, with a strong focus on mobile application development.
Hands-on experience with Swift, SwiftUI, and Objective-C.
Experience developing and debugging applications using Xcode and Instruments.
Experience with MVC, MVVM, MV, Singleton, and other software design patterns.
Experience with Grand Central Dispatch (GCD), concurrency, multithreading, and operation queues.
Experience with Core Data, SwiftData, and/or persistent data stores.
Experience consuming web services/APIs and handling and parsing JSON.
Experience with GitHub, Firebase, Crashlytics, and CI/CD.
Experience with application monitoring/error-management tooling such as Sentry.io.
Experience with Swift Package Manager, Carthage, or similar dependency management tools.
Experience translating UI/UX designs and wireframes into mobile application functionality.
Experience developing technical documentation.
Experience with unit testing and code reviews.
Strong analytical, debugging, and problem-solving abilities.
Strong written and verbal communication skills.
Ability to independently own development assignments while collaborating effectively within a team.
Ability to provide technical guidance and mentorship to other developers when needed.

Critical SkillsSkill AreaRequirementPriorityiOS Application Development18+ monthsCriticalSwift / SwiftUIHands-on professional experienceCriticalObjective-C1–2+ years targetedCriticalXcode / InstrumentsHands-on experienceCriticalCore Data / SwiftDataHands-on experienceCriticalGCD / Concurrency / MultithreadingHands-on experienceCriticalREST APIs / JSONHands-on experienceCriticalMVC / MVVM & Design PatternsHands-on experienceHighly RelevantGitHub / CI/CDHands-on experienceHighly RelevantFirebase / Crashlytics / Sentry.ioHands-on experienceHighly RelevantUnit Testing / Code ReviewsHands-on experienceHighly Relevant

Preferred Qualifications

Experience developing Android applications with Kotlin.
Experience integrating payment gateways into mobile applications.
Experience with mobile ticketing solutions.
Experience with ticket validation or QR/barcode scanning SDKs.
Experience with mobile app-to-app integrations.
Experience with CoreBluetooth/BLE.
Experience integrating external hardware and accessories using MFi / External Accessory Framework.
Experience integrating barcode scanners, sleds, receipt printers, or comparable peripheral devices.
Understanding of network protocols.
Experience with cloud technologies.
Exposure to additional development technologies such as C++, PHP, .NET, C#, JavaScript, and Oracle SQL.

Technologies