What are the responsibilities and job description for the iOS Mobile Application Developer - Swift & SwiftUI position at Seneca Resources?
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, NY is 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 Responsibilities
iOS 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 Skills
Skill Area
Requirement
Priority
iOS Application Development
18 months
Critical
Swift / SwiftUI
Hands-on professional experience
Critical
Objective-C
1–2 years targeted
Critical
Xcode / Instruments
Hands-on experience
Critical
Core Data / SwiftData
Hands-on experience
Critical
GCD / Concurrency / Multithreading
Hands-on experience
Critical
REST APIs / JSON
Hands-on experience
Critical
MVC / MVVM & Design Patterns
Hands-on experience
Highly Relevant
GitHub / CI/CD
Hands-on experience
Highly Relevant
Firebase / Crashlytics / Sentry.io
Hands-on experience
Highly Relevant
Unit Testing / Code Reviews
Hands-on experience
Highly 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
Swift
SwiftUI
Objective-C
Xcode
Instruments
Core Data
SwiftData
Grand Central Dispatch (GCD)
REST APIs / Web Services
JSON
GitHub
Firebase
Crashlytics
Sentry.io
Cursor
Swift Package Manager
Carthage
CI/CD
Kotlin
CoreBluetooth / BLE
MFi / External Accessory Framework
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, NY is 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 Responsibilities
iOS 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 Skills
Skill Area
Requirement
Priority
iOS Application Development
18 months
Critical
Swift / SwiftUI
Hands-on professional experience
Critical
Objective-C
1–2 years targeted
Critical
Xcode / Instruments
Hands-on experience
Critical
Core Data / SwiftData
Hands-on experience
Critical
GCD / Concurrency / Multithreading
Hands-on experience
Critical
REST APIs / JSON
Hands-on experience
Critical
MVC / MVVM & Design Patterns
Hands-on experience
Highly Relevant
GitHub / CI/CD
Hands-on experience
Highly Relevant
Firebase / Crashlytics / Sentry.io
Hands-on experience
Highly Relevant
Unit Testing / Code Reviews
Hands-on experience
Highly 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
Swift
SwiftUI
Objective-C
Xcode
Instruments
Core Data
SwiftData
Grand Central Dispatch (GCD)
REST APIs / Web Services
JSON
GitHub
Firebase
Crashlytics
Sentry.io
Cursor
Swift Package Manager
Carthage
CI/CD
Kotlin
CoreBluetooth / BLE
MFi / External Accessory Framework
Salary : $78 - $88