Senior Software Engineer – Mobile Development (iOS)

City of Philadelphia•Philadelphia, PA

4d•$105,000 - $110,000•Onsite

About The Position

OIT is seeking a Senior iOS Developer to lead the design, development, and maintenance of high quality iOS applications that support City services and operations. This role will work closely with product managers, designers, backend engineers, and City department stakeholders to deliver secure, accessible, user centered mobile experiences. The Senior iOS Developer will strongly influence the full mobile development lifecycle from technical discovery and architecture through implementation, testing, deployment, and ongoing iteration. This role requires strong engineering expertise, a collaborative mindset, and a commitment to building digital tools that improve the lives of Philadelphia residents, businesses, and City employees.

Requirements

Deep understanding of modern iOS development principles and mobile UX patterns
Ability to balance long‑term technical strategy with hands‑on implementation
Ability to manage multiple priorities in a dynamic public‑sector environment
Commitment to equity, accessibility, and inclusive design
Strong analytical and debugging skills
Ability to mentor and support other engineers
Solid understanding of iOS development fundamentals including UIKit, Core Data, and iOS frameworks
Experience with Xcode, Interface Builder, and iOS development tools
Knowledge of Apple's Human Interface Guidelines and iOS design principles
Proficiency in Swift/Objective-C programming languages
Familiarity with App Store Connect and iOS app submission processes
Strong problem-solving skills and ability to debug complex mobile applications
Experience with version control systems, preferably Git
Understanding of the modern mobile platform and common architecture
Strong understanding of the key differences in supported hardware and features across the mobile device landscape
Server-side programming languages such as Node.js
Command line and shell scripts
Web application security concerns and ways to mitigate them
SQL, and usage of relational databases such as PostgreSQL, Oracle, MSSQL
Amazon Web Services (AWS)
Containerization
Automated test/deployment pipelines
API design and development
5+ years of professional iOS development experience.
Strong proficiency in Swift, Xcode, and modern iOS frameworks (UIKit, SwiftUI, Combine, etc.)
Experience building and deploying applications to the App Store or enterprise distribution
Experience integrating RESTful APIs and working with backend services
Familiarity with agile or iterative development processes
Strong understanding of mobile architecture, design patterns, and performance optimization
Excellent problem‑solving skills and attention to detail
Strong communication skills and experience collaborating with cross‑functional teams

Nice To Haves

Supervisory or management experience a plus
One or more cross platform mobile frameworks
Have developed and deployed at least one iOS application to the Apple App Store
Demonstrate proficiency in React Native development through portfolio or work samples

Responsibilities

Design, build, and maintain advanced iOS applications using Swift and modern iOS frameworks
Lead technical ios architecture decisions and establish best practices for mobile development
Collaborate with product, design, and backend engineering teams to define requirements and deliver high quality features
Translate user needs and business goals into scalable, maintainable mobile solutions
Collaborate with UX/UI designers to implement pixel-perfect designs optimized for iOS platforms
Integrate iOS applications with APIs, backend services, and City data systems
Ensure applications meet standards for accessibility, security, and performance
Conduct code reviews, mentor junior developers, and contribute to team-wide engineering excellence
Implement automated testing, CI/CD pipelines, and monitoring tools to support reliable deployments
Troubleshoot and resolve technical issues across the mobile stack
Stay current with iOS technologies, tools, and best practices, and advocate for continuous improvement
Support agile delivery practices, including sprint planning, standups, and retrospectives
Communicate progress, risks, and technical decisions clearly to technical and nontechnical audiences