Senior Software Engineer, iOS (Contract)

The role

You will deliver medium-sized iOS initiatives for the Wikipedia apps, from technical discovery through delivery. You will lead system design for medium projects and work with product, design, analytics and native app engineers.

What you will do

• Deliver medium complexity initiatives from technical discovery through delivery
• Break initiatives into features, drive estimation and manage scope
• Identify risks early and make pragmatic tradeoffs across quality, velocity and user impact
• Improve mobile Wikipedia experiences on iOS for a global, multilingual audience
• Lead system design for medium-sized projects and build accessible, scalable components
• Build software that is easy to test, observe and debug
• Partner with product managers, designers, analysts and native app engineers
• Identify high-impact technical opportunities and risks and help the team set priorities
• Follow team standards in code review, testing, documentation and accessibility
• Plan work with awareness of downstream and upstream effects

Required qualifications

• Bachelor's degree and 5 to 10+ years of related professional experience
• Significant experience building iOS applications
• Strong professional experience with Swift, SwiftUI and UIKit
• Familiarity with architectural patterns in iOS
• Experience with iOS performance optimisation
• Experience working in a self-driven, lean environment
• Commitment to the Foundation's Mission and Values

Nice to have

• Experience adding webview-wrapped experiences to native mobile apps
• Experience maintaining cross-platform mobile applications
• Experience building mobile games or interactive mobile experiences
• Experience with data science, machine learning or AI
• Familiarity with Wikipedia, wikitext, markdown or content management systems
• Experience using agentic coding to scale small engineering teams
• Master's or doctorate degree in computer science, management information systems or STEM field, or equivalent certification
• Prior experience with MediaWiki or Wikimedia projects
• A history of open source contributions

Before you apply

• Hiring is limited to listed US states and countries; non-US employees are hired through a local Employer of Record and must have current work authorization in their location
• Some countries are open only to citizens or permanent residents
• Applicants may contact their recruiter for the pay range specific to their location

About the company

The Wikimedia Foundation is the nonprofit that operates Wikipedia and other free knowledge projects. It is a remote-first organization funded largely by donations, with offices in San Francisco, California.