Senior iOS Engineer

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About Popsa
Joining Popsa right now is pretty exciting. We’re a London-based, Certified B Corp building a memory curation platform that uses on-device intelligence and generative AI to help people find, organise, and relive the moments that matter, turning noisy photo libraries into curated stories with minimal effort and high confidence.
We're also a proven, international growth business. Popsa was recognised in Deloitte's UK Technology Fast 50 (2022), making it our third year running on the list, and was also ranked the 19th fastest-growing software company that year. The Financial Times ranked Popsa as the 5th fastest-growing technology company in Europe and highly ranked in 2022, and in 2023 we retained our place in the FT 1000 for a second year, with an absolute growth rate of 1,000% over the measured period.
Our apps and service operate at global scale, localised across 12 languages, shipping to 50+ countries, with most orders placed from outside the UK. More than 13 million people across 50 countries have used Popsa to turn their photos into something they can actually be proud to share.
People have never taken more photos than they do today, but most of those memories end up buried in clutter. Popsa brings calm to that chaos, automatically surfacing meaningful moments, suggesting structure and themes, generating captions, and laying out designs, so anyone can create something beautiful without design skills. From there, we make it easy to bring curated memories into the real world with premium photo products, including photo books, calendars, prints and photo boxes, delivered internationally.
Private by design. We’re deliberate about what is processed on-device, what is uploaded, and how customer content is protected, so people can trust us with their most personal memories.
Scope
You'll be building and improving a sophisticated memory curation platform that helps users discover their best moments, and create beautiful, personalised products automatically. The app intelligently curates photos from users' libraries, uses on-device ML for face recognition and photo analysis, and renders high-fidelity 3D previews of physical products. You'll work across features spanning photo selection, AI-assisted layout generation, payment processing, and immersive product visualisation.
What you bring to the team
We’re primarily looking for recent experience developing high-quality, consumer-facing iOS apps where finesse, performance, and delight are priorities. Core iOS expertise

• Strong experience developing production apps with Swift
• Deep understanding of UIKit architecture, with growing proficiency in SwiftUI for building modern UI components in a hybrid codebase
• Familiarity with the Coordinator pattern for managing complex navigation flows
• Experience with MVVM and protocol-oriented design
• Understanding of the iOS app lifecycle, including background tasks, widgets, and app extensions
• Proficiency handling resources, permissions, and responsive UI across device sizes

Mindset

• A problem-solving, curious, and inquisitive attitude
• Clear communicator with a keenness to work collaboratively
• Constructive approach to code reviews and architectural discussions

Our Tech stack

• Architecture & Data
• Swift Package Manager for modular dependency management
• Protocol Buffers for efficient data serialisation with our backend
• Core Data for on-device persistence
• Repository pattern for clean data access abstractions

Concurrency & reactive programmingSwift Structured Concurrency (async/await, actors)Combine for reactive data flows and UI bindings
Graphics & visualisationSceneKit and ARKit for immersive 3D product previewsCustom Metal shaders for advanced rendering effectsVision and CoreML for on-device photo analysis and face recognition
Photo library integrationDeep PhotoKit integration for accessing and analysing user photo librariesOn-device ML models for face embeddings and photo quality scoringSmart album generation and photo metadata synchronisation
Third-party integrationsFirebase (Analytics, Remote Config)Sentry for crash reporting and performance monitoringStripe and Braintree for payment processingGrowthBook for feature flags and experimentationNuke for high-performance image loading and caching
CI/CD & qualityGitHub Actions for automated linting, testing, and snapshot testingXcode Cloud for continuous integrationFastlane for release automationSwiftLint for code style consistencySnapshot testing for UI regression prevention
Version control & collaborationGit proficiency with trunk-based developmentPull request workflows with thorough code reviews
Nice to haveExperience with custom drawing, Core Graphics, or advanced UI animationsPerformance optimisation and profiling with InstrumentsAccessibility best practices and VoiceOver supportExperience integrating on-device ML models (CoreML, Vision)Background in 3D graphics or AR experiencesFamiliarity with localisation workflows for international appsWe may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.