Popsa

Senior iOS Engineer

Posted 2 Days Ago

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London, Greater London, England

Hybrid

Senior level

Artificial Intelligence • Information Technology

Popsa has been one of Europe's fastest-growing AI companies in the last few years, according to Deloitte and the FT.

The Role

Develop and enhance a memory curation platform with a focus on creating user-friendly iOS applications using Swift and related technologies. Collaborate on features like photo selection and payment processing.

Summary Generated by Built In

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 programming

Swift Structured Concurrency (async/await, actors)
Combine for reactive data flows and UI bindings

Graphics & visualisation

SceneKit and ARKit for immersive 3D product previews
Custom Metal shaders for advanced rendering effects
Vision and CoreML for on-device photo analysis and face recognition

Photo library integration

Deep PhotoKit integration for accessing and analysing user photo libraries
On-device ML models for face embeddings and photo quality scoring
Smart album generation and photo metadata synchronisation

Third-party integrations

Firebase (Analytics, Remote Config)
Sentry for crash reporting and performance monitoring
Stripe and Braintree for payment processing
GrowthBook for feature flags and experimentation
Nuke for high-performance image loading and caching

CI/CD & quality

GitHub Actions for automated linting, testing, and snapshot testing
Xcode Cloud for continuous integration
Fastlane for release automation
SwiftLint for code style consistency
Snapshot testing for UI regression prevention

Version control & collaboration

Git proficiency with trunk-based development
Pull request workflows with thorough code reviews

Nice to have

Experience with custom drawing, Core Graphics, or advanced UI animations
Performance optimisation and profiling with Instruments
Accessibility best practices and VoiceOver support
Experience integrating on-device ML models (CoreML, Vision)
Background in 3D graphics or AR experiences
Familiarity with localisation workflows for international apps

Top Skills

Arkit

Braintree

Core Data

Coreml

Fastlane

Firebase

Git

Github Actions

iOS

Metal

Nuke

Protocol Buffers

Scenekit

Sentry

Stripe

Swift

Swift Package Manager

Swiftlint

Swiftui

Uikit

Vision

Xcode Cloud

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The Company

London

61 Employees

Year Founded: 2016

What We Do

Joining Popsa now is pretty exciting. According to Deloitte, we’re the UK’s fastest-growing startup of 2020. We have a fast-growing global customer base to match, and the backing of some of the best investors in the world. Our native iOS and Android apps are available in 12 languages – attracting more than 3 million users to date – and we ship to 50 countries around the world. Phew. So why is Popsa so hot right now? The reality is, people have never taken more photos than we do today. Our phones are literally crammed with memories. But although we’re good at capturing moments – we’re not as good at doing anything with them. They’ll often sit forgotten on our devices or in the cloud. Then Popsa came along. Founded in 2016, we’ve built an award-winning app that’s made printing your memories so easy and accessible, anyone can do it. No more barriers. No more time-wasting. In fact, everything we do as a business is designed with this ethos. We help people turn their best moments into something beautiful and lasting, in no time at all. Today we’re best known for photobooks, but our vision of the future goes far beyond print. We’re building a platform to help people to curate their experiences in lots of exciting ways. We want to become THE place where people come to capture their life stories. To celebrate their most important people and relationships. To create lasting meaning from their experiences.