Develop and enhance the Android app using Kotlin and Jetpack Compose, collaborating with the team on user-facing features and innovative technical designs.
Right now is one of the most exciting moments to join Popsa. Deloitte named us one of the UK’s fastest-growing technology companies, and the Financial Times recognised Popsa among the Top 5 fastest-growing software companies in Europe.
We’re backed by world-class investors, and the world is noticing. Our iOS and Android apps are available in 12 languages, trusted by more than 12 million people who have created over 5 million photobooks shipped to 50+ countries. With more than 350,000 five-star reviews, we’re one of the highest-rated consumer apps anywhere.
But the real story isn’t the numbers, it’s the memories behind them.
We’re living in a time where we capture more photos than ever before. Billions of moments sitting unseen in camera rolls and clouds, mixed with screenshots, receipts, or where we parked the car. We are great at documenting life… but not so great at preserving the meaning in it.
Popsa is changing that.
Since launching in 2016, we’ve built an award-winning platform that removes every barrier to transforming your favourite memories into something beautifully tangible. No design skills. No time-sink. Just the joy of holding real stories in your hands. A celebration of the people and moments that make life worth living.
This is only the beginning.
👉 Learn more about what it’s like to work at Popsa
👉 Read about the technology we're building
👉 Take a look inside our Soho HQ
About the Role
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.
Expertise
- We’re primarily looking for recent experience developing high-quality, consumer-facing Android apps where finesse, performance, and delight are priorities.
- Strong experience developing with Kotlin
- Deep understanding of the Android app lifecycle, activities, fragments
- Hands-on experience building UIs in Jetpack Compose
- Deep knowledge of Composable functions and state management
- Familiarity with Compose Animation APIs
- Proficiency in handling resources, permissions, and responsive UI across devices
Mindset
- A problem-solving, curious, and inquisitive attitude
- Clear communicator with a keenness to work collaboratively
- Constructive approach to code reviews and architectural discussions
Nice to Have
- Custom drawing and advanced Compose UI/animations
- Performance optimisation and profiling experience
- Accessibility best practices
- Familiarity with machine learning models or real-time collaboration features
- Experience with graphics rendering pipelines
Tech Stack
- Architecture & data
- Multi-module Gradle project with a version catalog for dependency management
- Protocol Buffers for efficient data serialisation with our backend
- Realm Kotlin for on-device persistence, with a DAO-layer abstraction
- Repository pattern for clean data access across network and local sources
- Retrofit and OkHttp for networking, with Gson and Protobuf converters
- Kotlin Serialization for type-safe data handling
- Concurrency & reactive programming
- Kotlin Coroutines and Flows for structured concurrency
- RxJava 2 in established areas of the codebase, with coroutine adapters bridging the two
- WorkManager for durable background tasks (image processing, uploads, notifications)
- Graphics & on-device ML
- LiteRT (TensorFlow Lite) with GPU acceleration for on-device inference
- Custom ML models for face recognition, photo aesthetics scoring, and content labelling
- ML Kit for face detection
- OpenCV for computer vision processing
- Firebase ML Model Downloader for OTA model updates
- Photo library integration
- MediaStore API for accessing and analysing user photo libraries
- Custom photo picker supporting local and remote sources (Google Photos, Facebook, Dropbox, Instagram)
- On-device ML pipelines for face embeddings and photo quality scoring
- Third-party integrations
- Firebase (Analytics, Remote Config, ML Model Downloader)
- Sentry for crash reporting and performance monitoring
- Stripe and Braintree for payment processing; Google Pay via Play Services
- GrowthBook for feature flags and experimentation
- Glide and Coil for high-performance image loading and caching
- Mixpanel and Bloomreach for product analytics
- Branch.io for deep linking
- Leanplum for push notifications and messaging
- Pusher for real-time event streaming
- CI/CD & quality
- GitHub Actions for automated builds, PR checks, instrumented tests, and signed release builds
- Kotlinter (ktlint) for code style consistency
- Custom Android Lint rules for project-specific checks
- Paparazzi for snapshot / UI regression testing
- Emerge Tools for APK size analysis and monitoring
- Baseline Profiles for startup performance optimisation
- Version control & collaboration
- GitHub with pull request workflows and actions
To learn more about this role or the company, contact us through https://popsa.com/careers.
If you’re the sort of person who cares about the detail, and stays kind under pressure, you’ll fit in.
Top Skills
Dagger
Git
Jetpack Compose
Junit
Kotlin
Mockito
Mockk
Realm
Room
Rxjava
Popsa London, England Office
Kingly Street, London, United Kingdom, W1B 5PH
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