Senior Android Engineer

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