Mobile Engineer

About algo1

algo1 is a VC-backed, stealth-mode startup building behavioural AI for the retail industry. Our platform has been built from the ground up with no legacy systems, no patchwork, just a clean slate and a clear vision. Our mission is to bring the intelligence of modern machine learning directly to the in-store experience, powering real-time, context-aware interactions in physical retail environments through beautifully engineered mobile experiences and developer tooling.

What sets us apart is our obsession with grocery retail and the shopper experience. If you're excited by the opportunity to transform an experience that touches millions of people every day, you'll feel right at home here.

The Role

We're looking for an experienced Mobile Engineer to lead and scale the development of consumer-facing mobile applications and client SDKs designed to transform the shopping experience from home to store.

You’ll collaborate closely with our team of ML engineers, backend platform teams, and product designers to deliver high-performance, cross-platform mobile experiences that feel fast, personalised, and deeply responsive.

What You’ll Own

• Craft high-grade UI/UX. Partner closely with product designers to build fluid, highly polished, and responsive user interfaces that translate complex AI-driven capabilities into intuitive shopper interactions.

• Design cross-platform apps and SDKs. Build our consumer mobile applications and the reusable client SDKs and libraries that sit behind them, using frameworks like Kotlin Multiplatform.

• Own performance and architecture. Champion modern mobile architectural patterns (MVVM/MVI, Clean Architecture) and modularisation strategies, optimising rendering, memory, and frame rates for a premium feel.

• Integrate edge intelligence. Work closely with backend and ML teams to bring on-device models and real-time APIs into user-facing features that feel seamless.

About You

Must Have

• Cross-platform expertise. Proven experience building and deploying production-grade mobile applications using cross-platform technologies like Kotlin Multiplatform, Flutter, or React Native.

• UI/UX craftsmanship. A passion for mobile design, polished animations, micro-interactions, and building high-performance, native-feeling user interfaces.

• SDK development. Practical experience designing, versioning, and supporting client SDKs, mobile libraries, or developer tools.

• Modern architecture. Deep knowledge of mobile architectural patterns, modularisation strategies, and writing clean, scalable, and testable codebases.

• Product-driven mindset. Comfort working in fast-paced startup environments where you actively collaborate with product and design to make high-level technical decisions.

Nice to Have

• Real-time protocols. Understanding of WebSockets, SSE, and managing complex, reactive asynchronous application states.

• Client-side ML. Familiarity with integrating client-side machine learning interfaces (e.g., executing models locally via TFLite or CoreML, or lightweight ML SDKs).

• Early-stage product experience. Background in early-stage product development, building design systems, or creating developer-facing API documentation.

• Native platform experience. Android/Kotlin or iOS/Swift depth alongside your cross-platform framework.

How We Work

We're a startup, so this is a high-intensity environment. The people who thrive here are curious, proactive, and love building. If you're happiest when you're creating, experimenting, and moving fast, you'll fit right in.

We draw our energy from being together, so this is primarily an office-based role. It suits someone who enjoys the quick conversations and shared momentum that comes from building together. Our office is on what we think is the best garden square in London, just a couple of minutes from Tottenham Court Road, so it's easy to get to and a great place to be.

What We Offer

• Competitive salary and meaningful equity.

• 25 days’ annual leave.

• The opportunity to work directly with experienced founders and C-level leadership.

• Real ownership from day one.

• The chance to shape a product used by millions of shoppers.