Android Software Engineer

ActAI; Greater London; On-site; GBP 60,000 - 90,000; Full time

Job summary

ActAI is seeking an Android Developer to own the Android client experience for an AI-first mobile app. You will build production-grade Android applications in Kotlin where AI interactions are central to the product, ensuring performance, reliability, and clarity on devices.

You will integrate AI features via backend APIs, design UX for streaming responses, and collaborate with ML engineers to optimize latency, memory use, and scalability in production environments.

Qualifications

• 3+ years of Android development with Kotlin.
• Experience integrating AI features (LLM, vision, speech).
• Proficient in asynchronous programming with Coroutines/Flow.
• Experience publishing apps on Google Play.

Responsibilities

• Develop production Android apps using Kotlin and ensure AI features are core.
• Integrate AI-powered features via backend APIs.
• Design UX patterns for streaming responses and partial results.
• Optimize performance, memory, and responsiveness for AI flows.
• Implement analytics, logging, and feedback capture.
• Collaborate with backend/ML engineers on API contracts.
• Ensure app stability, security, and scalability in production.

Skills

Android Kotlin

AI integration

Asynchronous Kotlin

REST/GRPC APIs

Performance profiling

On-device ML

Play Store apps

Tools

MLKit

TensorFlow Lite

Google Play Console

REST APIs

Job description

There are over 5 billion users using basic applications today such email, notes, tasks, calendar and they're not AI-native. Our mission is to build proactive applications for anyone in the world, who are not used to complex prompting. We aim to bring intelligence to conversations, errands, organising and workflows, with minimal to no prompting.

Our first application is an agent-first mobile communication app. We believe building applications that users use daily for communication, coordination and collaboration needs will help integrate AI into their lives. The net effect is to eliminate misinformation, achieve low coordination costs, enable high quality tasks and collaboration at scale with minimal or little prompting.

Role

As an Android Developer, AI Apps, you own the Android client experience, how AI feels, behaves, and performs on mobile devices. This is not a thin client role. You will build a production Android application where AI interactions are core to the product, and performance, reliability, and clarity matter.

Focus

• Build and maintain production Android apps using Kotlin.
• Integrate AI-powered features (chat, vision, voice, recommendations) via backend APIs.
• Design UX patterns for AI interactions, including streaming responses, retries, and partial results.
• Optimize performance, memory usage, and responsiveness for AI-heavy flows.
• Implement analytics, logging, and feedback capture to support AI evaluation and iteration.
• Collaborate closely with backend and ML engineers on API contracts and system behavior.
• Ensure app stability, security, and scalability in production environments.

Ideal Experiences

• 3+ years of Android development experience using Kotlin.
• Hands-on experience integrating AI features (e.g. LLM, vision, speech APIs).
• Strong understanding of asynchronous programming (Coroutines, Flow).
• Familiarity with REST or gRPC APIs and structured data formats.
• Strong debugging and performance profiling skills.
• Comfort building in environments with latency, partial failure, and non-deterministic behavior.
• Experience with MLKit or light on-device inference.
• Published production apps on the Google Play Store.

Outcomes

• Stable, smooth, and reliable real-world use android applications.
• Performance is optimized: responsive, low-latency, and efficient on memory and CPU.
• Production issues are detected early, monitored effectively, and resolved with clear root-cause analysis.
• Kotlin / Java
• SQL / noSQL
• TensorFlow Lite (on-device inference)

How We Work

The best products today in the world were built by small, world class teams. We are a high talent density and hands-on team. We make decisions collectively, move at rapid speed, striking a balance between shipping high quality work and learning. Joining our team requires the ability to bring structure, exercise judgment, and execute independently. Our goal is to put in hands of our users a truly magical product