iOS Software Engineer
Hiring Intelligence & Application Guidance
Direct ATS application. Include measurable achievements and core keywords from the job description.
Initial recruiter screening → Hiring Manager interview → Role-specific practical assessment.
Compensation benchmarked against current UK market rates (GBP).
UK Right-to-Work verified for direct application.
Role Overview & Responsibilities
About A1
There are over 5 billion users using basic applications today such email, notes, tasks that are not AI-native. Our mission is to build a proactive smart assistant for everyday users to bring intelligence to conversations, errands, organising and workflows, with minimal prompting.
Our product focuses on achieving high reliability for long-running workflows, persistent context, and real-world task completion. The system must handle multi-step reasoning, interact with external tools, and remain reliable despite non-deterministic model behavior. Our objective is to help users complete tasks daily enjoyable with over ~90%* reduced time.
Role
As an iOS Software Engineer, you own the iOS client experience, how AI feels, responds, and performs in users’ hands. This is not a thin integration role. You will build a production-grade iOS application where AI interactions are central to product experience, and performance, reliability, and user trust are critical.
Focus
Build and maintain iOS applications using Swift and SwiftUI.
Integrate AI-powered features through backend APIs.
Design UX patterns for AI interactions, including loading states, streaming responses, retries, and fallbacks.
Optimize performance, memory usage, and battery efficiency.
Capture user signals and feedback to support AI evaluation and iteration.
Collaborate closely with backend and ML engineers on API design and system behavior.
Maintain high App Store quality, stability, and production reliability.
Ideal Experiences
3+ years of iOS development experience using Swift.
Hands-on experience integrating AI-powered features into mobile apps.
Strong understanding of async/await, concurrency, and background tasks.
Solid iOS performance and memory optimization skills.
Experience shipping and maintaining production iOS apps.
Comfort designing for latency, partial failure, and non-deterministic AI behavior.
Exposure to CoreML or light on-device ML.
Familiarity with feature flags or remote configuration systems.
Strong intuition for AI UX patterns and user trust considerations.
Outcomes
Stable, smooth, and reliable real-world use iOS 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.
Tech Stack
Swift
SPM
SwiftUI
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
Interview process
If there appears to be a fit, we'll reach to schedule 3, but no more than 4 interviews.
Applications are evaluated by our technical team members. Interviews will be conducted via virtual meetings and/or onsite.
We value transparency and efficiency, so expect a prompt decision. If you've demonstrated the exceptional skills and mindset we're looking for, we'll extend an offer to join us. This isn't just a job offer; it's an invitation to be part of a team that's bringing AI to have practical benefits to billions globally.
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