Mobile iOS Engineer

Pantera Capital; Greater London; Remote; GBP 132,802 - 324,627; Full time

Benefits offered by this job

Equity

Comprehensive medical, vision, and dental coverage

401(k) retirement plan

Short & long-term disability insurance

Life insurance

Discounts and perks

Job summary

A leading AI technology company is seeking an exceptional iOS engineer to join their high-impact team. The ideal candidate will have expertise in Swift and strong skills in performance optimization and UI design. You will craft intuitive mobile experiences that enhance user interaction with AI. This role offers a competitive salary, equity, and comprehensive benefits including health insurance and a 401(k) retirement plan. Join us to redefine mobile AI applications.

Qualifications

• Expert in Swift with knowledge of SwiftUI and UIKit.
• Proficient in memory and performance optimization.
• Ability to design intuitive mobile UIs.
• Skilled in concurrency and reactive programming.

Responsibilities

• Craft intuitive user experiences for AI applications.
• Ensure smooth animations and interactions.
• Build high-performance systems.
• Collaborate with AI researchers on technical decisions.

Skills

Swift expertise

Performance optimization

UI design

Concurrency skills

API integrations

Tools

SwiftUI

UIKit

AVFoundation

Job description

About xAI

xAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands‑on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.

About the Role

We’re seeking an exceptional iOS engineer to join a small, high‑impact team dedicated to creating the world’s most valuable AI application, judged by the impact it delivers to users. You’ll shape cutting‑edge mobile experiences, blending technical mastery with product brilliance. An ideal candidate meets at least the following requirements:

• Expert in Swift, with deep knowledge of SwiftUI and UIKit.
• Proficient in performance optimization—memory, CPU, GPU—using low‑level tools to deliver blazing‑fast systems.
• Experienced in designing and shipping intuitive, pixel‑perfect mobile UIs that redefine how users interact with AI.
• Skilled in concurrency and reactive programming (Combine) for responsive, real‑time apps.
• Built high‑throughput integrations with APIs (REST, gRPC) or AI model outputs, ensuring seamless data flow.
• Capable of owning complex features end‑to‑end, from architecture to App Store deployment, with a focus on speed and scalability.

Additionally, experience in any of the following may set you apart:

• Deep expertise in the Apple ecosystem and related development tools.
• Rust for working with our backend components.
• AVFoundation for real‑time audio processing.
• Track record of shipping standout apps or standout features within apps.

What You’ll Do

1. Dream up and craft delightful, intuitive user experiences that redefine how people interact with AI on mobile.
2. Obsess over every pixel, animation, and interaction, ensuring the experience feels magical and seamless.
3. Build blazing‑fast, highly performant systems where every millisecond counts.
4. Drive technical and product decisions, collaborating with AI researchers and engineers to deploy state‑of‑the‑art models globally.

Who You Are

1. Technically Exceptional: You possess deep expertise in iOS development, particularly with Swift. We seek individuals who operate at the highest levels of their craft.
2. Efficient: You excel at delivering results swiftly, often in a fraction of the time others require. Speed is a core value at xAI—we must act decisively to succeed.
3. Hardworking
4. High Agency: You don’t wait for direction—you take initiative and make things happen.
5. Product‑Minded: You have a sharp product sense, with an ability to empathize with users, anticipate their needs, and translate that into features that delight and deliver value.

Location

You can work out of xAI’s Palo Alto or San Francisco office.

Interview Process

After submitting your application, the team reviews your CV and statement of exceptional work. If your application passes this stage, you will be invited to a 15 minute interview (“phone interview”) during which a member of our team will ask some basic questions. If you clear the initial phone interview, you will enter the main process, which consists of 3 technical interviews:

1. Coding assessment in a language of your choice.
2. Systems hands‑on: Demonstrate practical skills in a live problem‑solving session.
3. Project deep‑dive: Present your past exceptional work to a small audience.
4. Meet and greet with the wider team.

Our goal is to finish the main process within one week. All interviews will be conducted via Google Meet.

Annual Salary Range

$180,000 - $440,000 USD

Benefits

Base salary is just one part of our total rewards package at xAI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long‑term disability insurance, life insurance, and various other discounts and perks.

xAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.