Senior iOS Engineer

Aquent GmbH; London; On-site; GBP 70,000 - 100,000; Full time

Job summary

Aquent GmbH is seeking a passionate Senior iOS Engineer to join a dynamic team at a leading tech company in London. This role involves building scalable UI systems and mobile infrastructure, contributing to high-priority initiatives, and shaping the future of mobile design frameworks. Ideal candidates should have extensive experience in iOS development and skills in PHP or Hack, along with a collaborative spirit.

Qualifications

• 7+ years of professional experience in iOS development.
• Strong knowledge of PHP or Hack for backend integration.
• 7+ years experience with React.

Responsibilities

• Build and support reusable UI components across mobile apps.
• Own native iOS implementation of design system elements.
• Collaborate with PMs and designers for high-quality components.

Skills

iOS development

React

PHP or Hack

Job description

Are you passionate about building scalable UI systems and mobile infrastructure that impact millions of users? We’re looking for a Senior iOS Engineer to join a high-performing team responsible for a cross-platform design system that powers some of the most visible features in consumer mobile apps today.

This role is part of a team building the core mobile design infrastructure used across multiple apps within one of the world’s leading tech companies. You’ll be contributing to high-priority initiatives like GenAI integration and account services, while also shaping the future of mobile frameworks.

What You’ll Do:

• Build and support reusable UI components that scale across a family of mobile apps.
• Own the native iOS implementation of design system elements — working in Swift/Objective-C with integrations via PHP/Hack.
• Collaborate with designers, PMs, and infrastructure teams to build visually stunning, high-performance components.
• Deliver high-quality code for new screens, dialogs, carousels, and animations.
• Support ongoing migrations and legacy infrastructure; participate in experimentation and rollout strategies.
• Optional on-call support rotation (once every 6 weeks – standard business hours).

What We’re Looking For:

Must-Have Skills:

• 7+ years of professional experience in iOS development.
• Strong knowledge of PHP or Hack and experience interfacing iOS with backend components.
• 7+ years’ experience with React.

Nice-to-Have:

• Experience in mobile infra or UI component libraries.
• Prior experience at a large tech company or working on cross-app systems.

Client Description

Our client is the largest social media company in the world. They have substantial B2B and B2C advertising and media platforms, as well as a nonprofit initiative. With the mission of bringing people together, they now boast over 2 billion users and are rapidly developing as they influence the world around us.

#LI-ES5

Aquent is dedicated to improving inclusivity & is proudly an equal opportunities employer. We encourage applications from under-represented groups & are committed to providing support to applicants with disabilities. We aim to provide reasonable accommodation for any part of the employment process, to those with a medical condition, disability or neurodivergence.