Senior C++ UI Engineer (macOS/iOS) – Equity & Perks

black.ai; Greater London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A leading design technology company in Greater London is seeking an experienced software developer with a strong background in Objective-C and C++. The role involves building high-performance UIs, contributing to architectural decisions, and collaborating with design teams. Ideal candidates will have solid GUI development skills and a passion for clean, maintainable code. This position offers a vibrant work environment, flexible leave options, and an inclusive culture.

Benefits

Equity packages

Inclusive parental leave policy

Wellbeing and social connection allowance

Flexible leave options

Qualifications

• Several years of experience in Objective-C and C++.
• Hands-on iOS or macOS development experience with strong knowledge of Xcode.
• Proven ability to build high-quality, maintainable applications.
• Strong GUI development skills for Mac and iOS, focusing on usability and performance.
• Solid foundation in object-oriented design and design patterns.
• Experience with vector, DTP, or imaging applications is a plus.
• High attention to detail and pride in writing clean, reliable code.
• Clear communicator who enjoys learning, collaborating, and solving complex problems.

Responsibilities

• Build high-performance, elegant UIs in C++ and Objective-C.
• Contribute to architectural decisions across shared libraries and components.
• Optimise code for responsiveness, memory usage, and performance.
• Work on UI that feels native to macOS and iOS.
• Debug and improve complex systems across the Affinity product suite.
• Collaborate with design and QA to deliver pixel-perfect implementations.
• Continuously learn and keep pace with Apple’s evolving frameworks.

Skills

Objective-C

C++

iOS development

macOS development

Xcode

GUI development

object-oriented design

attention to detail

Job description

A leading design technology company in Greater London is seeking an experienced software developer with a strong background in Objective-C and C++. The role involves building high-performance UIs, contributing to architectural decisions, and collaborating with design teams. Ideal candidates will have solid GUI development skills and a passion for clean, maintainable code. This position offers a vibrant work environment, flexible leave options, and an inclusive culture.