Staff Engineer - Frontend & Mobile (React/React Native)

Flagstone; Greater London; Hybrid; GBP 110,000 - 160,000; Full time

Benefits offered by this job

Hybrid working in London office

Competitive bonus

Personal development budget

Private health care

Life insurance

Matched pension up to 5%

25 days holiday

Job summary

Flagstone is seeking a Staff Engineer focused on frontend and mobile to set technical strategy across a small tribe of squads, driving high-quality React and React Native systems and influencing architecture. You will mentor engineers, shape our design system, and partner with Product to deliver scalable, secure solutions.

Join a culture that blends collaboration with high performance, enabling experimentation, and continued growth.

Qualifications

• Staff Engineer with frontend/mobile focus and leadership experience.
• Deep expertise in React and React Native with TypeScript.
• Experience owning design systems across web and mobile.
• Strong system design skills, SOLID, TDD, DDD, and secure coding practices.

Responsibilities

• Define frontend and mobile technical strategy across squads.
• Mentor engineers and drive architecture decisions.
• Lead evolution of shared design system across web and mobile.
• Collaborate with product and design to solve business challenges.
• Champion observability, performance, and security.

Skills

React

React Native

TypeScript

Design system

SOLID principles

TDD

Security

Azure

CI/CD

Cross-team leadership

Tools

Jira

Job description

Flagstone is seeking a Staff Engineer focused on frontend and mobile to set technical strategy across a small tribe of squads, driving high-quality React and React Native systems and influencing architecture. You will mentor engineers, shape our design system, and partner with Product to deliver scalable, secure solutions.

Join a culture that blends collaboration with high performance, enabling experimentation, and continued growth.