Principal React Native Engineer — FinTech Platform Lead

JPMorganChase; Greater London; On-site; GBP 85,000 - 120,000; Full time

Job summary

A leading financial services provider in Greater London is seeking a Principal Engineer to lead product development initiatives. The role emphasizes collaboration, innovative solutions, and a strong understanding of React Native and Expo. Candidates should possess extensive experience in mobile app development and the ability to effectively lead a high-impact engineering team. This position offers an exciting opportunity to shape the future of fintech products and contribute to a people-first environment.

Qualifications

• Formal training or certification on React engineering concepts.
• Proven delivery of commercial React Native applications in production across Android & iOS at scale.
• Deep understanding of React Native and Expo internals.
• Latest knowledge of architecture, tooling and best practices in mobile app development.
• Mastery of TypeScript.
• Experience optimizing large codebases.
• Hands‑on knowledge of mobile build & release systems.
• Strong grasp of architecture patterns.

Responsibilities

• Establish and refine SDLC optimizing developer experience, velocity and robustness.
• Design a release strategy enabling frequent, stable releases.
• Define and evolve React Native / Expo mobile architecture.
• Design and deliver a modular core platform enabling rapid feature iteration.
• Recruit, mentor and lead a lean, high‑impact engineering team.

Skills

React engineering concepts

Commercial React Native applications

React Native and Expo internals

Mobile app development best practices

TypeScript

Optimizing large codebases

Mobile build & release systems

Architecture patterns

Job description

A leading financial services provider in Greater London is seeking a Principal Engineer to lead product development initiatives. The role emphasizes collaboration, innovative solutions, and a strong understanding of React Native and Expo. Candidates should possess extensive experience in mobile app development and the ability to effectively lead a high-impact engineering team. This position offers an exciting opportunity to shape the future of fintech products and contribute to a people-first environment.