Senior Software Engineer (React Native)

TL;DR

Senior Software Engineer (React Native): Leading the development of high-quality, secure, and scalable mobile applications for a financial platform with an accent on architectural decisions, performance optimization, and security standards. Focus on building and maintaining robust React Native applications, integrating with backend APIs, and mentoring junior developers within an agile environment.

Location: Hybrid in London, UK (2-3 days a week in office). Sponsorship is not available.

Company

HL is the UK’s largest direct-to-consumer savings and investment platform, trusted by over 2 million clients and administering more than £172 billion in assets.

What you will do

• Build and maintain high-quality React Native applications.
• Architect scalable mobile solutions focusing on security, performance, and reliability.
• Integrate with RESTful and GraphQL APIs, collaborating closely with backend teams.
• Optimize app performance, including memory usage, load times, and smooth UI interactions.
• Implement high-security standards such as encryption, biometrics, and secure data storage.
• Lead code reviews, share best practices, and mentor junior developers.

Requirements

• 8+ years of professional mobile development experience, with 5+ years using React Native.
• Strong knowledge of JavaScript/TypeScript, ES6+ features, and modern React patterns.
• Experience integrating third-party libraries, analytics tools, and mobile SDKs.
• Strong understanding of secure mobile development, especially within financial or regulated environments.
• Familiarity with state management and CI/CD pipelines for mobile apps.
• Excellent communication skills and experience working in agile environments.
• Must have legal right to work in the UK, as sponsorship is not available.

Nice to have

• Experience with native iOS (Swift) or Android (Kotlin/Java).
• Experience in fintech or banking applications.
• Familiarity with feature-driven modular architecture and feature flags.
• UI automation testing experience.

Culture & Benefits

• Hybrid working model with 2–3 days a week in the office and remote flexibility.
• Up to 19% pension contribution and private medical insurance.
• 25 days holiday plus bank holidays and additional Christmas closure day.
• Flexible working options, enhanced parental leave, and income protection.
• Access to health care cash plans, health screening, and confidential support (mental health counselling, remote GP).
• Unlimited access to fitness providers and wellness coach sessions (Wellhub).

Hiring process

• Stage 1: Discussion with Hiring Manager (30 mins) on background and motivations.
• Stage 2: Technical Interview (60–90 mins) on React Native expertise, coding, architecture, and problem-solving.
• Stage 3: System Design (60–90 mins) on architecting and scaling a complex mobile feature or system.