Senior Software Engineer; React Native - UCX

Position: Senior Software Engineer (React Native) - UCX
Location: Greater London

As a Senior Software Engineer, you will lead the development of our mobile applications, ensuring they are reliable, secure, scalable, and delightful to use. You’ll collaborate with product managers, designers, backend engineers, QA automation engineers to support a part of the HL platform.

You’ll have the opportunity to influence architectural decisions, mentor other Engineers, and drive best practices across our mobile engineering discipline.
** What You’ll Do
*** Build and maintain a high-quality React Native application.
* Architect scalable mobile solutions that meet the demands of financial applications (security, performance, reliability).
* Integrate with RESTful and Graph

QL APIs and collaborate 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.
* Work cross-functionally with designers, PMs, and QA to deliver features end-to-end.
* Stay up to date with the latest in React Native and mobile technologies.
** What We’re Looking For
*** 8+ years of professional mobile development experience, with 5+ years using React Native.
* Strong knowledge of JavaScript/Type Script, 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.
* Experience with CI/CD pipelines for mobile apps.
* Strong debugging skills, including performance profiling and memory optimization.
* Excellent communication skills and experience working in agile environments.
** Nice to Have
*** Experience with native iOS (Swift) or Android (Kotlin/Java).
* Experience in fintech or banking applications.
* Familiarity with feature driven modular architecture.
* Experience working with feature flags.
* UI automation testing experience.
** Interview Process
** Stage 1 – Discussion with our Hiring Manager (30 mins)
A brief conversation to explore your background, motivations, and fit for the team and role.

Stage 2 – Technical Interview (60–90 mins)
A hands-on deep dive into your React Native expertise, covering coding, architecture, and problem-solving.

Stage 3 – System Design (60–90 mins)
A high-level design discussion where you outline how you’d architect and scale a complex mobile feature or system.
** Package
* * We offer a
** competitive salary**, depending on experience, alongside a
** generous performance-based bonus scheme**.Your total reward package includes:
* ** Up to 19% pension contribution** - helping you plan confidently for the future
* ** Private medical insurance** - giving you peace of mind and access to top-tier healthcare
* A
** wide range of excellent benefits**, from lifestyle perks to wellbeing support, designed to help you thrive both in and out of work

We believe in recognising and rewarding the impact you make - and ensuring you feel valued every step of the way.
** Working Schedule
** We’re based in the stunning
** Paddington Central offices at 4 Kingdom Street**, a modern workspace designed to energise your day and elevate collaboration.
* ** Landscaped rooftop gardens** - perfect for a breath of fresh air or informal catch-ups.
* ** London’s highest rooftop basketball court** - yes, really!
* ** Wellness amenities
** including showers, lockers, hairdryers, and fresh towels.
* ** Cyclist-friendly
** with secure bike storage and drying rooms.
* ** Stylish lounge areas, booths, and breakout spaces
** for focused work or relaxed chats.
* ** Canalside location
** near Little Venice, with floating restaurants, coffee shops, and a seasonal pop-up garden bar.
* ** Unbeatable transport links** - just steps from Paddington Station and the Elizabeth Line.

We embrace a
** hybrid working model
** that gives you the best of both worlds:
* ** 2–3 days a week in the office
** to connect, collaborate, and enjoy everything the space has to offer.
* ** Remote flexibility
** for deep focus, work-life balance, and personal productivity.

Thi…