Senior React Native Developer
Ruby LabsAbout us
Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/
About the role
At RubyLabs we’re looking for a Senior React Native Developer to join our growing engineering team and help lead our expansion into mobile. This is a role for someone who cares deeply about product quality, enjoys solving architectural challenges, and wants ownership over real features that users rely on.
You’ll play a key role in building and scaling our mobile applications, shaping the future of our mobile offering, and collaborating closely with backend and product teams to deliver a seamless, reliable, and high-performance user experience.
Key Responsibilities
Contribute to the development and delivery of new mobile product features.
Maintain and improve the existing React Native codebase, performance, and stability.
Define and evolve mobile architecture, system design, and technical strategy.
Partner with backend, product, and design teams to shape solutions that scale.
Drive reliability, performance, and observability standards on mobile.
Own production debugging, incident investigation, and root cause analysis.
Guide improvements in build systems, CI/CD, releases, testing, and app store deployments.
Support hiring and help grow a world-class mobile engineering team.
Champion performance across rendering, navigation, latency, memory, offline behavior, caching, and real-time experiences.
Qualifications
5+ years of experience building mobile applications, with significant React Native experience.
Experience mentoring engineers through code reviews, architecture, and incident response is a strong plus.
Strong understanding of mobile system design, component architecture, state management, navigation patterns, and performance trade-offs.
Experience optimizing UI performance, memory usage, rendering efficiency, and startup time.
Deep knowledge of React internals and rendering behavior (hooks, reconciliation, lifecycle, render cost).
Experience working with native modules and iOS/Android bridging.
Shipped and maintained apps on the App Store and Google Play.
Exp
Opens the company's application page
Listed via
Jobicy
jobicy.com
Similar roles
Design & Tech
Related reads from TCHNX
The Quiet Revolution in Local-First Software
As major platforms face outages and data breaches, a new generation of developers is building applications that prioritise local data storage and peer-to-peer sync, challenging the cloud-first orthodoxy that's dominated tech for two decades.
The Quiet Revolution in Edge AI: Why Your Next Computer Might Not Need the Cloud
As neural processing units become standard in consumer devices, we're witnessing a fundamental shift in how AI applications work. Local processing is no longer a fallback; it's becoming the preferred architecture.
The Rise of AI-Assisted Code Generation 2: Are Developers Becoming Prompt Engineers?
As AI coding assistants reshape software development, the industry grapples with a fundamental question: is writing code giving way to writing prompts? We examine how London's tech scene is adapting to this seismic shift.