Staff React Native Engineer in St Albans

Mr Who? MrQ - we’re an awesome, award winning online casino launched in 2018. We’re big on tech, big on performance and most of all - big on fun. Over the years, we have experienced explosive growth - which means we need more rock stars to join our quest for total world domination. As we continue to scale, we’re looking for a Senior React Native Developer (L5) to play a key role in shaping and evolving our mobile platform. This is not just a feature-delivery role — this is a high-impact engineering position where you will own critical parts of our mobile architecture, solve complex performance and scalability challenges, and help define how we build mobile applications at MrQ.

What You Will Do

• Own and drive the architecture, design, and development of our cross-platform mobile applications (iOS & Android) using React Native.
• Take responsibility for key areas of the mobile platform, ensuring scalability, reliability, and long-term maintainability.
• Work closely with product, design, and backend teams to deliver complex user journeys (e.g. wallets, bonuses, onboarding, KYC flows).
• Optimise application performance, responsiveness, and stability across a wide range of devices.
• Build and maintain robust integrations with backend systems and third-party services.
• Lead technical decision-making, balancing speed of delivery with long-term quality and scalability.
• Contribute to and evolve mobile architecture, patterns, and best practices across the team.
• Mentor and support other engineers, raising the overall technical bar.
• Improve development processes, testing strategies, and CI/CD pipelines.
• Debug and resolve complex production issues, including performance bottlenecks and race conditions.

What We’re Looking For

• 5+ years of professional mobile development experience, with strong expertise in React Native in production environments.
• Proven experience building and scaling complex mobile applications with high user engagement.
• Strong proficiency in JavaScript (ES6+) and TypeScript.
• Deep understanding of mobile architecture, performance optimisation, and debugging.
• Experience working with native modules (Swift, Objective‑C, Java, Kotlin) and bridging when needed.
• Strong experience integrating RESTful APIs, SDKs, and third‑party services.
• Experience with state management solutions (Redux, MobX, Recoil, or similar) at scale.
• Experience deploying and maintaining apps on the App Store and Google Play.
• Solid understanding of mobile UI/UX principles and building responsive, high‑quality user interfaces.
• Experience with CI/CD pipelines and release processes for mobile applications.
• Strong problem‑solving skills with the ability to operate independently in a fast‑moving environment.
• Proven ability to mentor engineers and contribute to team growth.
• Clear and effective communication skills, with the ability to influence technical decisions.

What We Offer

At MrQ, we take pride in providing an array of fantastic benefits to our valued team members. Enjoy a competitive salary package that recognises your hard work and dedication. Need some extra time off? We’ve got you covered with additional leave days, and we believe in celebrating life’s special moments, including your birthday, with dedicated birthday leave. Family matters to us, too, which is why we offer a generous four‑week parental leave. Your well‑being is our priority, supported by international health and life insurance. Stay motivated with wellness incentives and seize opportunities for personal and professional growth with our growth allowance. Embrace a flexible working environment that caters to your needs, and join our friendly and multinational team, where collaboration and camaraderie flourish. At MrQ, we’re committed to ensuring that your experience with us goes beyond just a job – it’s a fulfilling journey with a supportive community.

We are committed to fostering a workplace that values and celebrates diversity. We welcome individuals of all backgrounds and experiences, and we believe that a diverse and inclusive environment leads to innovation and success. We actively promote equal opportunities for all employees and strive to create a space where everyone’s voices are heard and respected. Join us in our journey to build a truly inclusive workplace where every person can thrive and contribute to our collective success.

To help our recruitment team work efficiently, please apply to the role that best matches your skills and experience. Our team will consider you for other similar roles as well!