Senior React Native Engineer

Join Our Data Products and Machine Learning Development Remote Startup!

At [Employer hidden — view at passion-project.co.uk], we are a dynamic startup committed to crafting innovative systems powered by cutting-edge Big Data and Machine Learning technologies.

We’re currently looking for a Senior React Native Engineer with strong production experience building and maintaining high-quality mobile applications for both iOS and Android.

This role is ideal for someone who has worked in teams of 5+ engineers, taken ownership of architectural decisions, and feels comfortable acting as a senior contributor or tech lead. You will play a key role in shaping mobile architecture, improving performance, and ensuring scalable, maintainable codebases in high-impact environments such as fintech, healthtech, e-commerce, or other high-scale consumer products.

If you’re excited about combining strong mobile engineering practices with data-driven products — and consider yourself a data nerd like us — we’d love to connect.

What We Do

• Leveraging our expertise, we build modern Machine Learning systems for demand planning and budget forecasting.
• Developing scalable data infrastructures, we enhance high-level decision-making, tailored to each client.
• Offering comprehensive Data Engineering and custom AI solutions, we optimize cloud-based systems.
• Using Generative AI, we help e-commerce platforms and retailers create higher-quality ads, faster.
• Building deep learning models, we enhance visual recognition and automation for various industries, improving product categorization, quality control, and information retrieval.
• Developing recommendation models, we personalize user experiences in e-commerce, streaming, and digital platforms, driving engagement and conversions.

Our Partnerships

• Amazon Web Services
• Astronomer
• Databricks

Our Values

• We are Data Nerds
• We are Open Team Players
• We Take Ownership
• We Have a Positive Mindset

Curious about what we’re up to? Check out our case studies and dive into our blog post to learn more about our culture and the exciting projects we’re working on!

Responsibilities

• Lead the design and implementation of scalable React Native applications (iOS + Android).
• Contribute to architectural decisions, including adoption of the React Native New Architecture (JSI, Fabric, TurboModules).
• Build and maintain native module integrations (Swift, Kotlin, Objective-C)
• Implement robust state management and server-state strategies.
• Ensure high performance and optimized rendering across devices.
• Own release processes for App Store and Google Play.
• Implement and maintain CI/CD pipelines and OTA updates.
• Drive testing strategy (unit, integration, e2e).
• Conduct structured and actionable code reviews.
• Communicate technical trade-offs clearly to cross-functional stakeholders.
• Lead or contribute to major refactors and architectural migrations.

Required Skills

React Native & Mobile:

• Strong experience with React Native, including the New Architecture (JSI, Fabric, TurboModules).
• Native module integration using Swift, Kotlin, or Objective-C.
• Experience with Expo (managed and bare workflow).
• React Navigation v6+.
• Advanced animations using Reanimated 3, Skia, or Lottie.

State & Data:

• State management with Redux Toolkit, Zustand, or Jotai.
• Server-state handling using React Query or SWR.
• Implementation of offline-first patterns (MMKV, WatermelonDB, SQLite).
• Experience integrating REST and GraphQL APIs (Apollo or URQL).

Quality & Tooling:

• Testing experience with Jest, React Native Testing Library, and Detox.
• Performance profiling using Flipper, Xcode Instruments, or Android Profiler.
• CI/CD pipelines using EAS Build, Fastlane, GitHub Actions, or Bitrise.
• OTA updates via EAS Update or CodePush.
• App Store and Google Play release management.Error monitoring tools such as Sentry or Datadog

Architecture:

• Experience working with modular monorepo patterns (Nx or Turborepo)Feature-based architecture, code splitting strategies, and design systems.

Communication:

• Excellent English proficiency (written and spoken) – mandatory

Perks

• Remote-first culture – work from anywhere!
• In-Company English Lessons.
• Wellhub or sports club stipend to stay active
• AWS, DBT, Google Cloud, Azure & Databricks certifications fully covered
• Food credits via Pedidos Ya – because great work deserves great food.
• Birthday off + an extra vacation week (Mutt Week! ️)
• Referral bonuses – help us grow the team & get rewarded!
• ✈️️ Annual Mutters' Trip – an unforgettable getaway with the team!

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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