React Native Engineer Freelance Freelance Engineering London

• Location: London (Hybrid, 2-3 days/week in office - (Located in East India Doc)
• Duration: 6-9 months - Outside of IR35
• Start date: End of July
• Day rate: £450-500

About the Client & Project:

Elsewhen is a London based consultancy designing digital products & services for the likes of Spotify, Inmarsat and Zego. Over the past 11 years, Elsewhen has created a working environment that is impactful, driven, open and friendly. We value outcomes over hours and agility over rigid processes.

Join the team - .

We're looking for a freelance React Native Engineer, with circa 5 years experience, to help build a brand new product for a client in the telecommunications industry. You will be part of a self - organising and cross functional Agile team, c reating extremely well - crafted mobile app, supporting web and payment integration .

Key Responsibilities:

• Design and build robust, scalable React Native mobile apps using TypeScript and Expo (managed + ore-build workflows)
• Integrate with REST APIs and potentially GraphQL
• Implement local storage strategies (e.g., Zustand, MMKV) with offline-first logic and background syncing
• Debug native crashes & understand how to troubleshoot native modules using Xcode/Android Studio
• (Ideally) Integrate secure payment solutions and handle payment workflows (credit card, debit card, third-party providers)
• Work collaboratively with backend teams to implement sync logic, authentication, and secure data flows
• Contribute to scalable project architecture, reusable components, atomic design, and efficient CI/CD workflows (Expo EAS, CircleCI, etc.)
• Collaborate closely with other engineers, designers and stakeholders in a co-located team environment
• Participate in code reviews and knowledge sharing

Skills & Experience:

• 5+ years of professional front-end experience, with at least 3+ years of React Native
• Strong knowledge of JavaScript & TypeScript
• Ability to debug and work with native modules (Swift/Kotlin) even if not a native mobile dev
• Experience structuring production-grade React Native apps (atomic design, scalable routing, Expo Router)
• Familiar with local storage management and offline-first approaches
• Comfortable troubleshooting 3rd-party SDKs & forking open-source packages when needed
• Good understanding of mobile build pipelines (EAS, CircleCI, Xcode, Android Studio)
• Ability to demonstrate end-to-end delivery - from MVP to production
• Excellent communication & problem-solving skills

Desirable:

• Prior payment provider integration (Stripe, Adyen, or similar) in a mobile app
• Experience with GraphQL
• Familiarity with telco / eSIM products

Why Join:

• Be part of building a brand new digital product from POC to launch
• Work in a fast-paced, ambitious environment with clear growth plans
• Contribute to meaningful innovation in the telco and eSIM market
• Be supported by an experienced, trusted consultancy team (Elsewhen)

If you're a pragmatic, delivery-focused React Native developer ready to own builds, solve real-world edge cases, and ship a greenfield product, we'd love to hear from you!

Our Commitment to Diversity:

Diverse thoughts, backgrounds, and perspectives create stronger teams and better technology. We welcome everyone, regardless of culture, appearance, or perspective, fostering individuality. We empower our team to challenge norms, grow ideas, and produce their best work.