Elsewhen - React Native Engineer | Freelance

App Developer is needed in United Kingdom.

Client: Elsewhen

Location: United Kingdom

Contract: Contractor

Job Description

Location: London (Hybrid, 2–3 days/week in office - Located in East India Dock)

Duration: 6–9 months - Outside of IR35

Start date: End of July

Day rate: £450-500

Elsewhen is a London based consultancy designing digital products & services for clients like Spotify, Inmarsat, and Zego. The company has fostered a working environment that is impactful, driven, open, and friendly. They value outcomes over hours and agility over rigid processes. We’re looking for a freelance React Native Engineer with approximately 5 years of experience to help build a brand new product for a client in the telecommunications industry. The candidate will be part of a self-organising and cross-functional Agile team to create a well-crafted mobile app, supporting web and payment integration.

Key Responsibilities

• Design and build robust, scalable React Native mobile apps using TypeScript and Expo.
• Integrate with REST APIs and potentially GraphQL.
• Implement local storage strategies with offline-first logic and background syncing.
• Debug native crashes & troubleshoot native modules using Xcode/Android Studio.
• (Ideally) Integrate secure payment solutions and handle payment workflows.
• Collaborate with backend teams to implement sync logic, authentication, and secure data flows.
• Contribute to scalable project architecture, reusable components, and efficient CI/CD workflows.
• Collaborate 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).
• Experience structuring production-grade React Native apps.
• Familiarity with local storage management and offline-first approaches.
• Comfortable troubleshooting 3rd-party SDKs & forking open-source packages.
• Good understanding of mobile build pipelines.
• 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.

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.