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Open nowFirst seen 34 hours ago

Senior React Native Engineer, Secure communication & Payment,

King Deux Search & Consulting348 open roles

Where
Remote
Work mode
Remote
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Your applicationOpen nowSenior React Native Engineer, Secure communication & Payment,King Deux Search & Consulting · Remote

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Early applications get read.

11.5% of postings close within 7 days. Measured by our own scanner across the market.

Share of postings closed within
  1. 2.0%1 day
  2. 4.3%3 days
  3. 11.5%7 days
  4. 18.1%14 days
  5. 35.6%30 days
  6. 44.6%60 days
This job: first seen 34 hours ago

The posting

King Deux Search & Consulting is a specialised executive search firm which offers bespoke talent solutions across financial services and commerce. We are committed to not only finding the right opportunity for our candidates but also leaving a legacy that lives on beyond the hiring process.

Follow us at https://www.careers-page.com/kingdeux for updates on the exceptional clients we represent. Stay up-to-date on industry news and get your career consultation scheduled at kingdeux.com

About Your Company

King Deux is partnering with an ambitious, self-financed start-up with our founders having an entrepreneurial background in AI, Hedge Funds, Biotech and Energy Production. Headquartered in London with our technical team based across the UK and France. We're looking for a Senior React Native Engineer to play a key role in building, improving and scaling our encrypted email app, C.Email and also lead core development of the product itself.

You'll work closely with CTO, cryptography specialist, and engineers to deliver a high-performing, secure, and intuitive product.This is a hands-on engineering role with end-to-end ownership — from development and testing to deployment and user experience improvements. You'll be instrumental in shaping how millions of users communicate securely.

About your role

  • Lead core development of new features from concept to release, owning them end-to-end — from design discussions and prototyping through to testing and deployment
  • Develop and enhance the C.Email mobile app using React Native (Expo + CNG).
  • Improve app stability and performance; resolve bugs and add UI improvements.
  • Implement cryptography improvements for performance and integration.
  • Write modular, testable, maintainable code with clear documentation.
  • Participate in daily stand-ups and code reviews, sharing best practices and ideas.

What you will need to succeed

  • 4-6 years experience in software engineering; strong background in React Nativeand TypeScript.
  • Experience setting up automated tests from scratch — unit, component, and user-simulation tests.
  • Strong understanding of mobile-first architecture (local data storage, offline-first).
  • Experience working in startups or small technical teams (series A or B/ pre VC funding).
  • Experience working with email standards and protocols (e.g. MIME, Gmail API) is a plus.

Technical Skills

  • React Native (Expo) – advanced development and optimisation.
  • TypeScript / JavaScript – daily use and strong understanding.
  • Kotlin / Swift – for native components. Go – used for cryptography
  • C++ – for performance improvements and interface integration (secondary priority).
  • GCP / AWS (light) – basic infrastructure setup and management (SES, AWS lambda, Redis, RDS, EC2 autoscaling)
  • Familiarity with cryptographic principles (key exchange, signing, encryption).

How to Apply

Interested parties, please send your CV directly to [email protected] or apply directly.

Please note that only shortlisted applicants will be contacted.

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