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# Senior Frontend Payments Engineer

- **Company:** Plasma One
- **Location:** London, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Mobile Application Software, Data Streaming, TypeScript, ReactJS, Backend, React Native, Front End Software Development
- **Published:** June 23, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/x/39778180/

## About the Role

A senior, hands-on engineer with strong experience building React and React Native applications in production.
Comfortable operating full stack, but with a clear frontend-first mindset.
Strong instincts around state management, data flow, performance, and user experience.
Able to reason about complex systems and present them clearly through UI.
Comfortable owning features end-to-end, from architecture to production and iteration.
Calm in ambiguity, opinionated when it matters, and thoughtful about tradeoffs.

Nice to have

Experience building consumer fintech or financial products.
Experience with mobile-first or cross-platform product development.
Familiarity with TypeScript across frontend and backend.
Experience working close to launch or scaling early-stage consumer products.
Interest in crypto or stablecoins (or curiosity to get up to speed quickly).

## Description

The frontend team builds the surfaces people trust with their money. This includes our mobile app (React Native), web experiences (React), and the layer between user experience and backend systems.
As a Senior Frontend Engineer, you operate across the full stack, but your strength is the frontend. You think deeply about state, performance, reliability, and how complex financial systems are represented clearly and safely to users.
This is not a pixel-only role. You will help define frontend architecture, influence product decisions, and set engineering standards across web and mobile. You will work closely with design, backend, and product to ship experiences that feel calm, predictable, and trustworthy, even when the underlying systems are complex.
What you will do

Build and own core product surfaces using React and React Native, powering critical flows like onboarding, balances, sending, and receiving money.
Design frontend architecture that scales across platforms while maintaining consistency, performance, and reliability.
Own complex client-side state, async workflows, and error handling for real-world financial interactions.
Work full-stack where needed, collaborating closely with backend engineers and contributing to APIs and system design.
Partner deeply with design to translate intent into precise, production-quality experiences.
Anticipate and design for edge cases: latency, partial failures, retries, and degraded states.
Set standards for frontend quality, testing, performance, and maintainability.
Help make a stablecoin-powered product feel boring in the best way: fast, clear, and dependable.


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