Mid-level to Senior Software Engineer

Plasma's product is where all of this becomes real to people: the app they open every day, the balances they watch grow, the card they spend with. We're looking for a mid-level to senior, fullstack engineer to join one of Plasma's engineering teams and own the product and client-side surfaces that team is responsible for. Our stack is TypeScript across the board - Node.js on the backend and React + React Native for the frontend

You'll report into your team's eng lead and partner closely with your product lead to ship production-quality experiences from the API down to the pixel.

Build and own your team's product and client-side surfaces end to end, in React and React Native - from the API down to the pixel.

Care as much about how a screen feels as whether it's correct: performance, responsiveness, and the small interactions that make the product feel trustworthy with someone's money.

Design and build the systems: state management, data schema design and robust handling of real financial data

Partner closely with product and design at the concept level, so the experience and the implementation move as one thing, not two departments.

Own reliability: graceful handling of failures, retries, and edge cases in a product where mistakes cost people real money.

Raise the bar on engineering quality within your team: architecture, testing strategy, performance budgets, and code review.

Mentor other engineers and drive technical clarity on the product side of your team.

You have very high agency and don’t wait to be told a problem to work on and proactively find new problems to solve

A mid-level to senior, hands-on engineer with a track record of shipping and owning production, fullstack systems end-to-end.

Strong product sense: you notice when something feels slow, confusing, or untrustworthy, and you fix it without being asked.

Comfortable taking product surfaces from zero to one, and then scaling them without losing clarity or performance.

Strong judgment on tradeoffs: speed vs. polish, abstraction vs. control, simplicity vs. flexibility.

You communicate clearly, write clean code, and can lead through technical and product decisions.

Experience building product-facing or client-side systems at scale

You make decisions based on data and use data to ground whether solutions work

Experience with React Native or native mobile development.

An eye for interaction and motion design, and a track record of partnering closely with product designers rather than just implementing their files.

Fintech, banking, or crypto-native background.

You’ve been a founder or early employee at a fast-paced, high agency startup

Above-market salary for the level of the role, with token compensation.

A beautiful London HQ with gym access and daily food, for those who thrive in an office environment. Visa sponsorship and relocation support if you're joining from abroad.

Premium health insurance for you and your family, fully covered by Plasma.

Monthly wellness budget, whether that's the gym, therapy, sauna, or massage.

All the tools and tech you need to operate at your best.

Real ownership and responsibility from day one, with your work shipping to hundreds of thousands of people, moving millions of dollars every day.

Data Protection & Privacy We are committed to protecting the privacy and security of your personal data. Any personal information you provide during the recruitment process will be processed in accordance with the General Data Protection Regulation (GDPR) and applicable local data protection laws.