Senior Full Stack Engineer£70,000 - £90,000Remote - Brazil (You will need to work UK time zone) You already know how to build software that works.What you might be missing is the chance to build something that matters, where the details count and the users notice when you get it right.This role is for an engineer who cares how things look, how they behave, and how they hold up when real money and real users are involved.Why you’ll love it here:You’ll own real parts of the product, not just ticketsThe UI has to be precise and trusted, not “close enough”You’ll work across the full stack with real influence over decisionsThe product sits between traditional finance expectations and onchain systemsYou’ll build for institutional and high net worth users who demand clarity and reliabilityWho this isn’t for: This isn’t a role for someone who wants a narrow remit, loose UI standards, or to ship features without thinking end to end.If you prefer clear tickets, minimal ownership, or letting AI do the thinking for you, this will feel uncomfortable.Day to day: You’ll be building and refining a production platform used to manage onchain assets.That means turning product direction and designs into polished, accurate UI, then wiring it properly into APIs, databases, and background workflows.The split is genuinely full stack. You’ll spend meaningful time on the frontend, but you’re also expected to contribute confidently on the backend so features are built end to end, not in isolation.Performance, maintainability, and correctness matter because this platform is already live and evolving.The Business: The business is a FinTech fund building onchain banking infrastructure for institutional capital.It operates where stablecoins, DeFi lending, automation, and risk management meet.The focus is usability and trust, bringing institutional-grade expectations into onchain finance, with active engagement from major financial institutions.Requirements:Strong full stack experience with React, Next.js, Node.js, and TypeScriptProven ability to ship precise, production-quality UISolid SQL knowledge with Postgres and an ORM such as PrismaExperience designing APIs and backend workflows, including orchestration tools like TemporalUnderstanding of ERC-4626 and DeFi lending markets such as Aave or MorphoConfident, structured use of LLM tools like Cursor or Claude CodeFinTech experience preferredAble to travel freely across EuropeIf you want ownership, technical breadth, and the chance to build a mature system people genuinely rely on, this is worth a conversation.