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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Full Stack Engineer - **Company:** TreasurySpring - **Location:** London, UK - **Experience:** Expert - **Contract:** Temporary contract - **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, User Authentication, Code Coverage, Code Review, Databases, Relational Databases, Python (Programming Language), Operational Databases, Software Construction, Software Engineering, TypeScript, ReactJS, Backend, Data Layers, Front End Software Development, Legacy Systems - **Published:** August 3, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=8da92078e65b79e5 ## About the Role * Strong professional experience with Python, React and TypeScript. * A track record of designing, building and shipping substantial customer-facing products across frontend, backend and data layers. * Strong web and server-side engineering fundamentals, including component design, state management, APIs, relational databases, authentication and permissions. * The ability to quickly understand unfamiliar systems and confidently trace behaviour across application, service and database boundaries. * Exceptional customer empathy. You naturally put yourself in the customer's shoes, seek to understand their workflows, goals and pain points, and use those insights to build products that genuinely solve customer problems. * Strong product judgement. You enjoy taking ambiguous problems, identifying the underlying customer need, exploring different approaches and making thoughtful trade-offs between speed, simplicity and long-term maintainability. * You treat AI as a force multiplier, not a replacement for engineering judgement. You know when to trust AI, when to challenge it and when to replace its output entirely. * Strong test-first mindset with a commitment to developer-led QA - you'll take end-to-end ownership of your code's quality, test coverage, and reliability without relying on a separate QA team. * Curiosity and a desire to continuously learn. Technology is changing rapidly and you're excited to explore new tools, techniques and ways of working. * Clear written and verbal communication skills, with a collaborative, low-ego approach to feedback, design discussions and code review. ## Description The role: Senior Full Stack Engineer We're looking for a Senior Full Stack Engineer to help redefine how institutions manage cash. You'll build software that replaces manual treasury processes and legacy infrastructure with intuitive products used by leading investors, corporations and financial institutions. You'll own customer problems end to end, from understanding the workflow through to designing, building, shipping and improving the solution. You should already be comfortable working with Python, React and TypeScript. You may have strengths in one area, but you'll be expected to contribute across the stack and become increasingly full-stack over time. You'll work directly with Product, Design, customers and domain experts to understand customer needs, shape the right solution and measure its impact after release, not simply implement completed designs or pre-defined tickets. AI is fundamental to how we build software. We expect engineers to orchestrate coding agents, rapidly prototype ideas, automate repetitive work and continually evolve their engineering workflow as the technology advances. AI should increase your leverage, not replace your judgement. You remain accountable for everything that reaches production. What you'll do: Responsibilities * Build and ship high-quality features across our React, TypeScript and Python stack, taking ownership from discovery through to production and continuous improvement. * Help reimagine how modern institutional treasury works by replacing manual processes and legacy systems with intuitive software. * Work directly with customers to understand their workflows, pain points and goals, using those insights to shape product and technical decisions. * Collaborate closely with Product, Design and domain experts to turn ambiguous problems into elegant, well-engineered solutions. * Bring your own product judgement. Prototype ideas, challenge assumptions, identify awkward user experiences and proactively propose simpler, better solutions. * Use AI as a core part of your engineering workflow, orchestrating coding agents and modern AI tools to solve problems faster, automate repetitive work and unlock entirely new ways of building software. * Deliver quickly through small, iterative releases, using customer feedback and production data to continuously improve what you've built. * Continuously improve our products, engineering practices and internal tooling by identifying opportunities to simplify, automate and increase engineering leverage. * Collaborate in a low-ego, high-trust team where curiosity, ownership and continuous learning are expected. ## Related Videos - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Kubernetes and Microservices with Multi-Model Databases](https://www.wearedevelopers.com/videos/382-kubernetes-and-microservices-with-multi-model-databases) - [Inside Bitpanda's Tech Stack: Scaling a European Fintech Leader - Markus Dorner](https://www.wearedevelopers.com/videos/1979-inside-bitpanda-s-tech-stack-scaling-a-european-fintech-leader-markus-dorner) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Nest.js - TypeScript in the backend can also be clean](https://www.wearedevelopers.com/videos/1033-nest-js-typescript-in-the-backend-can-also-be-clean) ## Related Articles - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk) - [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers)