Senior Platform Engineer - Developer Experience

Senior Platform Engineer - Developer Experience LocationLondonEmployment TypeFull timeLocation TypeHybridDepartmentEngineeringAbout 9fin9fin is the AI platform powering global debt markets — the world’s largest asset class at over $145 trillion.Debt markets are vast, global, and mission-critical, yet still run on fragmented data, PDFs, and manual workflows. 9fin replaces this broken infrastructure with a single platform that centralises proprietary credit data, deep analysis, and high-value workflows across global markets.Today, 9fin powers teams at 300+ blue-chip institutions worldwide, including global banks, asset managers, private equity firms, law firms, and advisors. The business is scaling at exceptional speed, with rapid expansion in the US and best-in-class retention driven by deep workflow adoption.We’re at a defining inflection point. With proven product-market fit and strong, global market pull, 9fin is accelerating toward becoming the category-defining platform for debt markets worldwide.The opportunityWe are looking for a Senior Developer Experience Engineer to help make software development at 9fin faster, simpler and safer.This is a software engineering role focused on the tools, systems and paved roads that other engineers use. You will work across the software development lifecycle, from creating a new service through to testing, deployment, observability and operating it in production.You will join an established Platform team and work alongside our existing Developer Experience Engineer. You will speak directly with engineers, understand where they are losing time or carrying unnecessary complexity, and build solutions that teams want to adopt.Your customers are 9fin's software engineers. You will have the autonomy to solve problems that help them build products quickly, securely and to a high standard of quality.The goal is not to centralise every engineering decision within Platform. It is to give teams sensible defaults, effective self-service tools and a clear path to production.What you'll work onEvery day is different, but here are examples of the kind of things you’ll work on:Building and maintaining internal tools, services, APIs and command-line applications.Improving workflows across coding, testing, code review, deployment and production operations.Creating service templates and paved roads that make it easier to build secure, observable and reliable software.Improving the speed, reliability and usability of our CI/CD systems.Developing reusable platform capabilities that product engineers can consume through self-service.Helping engineers use observability effectively, with good defaults for logs, metrics, traces and service-level indicators.Working directly with engineers to understand friction, test ideas and support adoption.Using feedback and workflow data to measure whether changes have improved the developer experience.Contributing production-quality code, tests, documentation and operational support.About youThis role will be a great fit if:You are a strong software engineer with experience designing, building, testing and operating production software.You are proficient in at least one modern programming language. We care more about engineering fundamentals than a particular language.You understand the software development lifecycle and have practical experience improving how software is built, tested, deployed or operated.You have strong opinions about what makes software development effective, while remaining pragmatic about different teams and contexts.You can design maintainable systems and make sensible trade-offs between speed, quality and complexity.You have experience with CI/CD, containers and cloud infrastructure.You enjoy building tools and platforms for other engineers.You take a product approach to internal tooling: understanding user needs, validating solutions and measuring adoption.You can independently own a problem from discovery through to delivery and adoption.You...