About 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.With proven product-market fit and strong, global market pull, 9fin is accelerating toward becoming the category-defining platform for debt markets worldwide.What you'll work onAs part of a cross functional team, lead projects by defining and designing systems, building proof of concepts, and delivering new service functionality - including APIs, data processing and automation - while collaborating with Product and ClientsDevelopment and engineering primarily on the backend services and web application hosted tools and systems of the 9fin platform.Play an impactful role within project teams as a senior IC, running code reviews, mentoring other developers, leadership & involvement in early research and experimentation with new technologies providing input for new features and products.Very diverse web platforms, from complex financial data modelling, complex access control business logic, capturing environmental, emission, energy data, incorporation of ML/AI prediction services, data visualisation serving and automation systems.Cross functional teams are formed for all projects including the appropriate domain expertise from 9fin financial, legal and editorial colleagues. This allows the best quality information and feedback to go directly to engineering project teams. Your ability to explain and break down complex projects to non technical audiences will enable productive and efficient team progress.Our StackPython is the dominant backend language usedFlask & FastAPIReact & TypeScriptTyping is used within our Python stack to power automated documentation and API definitionsRelational Databases (PostgreSQL) at the heart of majority of servicesWe have our own internal developer platform with standardised paved road approaches to infrastructure to bring your code into production as quickly as possible.We're AWS for Cloud hosted servicesHeavy use of AWS lambda ServerlessDocker (AWS ECS) for uniform development/deployment from dev to prodRequirementsThis role will be a great fit if you:Have experience operating as a Senior IC Engineer, leading systems design and infrastructure discussions, mentoring more junior team members, and scoping work within cross-functional product teams.Comfortable moving between frontend and backend work, picking the right tool for the problem rather than specializing in one area.Strong knowledge of modern JavaScript/TypeScript and frameworks such as React, alongside experience building scalable backend services and APIs.Comfortable leveraging modern AI-assisted development tools (e.g. Cursor, Claude, ChatGPT, GitHub Copilot) to improve productivity while maintaining high engineering quality.A strong product mindset with an eye for user experience, working closely with designers and product managers to craft intuitive, polished interfaces.Able to independently own features from idea through design, implementation, deployment and iteration.Strong system design and problem-solving skills, balancing speed with long-term maintainability.We also offer huge amounts of responsibility, an abundance of opportunity for growth and a platform to truly excel.Financial & InsuranceCompetitive Salary (our salary bands are benchmarked at the top end of the market)Equity optionsPension (your minimum contributions are 4% with 9fin matching up to 7%)Private Medical InsurancePaid sick leave with Income Protection for long periods of illnessGroup Life AssuranceSeason Ticket Loan & Cycle to Work schemesTime off25 holiday days per yearLocal public holidays (with the ability to exchange them for alternative days)Hybrid working model, to allow you the flexibility to decide how, where and when you do your best workWork abroad for up to 3 months a year1 month paid sabbatical after 5 years of serviceEnhanced parental leave & flexible working arrangements availableTraining & CultureProfessional learning and development budgetQuarterly team socialsSummer and Winter company social events9fin is an equal opportunities employerAt 9fin we are dedicated to building and promoting a fair and inclusive workplace where everyone can reach their full potential and truly belong. We recognize that building diverse teams enables a more creative and productive environment.
Design Engineer & Senior Engineer in London employer: 9fin
9fin is an exceptional employer located in Greater London, offering a dynamic work culture that fosters innovation and collaboration. With a focus on employee growth, the company provides competitive salaries, private medical insurance, and the flexibility of hybrid working arrangements, including opportunities for international work. Join us to be part of a forward-thinking team dedicated to delivering high-quality data solutions.
