9fin 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. The team maintains a strong focus on impact, using technology to deliver value for the business. As 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 Clients Development 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. Python is the dominant backend language used Typing is used within our Python stack to power automated documentation and API definitions Relational Databases (PostgreSQL) at the heart of majority of services We 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 services Heavy use of AWS lambda Serverless Docker (AWS ECS) for uniform development/deployment from dev to prod Plan and reason about software effectively, clearly and compellingly communicating its purpose within systems and its business impact on clients Have hands-on experience designing data flow through software, from persistent storage to API endpoints, while applying industry best practices for validation Experience with Python and its web frameworks (we currently use FastAPI with strong typing & Pydantic) Strong working knowledge of SQL statements for retrieving data Code Quality: Through writing testable, maintainable code, and by engaging in code review for your own work and for reviewing others Experience in data modelling and with a pipeline orchestrator We also offer huge amounts of responsibility, an abundance of opportunity for growth and a platform to truly excel. Financial & Insurance Competitive Salary (our salary bands are benchmarked at the top end of the market) Pension (your minimum contributions are 4% with 9fin matching up to 7%) Private Medical Insurance Paid sick leave with Income Protection for long periods of illness Group Life Assurance Season Ticket Loan & Cycle to Work schemes 25 holiday days per year ~ Local 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 work ~ 1 month paid sabbatical after 5 years of service ~ Enhanced parental leave & flexible working arrangements available Training & Culture Professional learning and development budget Summer and Winter company social events At 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.
Engineer - back End Developer 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.
