Frontend Engineer

London, England, United Kingdom

4/14/2025

About 9fin

The world's largest asset class, debt, operates with the worst data.

Technology has revolutionized equity markets with electronic trading, quant algos and instantaneous news. However, in debt capital markets, the picture is completely different. It still behaves like it’s in the 1980s; trillions of dollars of trades are placed over the phone, news is slow, and corporate credit information is imperfect and scattered.

Our mission is to change this.

9fin's proprietary technology delivers fast and comprehensive financial, credit, legal & ESG analysis. Our clients are able to make faster, more informed decisions, win more business and most importantly, save time.

Our fast growing list of clients include 9 of the top 10 Investment Banks, leading Asset Managers, Hedge Funds and Law Firms.

What you’ll work on

Every day is different, but here’s an example of the kind of things you’ll work on:

• As part of a cross functional team, contribute to and lead small-mid projects by defining and designing systems, building proof of concepts, and delivering new service functionality - including UX components, data visualisation and charting and application performance improvements and - while collaborating with Product, UX designers and Clients
• Craft code that meets high quality standards for style, maintainability, and best practices. Maintain and advocate for these standards throughout the engineering org through collaboration with other engineers and code review.
• Develop the internal and external facing web applications of the 9fin platform. Writing code to deliver new frontend functionality, consuming API’s, data routing/processing, automation and testing , as well as working with low-level DOM APIs to integrate external sources into our React applications, building bridges between static content from external sources and frontend components
• Explore and help to build an understanding to 9fin engineering of new technologies within our stack to lay the foundations for future features, products and developer experience improvements.
• Implement test automation from unit test level through to multiple component end-to-end level.
• Collaboration with product managers & UX designers to release code into production continuously using techniques such as feature flags to safely release incrementally to users.
• Participate in the planning, designing and building of new functionality and systems by autonomously creating quick proof of concepts to get fast and actionable feedback from the team & stakeholders.
• You will have the opportunity to contribute to building and maintaining our design system and component library. You will collaborate closely with design and product teams to ensure consistent, accessible, and scalable UI components that align with our brand and user experience standards.
• You'll have the ability to move between working on our client facing web application stack, internal web applications and tools for our ML/AI serving & development systems to create client value.
• Write high quality documentation and implement user & system metrics and observability as you go to continually learn, assess and improve 9fin’s platforms and products.
  
  

Our Frontend Stack

• React 18
• Typescript
• React query
• Jest, React Testing Library, Playwright
• Storybook
• Launch darkly feature flagging
• Next.js
• Vite
  
  

About You

This role will be a great fit if you:

• Experienced with React, modern ES6 and TypeScript to build web applications to own your code through code review to full release in collaboration with the team.
• Solid understanding of building and maintaining design systems, ensuring consistency and scalability. You understand the importance of keeping a design system flexible and up-to-date to meet evolving product needs, and you excel at collaborating with design teams to ensure alignment on component usage.
• Knowledgeable of core frontend concepts that power modern browser frameworks and how they interact with the DOM
• Plans and reasons effectively about your software with the ability to explore and understand it’s impact and where it fits into the 9fin systems
• Collaborates well with business colleagues, other engineers, UX Designers and Product managers to lead technical innovation to achieve fast delivery and frequent feedback iterations..
• Any experiences in backend development in any language (we primarily use python), cloud platforms, SQL database modelling, Dev-Ops practices and CI-CD pipelines would be beneficial but are not essential.
• Can identify tech debt and developer experience improvements and suggest frontend technical improvements and initiatives within your team and within guilds.
• Understand how data will pass through your software to the UX; from API requests to on-screen components and interactions, relating it back to company and engineering strategy.
• Can effectively implement software development best practices held by the team, including documentation, testing, code readability, and efficiency, in order to positively influence. team outcomes and promote a culture of excellence within the development process.
• Excited and willing to evaluate new technologies for the team by presenting proof-of-concepts that highlight their advantages and disadvantages and how they can be applied in a real world scenario at 9fin.
  
  

Our benefits

We’re a scaling start up and we enjoy sharing our success, when the company succeeds, we always reinvest that in our people. We also offer huge amounts of responsibility, an abundance of opportunity for growth and a platform to truly excel.

Uk Benefits

Financial & Insurance

• Competitive Salary(our salary bands are benchmarked at the top end of the market)
• Equity options
• Pension (your minimum contributions are 4% with 9fin matching up to 7%)
• Private Medical Insurance & Dental Insurance
• Paid sick leave with Income Protection for long periods of illness
• Group Life Assurance
• Season Ticket Loan & Cycle to Work schemes
  
  

Time off

• 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
• Work abroad for up to 3 months a year
• 1 month paid sabbatical after 5 years of service
• Enhanced parental leave & flexible working arrangements available
  
  

Training & Culture

• Professional learning and development budget
• Quarterly team socials
• Bi-annual engineering hackathons
• Summer and Winter company social events
• Travel & accommodation budget for social attendance if living far from london
  
  

9fin is an equal opportunities employer

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. If you’re excited about this role but your experience doesn’t perfectly align with the job description, we encourage you to apply anyway. You might just be who we’re looking for — either for this role, or perhaps another.