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Senior Product Engineer

9fin· Engineering
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LondonFull-timePosted 11mo ago

About the role

Senior IC engineer role focused on backend services and web tools within 9fin's platform, leading system design, mentoring colleagues, and delivering new services and APIs in a hybrid London-based environment.

Responsibilities

  • 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.
  • Continually improve the 9fin codebase taking the chance to automate, refactor and document when it’s most impactful..
  • 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.
  • Collaboration and teamwork: Cross functional teams are formed for all projects including the appropriate domain expertise from 9fin financial, legal and editorial colleagues.
  • Your ability to explain and break down complex projects to non technical audiences will enable productive and efficient team progress.
  • Developer Experience: Through managed automated preview environments, feature flags and well maintained non production environments. You will be able to move with velocity and get feedback and iterate quickly.

Qualifications

  • 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.

Skills

Required:Senior IC engineeringBackend developmentFrontend development
Nice to have:AI-assisted development tools

Benefits

  • Competitive Salary (top end of market)
  • Equity options
  • Pension (minimum contributions 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 exchange options)
  • Work abroad for up to 3 months a year
  • 1 month paid sabbatical after 5 years of service
  • Enhanced parental leave & flexible working arrangements enabled
  • Professional learning and development budget
  • Quarterly team socials
  • Summer and Winter company social events
Last updated Oct 21, 2026. Interested? Apply on the company site.
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About 9fin

Faster, smarter, debt market intelligence

9fin is a leading provider of debt market intelligence and offers everything you need to analyse a credit, or win a mandate in one AI-powered platform

Debt Market IntelligenceDataAnalyticsCredit AnalysisFinancial Data
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