9fin

Senior Backend Engineer

9fin
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6 months ago
London, United KingdomSenior

Responsibilities

  • Lead cross-functional projects by defining and designing systems, building proofs of concept, and delivering APIs, data processing, automation, and new service functionality.
  • Develop and maintain backend services, web applications, hosted tools, and systems for the 9fin platform.
  • Serve as a senior individual contributor by leading systems design and infrastructure discussions, running code reviews, mentoring developers, and contributing to research and experimentation.
  • Improve the codebase through automation, refactoring, documentation, and testable and maintainable implementation.
  • Design data flows from persistent storage through API endpoints with appropriate validation and industry practices.
  • Collaborate with Product, Clients, financial, legal, editorial, and engineering colleagues to deliver projects and explain complex technical work.
  • Contribute to developer experience through managed preview environments, feature flags, and maintained non-production environments.

Requirements

  • Experience operating as a senior individual-contributor engineer, including systems design, infrastructure discussions, mentoring, and work scoping within cross-functional product teams.
  • Ability to plan and reason about software clearly and communicate its purpose and business impact.
  • Hands-on experience designing data flows from persistent storage to API endpoints and applying validation best practices.
  • Experience with Python and web frameworks, particularly FastAPI, strong typing, and Pydantic.
  • Strong experience delivering APIs and working with service-oriented architecture.
  • Strong working knowledge of SQL statements for retrieving data.
  • Strong collaboration and communication skills with engineering and cross-functional colleagues.
  • Experience writing testable, maintainable code and participating in code reviews.
  • Experience with data modeling and a pipeline orchestrator is preferred.

Benefits

  • Competitive salary, equity options, pension contributions with employer matching up to 7%, private medical insurance, paid sick leave with income protection, and group life assurance.
  • Season Ticket Loan and Cycle to Work schemes.
  • 25 holiday days per year plus local public holidays, with the option to exchange holidays for alternative days.
  • Hybrid working model with flexibility over where, when, and how to work.
  • Ability to work abroad for up to 3 months per year.
  • One month of paid sabbatical after 5 years of service.
  • Enhanced parental leave and flexible working arrangements.
  • Professional learning and development budget and company social events.
  • 9fin is an equal opportunities employer committed to a fair and inclusive workplace.

Tech Stack

Categories

9fin

About 9fin

501-1,000 employees
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