Backend Engineer

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.

We’re at a defining inflection point. 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 onThis role is the opportunity to take on the technical leadership on projects, defining and designing systems, making quick proof of concepts and working closely with Product and our Clients.

Write code and lead others in the team in delivering new service functionality, implementing API’s, data routing/processing and automation mechanisms.

Development and engineering primarily on the backend services and web application hosted tools and systems of the 9fin platform.

Taking a leading role within project teams as an IC, running code reviews and mentoring of junior developers, involvement in early research and experimentation with new technologies providing input for new features and products.

Continually improve on the 9fin codebase taking the chance to automate, refactor and document when you can.

Variety:
Our web platforms are incredibly diverse, from complex financial data modelling, 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. 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.

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.

Our Backend Stack Python is the dominant backend language used Flask&FastAPITyping is used within our Python stack to power automated documentation and API definitions

Relational Databases (PostgreSQL) at the heart of majority of services

We’re AWS for Cloud hosted services

Heavy use of AWS lambda Serverless Docker (AWS ECS) for uniform development/deployment from dev to prod

Requirements

This role will be a great fit if you:

Can effectively plan and reason about your software, understanding where it fits into systems and the overall business

Can think about how data will pass through your software; from persistent storage through to API endpoint

Experience with Python and its web frameworks (we currently use Flask, and are moving to FastAPI with Typing)
Strong experience delivering APIs, Service Oriented Architecture Good working knowledge of SQL statements for retrieving dataA good collaborator and communicator with cross functional engineering teammates and others within 9finCode Quality:
Through writing testable, maintainable code, and by engaging in code review for your own work and for reviewing others

Company 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.

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…