Senior Developer

Company: Aon Corporation
Apply for the Senior Developer
Location: London
Job Description:

Senior Web Developer

Are you looking for a role where you can own architecture and not just tickets?

Do you want to build mission‑critical modelling software used by leading insurers?

This is a hybrid role with the flexibility to work both virtually and from our London office.

What the day will look like

Your days will be varied but will likely include:

  • Working on developing our product by writing code, testing, debugging, analysing, reviewing and all other aspects of the software development lifecycle
  • Working with other developers, actuaries, devops and other teams to ensure successful delivery of software
  • Providing support to both internal and external stakeholders
  • Supporting and potentially leading product deployments
  • Contributing to architecture, process and quality improvement discussions
  • Engaging in ongoing professional development

How this opportunity is different

This role is a fantastic opportunity to work with modern technology, including .NET 10, to shape the next generation of our product. You’ll join a tight‑knit, highly collaborative team where your ideas are heard and you have real ownership from day one.

Skills and experience that will lead to success

  • Strong communication – both technical and non‑technical
  • Problem solving – digging into the why
  • Adaptability – open to new tech as the stack evolves
  • NET Backend web development
  • SQL Server / Azure SQL
  • Unit testing, e.g. xUnit
  • Security & authentication

Good to have

  • Experience leading or guiding junior colleagues
  • Containerised application development
  • Cloud (Azure or equivalent)
  • Scalable deployment experience
  • Modern UI web framework experience (Angular or equivalent)
  • Distributed message queue
  • System / E2E testing

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Posted: April 30th, 2026