Senior Developer,Strategy & Technology Group

Company: AON

Location: London

Posted: April 30th, 2026

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. Aon is in the business of better decisions At Aon, we shape decisions for the better to protect and enrich the lives of people around the world. As an organization, we are united through trust as one inclusive team and we are passionate about helping our colleagues and clients succeed. 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. Youu2019ll 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 u2013 both technical and non-technical Problem solving u2013 digging into the why Adaptability u2013 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 #LI-JK1 #LI-HYBRID 2577611 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. Aon is in the business of better decisions At Aon, we shape decisions for the better to protect and enrich the lives of people around the world. As an organization, we are united through trust as one inclusive team and we are passionate about helping our colleagues and clients succeed. 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. Youu2019ll 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 u2013 both technical and non-technical Problem solving u2013 digging into the why Adaptability u2013 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 #LI-JK1 #LI-HYBRID
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