Senior Underwriter US Casualty

Company: Rokstone Underwriting

Location: London

Posted: April 11th, 2026

Job Title: Senior Underwriter - US Casualty

Entity: Rokstone Underwriting

Department: Casualty

Location: London

Who We Are

Rokstone, part of the Aventum Group, is an established international underwriting MGA and approved Lloyd’s of London coverholder, where we also hold a Lloyd’s Box. With innovation at our core, we go beyond the ordinary to offer brokers specialised (re)insurance solutions. Within Rokstone, we house specialist MGAs such as Novus, iSure and iFarm, each contributing to our commitment to redefining industry standards.

At the heart of Aventum are our people. Working together in dynamic, service-focused teams, we prioritise our customers in everything we do. Collaboration fuels our success, courage drives our innovation, and continuous improvement keeps us ahead in a rapidly evolving industry. Our shared commitment is to revolutionise insurance for the better, one day at a time.

We also believe that investing in our people is investing in our future. By empowering people across the Group to develop their careers, advance within the Group, and embrace new challenges, we build an environment where growth and learning never stop.

Our competitive benefits package, offered via a flexible benefits platform, reflects this. Beyond core benefits, employees can tailor their benefits to meet their individual needs, supporting their unique goals and ambitions.

Role Summary

We are looking for a Senior Underwriter to join our dynamic and market-leading US Casualty team. This is more than a standard role; it’s an opportunity to be a critical member of a collaborative team that empowers you to challenge convention and drive new initiatives. We need a professional who thrives on combining strong technical skills with commercial initiative and a genuine passion for critical thinking. You will hold significant underwriting responsibility within our complex book, playing an instrumental role in its profitable growth by challenging assumptions and influencing our strategy with fresh ideas. Your established broker network and analytical mindset will be key to executing our goals and unlocking new opportunities in the US market

Role Accountabilities

Role Requirements

Skills and Abilities

Management Duties

We are an equal opportunity employer, and we are proud to share that 93% of our employees say they can be themselves at work. We aim to hire our industry's finest people because the best people drive the best outcomes. And we forever challenge the status quo because we know there are always ways to improve things. Because together, we're limitless.

We value applicants from all backgrounds and foster a culture of inclusivity. We understand the need for flexibility, so work in a hybrid model. Please let us know if you require any reasonable adjustments during the recruitment process.

FCA Conduct Rules

Under the Senior Managers and Certification Regime the FCA and Aventum expect that:

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