Assistant Underwriter - US Casualty

Arthur; London; Hybrid; GBP 30,000 - 45,000; Full time

Job summary

A leading specialty insurer seeks an Assistant Underwriter for their US Casualty team in London. This role offers an opportunity to support underwriting tasks in a growing book, ensuring smooth operations while working closely with senior underwriting leaders. Successful candidates will have a chance to grow professionally with mentorship and strong progression opportunities.

Benefits

Mentorship from senior market professionals

Strong progression opportunities

Collaborative, entrepreneurial culture

Qualifications

• Previous experience as an Assistant Underwriter or Underwriting Analyst (US Casualty preferred).
• Familiarity with casualty classes of business (especially excess & umbrella) is highly advantageous.

Responsibilities

• Support underwriting tasks including account pricing, rating, and documentation.
• Liaise with brokers and internal stakeholders to ensure timely processing of quotes.
• Assist in the development and refinement of underwriting guidelines.

Skills

Organizational Skills

Communication Skills

Analytical Mindset

Attention to Detail

Job description

Job Title: Assistant Underwriter – US Casualty (Umbrella & Excess)
Location: London (Hybrid Working Available)
Salary: Competitive + Benefits

Join a Growing Team in a High-Impact Role
On behalf of a dynamic and rapidly growing specialty insurer, we are seeking an Assistant Underwriter to join the US Casualty team, supporting a high-profile Group Head and Senior Underwriter as they build out a new and exciting portfolio. This is a rare opportunity to be part of a developing book from the ground up, with meaningful exposure to strategy, pricing, and underwriting processes.

The Opportunity This newly launched US Casualty Umbrella and Excess and is expected to grow significantly. The role offers you the chance to work in a leader-follow model, where the team prices and rates accounts but currently operates without a dedicated claims team—relying instead on third-party insights.
You'll support underwriting across a diverse range of sectors, including:

• Product Liability
• Rail
• Construction
• Premises & Operations

As part of a close-knit and collaborative structure reporting into the Operations team, you’ll work alongside both the Group Head of US Casualty and a Senior Underwriter to ensure smooth operational execution while gaining exposure to high-level decision-making.
Key Responsibilities

• Support underwriting tasks including account pricing, rating, and documentation
• Liaise with brokers and internal stakeholders to ensure timely processing of quotes and binders
• Maintain underwriting files and assist with data analysis/reporting
• Contribute to the smooth running of day-to-day operations
• Assist in the development and refinement of underwriting guidelines as the book matures

About You

• Previous experience in a similar Assistant Underwriter or Underwriting Analyst role (US Casualty preferred)
• Strong organizational and communication skills
• Analytical mindset with attention to detail
• Eagerness to be part of a developing team and learn from senior underwriting leaders
• Familiarity with casualty classes of business (especially excess & umbrella) is highly advantageous

Why Apply?

• Be part of a growing, high-profile book at an early stage
• Mentorship from senior market professionals
• Strong progression opportunities as the book and team expand
• Collaborative, entrepreneurial culture

Apply now to be considered for this unique Assistant Underwriter opportunity in US Casualty, and take the next step in your insurance career.