Convex Insurance

Specialty insurer for complex risks

Senior Portfolio Actuary

Actuarial & Risk ModellingUpdated on Nov 13

Full-timeLondon, UKNo salary listedIn-person

About the Job

Requirements

Qualified Actuary (FIA / FFA or equivalent) with 6+ years of actuarial pricing or portfolio management experience in commercial insurance or reinsurance lines in the London market or US market.
Subject-matter expertise and product knowledge of Casualty and/or Financial Lines.
Solid technical experience with core actuarial concepts and methodologies relevant to Casualty and Financial Lines.
Ability to influence senior underwriters while maintaining a collaborative, partnership-first approach, and anticipate stakeholder needs.
Ability to translate complex technical actuarial concepts into concise, high-impact written and verbal insights for non-technical stakeholders.
Ability to share workload, foster open communication with peers, and identify how colleagues’ strengths complement one’s own.
Investigative mindset and desire to examine data in depth.
Desire to take on mentorship responsibilities and collective responsibility for the team’s overall success.

Responsibilities

Work with underwriters to design and manage net portfolios across Casualty and Financial Lines, balancing risk and return to support long-term sustainable growth.
Partner with Ceded Re, Exposure Management, Capital, and Reserving teams.
Link portfolio and underwriting strategy to business planning and reserving cycles, ensuring insights shape and align with targets and reserving views.
Contribute to the design and enhancement of portfolio optimization frameworks to support strategic, underwriting, and analytics decisions.
Partner with underwriters on pricing, structuring, and evaluating large, complex, or non-standard transactions that materially affect portfolio performance.
Lead the design, specification, and parameterization of pricing models, dashboards, and decision tools with Actuarial and Underwriting functions.
Support development of pricing and benchmarking capabilities focused on key risk attributes for live negotiations and validation of portfolio intentions.
Partner with junior and senior underwriters, providing constructive challenge and data-led insight to influence underwriting strategy.
Work with underwriters to identify and evaluate new business, product launches, class extensions, and emerging coverage propositions to support disciplined, profitable portfolio growth.
Support and drive multidisciplinary engagement across Analytics, Actuarial, and Underwriting.
Mentor junior members of the Portfolio Insights team and support the broader team in shaping its culture.
Deliver regular portfolio reviews with Underwriting at segment/client and market levels to identify emerging trends, loss drivers, and relevant market dynamics in Casualty and Financial Lines and other lines as needed.
Engage underwriting leadership to review open-market and delegated performance, translating analytical insights into actionable underwriting guidance.
Feed portfolio review findings to Reserving and Capital teams to inform forward-looking profitability views.
Champion data literacy and adoption of analytical tools across the underwriting community.
Evaluate emerging data sources, analytics techniques, and visualization tools to surface insights accurately and efficiently.
Support other Property and Specialty lines as needed.

The Portfolio Insights team operates as a core strategic partner to Convex's Insurance and Reinsurance divisions across our London and US operations. Covering over $6.5bn in GWP, we deliver data-driven portfolio insights, relative risk assessment, and strategic recommendations to maximize value across complex commercial lines.

What You’ll Be Doing
As a Senior Portfolio Actuary focusing on Casualty and Financial lines, you will work closely with underwriting functions, generating portfolio insights to support portfolio management and product development across a highly diverse, multi-geography product suite in London and the US. You will be integral to the commercial strategy for Casualty and Financial Lines, together with experts in ceded reinsurance, exposure management, actuarial, capital, and innovation to build highly resilient, long-term net portfolios, design pricing models, and bridge the gap between technical actuarial science and commercial decision-making. You will also be required to support on other Property & Specialty lines from time to time.

Strategic Portfolio Design & Optimisation

Work with Underwriters to strategically design and manage net portfolios across Casualty and Financial Lines to ensure long-term, sustainable growth, effectively balancing risk and return through the cycle.
Alongside Underwriting, partner cross-functionally with Ceded Re, Exposure Management, Capital, and Reserving teams
Link portfolio and underwriting strategy directly into business planning and reserving cycles, ensuring underlying insights actively shape (and are consistent with) top-down targets and reserving views.
Contribute to the design and enhancement of portfolio optimisation frameworks to unlock strategic value and drive underwriting and analytics decisions across Convex.

Risk Benchmarking & Pricing

Partner with underwriters on bespoke pricing, structuring, and evaluation of large, complex, or non-standard transactions that have a material impact on portfolio performance.
Lead the design, specification, and parameterization of pricing models, dashboards, and associated decision tools in partnership with the broader Actuarial and Underwriting functions.
Support the development of pricing and benchmarking capabilities, focusing on key risk attributes to assist underwriters’ live negotiations and serve as a robust sense check against initial portfolio intentions.

Embedded Support & Business Partnering

Act as a dedicated partner to junior and senior Underwriters, providing constructive challenge and data-led insight to help influence underwriting strategy.
Work with underwriters to identify and evaluate new business and product launches, class extensions, and emerging coverage propositions to support disciplined, profitable portfolio growth.
Support and drive Convex’s multi-disciplinary engagement model, fostering open communication and active collaboration across Analytics, Actuarial, and Underwriting.

Team Support & Management

Mentor junior members of the Portfolio Insights team
Support the broader Portfolio Insights team, helping to shape our culture.

Portfolio Reviews

Deliver regular portfolio reviews with Underwriting at both micro (segment/client) and macro (market) levels to uncover emerging trends, loss drivers, and market dynamics relevant to Casualty and Financial Lines (or others).
Engage with underwriting leadership to review open market and delegated performance, translating analytical insights into clear, actionable underwriting guidance.
Feed portfolio review findings directly into Reserving and Capital teams to inform forward-looking profitability views.

Analytics Modernisation & Data Culture

Champion data literacy and the business adoption of analytical tools across the underwriting community.
Evaluate emerging data sources, analytics techniques, and visualization tools to surface insights quickly, cleanly, and accurately.

Qualified Actuary (FIA / FFA or equivalent) with 6+ years of actuarial pricing or portfolio management experience in commercial insurance or reinsurance lines in the London market or US market.
SME- and product-knowledge of Casualty and/or Financial Lines
Solid technical experience with core actuarial concepts and methodologies relevant to Casualty and Financial lines.
Excellent influencing skills, with an aptitude for anticipating stakeholder needs and thinking about the right ways to provide support; proven track record of influencing (senior) underwriters while maintaining a collaborative, partnership-first approach.
Communicating with impact: exceptional ability to translate complex technical actuarial concepts into concise, high-impact insights for non-technical stakeholders (both written and verbal).
Collaborative nature: an ability to share workload and foster open communication with your peers across Convex, as well as identifying other people’s strengths and how they complement your own.
Intellectual curiosity: an investigative mindset and desire to dig beneath and beyond the numbers.
Desire to take on mentorship responsibilities and collective responsibilities for the overall team’s success.

About the Company

Convex Insurance

Specialty insurer for complex risks

Convex Group is an international specialty insurer and reinsurer that focuses on complex risks for large commercial clients. It underwrites a broad range of lines—property, casualty, and specialty areas such as aerospace, energy, marine, and financial lines—through direct underwriting and reinsurance, supported by a modern tech platform and outsourced operations to keep its underwriters focused. Led by veterans from Catlin and XL Catlin, it uses a legacy-free model and a partnership-based approach centered on fairness, transparency, and strong claims service. Its goal is to deliver expert underwriting for complex risks, maintain solid financial strength, and grow its global specialty insurance and reinsurance business, including the Lloyd’s Syndicate 1984 launched in 2025.

Company size: 501-1,000
Company stage: Growth Equity (Non-Venture Capital)
Total funding: $3.2B
Headquarters: London, United Kingdom
Founded: 2019

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