You will lead the security posture for an AI-driven platform trusted by the world’s elite law firms and corporations. Balancing governance and technical execution, you’ll maintain ISO/SOC compliance, secure LLM-enabled product features, and scale internal IT operations. This is a high-impact role securing sensitive data for 150+ global enterprise customers.
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Senior Information Security Officer at Definely
As the Senior Information Security Officer, you will own the security posture for a platform trusted by Magic Circle firms, leading ISO/SOC compliance and securing cutting-edge AI features. This London-based hybrid role offers a rare chance to shape security standards for LLM-enabled products while enjoying a competitive £65K–£85K salary, equity, and a performance bonus up to 16%. If you're a security leader ready to scale with a fast-growing category leader, this is your next career-defining move.
About this role
Role overview
About the company
Definely
Definely is an AI-powered LegalTech company that provides a suite of tools to help corporate and private practice lawyers draft, review, and manage complex contracts more efficiently, primarily within Microsoft Word. Its products streamline the creation, editing, and quality-checking of legal documents by keeping lawyers in their natural workflow while enabling fast navigation across definitions, references, and clauses. Originally designed to make legal documents more accessible for visually impaired professionals, Definely has evolved into a broader drafting, reviewing, and knowledge platform used by in-house legal teams and law firms globally. The product suite includes features such as contextual editing, clause insertion and reuse via a knowledge repository (Vault), and AI-assisted drafting and review (Enhance and Draft). Definely aims to reduce review time, standardize document quality, mitigate legal and operational risk, and simplify how legal teams understand and work with complex information. The company is a fast-growing, Series B–stage scale-up headquartered in the UK and focuses on transforming the global legal services market through AI-driven document workflows.
What you'll do
What you will do
- Own and evolve the Information Security Management System (ISMS) while leading ISO 27001 and SOC 2 Type II audits.
- Partner with engineering to embed secure SDLC practices, performing threat modeling and design reviews for AI-driven product features.
- Manage company-wide risk assessments, vendor security reviews, and day-to-day IT operations including device management and onboarding.
Who you are
Who this is a fit for
- Proven experience securing SaaS products, including a strong track record of delivering ISO 27001 or SOC 2 certifications.
- Technical expertise in cloud security (Azure or AWS) and a deep understanding of securing LLM-based systems and AI applications.
- Strong background in IT operations and identity management, holding certifications such as CISSP, CISM, or ISO 27001 Lead Auditor.
Why this role
Why this role is remarkable
- Shape the security strategy of a category-defining AI platform backed by top-tier investors like Microsoft and Octopus Ventures.
- Direct influence over AI/LLM security standards as you lead the transition toward ISO/IEC 42001 certification.
- Exceptional benefits package including a 16% performance bonus, equity, private healthcare, and a flexible "work from anywhere" month.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Meet Jack
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
How does this work?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If it’s a match and the company wants to meet you, they’ll make the intro. In the meantime, if you’d like, Jack will send you excellent alternatives.