Security Analyst - Up to £450 per day Client Opportunities · London Office, London - External ·

Security Analyst - Up to £450 per day

3 months contract (Inside IR35)

2 Days Per Week Onsite (Office located near Holborn Underground Station)

Overview

We are seeking an enthusiastic and proactive Security Analyst to join a busy internal IT and Security function on an initial 3-month contract. This role is ideal for someone with strong email security experience who enjoys working directly with users, investigating threats, and helping to maintain a secure working environment.

The successful candidate will play a key role in protecting the business from email-based threats, managing security incidents, and supporting end users with security-related queries. You'll be heavily involved in phishing investigations, email validation, message release requests and security alert triage using industry-leading tools including Mimecast, Microsoft Defender, and Freshservice.

This is a highly visible role requiring strong communication skills, attention to detail, and a customer-focused approach. The ideal candidate will be comfortable engaging with stakeholders across the business and helping users understand security risks in a clear and professional manner.

Key Responsibilities

• Investigate, analyse and respond to suspected phishing and malicious emails.
• Review reported emails and determine whether communications are legitimate or represent a security threat.
• Manage email quarantine and release requests through Mimecast.
• Monitor and respond to security alerts generated within Microsoft Defender.
• Triage and manage security incidents and requests through Freshservice.
• Escalate confirmed threats and incidents following established security procedures.
• Identify trends in phishing attacks, spam campaigns and social engineering attempts.
• Block malicious senders, domains and email threats where appropriate.
• Support end users with security-related concerns and provide guidance on best practice.
• Maintain accurate records of investigations, actions taken and incident outcomes.
• Work closely with IT and Security teams to continuously improve email security processes.
• Assist with security reporting and provide updates on threat activity and incident trends.

Required Skills & Experience

• Previous experience working as a Security Analyst, SOC Analyst, Information Security Analyst, or similar.
• Hands-on experience with Mimecast, including quarantine management and email release processes.
• Experience using Microsoft Defender and associated security tooling.
• Experience working with Freshservice or a similar ITSM/ticket management platform.
• Strong understanding of phishing attacks, email security threats and social engineering techniques.
• Ability to investigate and assess security risks quickly and accurately.
• Excellent communication and stakeholder engagement skills.
• Strong analytical and problem-solving abilities.
• High attention to detail and a methodical approach to investigations.
• Ability to work independently and manage workload effectively within a part-time contract.

Desirable Experience

• Experience within a legal, corporate, financial services or professional services environment.
• Knowledge of Microsoft 365 security and administration.
• Understanding of incident response procedures and security operations.
• Familiarity with email authentication technologies such as SPF, DKIM and DMARC.
• Exposure to endpoint security and threat detection platforms.

Personal Attributes

• Approachable, outgoing and personable.
• Strong customer service mindset.
• Excellent verbal and written communication skills.
• Naturally inquisitive with a keen eye for detail.
• Confident communicating with both technical and non-technical stakeholders.
• Proactive and able to take ownership of investigations and incidents.
• Team player with a collaborative working style.