Freelance Cybersecurity Specialists in London

Freelance Cybersecurity Specialists in LondonFreelance Cybersecurity Specialists in London

Projects People

proCopthorne, UK

Cyber expert specialising in Azure Security Services.

$10k+: Earned

4x: Hired

5.0: Rating

22: Followers

Cyber expert specialising in Azure Security Services.

Cover image for Microsoft Sentinel & Splunk ES Engineer for up to 6 months

Microsoft Sentinel & Splunk ES Engineer for up to 6 months

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13

Cover image for Extended Interview Process for CrowdStrike SIEM Specialist

Extended Interview Process for CrowdStrike SIEM Specialist

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12

Cover image for Setting up and optimising Microsoft Sentinel

Setting up and optimising Microsoft Sentinel

1

51

Cover image for Configure SIEM Security Operation using Microsoft Sentinel

Configure SIEM Security Operation using Microsoft Sentinel

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41

Cybersecurity Specialist(7)

Design Partner for B2B SaaS, Cybersecurity & Defense

32: Followers

expert

Design Partner for B2B SaaS, Cybersecurity & Defense

Cover image for Cybersecurity hero concept

Cybersecurity hero concept

2

3

169

Cover image for Infrastructure security hero concept [alternative version]

Infrastructure security hero concept [alternative version]

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20

321

Cover image for Infrastructure security hero concept

Infrastructure security hero concept

4

3

139

Cover image for Hero concept for a fictional

Hero concept for a fictional critical infrastructure and DDoS mitigation company, exploring how a security firm can look credible and modern when its website is the main thing buyers judge it on

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116

Cybersecurity Specialist(8)

Amatullah Campbell

Cybersecurity GRC Consultant | Ex-Accenture

7: Followers

Cybersecurity GRC Consultant | Ex-Accenture

Cover image for Business Analyst for a Government

Business Analyst for a Government client on behalf of Accenture. Supported the delivery of a data warehouse programme aimed at centralising data, improving reporting capabilities and enabling data-driven decision-making across multiple departments. Worked closely with business and technical stakeholders to define data requirements and ensure alignment with strategic objectives. My duties included the following: ▪ Led requirement gathering activities to capture data, reporting, and analytics needs through stakeholder interviews, workshops, and process analysis. ▪ Facilitated workshops with business users, data engineers and architects to define data sources, data flows and reporting requirements. ▪ Produced detailed documentation including business requirements documents (BRDs), data requirements, data mapping specifications, and user stories. ▪ Collaborated with technical teams to translate business needs into data models, ensuring clarity on data definitions, transformations, and quality rules. ▪ Translated business needs into structured user stories and acceptance criteria, supporting agile delivery and ensuring traceability from requirements through to implementation. ▪ Managed RAID logs and supported programme governance by tracking risks, dependencies, and data-related issues. ▪ Supported UAT by defining acceptance criteria, validating outputs, and ensuring delivered data aligned with business expectations. Key outcomes included: Key outcomes included: ▪ Delivered clearly defined data and reporting requirements, enabling the successful design and implementation of the data warehouse. ▪ Improved data consistency and trust by standardising data definitions and aligning stakeholders on a single source of truth. ▪ Strengthened delivery alignment by linking use cases and user stories directly to technical outputs, reducing ambiguity and rework.

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236

Cover image for Cybersecurity Project Manager for a

Cybersecurity Project Manager for a UK Government client on behalf of Accenture. My duties included the following: ▪ Led key projects aligned with the client's strategic goals, showcasing project leadership and strategic alignment capabilities. ▪ Successfully led and managed three major projects, ensuring they met important client milestones and demonstrated effective project coordination and management skills. ▪ Prepared critical documents necessary for the delivery and completion of program milestones, evidencing meticulous organizational skills and attention to detail. ▪ Actively steered discussions with project directors and stakeholders, showcasing skills in strategic communication and influence at senior management levels. ▪ Worked in close collaboration with senior stakeholders, ensuring alignment with strategic goals and successful achievement of key program milestones, reflecting a strong capacity for teamwork and stakeholder management. Key outcomes included: ▪ Successfully delivered three major cybersecurity projects simultaneously for a UK Government client, demonstrating the ability to manage complexity, competing priorities and high-stakes deadlines in a regulated environment. ▪ Ensured all projects met critical client milestones, directly contributing to programme progression and client confidence in delivery. ▪ Produced critical programme documentation that underpinned milestone delivery, ensuring governance, accountability and audit trails were maintained to the standard expected of a UK Government engagement.

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401

Cover image for Technical Writing for a major

Technical Writing for a major Retail client that was on the verge of going Public on behalf of Accenture. Working with the Cybersecurity Programme Manager to unify and capture the deployment of several cybersecurity tools (Tanium, Crowdstrike, Tenable) across 120+ organisations. My duties included the following: ▪ Supported the programme lead by documenting all SOPs, policies and standards as required by the Cyber team. ▪ Conducted business requirement gathering sessions to develop subsequent documentation such as skills matrix, roles and responsibilities, RACIs and RAID logs. ▪ Supported on project management tasks such as maintaining the RAID logs, overseeing cyber tool deployment and updated status reports. Key outcomes included: ▪ Created a documentation foundation that the team could operate from independently, reducing reliance on tribal knowledge. ▪ Translated stakeholder needs into structured deliverables — moving from raw requirements to tangible outputs like skills matrices, RACIs, and roles & responsibilities. ▪ Supported successful cyber tool deployment by providing oversight and coordination, contributing to the programme's technical execution.

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191

Cover image for Cybersecurity Strategy Consulting and Project

Cybersecurity Strategy Consulting and Project Management for an airline that was in its start-up phase in the Middle East on behalf of Accenture. My duties included the following: - Leading the Cyber GRC project to build the cybersecurity function for an aviation client, filling a critical security gap and laying groundwork for sustained cyber resilience. - Developing and implementing a cybersecurity strategy and roadmap aligned with ISO 27001 and region-specific regulations. - Executing a specialised threat profiling exercise, developing a unique threat landscape and identifying risks and vulnerabilities specific to the aviation sector. - Creating a detailed cybersecurity strategy and roadmap with an executive summary, ensuring alignment with client objectives and clarity for C-suite stakeholders. Key outcomes included: - Established a cybersecurity function from the ground up, giving the client a formal security posture where none previously existed. - Reduced organisational risk exposure by identifying aviation-specific threats before they could be exploited. - Positioned the client for long-term cyber resilience rather than reactive, ad hoc security responses.

1

194

Cybersecurity Specialist(4)

Guillaume Strohecker

AI Agent Security Auditor | Fast, evidence-based reviews

New to Contra

AI Agent Security Auditor | Fast, evidence-based reviews

Cover image for I recently completed a security

I recently completed a security hardening pass on an AI-enabled mobile product. The most important issues weren’t exotic vulnerabilities. They were practical deployment risks: password reset race conditions missing abuse controls weak retention guarantees mobile backup exposure logging and CI gaps Each confirmed finding was fixed and backed by regression tests before the security baseline was marked PASS. One lesson stood out: security reviews are most useful when they produce evidence and actionable fixes, not just scanner output. I’m now offering focused 24-hour AI Agent Security Mini-Audits for founders and small teams. https://contra.com/s/2Z7YgYXU-ai-agent-security-mini-audit?r=guillaume_strohecker_6m06cchc

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36

Cover image for Mobile Security & Privacy Hardening
Security

Mobile Security & Privacy Hardening Security hardening focused on mobile platform protections and privacy-preserving behavior. Android application backup was disabled to reduce risk around locally stored session material, and release builds were hardened to block cleartext traffic while keeping local development support isolated to debug/profile builds. The review also verified that BLE remains anonymous, one-sided interest stays private, precise coordinates are not exposed publicly, and Social Heat remains aggregate and threshold-gated.

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19

Cover image for API Rate Limiting & Abuse

API Rate Limiting & Abuse Protection Security hardening focused on API abuse resistance. Rate limits were added to registration, login, password-reset request and confirmation, Click Intent creation, and public Heat reads. The limiter was designed with bounded state, explicit email normalization, case-sensitive reset-token fingerprints, expiry sweeping, and fail-closed behavior under saturation. Regression tests verified throttling behavior and recovery.

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26

Cover image for Authentication & Password Reset Hardening
Security

Authentication & Password Reset Hardening Security hardening focused on authentication and account recovery. The work included stronger scrypt password hashing, legacy-hash migration, login timing protections, atomic password-reset token consumption, and session revocation after reset. PostgreSQL concurrency and regression tests verified that a reset token can only be successfully consumed once and that authentication behavior remains safe under failure conditions.

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31

Cybersecurity Specialist(5)

Helping SaaS teams finish security questionnaires with evide

New to Contra

Helping SaaS teams finish security questionnaires with evide

Cover image for VendorOS — Evidence-Grounded Security Questionnaire Workflow

VendorOS — Evidence-Grounded Security Questionnaire Workflow

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3

Cover image for Synthetic — Security Questionnaire Rescue — Evidence Map

Synthetic — Security Questionnaire Rescue — Evidence Map

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3

Cover image for Competitor Radar — Founder-Built B2B SaaS

Competitor Radar — Founder-Built B2B SaaS

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3

Cover image for LAGE — Human-Approved Outreach Workflow

LAGE — Human-Approved Outreach Workflow

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3

Cybersecurity Specialist(2)

🌐 Expert Cloud Security Solutions

🌐 Expert Cloud Security Solutions

Cover image for Comprehensive Azure and SIEM Deployment

Comprehensive Azure and SIEM Deployment

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12

Cover image for Implementation of Cloud Security Controls

Implementation of Cloud Security Controls

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8

Cover image for Azure Sentinel Security Monitoring

Azure Sentinel Security Monitoring

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12

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Cybersecurity Specialist(1)

Dathan Eldridge

I build secure AI and business apps for complex workflows.

New to Contra

I build secure AI and business apps for complex workflows.

Cover image for I designed and built an

I designed and built an AI system guardian focused on operational health, memory, security, resource monitoring and controlled deployment decisions. The system evaluates runtime conditions, identifies risks, records supporting evidence and provides clear hold, approval or rejection decisions before sensitive changes proceed. I led the product architecture, monitoring workflows, decision controls, frontend, backend and testing.

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55

Cover image for I designed and built SYNAPZ

I designed and built SYNAPZ Network Stability, a full-stack connectivity-intelligence platform for diagnosing intermittent internet, Wi-Fi and voice-call problems. The system continuously measures latency, jitter, packet loss, gateway responsiveness and connection interruptions, then converts the evidence into plain-language diagnoses, incident timelines and downloadable technical reports. It includes secure user accounts, private device pairing, a Windows telemetry agent, mobile browser testing, offline buffering, user-scoped data isolation, privacy controls and evidence-led reporting. The product is being expanded into dedicated experiences for home users, gamers, remote workers, businesses and managed IT providers.

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56

Cover image for SYNAPZ — Governed AI Execution and Decision-Support

SYNAPZ — Governed AI Execution and Decision-Support

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6

Cover image for I designed and developed an

I designed and developed an AI-assisted application-building system that supports product definition, architecture, code generation, testing, review, deployment and controlled iteration. Unlike unrestricted code generation, the platform uses structured workflows, specialist agents, human approvals, validation gates and deployment controls to create more accountable and reproducible software builds.

4

182

Cybersecurity Specialist(1)

Dimitris Pallis

Penetration Tester - OSCP 🛡️

5.0: Rating

Penetration Tester - OSCP 🛡️

Cover image for Penetration Tester

Penetration Tester

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47

Cover image for Offensive Security Engineer

Offensive Security Engineer

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44

Cover image for Penetration Testing Expert

Penetration Testing Expert

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25

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Cybersecurity Specialist(3)