Freelance Security Engineers in Copthorne

Freelance Security Engineers in CopthorneFreelance Security Engineers in Copthorne

Projects People

Cyber expert specialising in Azure Security Services.

$10k+: Earned

4x: Hired

5.0: Rating

25: 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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Cover image for Extended Interview Process for CrowdStrike SIEM Specialist

Extended Interview Process for CrowdStrike SIEM Specialist

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Cover image for Setting up and optimising Microsoft Sentinel

Setting up and optimising Microsoft Sentinel

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Cover image for Configure SIEM Security Operation using Microsoft Sentinel

Configure SIEM Security Operation using Microsoft Sentinel

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Security Engineer(1)

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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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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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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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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Security Engineer(5)

Dimitris Pallis

Penetration Tester - OSCP 🛡️

5.0: Rating

Penetration Tester - OSCP 🛡️

Cover image for Penetration Tester

Penetration Tester

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Cover image for Offensive Security Engineer

Offensive Security Engineer

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Cover image for Penetration Testing Expert

Penetration Testing Expert

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Security Engineer(3)

Sovereign AI Custody & Temporal Workflow Governance

New to Contra

Sovereign AI Custody & Temporal Workflow Governance

Cover image for Autonomous agents are dangerous without

Autonomous agents are dangerous without a custody layer. The Iron Wolf Advisor dock and OMNI Terminal allow for controlled, human-gated intake of new tasks. No workflow starts without explicit operator authority, and every intent is funnelled through a strict Service Gateway with non-bypass able decision manifests.

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Cover image for Regulated sectors need to know

Regulated sectors need to know exactly what an AI agent did and why it was authorized. This Evidence Vault displays a fully orchestrated proof chain - from browser snapshot to data transformation to client report - each step hash-verified and cryptographically linked. It provides the immutable audit trail that CISOs and regulators demand.

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Cover image for This is not a reporting

This is not a reporting tool. This is a read-only command center that provides real-time observability over a multi-department AI pipeline. It manages worker health, intake queues, and runtime control, ensuring that every AI agent action is governed by human-gated approvals and append-only audit ledgers.

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Cover image for This portfolio visual is a

This portfolio visual is a case-study cover created to summarise a real evidence-backed website and SEO baseline audit delivered to a client. The underlying deliverable included forensic capture, technical findings, performance evidence, and integrity reporting.

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Security Engineer(3)

Moyosore Ogunjale

Okta & IAM Consultant - SSO, SCIM & Identity Automation

New to Contra

Okta & IAM Consultant - SSO, SCIM & Identity Automation

Cover image for Zero Trust Security Hardening

Zero Trust Security Hardening

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Cover image for SSO & SCIM Rollout

SSO & SCIM Rollout

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Cover image for Designed and built a production-ready

Designed and built a production-ready internal AI support bot from scratch. The system uses a five-layer RAG architecture to ingest and retrieve knowledge from different knowledge sources, e.g. Confluence, Jira, Notion, and Slack, enabling staff to get accurate, source-cited answers to internal queries directly within Slack. Built entirely on internal infrastructure using the Claude API, Supabase, and pgvector - ensuring zero data exposure outside the organisation. The knowledge base spans 10,000+ entries across 4 data sources, with hybrid retrieval combining semantic search, keyword fallback, and query rewriting for accuracy. The bot replaced a manual support model, reduced repetitive query handling, and introduced a scalable self-service layer for internal IT support / helpdesk - while resolving the data privacy concerns that had blocked a third-party vendor solution.

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Cover image for Lifecycle Automation - Onboarding &

Lifecycle Automation - Onboarding & Offboarding Description: Replaced a manual spreadsheet-based process with a fully automated system using Okta Workflows and API integrations.

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Security Engineer(2)

DevSecOps & Cloud Compliance & Automation specialist

DevSecOps & Cloud Compliance & Automation specialist

Cover image for Cost Optimization Managed Service

Cost Optimization Managed Service

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7

Cover image for Manage Microservice Infrastructure

Manage Microservice Infrastructure

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Cover image for Cloud architecture automation

Cloud architecture automation

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6

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Security Engineer(1)