Curriculum vitae

Laurence Avent

Security engineer with five-plus years across cloud security, SIEM and detection engineering, incident response, and application security, and founder of Arbiter Security, where I build AI-native security tooling in Rust.

laurence@arbitersec.com

Experience #

Information Security Engineer · Educational Technology company

Apr 2024 – Present · Remote, UK
  • Own SIEM operations end-to-end on Rapid7 InsightIDR: custom detection rules, alert triage, incident-response workflows, and security metrics across the organisation.
  • Configure and manage AWS security services at scale (GuardDuty threat detection, Security Hub posture management, and Lambda-based automated remediation), with secure-by-default patterns for engineering teams.
  • Led response to an active Storm-1811 / Black Basta-style vishing campaign: identified the attack pattern, coordinated cross-team containment, and hardened the environment afterwards.
  • Built internal MCP registry infrastructure (Terraform, CloudFront) for controlled adoption of AI-assisted development tools, and led the security evaluation for the GitHub Copilot Enterprise rollout: IAM controls, policy, and governance.
  • Drive the SOC 2 compliance programme through Drata and coordinate third-party penetration-testing engagements.
  • Embedded security advisor to product teams: design reviews, secure-coding practice, and business risk in plain language.

Security & Compliance Engineer · Encord (YC 2021)

Nov 2022 – Oct 2023 · Remote, UK
  • Configured GCP Security Command Center and Cloud Armor WAF rules for OWASP Top 10 protection across the Google Cloud environment.
  • Hardened multi-cloud storage integrations across Azure, GCP, and AWS: IAM policies, network configuration, and access controls.
  • Owned controls and compliance for the company's first SOC 2 Type II.
  • Managed inbound vulnerability disclosures from external researchers and drove remediation.
  • Brought security requirements into design reviews and automated security testing into CI/CD.

Security Engineer · Kobalt Music

Feb 2021 – Nov 2022 · London, UK
  • Founded the Security Incident Response Team: identified the organisational gap, made the business case, recruited the responders, and delivered an operational SIRT.
  • Led the emergency response to Log4Shell (CVE-2021-44228), coordinating cross-team remediation across production services under time pressure.
  • Discovered and remediated a WAF bypass through independent security testing.
  • Deployed OpsGenie alerting and DataDog security monitoring; drove preventive improvements out of root-cause analysis.

Support Engineer, Enterprise InfoSec GRC · Reciprocity (now ZenGRC)

Jul 2019 – Jan 2021 · Ljubljana, Slovenia
  • Technical support for 250+ enterprise customers on a security GRC platform comparable to Drata or Vanta.
  • Influenced the product roadmap through structured customer feedback on security-workflow UX.
  • Debugged complex issues across REST APIs, SSO/SAML, and role-based access control.

Earlier career · Various

2011 – 2019

Paralegal work, data analysis and business intelligence, and enterprise customer operations. The grounding in regulatory detail, SQL, and stakeholder communication still informs the security work.

Founder · Arbiter Security #

Arbiter · web-application security

arbitersec.com

A Rust vulnerability scanner exposed as an MCP server for AI-agent orchestration. Models web applications as state graphs and uses constraint inference to discover and verify vulnerabilities across 52 classes; every finding is verified in a real browser with a full evidence chain. Scores 100% on Google's Firing Range benchmark (85/85 endpoints); real-world findings have been disclosed to Anthropic and Cloudflare. 267 MCP tools, 468K lines of Rust, 7,800+ tests.

Aletheia · binary analysis

arbitersec.com

A Rust reverse-engineering platform. Disassembles PE, ELF, and Mach-O binaries across four architectures, lifts to a 43-opcode IR, constructs SSA form, and decompiles to typed C. Concolic falsification removes false positives by constructing concrete exploit witnesses through SMT solving; hybrid fuzzing, taint analysis, and scanning across 14 CWE classes. 140 MCP tools, 2,800+ tests.

Open source #

Responsible disclosure #

Details on the disclosures page.

Skills #

Languages
Python, Rust, TypeScript, Go, Elixir, SQL, Shell
Security
Cloud security, SIEM operations, detection engineering, incident response, threat modelling, IAM/RBAC, vulnerability management and research, supply-chain security
Cloud & infra
AWS (GuardDuty, Security Hub, Lambda, IAM), GCP (Security Command Center, Cloud Armor), Azure, Terraform, Docker, CI/CD
Tooling
Rapid7 InsightIDR, Drata, DataDog, OpsGenie, CrowdStrike, Cloudflare
Formal methods
Lean 4, proof-carrying certificates, constraint reasoning

Community #

Education #

BSc (Hons) Marine Studies (Merchant Shipping), 2:1 · University of Plymouth

2007 – 2011

Critical systems analysis, decision-making under uncertainty, positioning systems, and maritime communications. The operational discipline of safety-critical environments still shapes how I approach security engineering.

Away from the screen: surfing off the Cornish coast, hiking on Dartmoor, Filipino martial arts, CrossFit.

Based in Exeter, UK · laurence@arbitersec.com · LinkedIn · GitHub