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Sovereign AI Security

Varangian // Cyber

Autonomous offensive security backed by Blackwell-class compute. Full UK jurisdiction. No data leaves British soil.

Autonomous Agents Continuous Pen Testing
Sovereign Compute UK Infrastructure
Adversarial AI Attack Surface Defence
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Real-time intelligence from NVD, CISA KEV, abuse.ch, and curated security feeds — analysed by AI every hour. Critical CVEs, active exploits, malware campaigns, and threat actor activity.
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01 — Positioning

Most cybersecurity firms sell you tools. We deploy autonomous agents that think like attackers, running continuously on sovereign UK infrastructure we own and operate.

No cloud API calls to third-party providers. No data traversing foreign jurisdictions. Persistent, intelligent adversarial pressure on your attack surface — backed by the same class of compute that trains frontier AI models.

The Varangian Guard were Norse warriors entrusted with protecting the Byzantine Emperor. We carry the same mandate: defend what matters most with capability others cannot match.

“The question is no longer whether AI will be used in cyber attacks. It is whether your defences are intelligent enough to respond.”
NCSC Annual Review 2025
02 — Capabilities

Four pillars of sovereign security

Each capability runs on infrastructure under our direct control. No third-party dependencies for sensitive workloads.

01

Autonomous AI Penetration Testing

Continuous. Goal-directed. Sovereign.

Our agents reason about your attack surface, chain exploits, escalate privileges, and pivot laterally — exactly as a senior red team operator would, but at machine speed, around the clock.

  • Goal-directed reasoning, not signature matching
  • Full kill-chain execution from reconnaissance to impact
  • Runs on sovereign UK infrastructure
  • Continuous testing, not annual snapshots
02

Threat Detection & Anomaly Intelligence

Behavioural baselines. Deviations surfaced.

Unsupervised behavioural models of your network, identity systems, and endpoints. When activity deviates from baseline — even in ways no rule could anticipate — our systems surface it before damage propagates.

  • Unsupervised ML across traffic, identity, and endpoints
  • Cross-surface correlation humans miss
  • No reliance on known signatures or IOCs
  • Real-time alerting with full evidence chains
03

Adversarial AI Defence

Testing the systems that test you.

If your organisation deploys AI, it is an attack surface. We test AI systems for prompt injection, model poisoning, memory manipulation, and agent compromise — the vulnerabilities regulation hasn't yet caught up with.

  • Prompt injection and jailbreak testing
  • Model poisoning and data integrity assessment
  • Agent autonomy boundary testing
  • Memory and context manipulation attacks
04

Sovereign Infrastructure & AI Readiness

Your infrastructure. Your jurisdiction.

We help organisations become AI-ready, whether that means deploying agentic workloads on-premise, on UK/EU-sovereign cloud infrastructure, or designing hybrid architectures that bridge both. From initial assessment to production deployment, we build the platform your AI agents will run on, within the jurisdictions you choose.

  • On-prem and UK/EU-cloud AI deployment architecture
  • Agentic AI stack design, training, and operationalisation
  • NCSC Cyber Assessment Framework alignment
  • Compatible with UK/EU-sovereign providers (Rackspace UK, Redcentric, Colt, OVHcloud, Scaleway, Hetzner)
  • Supply chain hardening and data sovereignty audit
03 — Infrastructure

Built, not rented

Every engagement runs on infrastructure we own and operate within the United Kingdom. This is not a cloud instance. This is sovereign capability.

Blackwell-Class GPU
Hundreds of GB
Unified VRAM
200 GbE Fabric
Sub-Microsecond
Internal Switching
Petascale Storage
Erasure-Coded
Distributed
Terabytes of ECC
Error-Correcting
System Memory
UK Jurisdiction
No Data Leaves
British Soil
Geographic DR
Disaster Recovery
Across UK Sites

The same class of compute that trains frontier AI models. Blackwell-class GPUs, 200-gigabit internal fabric, petascale erasure-coded storage, and terabytes of ECC memory. Purpose-built for running autonomous security agents at scale — not borrowed from a hyperscaler.

04 — UK Landscape

The threat environment is accelerating

The Cyber Security and Resilience Bill expands NIS regulations to managed service providers, data centres, and critical suppliers. It introduces 24-hour incident reporting obligations and tougher penalties than either NIS2 or GDPR.

The Government's Cyber Action Plan, published January 2026, commits £210 million to national cyber resilience. Simultaneously, NCSC reported that nationally significant incidents have doubled year-on-year.

Autonomous AI agents now top HackerOne vulnerability disclosure leaderboards. The asymmetry is clear: attackers are deploying AI at scale. The question for boards is whether their defences have kept pace.

204
Nationally significant cyber incidents in the past 12 months — double the prior year. (NCSC)
£210M
UK Government investment in the Cyber Action Plan, January 2026.
$4.45M
Average cost of a data breach globally. (IBM Cost of a Data Breach Report)
78%
Of organisations plan to adopt autonomous security testing by 2026. (McKinsey)
05 — Leadership

Principal

Heimir Helgason

Heimir Helgason

Founder & Principal

Background in sovereign AI infrastructure, adversarial system testing, and frontier-class compute environments. Builds and operates the Blackwell-class research cluster that underpins Varangian's offensive security capabilities.

Previously in quantitative finance and algorithmic trading, where latency discipline and system reliability were non-negotiable. Now focused on building the autonomous offensive security capability the UK needs as AI reshapes the threat landscape.

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ops@varangian.ai