FwChange is not a product built by developers who read about firewalls. It was built by a practitioner who has spent 17 years inside enterprise security operations.
Senior Network Security Consultant
Nicholas Falshaw is a Senior Network Security Consultant specializing in enterprise firewall migrations, network security architecture, and security automation. With over 17 years of hands-on experience across the UK and DACH regions, he has delivered security engineering for some of Europe's largest enterprises.
His career spans 280+ firewall migration projects across financial services, critical infrastructure (KRITIS), automotive, energy, FMCG, and telecommunications sectors. Engagements include Deutsche Bank, Allianz, SAP, Porsche, BASF, Worldline, Vattenfall, Prudential, Unilever, and Caterpillar.
FwChange was born from the direct observation that enterprise firewall migration projects consistently suffer from the same preventable failures: undetected shadow rules, manual translation errors between vendor syntaxes, and the absence of automated compliance validation. FwChange encodes 17 years of field-tested methodology into software.
Security architecture and firewall migration engagements delivered for 11 of Europe's largest enterprises.
Deutsche Bank
Allianz
SAP
Porsche
BASF
Worldline
Vattenfall
Prudential
Unilever
Caterpillar
Orange Business Services
Industry-recognized certifications spanning network security, enterprise architecture, cloud security, and information security management.
CCIE Security (Written)
Cisco Systems
ISO 27001 Lead Implementer
PECB / BSI
TOGAF 9 Certified
The Open Group
AI-102: Azure AI Engineer
Microsoft
AZ-500: Azure Security Engineer
Microsoft
CEH: Certified Ethical Hacker
EC-Council
Palo Alto Networks PCNSE
Cisco CCNP Security
Fortinet NSE 4/7
Check Point CCSA/CCSE
Representative projects from 17 years of enterprise security architecture. Client names anonymized per NDA obligations.
Tier-1 Financial Services Client
Senior network security consultant on a large-scale firewall estate migration exceeding 10,000 rules across multiple data centers. Delivered vendor transition with staged cutover, rule-base rationalization, and comprehensive change management documentation.
European Critical Infrastructure Operator
Network security engineering for BSI-regulated critical infrastructure. Implemented firewall policies and segmentation architecture aligned with IT-Sicherheitsgesetz 2.0 and KRITIS requirements for regulated sectors.
Global Payment Processor
PCI-DSS firewall work for a tier-1 payment processor. Rule-set rationalization, vendor migration, and audit-trail documentation across the payment processing environment.
Original technical writing on AI security, firewall change management, and compliance frameworks. Each piece authored by Nicholas Falshaw, drawing on direct field experience across DAX-30 and KRITIS-regulated environments.
Practitioner mapping of CISA CPGs, NIST 800-53, EO 14028 and CIRCIA into a single evidence pack for US critical-infra operators.
MethodologyOriginal 3-stage LLM pipeline for firewall rule classification with structured output, labeled-set evaluation, and audit trail.
Methodology7-class threat model for multi-agent LLM systems with concrete defenses, sandbox patterns, and EU AI Act mapping.
ComplianceMapping NIS2 Article 21's risk-management measures to the specific firewall documentation auditors expect.
CompliancePractitioner mapping of EU AI Act Articles 9-15 to concrete technical controls, with ISO 42001 and ISO 27001 crosswalks.
ArchitectureWhy ZT does not eliminate firewalls, and how change-management practices must scale with micro-segmentation.
ArchitectureWhen cloud LLM APIs are not an option: data sovereignty obligations, air-gap realities, hardware economics, operational pattern.
ComplianceThe 12 controls ISO 27001 certification auditors actually examine during surveillance and recertification audits.
The FwChange methodology applies AI-driven logic mapping, cross-vendor translation, and automated compliance validation to enterprise firewall migration projects. The approach reduces typical migration timelines from 6-12 months to 6-10 weeks while improving rule-base hygiene through automated shadow rule and conflict detection.
Seven security tools developed across the firewall lifecycle. Each is an independent application demonstrating a different facet of the methodology: change management, vendor migration, compliance automation, penetration testing, threat intelligence, network mapping, and a unified consultant platform.
For product inquiries, partnership opportunities, or enterprise evaluations, use the contact form below or request a demo through the website.
FwChange is developed and operated as a dedicated security engineering practice. All intellectual property, including the AI-driven logic mapping methodology, is owned by the practice.
Request a personalized demo or discuss how FwChange can solve your firewall management challenges.
