Network Engineering Consultancy
SZI Systems delivers senior-level network engineering consulting for globally distributed enterprises — with a track record spanning multi-continent network architectures across North America, EMEA, and APAC. Specializing in DDI, NTP, Global Traffic Management, Internet Resource Management, CDN, and network security, across both IT and OT environments. Actively serving clients in aerospace, healthcare, and oil & gas.
Deep specialization across DDI, Internet resource management, Content Delivery Networks (CDN), network security, cloud architecture, global load balancing, and network automation — engineered for global enterprise environments spanning IT and OT.
End-to-end DDI architecture for large, globally distributed enterprises — namespace planning, DNS topology, DHCP scope design, and full IPAM framework implementation across multi-continent environments.
Also covers enterprise NTP infrastructure design including hierarchy, redundancy, and failover planning. Both DNS and NTP are architected for Anycast distribution, delivering resilient, low-latency service across all sites and regions worldwide. IP address planning incorporates route summarization principles to maintain clean, scalable routing tables and minimize routing overhead as the enterprise network grows. Includes Extranet and third-party DNS Landing Zone design for controlled partner and vendor name resolution with strict namespace isolation, and DNS architecture support for Mergers, Acquisitions & Divestitures (M&A/D) — managing namespace consolidation, trust boundaries, and DNS cutover strategies across complex organizational transitions. Includes mail exchange security design — implementing SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting & Conformance) policies to protect enterprise domains against spoofing, phishing, and unauthorized mail relay.
End-to-end network architecture for large-scale, globally distributed enterprise environments — spanning on-premises, hybrid, and multi-cloud deployments.
Translates complex multi-site, multi-region requirements into scalable, maintainable infrastructure using Cisco Meraki, SD-Access (SDA), and SD-WAN for intelligent, policy-driven connectivity. Extends seamlessly into AWS and Microsoft Azure with Hybrid Cloud DNS integration, multi-region VPC/VNet design, and VMware vSphere virtualization. Identity infrastructure is deeply integrated into the network design — encompassing AD forest and domain architecture, multi-domain trust relationships, site and replication topology aligned to WAN boundaries, OU structure, Group Policy architecture, and DNS namespace planning for AD-integrated zones. Hybrid identity extends to Azure Active Directory (Entra ID) via Azure AD Connect, enabling SSO, Conditional Access, and identity governance across on-premises and cloud. Incorporates Anycast routing, network segmentation, and implementation-ready documentation.
DNS-layer protection and enterprise-wide security visibility.
Covers DNSSEC for data integrity, DNS Firewall via Response Policy Zones (RPZ) for resolver-level threat blocking, and Threat Intelligence feed integration. Includes detection of DNS tunneling and covert exfiltration techniques, as well as visibility and control over encrypted DNS protocols — DNS over HTTPS (DoH) and DNS over TLS (DoT) — to maintain security posture without sacrificing privacy. Machine Learning models are applied to DNS telemetry for anomaly detection, surfacing behavioural deviations and early indicators of compromise that signature-based tools miss. Security event log aggregation into SIEM platforms including Splunk and ELK Stack (Elasticsearch, Logstash, Kibana), with ServiceNow integration for automated incident management. Vulnerability management is addressed through Qualys for continuous network scanning, asset discovery, and compliance reporting. URL filtering provides granular policy-based control over web access, blocking malicious, unauthorized, or non-compliant destinations at the network layer.
Architecture and integration of CDN and network security solutions for mission-critical enterprise applications.
Expertise with Akamai and Cloudflare — covering Secondary DNS provider design for resilience, DDoS scrubbing against volumetric attacks, and Web Application Firewall (WAF) for application protection. Also covers enterprise Proxy Management — including Netskope for cloud-native secure web gateway and CASB, and Broadcom (formerly Bluecoat/Symantec) proxy platforms for on-premises and hybrid web traffic inspection, URL filtering, and policy enforcement. Certificate and key lifecycle management is addressed through Venafi for enterprise-wide PKI automation, covering TLS/SSL certificate provisioning, renewal, and revocation across hybrid environments, alongside CAA (Certification Authority Authorization) DNS record management to restrict which certificate authorities may issue for enterprise domains.
Enterprise load balancing for globally distributed, multi-region, multi-tenant environments.
Specializing in Global Server Load Balancing (GSLB) via DNS — leveraging F5 BIG-IP GTM and LTM for intelligent traffic steering, geo-aware failover, and high availability across geographically distributed datacenters and cloud regions. Also covers Infoblox DNS Traffic Control (DTC), enabling DNS-based application delivery, health-monitored load balancing, and topology-aware traffic steering natively within the Infoblox DDI platform — without requiring a separate load balancer. SSL offloading is implemented at the load balancer tier — terminating TLS/SSL sessions on F5 BIG-IP to decrypt traffic centrally, reducing compute overhead on backend servers and enabling deep packet inspection, security policy enforcement, and performance optimization at scale.
Comprehensive management of externally-facing Internet resources at global scale.
Covers engagement with Domain Registrars and Regional Internet Registries (ARIN, APNIC, AFRINIC, RIPE NCC) for public IP address allocation, domain governance, and policy compliance. Includes External ASN management, External Reverse DNS for public IP space, IPv6 planning and deployment, Dual Stack (IPv4 & IPv6) including via Akamai, and end-to-end External Domain management. Routing security is enforced through RPKI (Resource Public Key Infrastructure) for cryptographic origin validation of BGP announcements, and ASPA (Autonomous System Provider Authorization) to prevent route leaks and unauthorized path propagation — ensuring the integrity and authenticity of global routing at scale.
Reducing operational toil through intelligent automation of network provisioning, DDI workflows, and infrastructure management.
Scripting expertise in Python, Bash, and C/C++ — with REST and SOAP API integrations connecting network platforms to monitoring systems, ITSM tools, and enterprise data pipelines. Leverages AI-assisted development tools including Claude and GitHub Copilot to accelerate automation engineering and infrastructure-as-code delivery. Orchestration and configuration management via Ansible, infrastructure provisioning with Terraform, and version control through GitHub. Applied to DNS/DHCP/IPAM lifecycle management, SD-WAN orchestration, and automated incident workflows.
Deep-dive assessments of existing enterprise network and DDI environments.
We surface gaps, risks, and optimization opportunities — delivering a prioritized remediation plan with actionable recommendations tailored to your team's capacity, tooling, and long-term strategy. Includes Method of Procedure (MOP) development, Standard Operating Procedures (SOP) documentation, and Disaster Recovery / Business Continuity Planning (DR/BCP) playbooks to ensure operational resilience. SZI Systems supports organizations preparing for federal-level audits by ensuring network infrastructure documentation, controls, and configurations meet the rigorous compliance and evidence standards required by regulatory frameworks such as FedRAMP, FISMA, and NIST.
We listen first. Understanding your environment, constraints, and goals before any design begins.
Crafting a purpose-built solution aligned to your scale, operational model, and long-term strategy.
Clear, thorough technical documentation your team can understand, own, and maintain independently.
Available as a trusted advisor during implementation — ensuring designs translate cleanly to production.
We don't design for complexity — we design for clarity. Large enterprises deserve network infrastructure that is both technically excellent and genuinely straightforward to operate.
Vendor-agnostic thinking. Recommendations driven by your environment, not a product portfolio.
Operational reality first. Every design accounts for your team's size, skills, and day-to-day demands.
Built to outlast the engagement. Documentation your team can maintain and evolve without us.
Honest, direct communication. We explain trade-offs clearly so you can make informed decisions.
Senior-level expertise across every layer of globally distributed enterprise network infrastructure — not a generalist, not a reseller.
Extensive senior-level experience delivering network infrastructure across highly regulated, globally distributed enterprise environments — architecting and operating at VP level across North America, EMEA, and APAC.
Recognized DDI SME with hands-on delivery across Infoblox BloxOne, NIOS & UDDI, Diamond IP, ISC BIND/Kea/DHCPd, and Microsoft DNS/DHCP platforms.
Deep experience integrating CDN-based security — DDoS scrubbing, Secondary DNS, WAF via Akamai and Cloudflare — with DNS-layer defences including DNSSEC and RPZ.
Equally at home designing on-premises networks and architecting hybrid or multi-cloud solutions spanning AWS, Azure, and VMware vSphere environments.
Proven track record automating complex network and DDI workflows with Python, Bash, and C/C++ — reducing operational toil and enabling scalable, repeatable delivery.
We work alongside your team, not above it. Knowledge transfer and capability-building are part of every engagement — so you're never dependent on us to keep the lights on.
SZI Systems has earned its expertise within some of the most demanding and compliance-driven network environments in the world — global enterprises operating across multiple continents where uptime, security, and engineering precision are non-negotiable.
That foundation of discipline is what we bring to clients in aerospace, healthcare, and oil & gas — sectors where network infrastructure is mission-critical and failure is not an option.
Reach out directly or fill in the form — we typically respond within one business day.
Whether you're architecting a new DDI platform, integrating network security, extending services to the cloud, or looking to automate manual workflows — bring us your hardest problems.