Regional Zero-Trust Segmentation Director — Digital Commerce

The mandate

Regional applications share flat connectivity through acquired data centres and cloud networks, allowing a compromised service identity to reach payment, fulfilment and customer-data tiers. Traffic inventories disagree with application diagrams, and emergency rules created during acquisitions have no current owners. The defined problem is to enforce minimum necessary service paths across six markets without destabilising peak commerce or assuming every observed flow is legitimate.

Deliverables are an observed-flow baseline, trust-zone model, policy catalogue, exception process, enforcement design, migration waves and operator runbook across six markets. Each policy must link service identity, source, destination, protocol, business purpose and rollback owner, while shared regional services need explicit blast-radius treatment rather than a blanket trusted zone.

Milestone one on 30 October 2026 accepts the dependency map; milestone two on 4 December delivers approved policies and shadow enforcement; milestone three on 22 January 2027 completes two market pilots; final delivery on 26 February requires regional rollout design, failure tests and handover. Each review records deferred dependencies and the commercial event that will retire them.

Acceptance requires service owners to reconcile flows, blocked-path tests to contain simulated compromise, latency and checkout success to remain within tolerance and operators to implement one wave unaided. Deliberate policy failure must trigger the documented rollback without restoring broad connectivity. The Architecture Council and two market technology heads jointly sign final acceptance before the last milestone is invoiced.

The client supplies flow telemetry, architecture records, test environments, service owners and maintenance windows, with market sponsors resolving disputed dependencies within forty-eight hours. The consultant cannot authorise production outages, change payment controls or purchase platforms; client change managers execute every enforcement step and retain operational accountability.

Why this is external work

Network and application teams disagree over dependency truth and outage ownership. Internal architects are committed to feature delivery. An external director can impose evidence and acceptance without protecting a legacy topology.

What you will own

• Discover actual east-west and cross-market flows with service identity, business purpose, technical ownership, observed frequency and peak-period behaviour.
• Define trust zones around data sensitivity, transaction role, administrative reach, market dependency and plausible compromise blast radius.
• Translate observed dependencies into explicit allow policies and deny defaults.
• Design expiring exceptions with measurable compensating controls, named business sponsors and accountable retirement dates.
• Pilot shadow then enforced segmentation under peak-like load and failure injection.
• Measure blocked attack paths, policy drift, latency and operational recovery.
• Transfer policy-as-code, regression tests, rollout waves and troubleshooting decisions through an operator-executed production change.

Candidate qualifications

• Directed zero-trust segmentation across multi-cloud and legacy regional estates carrying revenue-critical customer transactions in multiple jurisdictions.
• Can evidence containment improvement without material production instability.
• Built enforceable policy from observed service identity, flow data, application-owner evidence and documented deny and rollback behaviour.
• Managed shadow enforcement, false-dependency resolution, exception retirement and controlled rollout under measurable availability tolerances.
• Led application, network, SRE and business owners across Asian markets through shadow enforcement and production change.
• Delivered repeatable operations rather than a conceptual target architecture.

Non-negotiables

• Available for Singapore and scheduled regional sessions.
• Independent of segmentation platform vendors under review.
• Will accept performance and containment acceptance tests.
• Has director or principal authority over production security architecture.

1. 49 words maximum. Which telemetry would you distrust when building the first service-flow map?
2. 49 words maximum. Describe a segmentation rule that broke production and how you corrected the method.
3. 49 words maximum. What containment test proves a pilot reduced meaningful attack paths?