The EPC Senior Architect
Delivery Model

Senior architect delivery is important because architecture decisions made early in a Microsoft engagement compound for years — identity model, landing-zone topology, semantic-model design, Purview classification, Sentinel detection strategy, AI governance posture, M&A cutover sequence. The cost of getting those decisions wrong is the cost of redoing them, plus the cost of the workarounds accumulated in between. Senior architects with hundreds of comparable engagements have pattern recognition for where the decisions break; junior delivery does not. The single most consistent root cause of failed Microsoft transformations is junior-staffed architecture decisions made under deadline pressure. EPC's named senior architect signoff model addresses this directly — every architecturally consequential decision is signed off by the named senior on the SOW, with an auditable Architecture Decision Record trail. For regulated industries (HIPAA, FedRAMP, FINRA, CMMC), the named-architect signoff is also material audit evidence.

Yes, for strategically consequential engagements. Errin O'Connor — founder, CEO, four-time Microsoft Press author on Power BI, SharePoint, Azure architecture, and large-scale Microsoft migrations — is named directly on the SOW for high-judgment engagements: regulated-industry transformations, M&A 90-day tenant consolidations on F500 acquirers, strategic AI governance posture work, federal Microsoft scope, and C-suite-led transformations where the executive sponsor wants the named author of the books on the engagement. For other engagements, a partner-tier senior architect with comparable Microsoft seniority on the named technology stack is named on the SOW. EPC's hiring discipline is senior-architect-heavy by design — there are no anonymous junior delivery resources on the bench. Buyers should ask in the fit-call: 'Is Errin specifically on this SOW?' EPC will answer honestly — yes, with named hours, or no, here is the partner-tier senior architect who will be, with comparable Microsoft credentials.

No engagement is too small for senior architect delivery — the question is whether the engagement is too small to justify EPC's fee structure relative to the alternatives. For a tightly-scoped 2-week assessment (Microsoft 365 readiness, Fabric migration scoping, Copilot use-case shortlist, Azure landing-zone assessment), EPC's productized accelerator pricing is competitive with larger firms' analyst-tier delivery on the same scope — and the buyer gets a named senior architect signing off the assessment instead of an anonymous junior delivery resource. For engagements smaller than a 2-week assessment, the question is honest: if the scope is genuinely 40-80 hours of tactical Microsoft work, the buyer is better served by a senior internal resource, a Microsoft partner specializing in that specific tactical scope, or a smaller boutique with appropriate fee structure. EPC does not over-sell engagement size. If the right answer is 'this is too small for a senior architect engagement,' EPC will say so in the fit-call.

Pick a Big 4 firm (Deloitte, Accenture, EY, KPMG) instead of EPC in five specific scenarios. First, when the engagement scope is genuinely 100+ delivery resources, multi-year managed services across multiple platforms — Big 4 is built for that scale and EPC explicitly is not. Second, when global follow-the-sun delivery across 50+ countries is required — Big 4 has the multi-country benches EPC does not. Third, when Microsoft is one of three or more platforms running co-equal transformations under one prime contract — Big 4 multi-stack scope is the legitimate fit, with EPC frequently delivering the Microsoft workstream as a parallel SOW. Fourth, when board-level brand currency at the audit-committee layer is the procurement driver — Big 4 name carries optics no boutique can replicate. Fifth, when offshore-blended pricing at scale is the explicit procurement strategy — Big 4 (and global SI alternatives) field offshore benches EPC does not. For these five scenarios, pick Big 4 without apology. For other Microsoft engagements where named senior architect delivery is the actual differentiator buyers feel, EPC is the rational fit. See /epc-vs-accenture-avanade-microsoft-consulting, /epc-vs-deloitte-microsoft-consulting, /epc-vs-slalom-microsoft-consulting, and /epc-vs-ey-microsoft-consulting for the full per-firm comparisons.

Senior architect delivery is fundamentally different from staff augmentation on three dimensions. First, accountability: a staff augmentation resource fills a seat on the buyer's team and reports to the buyer's manager — the staffing firm is not accountable for the architecture outcome. EPC's senior architect is accountable for the architecture decision on the SOW; the buyer can hold the firm accountable for the outcome. Second, authority: a staff augmentation resource has no authority to sign architecture decisions on behalf of the firm. EPC's named senior architect has explicit authority — and signs the Architecture Decision Record. Third, depth: staff augmentation resources are filled from the staffing firm's available bench, with variable Microsoft depth. EPC's named senior architect is matched to the engagement on Microsoft credentials (designation alignment, comparable engagement history, named technology stack expertise). Buyers who want a Microsoft seat-filler are better served by a staff-aug firm with appropriate pricing. Buyers who want a senior architect accountable for the architecture outcome should pick EPC's senior architect delivery model.

EPC's architecture signoff for regulated industries follows a consistent four-part discipline. First, every architecturally consequential decision generates a signed Architecture Decision Record (ADR) authored by the named senior architect on the SOW. The ADR captures the decision, the alternatives considered, the rationale, the risks, and the rollback path. Second, the signed ADR trail is provided to the buyer as an auditable artifact suitable for HIPAA OCR review, FedRAMP 3PAO assessment, FINRA examination, CMMC C3PAO assessment, GxP inspection, or SR-11-7 model risk review. Third, EPC's compliance posture is mapped to the regulatory framework relevant to the engagement (HIPAA, SOC 2, FedRAMP, FINRA, CMMC, GxP and EU AI Act-aligned governance), so the ADRs reference the specific control framework the auditor will be testing against. Fourth, the named senior architect on the SOW participates directly in regulator interactions when the buyer requests it — examiner walkthroughs, audit interviews, 3PAO assessments. This is the model EPC has used on federal past performance supporting NASA, the FBI, the Federal Reserve, and the Pentagon, and on healthcare HIPAA engagements at Palmetto, ARRT, OMRF, Eisenhower, and Medavie. See /enterprise-regulated-analytics-microsoft for the regulated-industry delivery model in depth.

Yes — Microsoft Press authorship matters as a credibility signal for three concrete reasons that surface in practice. First, the editorial process. Microsoft Press books are reviewed by Microsoft product teams during the writing process; an author who has published four books on Power BI, SharePoint, Azure architecture, and large-scale Microsoft migrations has had multiple rounds of Microsoft product-team review of their architectural thinking on the actual products. That is a credentialing process no certification replicates. Second, the depth of pattern recognition. Writing a 400-page book on a Microsoft product requires synthesizing hundreds of comparable engagements into a teachable framework; that synthesis is the same skill that distinguishes a senior architect from a senior consultant. Third, the procurement signal. When a regulated-industry buyer or a Fortune 500 CIO is briefing their board on the engagement, 'our named senior architect wrote the Microsoft Press book on this product' is a credibility signal that lands differently than a generic Microsoft certification. Errin O'Connor's four Microsoft Press books on the specific products his team architects are a credibility differentiator that buyers cite in fit-calls — and that competitors without comparable authorship cannot replicate.

EPC is honest about the upper bound. The firm does not scale to genuinely 100+ delivery resources on multi-year managed services across multiple platforms — that is Big 4 territory and EPC will say so in the fit-call. The firm does not field global follow-the-sun benches across 50+ countries — delivery footprint is United States and Canada. The firm does not prime multi-stack transformations where Microsoft is one of three or more co-equal platforms — EPC primes Microsoft-anchored programs and delivers the Microsoft workstream of multi-stack programs as a parallel SOW or subcontractor. The firm does not field offshore-blended analyst tiers at scale — onshore senior-architect-heavy mix is the model. For engagements that genuinely exceed these limits, the honest answer is hybrid: engage a Big 4 firm (Deloitte, Accenture, EY, KPMG) as the multi-stack prime, and engage EPC as the Microsoft orchestrator delivering the Microsoft workstream underneath. This pattern frequently wins on procurement: Big 4 brand currency at the prime layer, pure-Microsoft senior-architect delivery at the workstream layer, lower total cost than Big 4 priming the Microsoft workstream too. See /microsoft-cloud-orchestrator for the orchestrator model in depth.