EPC Group vs Slalom
for Microsoft Consulting (2026)

Slalom is a privately held, Seattle-headquartered consulting firm founded in 2001, with roughly 13,000 employees across approximately 40 metro markets including Boston, Chicago, New York, San Francisco, Seattle, Atlanta, Dallas, Houston, Los Angeles, and additional U.S. metros plus London, Toronto, and several international markets. The firm holds Microsoft Solutions Partner Designations, AWS Premier Tier status, and Salesforce Summit Partner status, and is one of the small set of national consultancies that has formal alliance status across Microsoft, AWS, Salesforce, Databricks, and Snowflake at meaningful depth.

The firm's defining feature is its regional metro-area delivery model. Each Slalom market — Slalom Boston, Slalom Chicago, Slalom Seattle — operates with significant local autonomy, a metro-resident senior consulting bench, and a relational client model built around dedicated in-market account teams. Buyers in major metros frequently see the same Slalom account leadership over multi-year horizons. This is structurally different from a pure remote-first boutique and structurally different from a Big 4 leverage pyramid — it is a senior-consulting-culture regional model purpose-built for mid-market and F500 buyers headquartered in named metros.

On Microsoft specifically, Slalom delivers Microsoft 365, Azure, Power BI, Fabric, Power Platform, Copilot, and Dynamics 365 engagements at strong quality across most of its markets, with notable Microsoft depth in Seattle (Slalom's home metro and Microsoft's home metro) and Atlanta. Microsoft is one of several first-class Slalom practices alongside Salesforce, AWS, and data engineering, not the institutional center of gravity in the way it is for a pure Microsoft Solutions Partner. Pricing is typically T&M with metro-tier rate cards roughly comparable to other senior-led national consultancies — sometimes slightly above for senior Slalom practice leads in named metros.

EPC Group is a pure-Microsoft Solutions Partner — all six current designations, four-time Microsoft Press author founder writing on Power BI / SharePoint / Azure / migrations, 6,500+ SharePoint deployments, 1,500+ Power BI deployments, and 11,000+ total Microsoft engagements. Slalom holds Microsoft Solutions Partner Designations and delivers Microsoft 365, Azure, Power BI, Fabric, Copilot, and Dynamics 365 at strong quality, particularly in Seattle and Atlanta. The honest difference: Microsoft is the institutional center of gravity at EPC Group; Microsoft is one of four-to-five first-class practices at Slalom alongside Salesforce, AWS, Databricks, and Snowflake. For buyers who explicitly want pure-Microsoft architectural depth with a named architect who has written the books your team reads, EPC Group is the better-fit firm. For buyers who want Microsoft delivered well as part of a multi-platform Slalom relationship, Slalom is a legitimate choice — particularly in its strongest metros.

Slalom legitimately wins this dimension. The 40-metro regional model — Slalom Boston, Slalom Chicago, Slalom Seattle, Slalom San Francisco, Slalom New York, Slalom Atlanta, and dozens more — is purpose-built for buyers who value in-market presence, coffee-distance proximity to the client team, and a relational consulting culture that retains the same senior consultants across multi-year horizons. The relational model fits mid-market and F500 mid-cap buyers in named metros particularly well. EPC Group delivers remote-first with a smaller office footprint (Houston HQ, plus Dallas, Chicago, San Antonio, Washington D.C., and Kansas City) — strong national coverage but not the same regional metro model. For buyers whose procurement preference is "we want a local team we can grab coffee with in our HQ city," Slalom is the legitimate fit in metros where it has a deep bench.

Honest read — for mid-market F500 buyers (typically 1,000–10,000 employees) headquartered in metros where Slalom has a deep local practice (Seattle, Boston, Chicago, San Francisco, New York, Atlanta), Slalom's regional model is structurally well-fit and the cultural match frequently lands well. EPC Group is equally capable on the work and frequently lower-cost on tightly-scoped fixed-fee Microsoft engagements, but the regional-relational fit is genuinely a Slalom strength in its strongest markets. Outside those named metros — or for buyers whose procurement preference is "we want the deepest Microsoft architect in the room and don't require a local team" — EPC Group is equally fit or better. The dimension is close, with a modest Slalom edge driven by the named-metro relational model. For buyers prioritizing regulated-industry compliance (HIPAA, FedRAMP, FINRA) the dimension flips toward EPC Group regardless of metro.

EPC Group wins this dimension. The firm's named compliance posture spans HIPAA, SOC 2, FedRAMP, FINRA, CMMC, GxP with EU AI Act-aligned governance baked into delivery. Provider-side HIPAA references include Palmetto, ARRT, OMRF, Eisenhower, and Medavie with BAA-anchored delivery. Federal past performance includes work supporting NASA, the FBI, the Federal Reserve, and the Pentagon. CMMC 2.0, FedRAMP-aligned Azure landing zones, and GCC High Microsoft 365 are part of standard delivery scope. Slalom delivers in regulated industries and has strong references in financial services and healthcare, but does not publish CMMC 2.0 or FedRAMP-authorization-package delivery as a firm-level capability the way a federal-focused specialist does, and does not lead with HIPAA-provider-side or FINRA-broker-dealer regulated-industry depth as a firm-level differentiator. For tightly-scoped regulated-industry Microsoft engagements where compliance posture is the procurement bar, EPC Group is the better-fit firm.

EPC Group has executed 216+ M&A tenant consolidations covering 1.83 million users — a specialized muscle few national consultancies can match. The 90-day cutover pattern, the regulated-industry compliance overlays during cutover, the senior-architect orchestrator model, and the published methodology are exactly the EPC Group sweet spot. Slalom delivers M&A integration work, particularly in its largest metros and for client buy-side acquirers headquartered in those metros, but does not publish a named M&A tenant consolidation methodology at the volume and scale EPC Group has accumulated. For private-equity buy-side platform plays, strategic acquirer post-close 90-day integration, and divestiture carve-out separation work that needs senior-architect-named, compliance-aware Microsoft tenant cutover delivery, EPC Group is the rational choice. For broader M&A integration work where Microsoft is one of multiple workstreams alongside Salesforce, finance ERP, or AWS consolidation in a Slalom metro, the picture is more balanced.

EPC Group publishes fixed-fee accelerator tiers — a 2-week Assessment, a 90-day Accelerator, and a monthly Managed Microsoft Services tier — with costed scope, named deliverables, and a senior architect named on the SOW. Slalom typically delivers on time-and-materials with metro-tier rate cards. T&M is appropriate for many engagements (multi-year managed services, scope-flexing transformations, relational multi-engagement clients) and Slalom's T&M pricing is broadly comparable to other senior-led national consultancies — sometimes slightly above for senior Slalom practice leads in named metros. The dimension EPC Group legitimately wins is published-fee transparency: a buyer can read EPC Group's accelerator tiers on the website, get a costed total inside weeks, and avoid rate-card surprise. Slalom's T&M model is industry-standard and not wrong — but it is not published fixed-fee, and it is not the right model when a buyer's procurement preference is a transparent fixed scope and total.

Why does Microsoft estate depth matter more than firm size for Microsoft consulting?

Microsoft estate depth determines whether the architect in the room can actually design Copilot, Fabric, Azure OpenAI, Power Platform, SharePoint, and Microsoft 365 at lead-architect level — not just spell the products and assemble a delivery team around them. Firm size determines bench capacity, regional presence, and program scale; estate depth determines architectural quality at the senior level. EPC Group holds all six current Microsoft Solutions Partner Designations including Data and AI (Azure), runs delivery on the named The EPC Group Lifecycle, and has a four-time Microsoft Press author founder writing on the products his team architects — Power BI, SharePoint, Azure architecture, and large-scale Microsoft migrations. Slalom holds Microsoft Solutions Partner status and delivers Microsoft work at strong quality, particularly in Seattle and Atlanta, but Microsoft is one of four-to-five first-class Slalom practices alongside Salesforce, AWS, Databricks, and Snowflake. For buyers whose program is Microsoft-anchored at the center of gravity and where the architectural depth bar is "the senior person on the SOW has personally architected this scope at scale before," EPC Group's pure-Microsoft posture frequently lands better outcomes. For buyers running Microsoft as one workstream of a multi-platform Slalom relationship in a metro Slalom dominates, Slalom's multi-alliance footprint and regional presence are the legitimate advantage.

When does Slalom's 40-metro regional model legitimately beat EPC Group's architect-led model?

Slalom's regional model legitimately wins on three buyer scenarios. First, when the buyer is headquartered in a metro where Slalom has a deep local Microsoft practice — Seattle, Boston, Chicago, San Francisco, New York, or Atlanta — and the procurement preference is in-market presence with the same senior account team retained across multi-year horizons. Second, when the engagement is parallel Microsoft + Salesforce or Microsoft + AWS where one consulting firm spanning both stacks at meaningful depth is the procurement requirement — Slalom's multi-alliance footprint is built for this. Third, when the engagement model is genuinely relational and multi-engagement (one firm, multiple workstreams over several years, recurring in-person presence at client HQ) rather than tightly-scoped fixed-fee delivery. EPC Group is built differently — senior-architect-led, named on the SOW, fixed-fee accelerators, compliance-native posture, remote-first delivery with a smaller office footprint — and for the buyer profile that matches that, EPC Group is the better fit. The two firms overlap on capability more than they complement, so the decision typically lands on engagement-model preference rather than capability gap.

How do I evaluate senior-architect ratio when comparing Microsoft consulting firms?

The four questions that surface senior-architect ratio honestly. First, "Who is the named senior architect on the SOW?" Get a name, a LinkedIn profile, and a list of comparable engagements they personally led. EPC Group answers this with the architect on the fit-call. Slalom typically answers with a senior practice lead from the relevant metro Microsoft practice. Second, "Will the senior architect on this fit-call be the senior architect delivering the engagement?" EPC Group answers yes by default. Slalom typically answers yes for the named practice lead, with broader delivery support from a metro consulting team. Third, "What percentage of engagement hours are billed at senior-architect rates vs consultant rates?" EPC Group runs 60–80% senior architect hours. Slalom's senior-consulting culture frequently runs higher senior ratios than Big 4 firms but with broader metro consultant teams on larger engagements. Fourth, "Can I have a reference call with the lead architect from a comparable engagement completed in the last twelve months?" Both firms can typically arrange this. The decision is rarely a senior-ratio gap — it is more often a regional-model preference vs an architect-named preference.

Multi-stack delivery — should I pick Slalom for Microsoft + Salesforce + AWS or EPC Group?

The decision framework: identify the center of gravity of the program. If Microsoft is the platform of record and the other systems (Salesforce, AWS, Snowflake, Databricks) are integration endpoints rather than co-equal transformations under one prime, the program is Microsoft-anchored and EPC Group is the better fit — the firm delivers Microsoft at lead-architect depth and integrates outward, and Slalom's multi-alliance breadth is overhead the buyer pays for but does not use. If Microsoft is one of two or three platforms running co-equal transformations under one prime contract — for example, parallel Microsoft 365 / Power BI and Salesforce Sales Cloud / Service Cloud — Slalom's multi-alliance footprint and ability to field coordinated workstreams across both stacks is a legitimate procurement advantage. The hybrid pattern that occasionally wins: Slalom primes the multi-stack regional relationship, EPC Group delivers the Microsoft workstream as a parallel SOW or subcontract when the buyer wants pure-Microsoft architectural depth on the Microsoft portion. EPC Group does not deliver Salesforce.

Fixed-fee vs T&M — which model is right for Microsoft engagements?

For Assess and early Modernize phases — Microsoft 365 readiness assessment, Power BI / Fabric architecture design, Copilot pilot scoping, Azure landing zone roadmap, M&A tenant consolidation planning — fixed-fee is dramatically better. It forces the consulting firm to commit to a costed roadmap inside weeks, removes pricing uncertainty, and is a strong methodology-maturity signal. EPC Group publishes fixed-fee accelerator tiers with named deliverables and a senior architect on the SOW. For Operate and long-running steady-state work — managed Microsoft services, managed Power BI tenant operations, multi-year transformation across multiple Slalom workstreams in a metro — T&M or per-seat managed pricing is appropriate, and Slalom's T&M model is well-built for that scope. Most multi-phase engagements use both: fixed-fee for the assessment and accelerator, then T&M or managed pricing for the Operate phase. The dimension EPC Group legitimately wins is published-fee transparency in the Assess and Accelerator phases. The dimension Slalom wins is the breadth of T&M and managed-service tiering available across a multi-year, multi-workstream relational engagement.

What does Microsoft Press authorship mean for buyer due diligence?

Microsoft Press is Microsoft's official imprint for technical books, published in partnership with Pearson, with titles reviewed and endorsed by Microsoft's product engineering teams before publication. Authoring a Microsoft Press book on Power BI, SharePoint, Azure, Microsoft 365, or AI requires sustained product depth, peer review by Microsoft engineers, and a level of technical authority very few practitioners achieve. EPC Group founder Errin O'Connor is a four-time Microsoft Press bestselling author — Power BI, SharePoint, Azure architecture, and large-scale Microsoft migrations — published on the very products his team architects. Slalom does not have founder-level or principal-level Microsoft Press authorship as a firm-level signal. This is not a knock on Slalom — most consulting firms, including national consultancies of Slalom's scale, do not have named Microsoft Press authors at firm level. What it means honestly for buyer due diligence: "the founder of EPC Group writes the books your Microsoft architects read on the products you're buying" is a credibility signal procurement teams should weigh when architectural depth at the lead-architect level is the procurement bar. It does not mean Slalom delivers Microsoft work at low quality — Slalom's senior Microsoft practice leads are strong practitioners. It does mean EPC Group has a credibility signal at the founder level that Slalom does not match.

FedRAMP-aligned Microsoft delivery — which firm is the right fit for federal civilian work?

For FedRAMP-aligned Microsoft engagements — Azure landing-zone hardening to FedRAMP High, GCC High Microsoft 365 deployments, CMMC 2.0 Level 2 / Level 3 alignment, FedRAMP authorization package support — EPC Group has named past performance supporting agencies including NASA, the FBI, the Federal Reserve, and the Pentagon, and the firm's compliance-native delivery posture (HIPAA, SOC 2, FedRAMP, FINRA, CMMC, GxP) is structurally suited for tightly-scoped federal Microsoft scope. Slalom delivers in commercial regulated industries and has strong references in financial services and healthcare, but does not publish FedRAMP-authorization-package or CMMC 2.0 delivery as a firm-level capability the way a federal-focused partner does. For tightly-scoped federal civilian Microsoft work, EPC Group is the rational firm. (For multi-billion-dollar federal IDIQ programs spanning Microsoft + ERP + audit + advisory at IDIQ scale, neither EPC Group nor Slalom is the right prime — that is Accenture Federal Services, Deloitte's federal practice, or another global integrator with dedicated federal scale.)

When should buyers pick neither EPC Group nor Slalom?

Neither EPC Group nor Slalom is always the right answer. Several scenarios where buyers should look elsewhere. First, board-level multi-stack transformations with audit-committee briefing requirements where Big 4 brand currency matters as much as delivery outcomes — for that, see https://www.epcgroup.net/epc-vs-deloitte-microsoft-consulting and https://www.epcgroup.net/epc-vs-accenture-avanade-microsoft-consulting for the Big 4 and global SI comparisons. Second, vertical-specialist boutiques in narrow regulated scopes (legal-tech AI, claims-coding AI, insurance-underwriting AI) where domain depth matters more than horizontal Microsoft platform depth — a vertical specialist frequently fits better than either firm. Third, true global pharma GxP work with multi-country FDA/EMA submission lineage — Deloitte or another Big 4 with multi-country GxP practice is the rational choice. The discipline that wins procurement: name the buyer scenario first, then pick the firm that fits it — never pick the firm first and force-fit the scenario. For the broader 9-firm landscape, see https://www.epcgroup.net/best-ai-consulting-firms-microsoft-azure-2026.