Booking Q3 2026 · 2 retainer slots open · Direct or via SI Paris ·Seoul
Sébastien Tang SALESFORCE SOLUTION ARCHITECT
ABOUT · INDEPENDENT SENIOR ARCHITECT

The architect senior teams call when failure is not an option.

Fourteen years in IT, ten on Salesforce. L'Occitane, Sanofi, TotalEnergies, Lacoste, Disneyland Paris, Suntory, Affirma Capital. Programs where the consequence of failure was institutional, not commercial.

Built my foundation at Cognizant, one of Salesforce's largest Summit Partners. I know exactly where SIs do well, and where they fall short. That perspective shapes how I architect today: diagnosis first, time-bound, deliverables you own.

Sébastien Tang, Senior Salesforce Solution Architect
PARIS · SEOUL 2026
YEARS 14+in IT · 10+ on Salesforce
BASED Paris · SeoulEU + APAC time zones
LANGUAGES EN · FR · KRWorking delivery in all three
CERTIFICATIONS 5Admin · App Builder · AI · MC AE · Associate
ENGAGEMENTS Fixed-feeNDA-default · Reply under 24 h
AVAILABILITY Q3 20262 retainer slots open
§ How I got here

Fourteen years in enterprise IT.

I started in IT project delivery in Paris in the early 2010s. The first Salesforce engagement landed in 2012. The platform was visibly going to swallow enterprise CRM, and I went with it.

From 2018 to 2022 I co-architected the Cognizant EMEA Salesforce practice from 5 to 200 consultants. I built the technical competency framework, the graduate-to-consultant training pipeline, and led the bid solutioning that won the largest enterprise accounts in the region. Eighteen percent year-on-year account expansion across four years.

That is why I understand SIs from the inside. I am not guessing at how the body shop works. I built one. I know how SIs scope, how they staff, where they cut corners, and exactly where delivery breaks down. The architecture I do now is shaped by what I learned there, and by what I refused to repeat.

When you engage me, you get me. Not a junior consultant learning on your project. The anti-promise · since 2022

I left Cognizant in 2022 to run senior architecture without the staffing politics, the upsell agenda, or the billable-hour inflation. The clients on this page came with me, and stayed. Disneyland Paris, Lacoste, L'Occitane Group, Sanofi, Suntory, TotalEnergies, Affirma Capital. Most of them you can verify on the case studies page; a few you cannot, because the work was confidential.

§ What I do now

Three engagement tiers, one method.

Agentforce architecture. For organizations whose AI pilots are stalling. Agent design patterns, prompt and grounding architecture, governance, ROI math, integration with Data 360.

Data 360 foundations. For organizations with multi-cloud Salesforce footprints, data fragmentation, or a Data 360 mandate blocking downstream AI ambitions. The clean data layer agents need to operate on.

Org Health Recovery. A confidential, independent read for derailed or drifted programs that need a clean diagnostic before anyone signs another statement of work. Technical-debt audit, sequenced recovery plan, hand-off.

Every engagement runs the same Foundation Method. Diagnosis first, time-bound inside 90 days, deliverables the client owns and can audit independently. No discovery theatre. No slide-decks-as-deliverables. No vendor-locked recommendations.

§ Two markets, one method

Paris and Seoul, same week.

I work from Paris and Seoul. Mornings are deep work in the local time zone. Afternoons and evenings overlap European business hours; the next morning resumes APAC. The work and the method do not change between the two markets. The translation does.

In EU contexts I work as a Senior Salesforce Solution Architect. The audience reads Salesforce as the unambiguous credibility signal. In Korea and broader APAC I work as a Senior Solution Architect, AI plus Salesforce, because the local market reads Salesforce-only as narrow when the same depth opens to AI-fluent senior architects. Same person, same standards.

§ The practice arc

Fourteen years.
Nine programs that mattered.

How I got from a first Salesforce project in 2012 to running an independent senior architecture practice today. Named clients pinned to the years that produced them.

SI YEARS · 2010 → 2022

2010 · Paris
Masters in Management and IT Project Management.
University of Sydney; IGS Paris.
2012
First Salesforce engagement.
The decade-long bet on the platform starts here.
2016 → 2017 · Paris
CrossTalent · AppExchange ISV.
Lead PM and architect on a native HR application shipped to AppExchange. Platform-level architecture inside packaging constraints.
2018 → 2022 · EMEA
Cognizant. 5 → 200.
Co-architected the EMEA Salesforce practice from 5 to 200 consultants. 18% YoY account expansion. Summit Partner delivery standards. This is where I learned exactly what SIs are good at, and where they fail.
2019 → 2021 · Paris
TotalEnergies Center of Excellence.
9-person CoE. 8M+ customer records governed. 99.9% availability across Europe and Africa.
2021 → 2022 · Paris
Sanofi · zero-loss migration.
8M+ records, 7 legacy systems consolidated into a single Salesforce environment. Migration error rates cut by 85%.

INDEPENDENT · 2022 → NOW

2022 · Paris
Disneyland Paris · B2B transformation.
Pan-European technical audit. Authored the RFP that scoped the vendor to the architecture (not the other way around).
2023 · Paris
Lacoste · Customer 360.
€2M+ CRM portfolio. 5-year roadmap board-validated. 50+ strategic risks neutralized pre-launch.
2023 → 2024 · Seoul
The move to Korea.
L'Occitane Group. 3,000+ retail touchpoints governed under a unified framework. Bilingual delivery becomes a structural advantage.
2024 · Seoul
Suntory Global Spirits.
Greenfield Consumer Goods Cloud across 4 geographies in 4 months. Zero scope misalignment.
Oct 2024 → now
Independent practice.
Affirma Capital PE due diligence. €4M+ regulatory exposure surfaced before close. The Foundation Method takes its current shape.
Q3 2026
2 retainer slots open.
Booking direct or via SI. You are here.
§ The receipts

Numbers paired with the program that produced them.

Full case studies →
€4M+
regulatory exposure identified before close
Affirma Capital
8M+
records migrated, zero loss
Sanofi
3,000+
retail touchpoints governed
L'Occitane
50+
strategic risks neutralized pre-launch
Lacoste
99.9%
availability, EU + Africa CoE
TotalEnergies
5 → 200
EMEA practice scaled in four years
Cognizant
L'OCCITANE KOREA · SEOUL
§ Named client testimony
“His insights are always spot-on and incredibly valuable. He is a tremendous asset to any team.”
Juno Noh · Senior IT Manager, L'Occitane Korea

SALESFORCE CERTIFICATIONS · 5

01 Certified Administrator
02 Certified App Builder
03 Certified AI Associate
04 Certified Associate
05 Marketing Cloud · Account Engagement Specialist

EDUCATION

Master of Management
University of Sydney
Master of IT Project Management
IGS Paris
Continuing education tracked on Trailhead; AI-era architecture certifications maintained as the platform evolves.
§ FAQ

Questions, answered.

What CTOs, SI delivery leads, and procurement teams ask before the discovery call. If your question is not here, the fastest reply is by email; under 24 hours, always.

Who is Sébastien Tang?
Independent senior Salesforce solution architect based between Paris and Seoul. 14 years in IT, 10+ on Salesforce. Cognizant alumnus. Specializes in Agentforce and Data 360 architecture for European and APAC enterprises.
What does an architecture engagement look like?
Three phases of the Foundation Method: diagnosis (2 to 4 weeks, written architecture diagnosis the client owns), architecture (target state, transition path, governance, decision log), and execution (recovery sprint or build, paired with a transfer plan). Time-boxed inside 90 days.
How is this different from hiring an SI?
No junior swap-outs, no upsell agenda, no billable-hour inflation. The senior you spoke to is the senior doing the work. Engagements are fixed-fee where possible, NDA-default, with deliverables you own and can audit independently of any platform vendor.
Which industries and regions?
Pharma and life sciences, luxury retail, energy, financial services, entertainment. Direct delivery across France, BeNeLux, DACH and South Korea. EU and APAC time zones in the same week. EN, FR, KR working languages.
Direct engagement or via an SI partner?
Both. Direct with client teams, and as a senior subcontractor to SI partners who need a senior architect on a regulated, stalled, or AI-era program. Booking Q3 2026; 2 retainer slots open.
What about Agentforce specifically?
The two most common reasons Agentforce pilots stall are not Agentforce: they are the data layer below it and the governance layer around it. I work the architecture, not the demo. Agents that work in demos fail in production because the underlying architecture (data access, security model, integration layer) was not designed for AI.
BOOK THE CALL

Let's talk architecture.

Whether you are mid-pilot, mid-RFP, or mid-recovery, the call costs nothing and clarifies the next step. 30 minutes, no slides, NDA on request.

  • ·Replies within 24 hours, always
  • ·If I am not the right fit, I will point you at someone who is
  • ·No follow-up emails unless you ask
Book a Discovery Call