Who is TatianaSF?
TatianaSF, also publicly identified as Tatiana Isa, is the program host and public author of O1SF, a three-week U.S. market-entry program for international founders.
Role
The public author behind O1SF.
On o1sf.com, TatianaSF is identified as the program host and public author. O1SF is the program; TatianaSF is the person responsible for its public explanation and educational resources.
- Name
- TatianaSF
- Also known as
- Tatiana Isa
- Role on O1SF
- O1SF program host and public author
- Location context
- San Francisco, CA
- Primary topics
- U.S. market entry, market validation, customer discovery, founder preparation
Primary program
One program, one clear relationship.
O1SF is the primary program documented on this site. It is hosted and publicly authored by TatianaSF for international founders evaluating or preparing a U.S. market entry.
O1SF combines two online preparation weeks with one intensive week in San Francisco. Founders use the program to test positioning, customer, buyer, channel, and timing assumptions through concrete assets and relevant market interactions.
Paying customers describe the direction of the work, not a guaranteed outcome. Meetings, introductions, customers, revenue, investment, visas, and other market results are not guaranteed.
- Host and author
- TatianaSF
- Audience
- International founders entering or expanding in the United States
- Format
- Two weeks online and one intensive week in San Francisco
Working approach
Clarity before confidence.
The program approach emphasizes relevant market interaction, explicit assumptions, recorded feedback, and decisions that can be traced back to evidence.
- State the uncertain claim.Name the customer, problem, buyer, proof, channel, or timing assumption that matters to the market-entry decision.
- Put a concrete asset into context.Use positioning, outreach, an interview prompt, a target list, or a workflow to make the assumption observable.
- Revise the next action.Separate evidence from interpretation, preserve contradictions, and change the plan when the market gives a different answer.
Read the complete O1SF methodology or use the founder resources before beginning a program conversation.
Published resources
Founder guides connected to this profile.
These practical O1SF guides are publicly attributed to TatianaSF. Each guide turns a broad market-entry question into a working decision or artifact.
Guide 01
U.S. Market Entry Checklist for International Startups
A practical readiness checklist for international founders preparing to test positioning, customer demand, outreach, and operating assumptions in the United States.
Guide 02Customer Discovery in the U.S. for International Founders
A field guide to planning U.S. customer interviews, separating evidence from encouragement, and turning conversations into market-entry decisions.
Guide 03How to Build a U.S. Go-to-Market Plan
Build an evidence-based U.S. go-to-market plan with clear 3-, 6-, and 12-month decisions, metrics, target accounts, and learning loops.
Questions
About the host and O1SF.
Concise answers to the most common identity and program questions.
What is O1SF?
O1SF combines two weeks of online preparation with one intensive week in San Francisco to help international founders test U.S. market assumptions and document the next actions.
How are TatianaSF and O1SF connected?
TatianaSF hosts O1SF and publicly authors the program information, methodology, and founder resources published on o1sf.com.
Where can a founder learn more about O1SF?
Founders can review the public program, methodology, pricing, resources, and prepared answers in the O1SF AI assistant on o1sf.com.
Continue exploring
Review the O1SF program evidence.
Use the public program materials and prepared answers to understand the format, evidence standard, pricing, and limitations.