Is it Legal for a L2S Visa holder to Start a single-member LLC for SaaS startup while employed on W2 ?

A L-2 S has open-market employment and as long as the work is legal, is not precluded by federal immigration law from working on a W-2 and also beginning a startup LLC. We do not profess to know Texas state law and so cannot give you any advice there. We do not see any negative impact of this arrangement when you travel or when applying for a visa renewal. Due to the limitations of the Lawyers.com Forums, Alan Lee & Arthur Lee, Esqs.’ (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.