Senior Tax Consultant

Orbiss is an advisory and tax firm specialized in business growth in the United States. Founded in 2019, Orbiss helps international small and medium-sized private companies successfully scale up in the United States.

The firm offers a 360 and tailor-made support to its clients' cross-border accounting, tax, and M&A transaction needs. The Orbiss team's vision is modernity. This vision is implemented through an innovative approach focusing on processes automation and aiming to place people at the heart of every decision, every day, in line with our values: kindness, honesty, respect, and integrity.

Orbiss is an innovative, modern, and young firm breaking old habits of the industry.

• Design and lead comprehensive U.S. and international tax planning strategies to High-net worth individuals and business structures.
• Lead cross-border reorganizations analyses and permanent establishment assessments.
• Provide senior-level guidance on tax treaty applications, FATCA, PFIC and CFC/GILTI regimes.
• Conduct detailed tax research and prepare technical memos on U.S. and international tax topics.
• Support the preparation of advisory deliverables related to personal and corporate structuring, and tax optimization.

• Advise U.S. and foreign clients on the design and tax treatment of equity compensation plans like ISO vs. NSO stock options, RSUs....
• Analyze cross-border stock option taxation, including sourcing issues for global mobility employees and executives, and tax opportunities.
• Support clients in structuring 83(b) elections, AMT exposure and QSBS qualifications.
• Coordinate with legal counsel on equity plan documentation for international founders.

• Own a portfolio of senior client relationships, serving as the main point of contact for tax matters throughout the fiscal year.
• Deliver clear, actionable advice on complex tax issues to C-suite executives, founders, and general counsel.
• Lead or co-lead client presentations, strategy sessions, and annual tax planning meetings.
• Advise tax strategies for wealth transfer, estate planning, and cross-jurisdictional compliance.

• Review and sign off on federal and state income tax returns, and international filings (5471, 5472, 8858, 8865).
• Monitor legislative and regulatory developments (IRS, Treasury Reg.) and translate their impact for clients in practical terms.

• Contribute to internal knowledge-sharing initiatives, technical memos, and client-facing educational content.

• Drive business development through proposals, speaking engagements, and thought leadership content; collaborate with senior partners on strategic client initiatives.
• Law degree with a specialization in tax law (Avocat fiscaliste, Master 2 Fiscalité internationale, LLM in Taxation, JD with tax focus, or equivalent). Bar admission (French, U.S., or other jurisdiction) is a strong plus;
• 2-5 years of experience in tax advisory, ideally in a law firm, Big 4, or boutique international tax practice.
• Demonstrated expertise in U.S. tax matters, cross-border structures, and international tax frameworks
• Hands-on experience with equity compensation plans (stock options, RSUs) and their cross-border tax implications.
• Exceptional written and verbal communication skills - able to translate dense tax analysis into clear client advice.
• Highly autonomous and comfortable managing multiple complex engagements simultaneously in a fast-paced environment.
• Proficiency with tax research tools :
  Bloomberg Tax or CCH.
• French fluency is a significant advantage given our international client base;
  Spanish , German, or other European languages are a plus.