Senior Tax Consultant

Company overview

Orbiss Inc. is a tax and accounting firm specializing in business growth in the United States. Launched in 2020, Orbiss has helped hundreds of small and medium-sized international companies scale up and thrive in the dynamic American market.

With a focus on personalized solutions, Orbiss offers fully tailored support for our clients’ cross-border tax, accounting, and consulting needs. Our vision is modernity, driving us to adopt an innovative approach that prioritizes process automation and quality assurance, while always keeping people at the heart of our mission.

At its core, Orbiss is an innovative, modern, young firm that believes an old industry can still learn new tricks. We prioritize the development of our people and are dedicated to guiding you through the learning process.

As a Senior Tax Consultant, you will be responsible for:

Tax Advisory & Planning Support

• 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.

Equity Compensation & Stock Options

• 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.

Client Relationship Management

• 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.

Compliance Oversight

• 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.

Team Leadership & Thought Leadership

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

Business Support

• Drive business development through proposals, speaking engagements, and thought leadership content; collaborate with senior partners on strategic client initiatives.

Requirements

If you have:

• 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 in a law firm, Big 4, or boutique international tax practice.
• Demonstrated expertise in U.S. inbound/outbound 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.
• Proficiency with tax research tools: Bloomberg Tax or CCH.
• French fluency is required given our international client base; Spanish, German, or other European languages are a plus.

Benefits

Did we mention Orbiss’s benefits?

• Health Insurance paid 100% with HSA and FSA available.
• 401(k) plan with a 100% match up to 6% after 3 months.
• Unlimited paid time-off policy (with a minimum of 2 weeks / year to be taken).
• Transportation program (Commuter Benefits offered).
• In-office breakfast in the morning, snacks in the afternoon and Happy Hour on Thursdays.

Last but not least, Orbiss is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected veteran status, age, or any other characteristic protected by law.