Job description Location : Basel Work Pattern Percentage : 80-100% Advance your career where Global Mobility drives strategic impact In Global Employer Services, we support internationally mobile employees and executives as they work across borders. Our work ensures that individuals sent on assignments abroad, relocating to Switzerland, or working across multiple countries remain fully compliant with tax and social security regulations—both locally and internationally.As a Senior Tax Consultant, you will focus on Swiss Individual Tax, working within a high-impact team to deliver comprehensive, tailored solutions that address the complex needs of our global clients. You will be entrusted with increased ownership and responsibility, leading client engagements, mentoring junior colleagues, and contributing to the development of innovative tax strategies. Your expertise will be instrumental in shaping client success and driving the growth of our practice. Your responsibilities You will have the opportunity to take ownership from day one, to be involved in client-facing activities in the field of Swiss tax. You will be the primary driver of a client engagement team, steering tax compliance delivery, managing engagement finances, and providing regular outcome and risk reports to the manager to ensure client‑centric and efficient execution. You will also integrate, mentor and develop junior team members. You will lead and manage Swiss and international tax compliance projects, including review of Swiss tax declarations and analyze complex international tax and social security positions. You will review advice tailored to each client, supported by thorough research and up-to-date knowledge of Swiss and international tax laws. You will further develop specific knowledge in Swiss national and international tax. Combine your strengths with the know-how of our experienced teams to unlock your full professional and personal potential, supporti