Global Mobility Tax Manager (1)

Muehlhan; Porto; Hybrid; EUR 90,000 - 140,000; Full time

Benefits offered by this job

Health insurance

Employee Assistance Program

Flexible working arrangements

International exposure

Training & development

Team events

Meal allowance

Free snacks

Job summary

Muehlhan Wind Service is seeking a Global Mobility Tax Manager based in Porto, Portugal, to lead payroll-tax, social security, and compliance for international deployments within the Muehlhan Group. The role reports to the Global Head of Tax and requires 50–60 travel days annually across Europe and the Americas.

The GMTM owns processes, systems, and implementation, with external local advisors providing country-specific expertise.

Qualifications

• 10+ years of Global Mobility Tax or expatriate taxation experience.
• Strong knowledge of international taxation and Double Tax Treaties.
• Experience with cross-border payroll and social security.
• Experience managing external advisors and service providers.
• Business-fluent English; second language is a plus.

Responsibilities

• Oversee Mobility Tax functions and coordinate with Group colleagues.
• Propose and implement system landscape, automation, and standardization across Mobility Tax.
• Lead and roll out a Tax-as-a-Service model in Mobility Tax area.
• Travel 50–60 days per year, mainly in Europe and the Americas (mandatory).

Skills

Global Mobility Tax

Expatriate taxation

International wage/payroll tax

Social security

Tax technology

Automation

English

Job description

Join Us in Powering the Future of Renewable Energy

Are you passionate about green energy and looking to be part of a dynamic, fast-growing international organization?

At Muehlhan Wind Service, we are driven by a shared ambition to support the global energy transition. Through the expertise, dedication, and commitment of our people, we deliver high-quality solutions that contribute to lowering the cost of green energy worldwide.

If you are looking for an opportunity to make a real impact, work alongside talented professionals, and grow your career in a thriving and purpose-driven environment, Muehlhan Wind Service could be the place for you.

About the role and key responsibilities

The Global Mobility Tax Manager (GMTM), based in our office in Porto, is responsible for all payroll-tax, social security and related compliance matters arising from the international deployment of employees within the Muehlhan Group. The role is part of Group Global Tax Department and reports to the Global Head of Tax.

The GMTM owns processes, systems, implementation and results. External local advisors provide country-specific technical expertise.

The chosen candidate must have the availability to travel 50-60 days per year, mainly in Europe and the Americas (this is a mandatory requirement).

Skills, Knowledge and Experience

Organization & Processes

From day one: oversight of the two existing Mobility Tax functions and involvement of the relevant colleagues.

Proposals, implementation and roll out system landscape and process automation within the Mobility Tax area.

Implement Group-wide “Tax-as-a-Service” in Mobility Tax area.

Technical Scope

• Individual employee income tax, tax residency and Double Tax Treaty matters;
• 183-day rules and economic employer considerations;
• Cross-border payroll, wage tax, social insurance and shadow payroll;
• A1 certificates, social security and Certificates of Coverage;
• Posted Worker and related mobility compliance;
• Business traveler’s and international project deployments;
• Identification and escalation of permanent establishment risks;
• Management of external tax and mobility advisors.

Profile:

• >10 years of strong experience in Global Mobility Tax, expatriate taxation, international wage/payroll tax or social security;
• Strong knowledge of international individual taxation and Double Tax Treaties;
• Strong practical experience with cross-border payroll and social security;
• Track record in process standardization, tax technology and automation (ideally using AI);
• Hands-on mentality: Takes ownership, acts quickly, follows up until completion;
• Experience managing and challenging external advisors and service providers;
• Business-fluent English (C1, proven) is a must; third language is an advantage;

What we offer

• Health insurance and Mental Health Support
• Employee Assistance Program (Workplace Options)
• Flexible working arrangements
• International exposure within a dynamic and fast-growing environment.
• Continuous training and development
• Regular team-building activities and celebration events
• Meal allowance (paid in meal card)
• Free fruit, snacks and soft drinks in the office
• Gifts for special occasions (Birth, Christmas and round work anniversary)

Muehlhan Wind Services is committed to creating an inclusive and diverse workplace. We welcome applications from all qualified candidates and make employment decisions without regard to race, religion, gender, age, disability, sexual orientation, or any other protected characteristic.

About Muehlhan Wind Service

Muehlhan Wind Service (MWS) is a world-leading, full-scope independent service provider, specializing in wind turbine installation and Operations & Maintenance solutions global wind energy clients.

Headquartered in Fredericia, Denmark, MWS is part of the Muehlhan Group, an international industrial services company based in Hamburg, Germany. With operations spanning multiple countries and business units, we deliver specialized solutions across the entire lifecycle of wind energy assets, both onshore and offshore.

Our expertise covers a wide range of services, including onshore and offshore installation, high-voltage and electrical services, blade inspections and repairs, statutory inspections, main component exchange, paint, special projects, manpower solutions, welding repairs, and more.

At Muehlhan Wind Service, our people are at the heart of everything we do. We are proud to foster a collaborative, international, and safety-driven environment where talented professionals can grow, make an impact, and contribute to the global transition towards renewable energy.

If you are passionate about working in a dynamic industry and want to be part of a team that is helping shape the future of sustainable energy, we would love to hear from you.

For more information, please visit www.muehlhan.com.

Location: Porto, Portugal

Start Date: 2026 or early 2027