java English-speaking jobs in Mainz

Junior Economist will analyze and model German housing markets, focusing on resale, rental, and new build dynamics. Responsibilities include producing market indicators, performing statistical and econometric analyses, and translating insights into actionable content and tools.

Develops global forestry machinery market strategy, conducts market research, and formulates product R&D plans. Leads product development, ensures timely delivery, and manages key product technology. Transforms customer requirements into design specifications and optimizes product performance. Provides technical guidance to global R&D teams and assists in establishing R&D, standards, and testing systems.

Experienced SAP SuccessFactors Employee Central Consultant needed to support a global HR systems transformation. You will design, configure, and enhance Employee Central, translating business requirements into scalable solutions. Strong collaboration and communication skills are essential.

Human Resources Business Partner to lead all People & Culture matters for the German business (c. 380 staff). Responsibilities include oversight of strategic and operational P&C matters, employee relations, and the full employee lifecycle. Expert-level knowledge of German labor law, Betriebsverfassungsgesetz (BetrVG), and Tarifverträge required.

Develop and manage international key accounts in the data center segment, building and maintaining long-term customer relationships at the C-suite level. Co-develop and implement the central segment strategy for data centers, developing go-to-market strategies and use cases. Build and maintain an internal cross-country data center community to foster knowledge exchange and synchronize activities.

Specialist Product Engineering role focused on technical documentation, product modifications, and collaboration with development, production, and sales. Requires technical training, experience in documentation, and proficiency in German and English.

Leads the global Science Expert function, defining scientific strategy, managing subject matter experts, and ensuring alignment with organizational goals.

Experienced Business Consultant needed for enterprise transformation initiatives. Drive governance and process optimization, facilitate workshops, and support stakeholders in implementing sustainable data management frameworks.

Process Planner / Production Planner (m/f/d) for a full-time position (35 hours/week) with experience in the automotive sector. Responsibilities include planning, optimizing, and industrializing manufacturing and assembly processes. Experience in the Mercedes-Benz environment is desirable.

The Product Risk Director defines and executes the strategic vision for risk and fraud capabilities across Paysafe's payments ecosystem. This role partners with Risk, Compliance, Engineering, Data Science, and Commercial leaders to deliver scalable, data-driven risk solutions. The Director owns the end-to-end risk product portfolio, ensuring alignment with company objectives, regulatory requirements, and market needs.

The Managing Director Germany leads and scales the German Business Unit, reporting directly to the CEO. Responsibilities include P&L management, new business development, client relationship management, team leadership, and operational performance.

Experienced HR Business Partner to provide strategic consulting and support for managers on personnel management and employment law topics. Develops and manages HR processes, projects, and collaborates with management on transformation initiatives.

Senior Optical/Laser Development Engineer will design, build, and test laser systems for trapped-ion quantum computers. Collaborate with physicists, electronics, and software teams to integrate modulation control and single-photon processing.

Project Control Engineer needed for a hydrogen infrastructure project near Düsseldorf. Manage project planning, scheduling, cost control, and performance reporting. Fluency in English and German required. Minimum 3 years of experience in project control in industrial or infrastructure projects. Proficiency in Primavera P6, MS Project, Excel, and ERP systems.

Site Administrator required for project in Frankfurt, Germany. Provides administrative support, manages site correspondence, tracks labor, plant, and materials, and assists with health and safety documentation. Requires 1-3 years' experience, fluency in German and English, strong organizational and IT skills.

Plans, coordinates, and implements projects within budget, timeline, and scope. Monitors and presents project updates to stakeholders, clients, and team members. Leads the entire robot project process, from initiation to delivery. Communicates customer needs and translates them into feasible solutions.

Provides technical support for overseas energy storage projects, including pre-sales assistance, on-site commissioning, and post-sales issue resolution.

The Project Manager leads hyperscale data center projects from site identification through construction readiness. Responsibilities include project governance, stakeholder management, budget and program development, and ensuring projects are fully defined and de-risked prior to construction. The role requires a strong understanding of the full project lifecycle and the ability to collaborate with internal and external teams.

As Technical Transaction Advisor, you will ensure renewable energy investments are based on robust technical foundations. You will bridge the gap between engineering, investment, and external advisors, translating complex technical topics into clear decision-making input.

The Business Applications Developer will design and implement a platform for managing research dataset applications, including submission, review, and approval processes. The Developer will leverage Microsoft 365 and Power Platform to develop integrated solutions, ensuring security, governance, and compliance.