java English-speaking jobs in Mainz

Experienced Project Manager to lead utilities projects for data centre development. Proven track record across full project lifecycle, including feasibility to delivery. Experience in data centre or mission-critical projects is highly desirable.

Lead the budgeting, forecasting, and long-range planning processes for a fast-growing tech services business. Develop financial models to support growth, pricing, and investment decisions. Provide commercial insight to the Board and senior stakeholders.

Design Engineer to develop technical designs for AC and DC EV charging systems in Germany. Responsibilities include electrical design, compliance with German regulations, and collaboration with stakeholders. Requires a degree in Electrical Engineering, AutoCAD proficiency, and experience with electrical system design.

HSE Advisor needed to promote safety culture, implement SHEQ standards, and ensure compliance across construction projects. Requires SHEQ qualification, knowledge of ISO management systems, and experience in construction sector. German language skills required.

PhD position in Molecular Infection Biology at the Institute for Molecular Pathogenesis. Research focuses on host defense factors and bacterial pathogens. Requires M.Sc. in a related field, research experience in molecular biology, cell biology, and biophysics, and fluency in English.

Senior Product Manager will design and execute data-driven growth strategies for a B2B cross-border e-commerce platform. Responsibilities include A/B testing, digital marketing channel management, and strategic partnerships. Requires 5+ years of experience in user growth, preferably with B2B platforms or SaaS products in the European market.

Drives profitable revenue growth by identifying, qualifying, negotiating, and closing new business opportunities for Sphera's EHS&S software solutions in the DACH region. Focuses on selling to Enterprise accounts and hunting new business. Requires 5+ years of experience selling Enterprise Software and Technology solutions to the Global 2000. Fluency in German and English is essential.

Data Scientist will develop software and machine-learning algorithms for biopharmaceutical formulation development. Conduct molecular modeling analyses and provide scientific advice. Requires a Master's degree in a relevant field and strong Python and data analysis skills.

Support the planning, organization, and implementation of Bits & Pretzels 2026, a leading startup conference. Assist with customer satisfaction, stakeholder management, and event flow. Contribute to the further development of the conference and post-event evaluation.

Experienced HR Manager needed to lead complex employee relations, workforce planning, and compensation strategies for a global CRO. This senior role supports a large employee population in Germany and Switzerland and requires expertise in German labor law and Works Council processes.

Data Analyst to support supply chain transformation initiatives for a semiconductor company. Analyze, cleanse, and migrate supply chain data to Oracle E-Business Suite (EBS). Experience with data analysis, data migration, Oracle EBS, and ETL tools required.

Data Engineer will connect and extract data from project systems, clean and structure datasets, and build dashboards to provide project insights.

Recruiter to support the growth of KFC in Germany. Responsibilities include sourcing, screening, interviewing, and negotiating for restaurant management and head office positions. Must have 2+ years of recruitment experience, strong knowledge of recruitment methods, and fluency in German and English.

Project Engineer will lead on-site construction activities, ensuring quality delivery aligned with client procedures, safety standards, and project objectives. Responsibilities include managing contractor interfaces, supervising site activities, and supporting project planning and design coordination. Requires 10-15 years of construction supervision experience, a relevant trades qualification or engineering degree, and fluency in English.

Vetting Manager supports a modern tanker fleet operating in the chemical, product, and gas sectors. Responsibilities include preparing for and accompanying SIRE 2.0 and CDI inspections, managing post-inspection responses, and promoting safety culture onboard vessels. The ideal candidate has tanker knowledge, shore-based experience in vetting, HSSEQ, or operations, and fluency in German and English.

The Deutsche Bundesbank seeks a Test Analyst to shape the functional development of digital central bank money (wCBDC). The role involves analyzing requirements, translating them into solution concepts, and supporting implementation. The Test Analyst will also contribute to project management, stakeholder coordination, and test/validation processes.

Provide legal support for the German market, including contract adaptation and process alignment with the Group's framework.

The University of Bonn seeks a W2 Professor for Mathematics in Medical Sciences to establish an internationally visible research group in mathematical modeling. The position is a five-year temporary appointment. The successful candidate will have international research experience, scientific independence, and a strong research background at the interface of applied mathematics and theoretical life sciences.

The Liner Operations Coordinator optimizes shipping processes and space utilization. Responsibilities include negotiating vessel space arrangements, coordinating loading plans, and managing operational events.

Junior Professional Services Consultant to support the implementation of Impress and e-Services solutions. Will work with customers on onboarding and solution setup, providing support and collaborating with internal teams.