java English-speaking jobs in Mainz

The Leibniz Institute for Educational Trajectories seeks a Managing Director for the DFG Infrastructure Priority Programme "New Data Spaces for the Social Sciences". The Managing Director will coordinate processes, facilitate collaboration, and organize meetings for the program. The position requires a doctorate in a relevant subject area, strong facilitation and networking skills, experience in science communication, and knowledge of survey methods.

The Senior Quality Product Owner provides end-to-end ownership of all quality product-related activities, ensuring compliance, product availability, and patient safety. The role leads a product team, coordinates operations, and acts as the central escalation point for product-related topics.

Shape the virtual assembly line team, building solutions in Growth and Operations to scale products globally. Own feature development end-to-end, from problem framing to production deployment and maintenance. Build and integrate AI-powered product experiences using LLMs, agents, and tool-use patterns. Collaborate with product managers, designers, and engineers to ship features that move the needle for customers.

Working student supports financial accounting tasks including invoice processing, expense claims, vendor master data maintenance, and account reconciliations. Must have a Bachelor's/Master's Degree in Finance & Accounting or Business Administration and professional level written and spoken English.

Experienced MEP Site Manager needed for a data centre sub-station construction project in Frankfurt. Manage MEP activities, subcontractors, and ensure compliance with design, specifications, and regulations.

Own quality across Hero's Third Party Manufacturers (TPMs) within the EU portfolio. Approve, monitor, and manage TPMs to Hero standards, conduct audits, manage non-conformances, and investigate customer complaints. Implement quality systems with subcontractors and review/approve validation protocols and supplier quality documentation.

Do Well Do Good seeks Founding Partners to launch and grow their own consulting offices. Successful candidates will build client pipelines, deliver consulting projects, and achieve €500K revenue in Year 1. Full-time partnership and equity options are offered in Year 2.

Professor will teach and develop programs in International Business Relations, Global Market Entry Strategies, and Foreign Direct Investment. Requires a doctorate, professional experience, and teaching experience.

Senior Safety Engineer to support railway infrastructure projects. Develop and manage safety documentation, perform safety analyses, and support ETCS projects. Experience with CENELEC standards and ETCS signaling projects required.

Convince and win enterprise companies in Germany for a cloud-based meeting management solution. Present the company's vision to decision-makers and persuade them of the concept. Identify customer needs and create tailored proposals. Work with sales, product, and customer success teams to improve the sales cycle.

HSE Manager will implement and improve Eni's health, safety, environmental protection, and public safety policies. The role involves developing and maintaining the HSE Management System, supporting occupational health and safety, and monitoring performance indicators.

Develops and implements long-term strategic vision for microscopy business in Life Sciences and Pharma. Serves as strategic advisor to leadership, ensuring market trends, organizational strengths, and financial frameworks are integrated to promote growth.

Leads the development and execution of medical writing strategies for clinical research projects. Prepares, reviews, and edits clinical study documents, ensuring accuracy and compliance with regulatory guidelines. Collaborates with cross-functional teams to interpret and analyze clinical trial data and communicate findings.

This Executive Business Assistant role combines content-related project work with organizational and administrative tasks. Responsibilities include coordinating meetings, preparing materials, and providing onsite support during business travel. The ideal candidate has 2+ years of experience, excellent English and German language skills, and strong organizational and time management abilities.

Investment Associate to join a major international mid-market private equity firm in Frankfurt. The role involves active involvement across the full investment cycle, including evaluation, execution, and monitoring.

Provides embedded, on-site DHA Facility Database support at multi-specialist Military Treatment Facilities in the European Area of Responsibility. Maintains DHA Facility Database records across facility and room inventory, equipment, project management, and regulatory compliance modules. Collaborates with Facility Management Team, Operations and Maintenance staff, and DHA personnel.

Sales Assistant responsible for order processing, customer communication, and claim handling. Requires commercial education, relevant experience, strong English and MS Office skills, and ERP system proficiency.

Leads and develops a team responsible for the concept, implementation, and verification of algorithms processing radar raw data into digital signals. Drives the development of radar raw data processing features aligned with product strategies. Manages external sub-contracts and ensures compliance with R&D processes and standards. Requires a strong background in automotive ADAS sensor development, software development for radar processing, and radar technology.

System Engineer for Science and Planetary Defense Missions (m/f/d) will lead platform-level system engineering activities during Phase A/B1, coordinate technical inputs, and define mission and system architecture.

Service Technician responsible for the maintenance of electrical and mechanical systems, carrying out inspections, repairs, and component replacements on wind turbines. Must have completed vocational training in electrical engineering, electronics, or a comparable field and strong English skills.