java English-speaking jobs in Mainz

Freelance lecturer in Business Administration Sustainability needed for 48 teaching units starting July 1, 2026, in Berlin. Teach fundamental knowledge in sustainability frameworks, corporate sustainability management, and sustainability reporting. Design courses using provided materials and conduct practical teaching sessions. Requires a university degree in a related field, practical work experience, and English language skills at C1 level.

Evaluates and qualifies global supplier network for scalability, cost-efficiency, and sustainability. Develops improvements with suppliers to achieve growth targets. Analyzes supplier processes and implements measures to reduce risk and improve performance. Ensures supply chain compliance with regulations and standards.

PhD student to study microbial regulation of colorectal cancer development using mouse models, organoids, and sequencing technologies.

English-speaking educator to teach in a mixed-age learning group, collaborating with a German educator. Responsibilities include language instruction, working with parents, and organization. Must have experience with the Montessori method and fluency in English and German.

Product Manager for SAP Application Management Services will identify market trends, create managed services roadmaps, and design global services offerings. Responsibilities include end-to-end service offer management, product documentation, and providing product knowledge to internal teams.

Verus Libori Klinik seeks international psychotherapists with a Master's degree in Clinical Psychology to provide adult, child, and adolescent psychotherapy in a Black Forest clinic.

Experienced Warehouse Manager to lead day-to-day operations at a Berlin facility. Responsibilities include team leadership, process improvement, inventory management, and ensuring safety compliance.

Partner Success Manager for Germany will onboard and train new partners, build relationships, and support complex sales processes. The role requires a proven track record in Partner Success, Customer Success, Solution Engineering, or sales of complex software solutions. Fluency in German and either Dutch or English is required.

Conduct mathematical research in applied harmonic analysis, applied functional analysis, inverse problems, or machine learning. Develop software packages and publish research results. Contribute to teaching activities and supervise student assistants.

Senior Research Analyst and Portfolio Manager will conduct fundamental research on global technology companies, develop investment theses, and contribute to buy/sell decisions.

Lead and develop a B2B sales team focused on new logo acquisition across the DACH region and international markets. Drive revenue growth and implement scalable GTM strategies.

Junior Legal Counsel sought for Group Corporate Legal team. Supports corporate and regulatory matters, including contract review, governance, M&A, and compliance. Requires 1-3 years experience in corporate law and financial regulation. Fluent in English and German.

AI Research Engineer to design and develop novel model architectures and post-train foundation models for real-world applications. Requires strong ML research track record, expertise in modern architectures, and experience training large-scale models.

The Chief Financial Officer will partner with the CEO and Management Team to drive growth and business performance. Responsibilities include business planning, performance management, due diligence, budgeting, financial reporting, and providing commercial analysis.

Field Service Technician/Automation Specialist to maintain, troubleshoot, and commission automation equipment. Responsibilities include customer support, training, and documentation in German and English. Requires PLC programming experience (Siemens, Fanuc, Heidenhain) and a technical background. Frequent travel throughout Germany is expected.

This internship provides hands-on experience in event management and visitor experience design at Allianz Technology's R&D Center Europe. Assist with planning, coordinating, and executing events, including workshops, tours, and stakeholder meetings. Support guest management, create event materials, and collaborate with stakeholders and vendors.

Own the roadmap for Scalable Capital's market making solutions on the European Investor Exchange. Define, prioritize, and deliver innovative solutions, collaborating with Trading, Engineering, Operations, Compliance, and partners. Translate market research and user feedback into a cohesive product vision and user experiences.

The HR Director Europe leads the regional HR function, reporting to the CFO. This hands-on role focuses on the German market while overseeing broader European operations. The successful candidate will have significant experience in a senior HR role within a German-headquartered or German-focused international business.

Leads design, deployment, and system-level management of advanced network solutions focusing on automation and AI/ML integration. Drives automation and AI/ML-enabled capabilities across the architecture.

Part-time student software developer with a focus on game development sought. Develop interactive tools, prototypes, and visualizations. Support digital platform and software development.