java English-speaking jobs in Mainz

iOS Developer responsible for app delivery and maintenance aligned with product roadmap. Requires 5+ years of iOS development experience, strong Swift knowledge, and understanding of design patterns and CI/CD processes. Experience with GitLab, SPM, Firebase, Jira, Confluence, and Bluetooth LE technologies is beneficial. Must be located in Germany and proficient in English.

Lead User Experience Researcher (VP) will design and execute research studies to identify customer needs and behaviors for a new digital bank in Germany. Collaborate with product leadership and leverage expertise in UX research and the German banking landscape.

As Senior Patent Manager, you will develop and execute a patent strategy to protect Q.ANT's photonic processing breakthroughs and secure a sustainable competitive advantage. You will identify, prioritize, and manage the international patent lifecycle, conduct Freedom-to-Operate analyses, and foster an IP-aware culture within the company.

The Werkstaettenleiter is responsible for the 6981st Motor Operations & Maintenance Branch, overseeing repair and maintenance of vehicles, equipment, and tools. The incumbent ensures vehicles are certified for transporting dangerous property and manages a team of mechanics. Responsibilities include planning and programming maintenance, analyzing maintenance trends, and coordinating repair requests. The position requires technical proficiency in vehicle and equipment repair, knowledge of maintenance policies and regulations, and experience in managing a team.

HR Business Partner will implement and develop global HR strategy at local level in French locations. Support and develop teams, ensuring compliance with local regulations. Manage recruiting activities and support training needs. Provide counsel to employees and managers on various HR matters.

The Fraunhofer Institute for Integrated Circuits IIS seeks a Managing Director for the mioty® program. This role is responsible for global strategic development, commercialization, and ecosystem expansion of mioty®, a leading Low Power Wide Area Network (LPWAN) standard. The Managing Director will lead operational, business, partnership, and organizational activities to establish mioty® as a leading LPWAN technology.

Information Security Manager will establish and develop the ISMS according to ISO 27001, conduct security awareness programs, perform risk management, and support audits.

Product Manager responsible for driving commercial success of loaders and backhoes throughout their lifecycle. Develops product strategy, collaborates with R&D and Sales & Marketing, and tracks product performance. Requires a bachelor's degree, 2-4 years of product management experience, and industry knowledge.

Global Trade Compliance Analyst ensures adherence to International Trade Law and local regulations at AbbVie's French Manufacturing facilities. The role supports other EU sites with compliance activities, manages import/export operations, and analyzes trade metrics.

Lead Solutions Engineer will provide technical consultation to prospects and customers in Germany, supporting sales and channel goals. This role requires strong technical, business, and customer skills, and experience with ITSM/ITIL Methodologies and cloud based infrastructure.

Lead a team of 6-7 experienced backend engineers in a fast-scaling tech company. Contribute to system design, architecture, and code when needed. Manage performance reviews, hiring, and development.

Investment Manager to lead operational transformation and performance improvement programs within portfolio companies. Responsibilities include steering transformation initiatives, collaborating with management, and ensuring successful project execution. Requires several years of experience in restructuring, reorganization, or performance improvement roles, strong analytical and communication skills, and fluency in German and English.

Support EEG and fNIRS data acquisition, quality control, and curation for neuroscience research. Develop data processing workflows, implement quality metrics, and prepare datasets for AI-driven analysis.

Senior Recruiting Manager will own the full recruiting lifecycle, from sourcing to closing, for a fast-growing FinTech in Berlin. You will build teams, conduct structured interviews, and improve recruiting processes. Several years of recruiting experience, strong active sourcing skills, and German fluency are required.

Postdoctoral fellow to investigate how mechanical forces influence cell extrusion in epithelial tissues. Focus on cell fate, mechanosensing, and tissue remodeling. Expertise in cell biology, microscopy, and biophysics required.

As a Working Student – Finance & Operations, you will support the financial and operational backbone of GreendaAI during its growth phase. You will assist with financial reporting, invoice management, cash flow monitoring, and process improvement.

Senior Director will lead transaction tax teams across Germany, Europe, and globally, advising on buy-side and sell-side transactions, including tax due diligence reports and transaction structuring.

As a Founders Associate – Sales & Business Development, you will work directly with the founder to build and scale strategic partnerships. You will support and gradually own high-impact enterprise business development initiatives, structure deals, and ensure execution across the sales lifecycle. This role is designed as a development track into a Business Development Manager position.

Senior controller (m, f, d) required for private markets. Responsibilities include controlling reports, loans, distributions, and NAV calculations. Requires a Master's or Bachelor's in Accounting, Audit, or Tax, with experience in private equity investments and IFRS knowledge.

QA Specialist for Microsoft Dynamics 365 Business Central. Execute test plans, document defects, and provide functional support. Must have 2+ years of hands-on experience with BC, strong problem-solving skills, and excellent written and spoken English.