java English-speaking jobs in Mainz

Develop and manage system designs for complex avionics or defense systems. Apply systems engineering methodologies across the full lifecycle, including requirements, architecture, and verification. Collaborate with interdisciplinary teams and customers.

Lead and develop a recruiting team for Sales & Operations roles across Germany. Execute recruiting strategy, advise senior leaders on people strategy, and drive cultural transformation initiatives.

The German Federal Pension Insurance Fund seeks an IT Specialist for Basic Services Infrastructure to join its cross-location team in Berlin or Würzburg. Responsibilities include monitoring, troubleshooting, and optimizing IT infrastructure components such as Active Directory, load balancers, and network security. The role requires several years of relevant IT experience, a university degree or vocational training in IT, and strong problem-solving skills.

The University Medical Center Göttingen seeks four Early Postdocs to develop research programs in Metabolic Plasticity. Applicants must hold a PhD (or equivalent) in a relevant field awarded within the past 5 years and have a strong research track record. Successful applicants will collaborate with a UMG department and receive funding for 3 years, with potential for extension.

Leads a multidisciplinary team in developing dental materials and delivery systems. Defines and executes technology platform strategy, drives innovation, and manages collaborations. Requires a PhD in a relevant field or Master's degree with extensive industry experience.

The Sr. Manager Office & Operations will oversee office facilities, vendor relationships, and administrative operations. Responsibilities include managing IT hardware, office equipment, and furniture, coordinating service providers, and collaborating with the US headquarters. The ideal candidate has experience in office management, facility management, procurement, and contract negotiation.

The Head of Communications leads BCI's global communications strategy, shaping the organization's public profile and messaging. This role oversees communications planning, media engagement, editorial content, and digital storytelling, aligning all outreach with BCI's mission and policy objectives.

Internship in High Precision Metrology for master's students in engineering, optics & photonics, computer science, physics, or similar. Develop optoelectronic laboratory prototypes based on simulations and experimentation.

Senior Full-Stack Developer (m/f/d) needed to integrate commercial software, design and develop backend and frontend applications, and ensure sustainable software architecture. Requires a degree in IT, experience in software development, and strong knowledge of Angular, Java, REST, Spring Boot, and Maven. Must have good written and spoken German skills (C1 level).

Design, build, and operate GPU-centric AI infrastructure for on-prem and cloud environments. Optimize compute, storage, and networking for large-scale AI workloads. Develop and operate infrastructure components like scheduling and resource management systems.

Senior Account Executives attract and sign new companies, managing the full sales cycle for enterprise clients (1,000+ employees) with an average order value of $300k ARR.

Intern to research e-Powertrain system architecture, housing & cover parts manufacturing, and EDU supply-chain in Europe. Requires a college degree in Engineering, Catia V5 skills, and 3+ years of automotive industry experience.

Leads the Internal Audit function, providing assurance and consulting services to improve organizational operations. Develops and executes a risk-based audit strategy aligned with organizational objectives and regulatory requirements. Manages SOX 404 testing and compliance, and leads a high-performing audit team.

Lead IoT Solutions Engineer will design, build, and integrate IoT devices for commercial or industrial applications. Responsibilities include hardware integration, Linux-based systems management, edge computing deployment, data analysis, and project management.

Support IT budget planning, management, and auditing. Create and optimize reports, contribute to procurement, and ensure data quality.

Leads the consumer experience roadmap, aligning UX choices with business outcomes. Translates UX into measurable results, partnering with Finance and Marketing to drive product decisions tied to unit economics. Leads cross-functional teams, fostering a test-and-learn culture. Requires 8+ years of experience building consumer software at high-growth tech companies with a proven track record of launching products that moved metrics.

CTOP GmbH seeks a System and Network Administrator to support, maintain, and develop IT systems and networks for clients. Responsibilities include network management, administration, and troubleshooting, as well as planning and implementing new IT solutions. Candidates should possess an IT-related degree or equivalent experience, strong network knowledge, and excellent communication skills.

Support the Analytics team in calculating KPIs, creating visualizations, and providing data-driven insights. Clean, explore, and transform data to ensure data quality and availability. Collaborate with developers and analysts to improve products and data infrastructure.

Ensures molecular and particulate cleanliness for components used in electron microscopes. Develops, optimizes, and qualifies cleaning processes for sensitive surfaces. Implements and maintains contamination-control standards and procedures. Performs surface analysis using various techniques and leads root-cause analyses.

Support the Assembly Technology department as a Volunteer for International Experience (VIE) in Hamburg. This 24-month role involves supporting the Assembly Technology Innovation Team in Manufacturing Engineering. Tasks include organizing demonstrators, running test campaigns, and working with metrology equipment.