java English-speaking jobs in Mainz

Experienced Tax Director sought for DACH region. Oversees tax compliance, reporting, and advisory activities across Germany, Austria, and Switzerland. Requires 15+ years of experience in corporate tax, including direct taxes, VAT, transfer pricing, and international tax frameworks.

Produce new business sales revenue via SaaS license model through account and territory planning. Develop C-suite relationships, advise on IT roadmaps, and orchestrate account strategy. Requires 7+ years of software sales experience.

System Engineer for Flight Management Systems requires analysis and design of FMS and Flight Guidance functions. Key tasks include developing formation flying and swarming functions, and managing V&V activities. Candidates need a degree in CS, Engineering, or Aerospace, and experience in IT or Aerospace.

As an Area Manager, you will lead a team to ensure site operations are safe, efficient, and meet customer demand. Responsibilities include driving productivity, analyzing performance, and standardizing processes. A Bachelor's degree and team leadership experience are required.

Strategic Core Account Executive for Automotive/OEM. Drive growth and close new business within large German automotive companies by shaping data and AI strategy. Requires proven enterprise sales success in the automotive vertical.

Doctoral Researcher position in innovation and organization within digital platform ecosystems. Requires a strong Master's degree in related fields, analytical skills, and interest in digital platform governance. Fully funded, part-time role.

Celonis seeks a Field CTO with 15-20 years of experience to advise C-level executives on technical strategies for Process Intelligence, Agentic AI, and Enterprise Modernization. This role requires deep experience in Enterprise Modernization, EA Methodologies, and Agentic AI, as well as the ability to translate complex technical visions to business value.

Lead Global Developer Engineering as Director of Engineering, Platform. Maximize engineering leverage by reducing complexity through a cohesive platform, overseeing unified developer platform and core infrastructure for 4,000+ engineers.

Field Coach Trainer will monitor client interactions, coach sales teams on performance and client experience, and deliver training programs. Requires 5 years of training & development experience in luxury retail, proven coaching skills, and strong communication abilities.

Senior Product Designer to shape the feel and function of a Data Platform. Own end-to-end user journeys, evolve the design system, and turn complex technical workflows into intuitive B2B experiences. Requires 7+ years in product design.

Own the product vision and roadmap for a two-brand, AI-native product in a competitive B2C market. Lead teams, prioritize ruthlessly, and drive user-centric outcomes through experimentation. Fluent in English and German.

Manages a EUR 1 billion investment portfolio, designs hedging strategies for commodities and currencies, and reports to the Head of Group Finance & Support. Develops and owns the annual investment strategy, manages asset allocation, and selects external asset managers. Establishes and develops a risk reporting framework, ensuring compliance with investment guidelines and regulatory requirements.

Senior Product Designer needed to shape financial services software. This generalist role covers UX research, user flows, and production-ready UI, leveraging AI in the design process. Requires 3-5+ years of experience and German proficiency.

Landscape Architect to help design resilient, liveable cities and open spaces. Support projects by preparing feasibility studies, concept, and detailed design for biodiversity-enhancing solutions. Requires a degree in a relevant field and several years of experience.

PhD position to develop a data-driven method mapping satellite data to ground-level air pollutant concentrations. The project integrates this into the EURAD-IM data assimilation workflow. Requires M.Sc. in related field, Python skills, and interest in atmospheric modeling.

Freelance Sports Production Manager to plan and execute immersive sports productions end-to-end. Manage timelines, budgets, and cross-functional teams in dynamic, high-pressure live environments. Requires 3+ years in sports/live event production.

Experienced CFD and Aerodynamics Engineers are needed to design and evaluate AI models using complex engineering tasks. Responsibilities include creating problem statements, developing scoring checkers, and using OpenFOAM. A degree in Aerospace or Mechanical Engineering is required.

Senior Staff Product Definition Engineer to drive the definition and roadmap of next-generation Ethernet PHY portfolios. This role bridges customers, R&D, and marketing to translate market needs into differentiated semiconductor products. Requires deep knowledge of Ethernet standards and 12+ years of relevant experience.

As a Customer Support Specialist, you provide empathetic, solution-oriented assistance to freelancers regarding banking, tax, and accounting. You bridge the gap between users, internal experts, and product teams. Native German and solid English skills are required.

Professor of Software Engineering responsible for module teaching, program development, and research. Requires expertise in software engineering, modern tools, and international experience.