java English-speaking jobs in Mainz

As Release Engineer / Technical Lead for AI/ML initiatives, you will ensure safe and compliant release of AI-powered software features into Ambu's Endoscopy Systems. You will drive technical maturation, integration, and release of AI software, own design control deliverables, and ensure compliance with relevant standards and regulations. You will collaborate with a global team to deliver innovative AI solutions.

PhD position at the Helmholtz-Institute Erlangen-Nürnberg for Renewable Energies focusing on the automated development of electrochemical catalyst inks and coatings. The role involves developing and optimizing catalyst inks, establishing characterization workflows, and collaborating with data scientists to develop a rapid material testing method.

Supports various Corporate Communications teams in areas including internal communications, public relations, content marketing, and social media management. Assists with event planning, research, analysis, and reporting. Maintains QIAGEN platforms and tools.

Riverty seeks a (Senior) Data Scientist to build Risk and Fraud machine learning models for online payment products. Responsibilities include data cleaning, feature engineering, model training, and evaluation. Requires a Bachelor's, Master's, or Ph.D. in a STEM field and 4+ years of experience as a Data Scientist. Experience with transactional databases, unstructured data, SQL, and Python is essential.

As a Senior Analyst - BCG Vantage focused on Airline Network Strategy & Planning, you will serve as a subject matter expert on airline network design, partnering with case teams and industry leaders to shape analytically rigorous, commercially grounded recommendations. You will design and evaluate airline network strategies, build network planning tools, and create executive-ready materials.

Perform aeroelastic load calculations for wind turbines, conduct stability analyses, and develop simulation models. Support product development phases and prepare technical documentation for certification.

UKD is renowned for its international excellence in patient care, research and teaching, as well as for innovative and safe diagnostics, therapies and preventive measures. Our patients benefit from the intensive interdisciplinary collaboration among 60 clinics and institutes.

BBIS seeks an energetic, internationally-minded teacher to teach IBDP/MYP Individuals & Societies to students in grades 6-12. Responsibilities include instruction, curriculum development, and fostering a safe and inclusive learning environment.

Lead Procurement and Supplier Management for the Packaging category. Engage with stakeholders across HARTMANN divisions to define and set supplier requirements. Drive category strategies, cost optimization initiatives, and long-term sourcing decisions.

Senior Application Engineer to support Siemens EDA Design for Test (DFT) products. Responsibilities include product presentations, customer evaluations, and design methodology support. Requires wide technical experience with large IC digital designs, DFT knowledge, and excellent communication skills.

Bilingual Sales Specialist (Spanish/English) will manage the full auction process, build client relationships, and research vehicle values. Must have prior sales experience, fluency in English and German, and proficiency in CRM systems.

Senior Cost Model Analyst supports value and cost engineering by building and maintaining cost transparency for offshore wind projects. Develops clean-sheet and should-cost models, benchmark databases, and analytical tools to enable informed decision-making and cost optimization.

Develop and operate ETL pipelines for reports, analysis, and machine learning. Optimize data engineering solutions for performance and scalability. Ensure data quality and consistency through validation and cleansing.

Design and automate UI and integration tests for electrical CAD software. Develop and maintain tests using established frameworks. Contribute to code reviews and identify software risks. Bachelor's degree in Computer Science or equivalent with 5+ years of experience as a Test Engineer. Strong knowledge of C#, UI testing frameworks, and integration testing frameworks. Experience with agile methodologies, code reviews, Git, and CI/CD. Excellent analytical and communication skills. English C1 required, German a plus.

This role is for an experienced 360° VR video editor/immersive post-production specialist who will own the full pipeline from rough stitch to final delivery. Responsibilities include stitching, color grading, 3D audio, and delivery. The ideal candidate has at least 2 years of experience in 360° VR post-production and is proficient in Mistika VR, DaVinci Resolve, and After Effects.

As OT Connectivity Engineer, you will ensure the reliable and secure connectivity of renewable energy assets across Europe. You will assess communication architectures, resolve connectivity challenges, and drive standardization for efficient monitoring and operation of PV, BESS, and hybrid assets.

Sales Executive to drive new business development and manage existing accounts for a clean power technology company. Fluent German and English required. Proven B2B sales track record in utilities, renewable energy, or electronics/electrical technology.

Manages sales, key accounts, and strategic clients in Bavaria. Analyzes market trends, ensures regulatory compliance, and mentors sales representatives. Requires experience with silicone implants and medical sales KPIs.

Financial Accountant needed for a part-time, fixed-term position. Supports the finance team in providing expertise and guidance for business models and practices.

Lead the development and construction of astronomical instruments or sub-systems for ESO's observatories in Chile. Projects contribute to answering key questions about the universe and our place in it.