java English-speaking jobs in Mainz

Lead and develop procurement and logistics teams within a global matrix organization. Oversee end-to-end supply chain operations with international interfaces. Set and monitor OKRs and KPIs to control and optimize global value chains. Drive international cost-down initiatives and optimize the use of subregional supply chain resources.

Working Student Propulsion Engineer (m/f/d) will design and develop rocket engine subsystems and components. Responsibilities include translating system requirements, performing trade studies, and supporting engine integration and test campaigns.

NET CHECK GmbH seeks a Tools Support Coordinator to commission, install, and provide first-level support for measurement systems. Responsibilities include acquiring measurement data, supporting fleet management, and installing navigation systems. The ideal candidate has a technical understanding of Android phones, computers, and electronics, a valid driver's license, and proficiency in German and English.

Drive AI, Data & Analytics sales strategy within an allocated territory. Build AI-Ready visions with C-Suite personas and collaborate with cross-functional teams to deliver impactful solutions. Act as a trusted advisor for AI-Ready Data and present thought leadership at customer briefings and industry events. Lead the sales process end-to-end, from prospecting to closure.

Lead international revenue growth through strategic B2B sales. Win and grow major corporate clients into long-term partnerships. Build and manage a disciplined sales pipeline. Act as a trusted advisor, translating climate strategy into commercial value.

Experienced Chief Operating Officer needed for a high-growth Fintech company. Responsibilities include shaping business operations, ensuring client satisfaction, and managing IT units. Requires deep understanding of financial technology, software development, and risk mitigation.

Working Student for the Accounts Payable team will process travel expenses, verify transactions, and support accurate accounting practices.

YouLend is seeking motivated Account Managers to support new and existing customers applying for Merchant Cash Advance financing. Responsibilities include collaborating with merchants, managing applications, and achieving financing targets. The ideal candidate is goal-oriented, has excellent communication skills, and is fluent in German and English.

Working Student (f/m/d) Customer Experience & Consulting Support will assist in developing management summaries and presentations, contribute to conceptual questions in Customer Experience Management, and create and maintain HTML templates.

Freelance Machine Learning Engineer to design and develop computationally intensive problems requiring Python programming and non-trivial reasoning. Must have a Master's or PhD in a STEM field, 5+ years of Machine Learning experience, and advanced English proficiency.

Staff Software Engineer will drive reliability, quality, scalability, and efficiency of services within the Customer Logistics Choice Domain. Responsibilities include identifying architectural blockers, reliability risks, and cost leaks, determining solutions, and serving as a mediator on technical topics.

As a Staff Software Security Engineer, you will ensure application security throughout the software development lifecycle. You will embed security practices, conduct threat modeling, and lead secure code reviews. You will develop the application security program, conduct risk assessments, and provide security training and mentorship to developers.

Data Scientist to manage the operational data lifecycle, ensuring data quality, validation, and traceability. Analyze machine-generated data, drive performance insights, and curate training datasets. Collaborate with hardware, operations, and ML teams to improve system performance.

This paid internship provides hands-on experience in customer service operations within the Customer Service - Institutional Support division of Springer Nature. The intern will support libraries with licensed access to Springer Nature content, contribute to continuous improvement projects, and analyze customer service data.

Design and implement scalable backend services for an internal automation platform using Go (Golang). Build and maintain CI/CD pipelines, optimize developer experience, and develop RESTful APIs.

Supports the commercial renewal process by sending notifications, preparing quotes, and tracking responses. Communicates with customers to confirm renewals and provides necessary information. Identifies at-risk renewals and updates CRM systems.

As a Working Student in Quality Management – Operations, you will support the publication of brochures and products, ensure their quality, and handle technical issues. You will analyze data, identify irregularities, and collaborate with the team to improve processes.

BlueVoyant seeks an experienced Enterprise Account Manager to grow co-sell relationships with Microsoft Security Solutions and strategic resellers. Responsibilities include building relationships with Microsoft's Security Business Unit and field sales teams, developing and closing joint pipeline, and leveraging existing relationships to build new go-to-market opportunities.

Job Description As a Quantum Solutions Architect, you'll lead the technical track of the sales cycle with European customers, helping them evaluate, adopt, and engage with Classiq’s quantum software platform.

Senior Principal System Applications Engineer designs multi-channel digital receivers and transmitters for various markets including phased-array, radar, and satellite communication. The role involves developing hardware and software, analyzing signal chains, and guiding customers through system integration and testing.