java English-speaking jobs in Mainz

Designs, develops, and implements control systems for semi-automated to fully automated assembly equipment used in co-packaged optics assembly. Collaborates with internal and external teams to align and transfer product and process requirements. Runs assembly processes and pilot lines for new products.

Develop and manage key accounts across refineries, green steel, utilities, EPC, and industrial hydrogen sectors. Drive business development and strategic partnerships to advance PEM electrolysis. Requires relevant degree and sales experience.

Senior Accountant - Accounts Payable supports the Shared Service Center by processing supplier invoices in SAP. Responsibilities include coding, verifying, and reconciling financial data while maintaining compliance. Requires German (min. B1) and English (min. B2).

Design and develop aero engine components and complex assemblies. Create technical solutions using conventional and Model-Based Definition methods. Manage work packages in an agile environment, ensuring robust engineering solutions.

Seat Structures Engineer responsible for certification activities for aircraft seating products. Duties include FE calculations, structural substantiation, and serving as a Boeing representative for engineering and certification topics. Requires a relevant Bachelor's degree and 5+ years of aerospace experience.

Validate Ethernet physical layer hardware, reproduce and root-cause defects, build and maintain test setups, and collaborate with development teams to drive quality improvements.

Healthcare Account Executive manages the medical provider network in Germany. This role involves managing provider relationships, overseeing the provider lifecycle, ensuring compliance, and driving performance with senior stakeholders. Requires proficiency in English and German.

Sales Stylist at LS&Co. delivers exceptional 1:1 service, sharing styling advice to help customers express themselves. Responsibilities include supporting store operations, visual merchandising, and achieving sales goals.

Vice President, Client Partner for Consumer & Services. Shape strategic account relationships across retail, CPG, travel, and hospitality. Advise C-level stakeholders on technology strategies and drive revenue growth. Requires 15+ years of experience and German/English fluency.

Design and deliver virtual/onsite learning activities, manage e-courses on LMS, and coordinate learning outreach. Requires 5+ years experience in L&D, instructional design, and fluency in English and French.

Sell a digital glare analysis tool for PV systems across Europe. Identify and approach B2B clients like developers and consultants. Run demos, close sales, and provide market feedback. Requires native language skills and B2B sales experience.

Design and execute test plans for full-stack features, covering UI, API, and database layers. Write functional test cases and build automated UI/API tests. Collaborate to ensure quality from execution to release readiness.

Director Business Development drives strategy and client retention within Oncology, Internal Medicine, or Neuroscience. Responsibilities include identifying sales opportunities, managing negotiations, and coordinating business development staff. Requires 5+ years of clinical research/sales experience.

Lead a multidisciplinary team to deliver a strategic, large-scale data center project from initiation to handover. Requires a degree in a relevant engineering discipline and extensive experience managing complex projects over €500 million.

Seeking a Cyber Security Manager to join a major IT carve-out and transformation program. This role supports the development of an independent, service-oriented, and future-ready IT organization.

Lead Veloq's commercial push in Europe, owning revenue targets and closing major enterprise customers. Drive sales of warehouse automation and fulfilment software to grocers, retailers, and 3PLs.

Senior Director, DACH, leads CoreWeave's commercial strategy across Germany and the DACH region. This role owns regional strategy, revenue, and builds the sales organization to scale AI cloud adoption.

Design, build, and test hardware for space infrastructure combining AI computing with laser and RF communications. Focus areas include digital, analog, RF, and power electronics. Requires 3+ years in complex electronic hardware development.

The Business Unit Industrial Engineer implements business improvement initiatives for manufacturing lines, focusing on waste and productivity. This role leads projects using Lean and/or Six Sigma principles to drive financial performance.

Manage monthly payroll with precision, ensuring compliance with tax, social security, and company policies. Serve as the payroll expert, handling master data, regulatory reporting, and cross-functional coordination.