java English-speaking jobs in Mainz

The Research Laboratory Molecular Child Psychiatry at the Carl von Ossietzky University of Oldenburg seeks a Research Associate to conduct molecular and cellular biology experiments. Responsibilities include planning, performing, and evaluating experiments, analyzing data, preparing manuscripts, and supervising students. Applicants must have a Masters degree or equivalent in a relevant field and a PhD in molecular psychiatry, neuroscience, or a related field. Practical experience with molecular biology techniques and statistical analysis is required.

Part-time Payroll Specialist DACH (m/w/d) to coordinate monthly payroll for German entities, with potential for supporting Austria. Requires demonstrable experience in German payroll processing, knowledge of DACH employment law, and fluency in German and English.

Manages sourcing and purchasing activities across EU markets. Identifies and develops suppliers, negotiates contracts, and ensures supply continuity. Collaborates with cross-functional teams to support procurement strategy and cost reduction initiatives.

Leads the Underwriting Transformation team, driving the global implementation of Allianz Commercial Underwriting Transformation strategies. Oversees people, process, and technology changes to enable effective transformation. Collaborates with stakeholders across various departments to prioritize initiatives, monitor change capacity, and steer delivery. Ensures an integrated, efficient, and effective approach to navigating the organization's complex landscape.

Senior Business Implementation Analyst will analyze energy trading activities and new products, translate business requirements into technical solutions, and coordinate implementation with business departments.

Deliver parcels using company vehicles, including electric vehicles. Sort and prepare shipments for delivery routes. Must have a valid Class B driver's license and be able to communicate in German.

Design and implement gameplay systems for a mobile F2P game. Build and iterate in Unity, using player data to improve the experience. 3+ years F2P mobile design experience required.

Leads the foundational layer of HighLevel's product stack, including infrastructure platforms, automation capabilities, CRM primitives, and shared systems. Manages a team of 25-30 product managers and drives strategy, execution, and org design for a portfolio that underpins core product functionality.

The Nutriment Company seeks an experienced Head of Supply Chain & Planning to build and lead supply chain planning for Western Europe. This newly created role involves building a Sales & Operations Planning (S&OP) process, managing inventory and out-of-stock situations, and overseeing day-to-day supply chain operations.

Experienced Legal Counsel (m/f/d) to provide legal support to EMEA businesses. Draft, review, and negotiate contracts, manage legal disputes, and support corporate governance. Must be a qualified German lawyer with 7+ years' experience, including 3+ years in-house. Fluent English and German required.

Freelance Project Manager to oversee planning, execution, and delivery of a Green Steel Plant project.

Experienced Delivery Manager needed for complex aeronautics/defense projects in Hamburg. Lead project teams, manage client relationships, and optimize processes. Minimum 5 years project management experience required, fluency in English and German.

Freelance annotators review and classify text, images, or videos to train AI models. Projects may include rating content, evaluating accuracy, or identifying sensitive material. Requires a bachelor's degree, 1+ year of professional experience, advanced English proficiency, and strong attention to detail. Compensation is project-based and up to $22 per hour.

Travelcircus seeks a Junior Backend Engineer to build and extend platform services and booking systems. Responsibilities include designing, developing, and maintaining a transactional API platform, using AI tools, and improving the existing codebase. Ideal candidates have experience with PHP, API development, and service-oriented architectures.

Shape the development of a globally aligned quality organization and support sustainable international growth. Define and drive the global quality strategy for the Thermal Solutions Business Unit, establish a unified quality framework, and harmonize quality systems, processes, and standards. Drive the digital transformation of quality management processes and manage global quality KPIs.

Lead strategic engagements with CIOs and senior executives, guiding them through strategy execution and transformation. Drive business development, account growth, and margin improvement across a portfolio of strategic accounts in the Manufacturing, Consumer Goods, Retail & Utility sectors.

Working Student Events & Recruiting to support recruiting, employer branding, and event management. Responsibilities include candidate sourcing, event coordination, and content creation. Must be enrolled in a university and fluent in German and English.

The Chief Scientific Officer (CSO) for Advanced Staining leads the scientific strategy for IHC, FISH, and next-generation tissue-based diagnostic technologies. This executive role shapes innovation strategy, oversees R&D execution, and ensures global leadership in advanced staining and translational pathology solutions.

SAP Service Manager responsible for global application support of ERP and ancillary systems, including FI/CO modules. Manages service tickets, change requests, and escalations. Collaborates with internal and external resources to ensure smooth business operations. Requires a Bachelor's Degree in Information Technology or a related field and profound experience in SAP Service Management, specifically FI/CO modules.

Technical Safety Instructor to oversee and teach safety courses in Bremerhaven. Full training provided. Must hold a relevant safety qualification (e.g., HUET, Sea Survival), have transferable industry experience, and be fluent in German and English.