freelance English-speaking jobs in Wuppertal

Research Assistant (m/f/d) to work on microstructuring of optical materials for integrated photonics, waveguide lasers, optical frequency conversion, and optomicrofluidics. Responsibilities include independent design, fabrication, and experimental investigation of microfluidic systems based on lithium niobate.

This part-time evening sorting position involves loading, unloading, shipping, receiving, scanning, sorting, and stocking packages. May utilize heavy machinery. Requires ability to lift up to 70 lbs., read and memorize postal codes, and work flexible hours. Warehouse experience is preferred.

Develop and validate cleaning processes for semiconductor components. Conduct surface analyses and drive root cause investigations for contamination issues. Lead supplier qualification and audits.

Experienced Executive Assistant to support a founder in a fast-paced AI infrastructure company. Responsibilities include calendar and travel management, problem-solving, process improvement, and project coordination. Requires strong organizational skills, experience supporting senior leadership in a startup environment, and fluency in English and German.

Senior Research Engineer to design, build, and deploy LLM-based systems and agentic workflows. Focus on turning prototypes into reliable, scalable, and measurable systems. Strong Python fundamentals and experience with LLMs, NLP, or Generative AI systems required.

Manages end-to-end production of seasonal assets for e-commerce platforms, including marketing content. Collaborates with creative and production teams to ensure smooth operations and high-quality asset delivery. Develops and implements process improvements, including new scheduling processes and templates. Liaises with stakeholders across Marketing & Consumer, Creative departments, and external partners.

REPLUG seeks a Content & Inbound Marketing Specialist to execute marketing strategies. Responsibilities include content creation, repurposing, and distribution across platforms, managing content calendars, and supporting social growth and PR/outreach. Must have 2+ years of marketing experience, strong B2B exposure, and excellent written and spoken English.

Lead and mentor a team of developers, driving architectural decisions and coding standards. Design, develop, and maintain scalable web applications, architecting complex systems for reliability and security. Conduct code reviews, develop automated tests, and collaborate with teams to deliver high-quality solutions.

Support the lead designer in creating visual assets for social media, newsletters, web content, and print materials. Assist in developing sales brochures, marketing collateral, and event signage.

Site Finance Manager will lead financial operations at the AMB site, ensuring compliance with corporate policies and driving business performance. Responsibilities include financial close, reporting, statutory audit, budgeting, forecasting, and leading a finance team.

Provides strategic and operational support to two Co-CEOs & Co-Founders. Manages complex calendars, prioritizes tasks, and acts as a central point of contact for stakeholders. Prepares presentations, manages communications, and supports project implementation.

Freelance English tutors (m/w/d) are needed for online and in-person lessons across Germany. Support students with grammar, speaking, writing, and exam preparation. A completed higher education and strong English skills (C1/C2 preferred) are required.

The International Research Training Group C4LaNd offers 24 doctoral positions at KIT, UHO, and UoM. The program focuses on land use solutions for climate and biodiversity crises, integrating natural sciences, social sciences, and economics.

Jitterbit seeks a driven Inside Sales Representative to cultivate new business opportunities and close deals within the DACH region. The ideal candidate will have a proven track record of B2B technology sales success and a passion for exceeding expectations.

Provides customer service support to customers utilizing effective relationship management skills. Responsible for order management throughout the order life cycle, complaint management, and additional office duties.

Area Sales Manager (m/f/d) for Latin America and Brazil. Supports dealers and sales companies with sales, product training, and application consulting. Requires proficiency in English and Spanish, with Portuguese beneficial.

Senior Research Engineer to design, develop, and maintain AI-powered Natural Language Understanding (NLU) systems for automotive and mobility markets. Develop LLM based data generation and refinement methods, dictionaries, grammar rules, and annotations.

The Threat Intelligence Specialist safeguards Deutsche Börse Group's global operations against cyber threats. This role collects, analyzes, and delivers actionable intelligence to guide business decisions and reduce risk.

Design and write a master's thesis on predictive maintenance for commercial dishwasher heating elements. Develop an AI-based condition monitoring approach, from sensor technology to analysis and prediction.

Channel Sales Manager to grow and enhance channel sales initiatives in the DACH region. Develop and execute channel plans, manage partner relationships, and drive revenue growth through indirect sales channels. Experience in SaaS channel sales with a focus on the German market is required.