freelance English-speaking jobs in Bielefeld

Electrical Engineer needed for test lab. Responsibilities include creating test specifications, operating equipment, evaluating results, and analyzing deviations. Requires a degree in electrical engineering or equivalent, experience in the transformer sector, and proficiency in Visual Basic and MS Office. Must be physically fit for high-voltage work and fluent in German and English.

Lead a team of engineers, architecting and scaling event-driven cloud infrastructure. Contribute to code, mentor engineers, and translate business goals into technical objectives. Possess deep technical fluency in Node.js/TypeScript or C++, Python, and cloud architectures (AWS).

Associate Legal Counsel will draft, negotiate, and advise on technology service agreements for AWS commercial customers in Germany and EMEA. The role provides legal counsel on product development, operational, security, compliance, and data protection matters.

Deliver groceries to customers efficiently by e-bike or e-scooter. Maintain a high level of customer service and consistently meet or exceed delivery targets. Earn at least €13.90 per hour plus tips. Must be at least 18 years old, have a work permit in Germany, and speak English or German.

Research assistant/doctoral candidate to develop HTS magnet systems for the FAIR facility. Responsibilities include electromagnetic design, construction, testing, and documentation. Requires a university degree in physics or applied physics and advanced knowledge in mechanical engineering, cryogenics, electrical engineering, or related fields. Experience with superconducting magnet technology is advantageous.

Warehouse Associate needed for general warehouse activities including loading/unloading trucks, storing goods, and maintaining cleanliness. Must be able to lift up to 25 kg and possess German, English, and Polish language skills.

Drive the technological evolution of sensor systems, focusing on robust, precise, and innovative solutions for demanding industrial inspection applications. Translate customer and application requirements into viable system architectures, with a focus on ultrasonic technologies and state-of-the-art signal processing. Define, plan, and manage verification and validation tests at system level based on technical specifications. Advise management on technological topics, particularly sensor technologies, system platforms, and inspection applications. Work closely with an interdisciplinary and international team across mechanics, electronics, and software.

Student Assistant to support photo and video management, research, editing, and communication. Requires university enrollment, ideally in a related field, and experience with photo databases and Adobe Creative Cloud. Fluency in English and German is essential.

Full-Stack Developer (m/f/d) will work on enterprise projects, developing features from frontend to backend. Responsibilities include implementing web frontends, backend services, APIs, and integration layers. Requires 4+ years of experience in software development, Java/Spring Boot, TypeScript/Angular/Vue/React, REST APIs, and Git. Must have strong German (C1) and English (B2) skills.

Support and implement the Compliance Monitoring Program/System. Conduct audits and inspections in Airworthiness, Maintenance, and Management Systems. Ensure compliance with aviation legislation and industry standards. Draft and review company documentation.

The Collaborating Centre on Sustainable Consumption and Production seeks an External Funding Manager to provide financial and administrative support for externally funded projects. The role involves costing, project set-up, controlling, communication with project teams and funders, accounting, and audit support.

Lead the legal function of a growing international technology company. Provide legal, commercial, and strategic advice to the executive team and Board. Manage complex transactions, agreements, and risk. Develop legal processes and lead a mid-sized legal team. German-qualified lawyer with significant in-house or private practice experience required.

Develop and optimize optical system designs for automotive holographic displays. Translate system requirements into robust optical concepts and evaluate performance. Collaborate with interdisciplinary teams to ensure system feasibility and performance.

Warehouse worker needed for various shifts (early, late, night). Duties include unloading, sorting, and transporting packages. Must be able to lift up to 15kg and stand/walk for extended periods. Must be 18 years or older and proficient in German and/or English/Polish.

IT System Administrator responsible for planning, implementing, and administering IT infrastructures in Windows Server environments. Supports and develops Microsoft 365 environments for SME clients. Requires 3+ years of experience and business-level German proficiency.

Research position focused on modeling, simulation, and integration of mobile robotic systems. Requires expertise in simulation, virtualisation, and mobile robotics, as well as programming skills in C++, Java, or Python.

Tutor for the Xcool Lab, supporting school students in molecular biology and chemistry experiments. Prepare experiments, teach, supervise, and guide tours. Must be currently studying in a relevant field and have practical laboratory experience. Fluency in German and English required.

Drive model post-training for Large Language Models powering Alexa+. Own the full model development lifecycle, from data curation through deployment. Design and execute training recipes, including supervised fine-tuning, reinforcement learning from human feedback, and preference optimization. Collaborate with scientists and engineers to bring models to scale. Publish findings at top-tier NLP/ML conferences.

Job Description A Snapshot of Your Day In this role, you’ll play a key part in enhancing our integrated plant engineering environment by designing and implementing robust data models and system configurations. Your time is split between designing and refining data models, configuring the platform, and troubleshooting issues with colleagues and users.

Leads the transformation of Keenfinity's data landscape into a modern, lean, and business-driven setup. Establishes data ownership, governance, and scalable processes. Focuses on defining data domains, implementing data governance, and integrating MDM processes into core systems. Requires experience in MDM, data governance, and enterprise data management.