freelance English-speaking jobs in Siegen

Postdoctoral Researcher (gn*) in the Sánchez Lab at the European Institute for Molecular Imaging. Focus on plexin receptors, combining single-molecule localization methods and cell biology to decipher their stoichiometry, dynamics, and role in various biological processes. PhD in life sciences required, experience in cell and molecular biology, and microscopy methods.

The University of Duisburg-Essen and the Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V. are offering 11 PhD positions in various departments and institutes. Successful candidates will conduct high-level interdisciplinary experimental research projects in the RTG 2989 «Targeting cellular interfaces in Reperfused Acute Myocardial Infarction (TCI repAMI)».

Experienced legal professional to support complex global operations and investment transactions. Will provide legal support for R&D, including contract review/drafting, new business launches, and IP matters. Requires 5+ years of contract law experience, US/UK legal frameworks knowledge, and experience in corporate law, M&A, or venture capital transactions.

Endowed professorship for Metrology and new measurement methods for quantitative cell analysis at Charité - Universitätsmedizin Berlin and the Physikalisch-Technische Bundesanstalt (PTB). The position is a joint appointment according to the Jülich model with a limited employment status under private law in full-time. The professorship is linked to the management of the research area «Metrology and New Measurement Methods for Quantitative Cell Analytics» at PTB. The focus lies on developing new reference measurement methods to assess infection risks posed by emerging viruses and bacteria using advanced technologies such as optical imaging, flow cytometry, and artificial intelligence (AI).

Experienced systems engineers will build and lead operations and development teams for the European Sovereign Cloud (ESC), delivering high-availability AWS services exclusively for EU customers. Responsibilities include overseeing ESC launch in 2025, collaborating with global AWS teams, and ensuring availability, reliability, latency, performance, and efficiency of ESC services.

Postdoctoral position in the project "Making Political Decisions" at the Cluster of Excellence "The Politics of Inequality". The position starts September 1, 2026, for four years. The successful applicant will contribute to research activities using experimental designs to study political decision-making.

Shape the future growth of the Activia brand within the gut health segment. Support innovation projects, identify growth opportunities, and lead the Always-On content strategy on Instagram.

Scientist will contribute genetic engineering expertise to R&D projects, designing, executing, and analyzing molecular biology experiments. Responsibilities include developing and optimizing constructs, validating them using transient expression systems, and planning genetic engineering workflows. The role requires a Master's degree or Ph.D. in a relevant field and several years of hands-on experience in genetic engineering.

Lead and transform the global Hydraulic business unit (H+L) to achieve profitability exceeding 10% EBIT. Define and implement a global strategy, identify growth opportunities, and streamline operations. Oversee site-level operations and provide functional leadership for multiple international locations.

Provides legal advice and documentation support for corporate lending transactions across EMEA, with a focus on German lending business.

Experienced systems engineers will build and lead operations and development teams for the European Sovereign Cloud (ESC), delivering high-availability AWS services exclusively for EU customers. Responsibilities include overseeing ESC launch in 2025, collaborating with global AWS teams, and ensuring availability, reliability, latency, performance, and efficiency of ESC services.

Senior commercial leader to drive growth for digital pathology portfolio across Europe. Leads and mentors a team, manages sales funnel, and builds key account relationships. Requires 5+ years of experience in healthcare technology sales, digital pathology expertise, and proven success in complex sales cycles.

Manage and coordinate the global sales project roadmap across all channels, ensuring consistent execution and driving the rollout of global sales initiatives. Lead and contribute to strategic projects focused on improving sales structures, tools, and cross-channel integration. Define future-state sales processes and identify business needs for sales tools. Act as the primary global business contact for sales-related topics.

Leads the circularity strategy for the Automotive division, driving circular economy models and ensuring compliance with regulations and customer requirements. Collaborates with product development, operations, and customer teams to implement and track circularity initiatives. Provides expertise on circularity strategies, methods, and regulations, translating them into actionable recommendations.

Provides support to staff across departments with travel, invoices, refunds, and inventory management. Supports scientific community by assisting with online application procedures for master and Ph.D. students.

Network Engineer needed for 10+ month contract. Experience with Cisco Catalyst 9000 and Cisco Industrial Ethernet required. Responsibilities include network deployment, configuration, and audits. Must be based in Germany.

Procurement Officer supports the effective and consistent delivery of procurement processes. Ensures value for money throughout the procurement to payment process. Manages travel bookings, purchase processes, and payment processing.

Senior Full Stack Developer will design, develop, and implement new features for the Heat Fleet platform, including backend (Node.js) and frontend (Vue.js) development. Responsibilities include API design, code quality assurance, and team collaboration. Experience with Node.js, TypeScript, Vue.js, and NoSQL databases is required. Fluent English is mandatory, basic to intermediate German is preferred.

Develop and implement the webshop product strategy (Adobe Commerce) in close alignment with eCommerce and Sales Management. Act as the central interface between stakeholders and the international development setup. Responsible for the technical and functional scaling of the webshop across 22 markets. Manage the backlog, prioritize based on value, and translate epics and features into user stories. Coordinate deliveries with internal and external development teams and ensure high implementation quality. Provide management-level reporting on status, risks, forecasts, and dependencies.

Develop new features for a mobile comparison platform using React, TypeScript, and Remix. Improve existing frontend components and collaborate with backend, UX/UI, and product management in agile teams.