freelance English-speaking jobs in Valongo

Respond to guest repair requests, perform preventive maintenance on tools and equipment, and perform basic repairs on various items. Must have a driver's license and knowledge of air conditioning, electrical, mechanical, plumbing, and other systems.

BIOPOLIS Association seeks an Auxiliary Researcher with a PhD in Biology or a related field for a 9-month fixed-term contract. The successful candidate will conduct research within the BIODESERTS research group, focusing on desert bird ecology.

CloudBrothers seeks experienced Data Center Technicians to maintain and monitor data center infrastructure in Sines, Portugal. Responsibilities include hardware installations, troubleshooting, cabling, and ensuring compliance with safety and security standards.

Senior Business Development Manager to lead international commercial expansion across plant genetics, propagation, and agricultural supply chains. Focus on market development, partnerships, licensing, and revenue growth in Europe, North Africa, and emerging regions. Requires 5+ years' experience in agribusiness, international market development, and cross-border operations.

Lead the architecture and evolution of a new Android experience, mentoring engineers and guiding technical decisions. Requires 7+ years of Android development experience, mastery of Kotlin, Coroutines, and Flow, and a proven track record of defining mobile architecture for large-scale applications.

The University of Coimbra is seeking a Research Grant Assignment for a project focused on Neuropsychology. The successful candidate will support research activities including data collection, analysis, and report writing. The grant is funded by FCT and is non-renewable.

The Universidade da Madeira is seeking an Assistant Professor in History, with an emphasis on Modern History. Applicants must hold a PhD in History and have a curriculum considered by the jury as having scientific merit, research capacity, and pedagogical activity. The position requires a scientific-pedagogical project on a History curricular unit and a curriculum vitae highlighting relevant activities.

Design high-converting landing pages and A/B tests for eCommerce brands. Translate CRO strategy into effective designs. Agency experience and a portfolio showcasing conversion-focused work required.

The OT Cybersecurity Engineer maintains security measures, assessments, and incident response for Operational Technology (OT) environments. This role focuses on protecting industrial control systems (ICS) and critical infrastructure from cyber threats. Responsibilities include risk assessment, vulnerability analysis, incident response, security monitoring, and compliance with industry standards.

Network Deployment Build Lead will manage end-to-end project ownership of network deployments including infrastructure migrations and data center builds in the EMEA region. Responsibilities include working with stakeholders, scheduling resources, configuring devices, and creating documentation. Requires experience deploying, troubleshooting network devices, and cabling infrastructure.

Research Grant for a First Stage Researcher (R1) to contribute to the optimization of magnetocaloric regenerator geometries for a project on clean and efficient vaccine transportation cooling.

Design, develop, test, and deploy high-quality OutSystems applications. Work collaboratively to solve problems with other team members. Develop custom components and integrations with other systems. Ensure the performance, quality, and responsiveness of applications. Provide technical leadership and guidance to others. Review others' code, share skills and knowledge. Be proactive and organized within your team. Innovate and contribute ideas that will improve the application’s quality. Create and maintain comprehensive documentation. Troubleshoot and resolve issues related to application development and deployment. Stay up-to-date with the latest OutSystems platform features.

Senior Backend Developer with 7+ years of experience in Python and related frameworks. Responsibilities include maintaining and refactoring the product platform, automating systems, and modernizing infrastructure. The role is hybrid, based in Loulé/Faro, Algarve.

Leads and supports global Managing Director & Partners (MDP) lifecycle activities including recruiting, departures, and office transfers. Manages day-to-day operations for over 250 annual lifecycle requests, ensuring precise document preparation and end-to-end tracking. Develops cash flow estimates and owns business analytics and reporting. Partners with stakeholders to ensure alignment, accuracy, and compliance.

The Business Analyst translates business needs into actionable requirements, working with stakeholders and technical teams. The role involves documenting requirements, supporting agile delivery teams, and contributing to data-driven decision-making.

The Understanding and Postponing Yeast Cell Death (UPsYDe) doctoral network seeks a PhD candidate to develop rapid and reliable high-throughput methods for analyzing yeast cell death in industrial bioprocesses. The successful candidate will integrate omics analyses with targeted assays to identify molecular markers of regulated cell death and aging.

Research Grant (RG) in the scope of R&D projects "LiquidGreen - Production of Liquid Fuels by the electrochemical conversion of biogas". The research activity aims at the preparation and fabrication of protonic electrochemical cells.

Research Grant (BI) for 3 months, renewable for another 3, starting March 19, 2026. Tasks include evaluating natural product extracts, applying them to food products, and conducting sensory analysis and shelf life evaluations. Must be enrolled in a PhD program in Biological Sciences or related areas and hold a Master's degree in Food Sciences.

Identity and Access Management (IAM) Expert needed for hybrid role in Porto. Requires experience in IAM operations, directory technologies (Active Directory, LDAP, Microsoft 365 Identity Governance), cloud platforms (Entra ID, AWS, Azure), and IAM lifecycle management. Must have scripting (PowerShell, Java) and API integration (REST/SOAP) skills. Strong understanding of Zero Trust principles and ITSM tools (Jira, ServiceNow) is essential. University degree in a related field is required.

The Gulbenkian Institute for Molecular Medicine seeks a postdoctoral fellow for the "BEE_GEMS" project. The fellow will work on studying bacterial strain interactions in the honey bee gut, performing tasks such as bee manipulation, gut dissection, bacterial cultivation, and genome modification.