freelance English-speaking jobs in Valongo

Senior Python Developer needed to design, develop, and maintain scalable applications. Requires 3+ years of Python experience, familiarity with web frameworks (Django, Flask), databases, and cloud platforms. Must have strong software engineering fundamentals and experience with Agile/Scrum.

The National Energy and Geology Laboratory seeks a PhD in Mechanical Engineering or a related field for a 36-month contract. The role involves research on hybrid solar collectors, including modeling, prototyping, techno-economic analysis, and Life Cycle Assessment. Candidates should have experience in R&D related to solar energy conversion and scientific publications.

INESC TEC is offering a 6-month Research Initiation Grant (renewable up to one year) in Informatics. The grant focuses on reviewing data space architectures and federated data infrastructures, with a focus on Gaia-X Trust Framework principles.

This role provides global print administration support, including troubleshooting incidents, managing the printer lifecycle, and ensuring compliance with security and sustainability policies.

Develop, test, and deploy PL/SQL code to support application requirements. Design and optimize database schemas, analyze and optimize SQL queries, and write clean, well-documented code.

Lead and mentor a team of engineers, driving infrastructure strategy and technical excellence across hybrid environments (on-premises and cloud).

Business Manager will identify and prospect potential clients, develop client relationships, and collaborate with the sales team to implement sales strategies. Responsibilities include monitoring market trends, preparing presentations, and sourcing and pre-selecting candidates.

Senior Technical Engineer to support international construction projects, focusing on façades, roofing, and waterproofing systems. Analyze drawings, propose solutions, prepare documentation, and ensure compliance with Eurocodes and standards.

Provide on-site and remote technical support to users. Install, configure, and maintain IT equipment. Troubleshoot issues with Office 365, email, and information migration. Manage Active Directory users and groups. Support asset management tools and participate in hardware rollouts. Document incidents, requests, and solutions.

Payroll Specialist needed for global team. Process payroll, manage contracts, and fulfill reporting obligations. Requires 5+ years of experience, SAP/SuccessFactors knowledge, and proficiency in Excel. Must be fluent in English and willing to work on-site.

Senior QA Engineer to perform testing of application front-end, back-end, and end-to-end processes. Define, execute, and maintain test scenarios within an Agile team. Must have 4-5 years of QA experience and knowledge of non-functional testing. Excellent communication skills in English required.

Senior Operations Manager to oversee daily operations and commercial decisions for an international tech services company. Responsibilities include contract approvals, team assignments, supplier management, financial validation, and compliance oversight. Requires 5-10 years of operational experience, strong financial acumen, and fluency in English. Must reside in Madeira.

The Producer will provide support and oversight across project phases, ensuring efficient planning and execution. Responsibilities include budget preparation, client deck updates, and managing project communications. The ideal candidate has experience coordinating field teams and a background in visual arts, production, or a related field.

Post-Doctoral Research Fellowship to study the effects of heterogeneity in multi-species models governed by the replicator equation. The fellowship is for 7 months, starting in May 2026. Applicants must have a PhD in a relevant field, strong publication record, and proficiency in Python, MATLAB, R, or similar software.

Research Initiation Grant for a Bachelor's degree holder enrolled in a non-degree-awarding course, focused on the development of didactic knowledge in mathematics using artificial intelligence in pre-service teachers.

The Institute of Public Health of the University of Porto is seeking a Senior Technician for the "ASAS - Alimentação Saudável, Apelativa e Saborosa" project. The position is for an indefinite term, subject to project duration. Applicants must have a Bachelor's degree in nutrition sciences or a related field and be registered with the Order of Nutritionists.

The University of Aveiro is seeking a First Level Doctorate Researcher in Communication Sciences and Technologies. The position is funded by the EU's H2020 ERA Chair "BESIDE" project. Applicants must hold a doctorate in Communication Sciences or a related field and have a scientific and professional curriculum suited for research activities.

Administrative Assistant supporting operational business tasks. Responsibilities include updating databases, managing insurance policies, setting up financial flows, and handling client portfolios. Requires advanced Microsoft Office 365 skills, strong German and English language proficiency, and organizational skills.

Experienced data engineer needed to build and maintain data pipelines and platform components on AWS. Will implement ingestion and serving workflows, contribute to platform reliability, and collaborate with teams to deliver reliable datasets. Requires 4+ years of experience building production data pipelines, strong Python and SQL skills, and experience with tools like Airflow, dbt, and Kafka.

Risk Analyst/Permanent Controller needed for international project. Define and promote cybersecurity governance for ITG's Payment Services. Oversee end-to-end cyber risk supervision across multiple sectors. Identify, analyze, and manage risks, including ICT and non-ICT risks. Collaborate on permanent control activities and issue risk alerts.