freelance English-speaking jobs in Valongo

Senior Project Manager to lead software projects, translating product goals into actionable sprints and ensuring high-quality technical execution. Manage ceremonies using Agile/Scrum methodologies, track project progress, and act as the primary point of contact between engineering, data science, and operations.

Senior Tax Advisor providing VAT and indirect tax advisory services to clients. Conducts research, prepares technical advice, supervises junior team members, and participates in client meetings. Requires a bachelor's or master's degree, 3+ years of VAT experience, and strong English communication skills.

Quality Assurance Analyst needed to evaluate and rate audio, video, text, and photo content. Must be a German native with C1 English proficiency and strong analytical and communication skills.

Manages and shapes demand for all SKUs and network centers, using statistical models and commercial insights to create a consensus forecast. Provides support to the commercial area in estimating the impact of promotions and other activities. Participates in S&OP and scenario planning processes.

HSS & Signalling Engineer will design, test, and implement new mobile telecom solutions. Responsibilities include network design, capacity management, and integration strategy definition. The role requires experience with GSM, UMTS, LTE, IMS, 3GPP, GSMA, and ITU standards. Must have knowledge of signalling network functions, subscriber data management, and mobile services charging.

This academic internship focuses on the long-term aging of conductive particles and its impact on electrical contact probability. The intern will characterize particle surface changes, quantify aging effects on electrical breakdown voltage, and develop a model to predict contact probability evolution.

We're looking for an experienced CRM Service Project Manager to lead service-related CRM transformation projects in an enterprise environment.

Senior Backend Developer for an 8-12 month contract. Design, develop, and maintain backend services using Go. Contribute to service architecture and mentor other engineers. Fluent English required.

Full Stack Engineer Annotator assesses frontend and backend engineering datasets to ensure AI models accurately interpret full-stack workflows. Annotates application datasets, evaluates integration logic, and reviews UI interactions. Requires a Bachelor's degree and 3-5 years of experience as a Full Stack Developer with proficiency in modern frontend and backend technologies. Must hold a relevant certification.

Data Analyst will design and maintain Looker/BigQuery dashboards, drive strategic insights from NPS, contact rates, and agent performance, and build business cases for CX and Ops improvements.

As a Localization QA Game Tester, you will collaborate with a global team to ensure the accuracy and quality of localized games. Responsibilities include identifying and correcting language errors, ensuring adherence to console guidelines, and reporting on found issues. Fluency in Traditional Chinese and conversational English are required.

FotoEventi Group seeks motivated individuals to work as Tourist Photographers in Spain and Italy. Responsibilities include promoting photographic services to hotel guests, conducting photo sessions, and handling sales. Requirements include photographic knowledge, sales drive, teamwork skills, and fluency in English.

As a Data Scientist - Forward Deployed Engineer, you will design predictive models, conduct experiments, and uncover insights to drive product innovation. You will define ontologies and knowledge graphs, collaborate with engineers and domain experts, and operationalize models at scale. You will focus on delivering and scaling AI solutions by embedding into client teams, deploying assets, and refining them.

Quality Engineer (Tester) will enable full stack solutions through testing, automation, and collaboration. Responsibilities include continuous testing, creating automation scripts, and supporting data and environment configuration. Requires advanced proficiency in Test Execution and Management, Java, Selenium, and Cucumber.

As a Digital Sales Manager, you will qualify leads, initiate contact with prospects, nurture relationships, and transfer qualified leads to the sales team. You will analyze lead quality, collaborate with marketing, and contribute to the digital sales strategy.

Treasury Operations Manager to build and lead a new team, overseeing daily treasury activities, implementing systems, and driving operational efficiency.

HSE Specialist will implement policies, procedures, and guidelines in assigned areas. Responsibilities include conducting inspections, audits, risk analysis, and training. Requires a university degree in a related field, professional certifications, and 3-5 years of experience in industrial HSE.

AgileEngine seeks a detail-oriented Manual QA Engineer to ensure the quality and reliability of SaaS web products. Responsibilities include creating and maintaining test cases, executing manual testing, and documenting bugs in Jira. Must have at least 3 years of experience as a manual QA engineer, strong SQL skills, and proficiency in Agile methodologies.

The Associate Manager Medical Affairs and Research supports the Medical Affairs and Research Team in a range of activities related to specific therapeutic areas. Responsibilities include project coordination, event planning, vendor management, content development, research program analysis, and publication support.

Lead a team developing AI-driven cybersecurity solutions for web hosting providers. Define direction and priorities for a security engineering team, build a high-performance team culture, and convert business goals into technical initiatives.