freelance English-speaking jobs in Valongo

As a Security Test Expert, you will ensure the robustness of the Railigent X IoT Platform. You will advise development teams on security best practices, develop and execute security tests, and collaborate with teams to remediate vulnerabilities.

CRO & Personalization Analyst to drive digital performance and conversion optimization through testing, personalization strategies, and customer experience insights. Responsibilities include identifying A/B test hypotheses, defining and implementing a CRO roadmap, analyzing test results, and tracking key metrics. Requires experience in CRO, A/B testing, personalization platforms, and analytics tools.

Solvay seeks a Vulnerability Analyst to identify and help fix security weaknesses in systems, including software, operating systems, and cloud platforms. Responsibilities include vulnerability detection and assessment, risk prioritization, remediation support, continuous monitoring, and stakeholder guidance.

Java Developer to design, develop, and maintain scalable backend systems using Spring Boot, microservices, and event-driven architectures.

Sr. Product Manager to define and drive product strategy for a leading igaming company. Requires 5+ years of product management experience, preferably in digital or gaming, strong analytical skills, and excellent communication.

Designs, evolves, and maintains ML infrastructure for a high-scale marketing platform. Develops ML pipelines, infrastructure (Databricks, AWS, Ray, Kubernetes), and observability frameworks. Partners with Data Science teams to enable efficient model deployment and iteration.

Resolve complex customer problems related to open source software including Ubuntu, Kernel, Ceph, OpenStack, and Kubernetes. Maintain relationships with Canonical's Field, Support, and product engineering teams. Participate in upstream communities and develop bug fixes and patches.

Data Engineer to design, develop, and maintain data pipelines using Airflow, dbt, and Terraform. Experience with GCP data services, Python, SQL, and Git required.

We seek a Portuguese Subject Matter Expert (SME) to support the development of online K1-K9 learning resources. The SME will collaborate with instructional designers to ensure academic accuracy, curriculum alignment, and effective pedagogical practices.

Mechanical Design & Simulation Engineer needed for innovative mechanical system design and analysis. Responsibilities include CAD modeling, FEA & CFD analysis, and collaboration with multidisciplinary teams. Master's degree in Mechanical Engineering and 3+ years of experience in mechanical design and simulation required.

Experienced Backend Developer needed to design, develop, and maintain scalable backend solutions using .NET 6+, C#, and Microservices Architecture. Collaborate with cross-functional teams to deliver end-to-end solutions within an Agile environment.

Leads technology delivery and transformation across Portugal, Spain, Italy, and France. Partners with country Managing Directors and Operations to ensure technology enables efficiency, growth, security, and customer experience. Drives platform and process transformation, aligning with EU Tech standards and governance.

Experienced Key Account Manager to drive profitable growth of TCL's MDA business in Portugal. Responsible for sales strategy, contract negotiation, customer relationship management, and market analysis.

Manages and maintains Windows Server and Linux systems, Active Directory, DNS, DHCP, and virtualization platforms. Configures, maintains, and monitors network equipment, implements firewall policies, and operates backup and recovery solutions.

Junior Treasury Analyst will support banking infrastructure maintenance, manage bank accounts, and update Treasury Management System information. Collaborate with the Treasury team and provide support to other analysts.

Citrix Specialist needed with 3-4 years of experience in enterprise Citrix environments. Expertise required in Citrix CVAD, NetScaler/ADC, ADM, and WEM. Strong PowerShell scripting and Agile experience are also needed. Fluent English required.

Senior Full Stack Software Engineer will design, build, and maintain scalable user-facing applications. Responsibilities include taking technical ownership of features, collaborating with teams, and advocating for automated testing and production excellence. Requires 5+ years of experience in software development, strong frontend expertise (React, JavaScript/TypeScript), and backend experience (Kotlin/Java, Spring Boot, RESTful APIs).

Develop and deploy AI/ML models for CIB use cases including risk management, market analysis, and operational efficiency. Extract, clean, and transform data; identify features to improve model performance. Contribute to MLOps pipeline and CI/CD processes. Collaborate in a distributed team, communicate technical concepts, and stay up-to-date on AI advancements.

Senior Java Software Engineer to design, develop, and maintain high-performance Java-based applications and services. Experience with Spring Boot, Java 21/17, AWS cloud services, and CI/CD pipelines is required.

Revolut seeks a Credit Compliance Manager to implement regulatory frameworks for credit features. The role involves advising on compliance requirements, creating and implementing policies, and managing the training program. Requires 4+ years of experience in regulatory compliance, knowledge of credit products, and fluency in English and French.