freelance English-speaking jobs in Valongo

Intern to support the Digital Health team in optimizing healthcare processes through digital solutions. Assist with pathway design, digitization, and implementation, providing technical support and contributing to project success.

Data Engineer with 4+ years of experience needed for full remote role. Expertise in end-to-end data pipeline development, ETL processes, Azure Data Factory, and Databricks required. Proficiency in Python, Java, or Scala, SQL, and NoSQL databases is essential. Fluency in English is mandatory.

Senior Android Engineer to develop and deploy pixel-perfect, responsive Android applications using Kotlin and Jetpack Compose. Experience with unit and UI testing, modern Android UI design principles, and agile processes is required.

Senior IT Security Analyst to join a team managing a global Data & AI Platform. Responsibilities include acting as a 1st Line of Defense representative, ensuring secure deployment and operation of the platform, and supporting initiatives delivering new systems. Requires 5+ years of experience in information security, IT risk management, or IT audit within a large organization, and knowledge of global AI security standards, regulations, and frameworks.

Senior Mobile Engineers/Architects (Android & iOS) needed for a digital banking transformation project. Revitalize an existing mobile app, improve architecture, and ensure regulatory compliance.

Design, develop, and maintain automated test suites for UI and API testing. Integrate tests into CI/CD pipelines and collaborate with developers to ensure quality throughout the software development lifecycle.

Graduate Program participants will drive results across various ventures and initiatives, taking ownership of and developing progressively larger opportunities.

RealAdvisor seeks a Country Manager to launch and scale the Portuguese market. This role involves defining go-to-market strategy, driving revenue, building a team, and managing P&L.

The CRC Product Specialist / Business Analyst supports worldwide Salesforce initiatives for Customer Relation Centres. Collaborates with stakeholders to capture and clarify business requirements, ensuring clear acceptance criteria. Develops user stories, test cases, and criteria in collaboration with developers and testers. Supports other streams as the single point of contact for the CRC Product.

Fleet Operations Analyst will execute regional processes, manage local depots, and ensure operational efficiency. Responsibilities include vehicle management, supplier procurement, stock management, and logistics coordination.

Junior CSS Developer to assist in designing and improving web interfaces for client and internal projects. Will write and modify CSS, resolve layout issues, and collaborate with developers. Requires a solid understanding of HTML and CSS, some JavaScript familiarity, and a willingness to learn.

AI Project Analyst will identify, shape, and prioritize AI opportunities across the business. This role will translate business needs into requirements for development teams and coordinate AI initiatives from discovery through deployment. The Analyst will also ensure compliance with AI standards and policies.

Speechify seeks a Software Engineer to build and maintain data ingestion pipelines for AI model training. Responsibilities include data sourcing, infrastructure management, and collaboration with scientists to optimize data quality and scale. Candidates should have 5+ years of software development experience, proficiency in Python and Linux, and experience with cloud platforms (GCP preferred).

Provide B2B advertisers with product support, troubleshoot campaign issues, and optimize platform performance. Fluent Arabic and English required, along with experience with digital marketing KPIs and a Marketing degree.

Data Scientist to design, build, and evolve data solutions. Integrate and structure data from various sources, build data warehouses and data lakes, and develop data processing workflows in Python. Collaborate with teams to deploy machine learning models and optimize data processes.

Android Developer will build, scale, and optimize a native Android application using Kotlin and Jetpack Compose. Responsibilities include creating modern UI/UX, championing robust architectures, and ensuring performance optimization. Requires 3+ years of native Android development experience, deep Kotlin knowledge, and hands-on experience with Jetpack Compose and modern Android architecture components.

Senior Fullstack Engineer to drive architecture and development of high-quality software. Own complex features end-to-end, ensuring solutions meet business requirements and adhere to performance, security, and scalability standards. Provide technical mentorship, optimize the codebase, and champion modern development standards. Collaborate across functions to translate business requirements into technical solutions. Design robust full-stack systems and contribute to technical decisions. Evaluate new technologies and methodologies to keep the tech stack modern.

Freelance German-speaking Customer Support Specialist needed for a European e-bike company. Provide product consultation, handle inquiries, and manage order tracking for DACH region customers. Must be a registered freelancer with excellent German and English communication skills and experience in customer support.

Python Developer with 5+ years of experience in backend software development. Strong proficiency in Python, C#, or Kotlin, SQL, and cloud-based architectures. Experience with AI/ML concepts and cloud platforms (Azure preferred). Familiarity with DevOps practices and CI/CD pipelines. Fluency in English required.

Lead and grow a team of 7 engineers developing and maintaining a Rust-native systematic options trading platform. Requires 7+ years of experience in systematic trading, options market-making, or low-latency trading systems with strong hands-on experience in Rust, C++, or CW.