freelance English-speaking jobs in Valongo

Accounts Payable Specialist needed to manage vendor master data, process invoices, and ensure timely payments. Minimum 2 years of accounting experience and a Bachelor's degree in Accounting or Finance required. Strong SAP knowledge is desirable. Must be proficient in English and possess excellent communication and problem-solving skills.

DevOps Engineer to develop and maintain a low-latency algorithmic trading platform. Responsibilities include infrastructure design, SDLC pipeline management, CI/CD improvements, and application infrastructure automation. Requires 3+ years of SRE/DevOps experience, proficiency in Linux/UNIX, TCP/IP, and SDLC tools.

Data Engineer / Web Developer needed to design, implement, and maintain data tools, ETL jobs, and data models. Experience with Python, PySpark, SQL, Flask, Vue.js, and Power BI required.

Senior Credit Controller will handle premium collections, reconcile account differences, and manage overdue debts. Requires experience in credit control, proficiency in English and French, and strong analytical skills.

Designs, develops, and executes automated tests for the Passenger Information product (APIS). Collaborates with engineering teams to identify test scenarios and requirements. Integrates automated tests into the continuous integration pipeline.

The GBS People Services Intern supports employee data accuracy and compliance throughout the employee lifecycle. This role involves managing personal data, performing administrative tasks, and assisting with process improvements and system testing.

Mechanical Supervisor needed for data center construction projects in Portugal. Leads safe working practices, manages QA of mechanical installations, coordinates with other trades, and prepares progress reports. Requires 5+ years of experience as a Mechanical Supervisor and strong communication skills.

Business Continuity & Operational Security Manager will develop and implement security controls, manage security documentation, and maintain the Business Continuity Plan.

Data Engineer needed to extract, transform, and manage data within the Miles Enterprise Suite. Responsibilities include data extraction, transformation, provisioning data management capabilities, and developing data consumption interfaces. Requires 3-5 years of experience in a data engineering role, proficiency in PostgreSQL, Python, and Java, and excellent communication skills in English.

Senior Product Manager will drive the end-to-end testing cycle, create product roadmaps, and lead initiatives across web and mobile platforms. This role requires 5+ years of experience in Product Management, ideally in e-commerce or marketplaces, with a proven track record of shipping features and running A/B tests.

Traffic Management Officer to plan, develop, and execute digital marketing campaigns. Manage campaign calendars, configure and monitor campaigns, and analyze performance. Requires a Bachelor's degree in Marketing or related field and 1-3 years of experience in paid acquisition campaigns. Fluent in French and English.

Lead global paid search strategy across multiple platforms for a rapidly growing digital services provider. Manage a team, optimize multi-million dollar budgets, and drive performance in the iGaming sector. Requires 5+ years of paid search experience, 2+ years in a leadership role, and expertise in iGaming marketing.

Provide customer support to Dutch speakers via phone, email, and chat. Fluent Dutch and minimum B2 English required.

QA Automation Engineer will design and implement intelligent test solutions using modern frameworks and GenAI tools. Responsibilities include test design, defect management, collaboration with development teams, and automation framework development using Playwright, Rest Assured, and Postman. Experience with API testing automation, test management tools, and cloud experience (Azure) is required.

Kitchen Assistant position available. Previous kitchen experience is helpful but not required as full training is provided.

Design Operations Lead will build and scale the operational backbone of Cleo's Experience organization. This role focuses on enabling Design and Research to operate with clarity, speed, and technical excellence. You will architect the infrastructure for planning, building, shipping, and scaling product experiences.

Senior Frontend Developer with 5+ years of experience in ReactJS/NextJS, HTML, CSS, Typescript, and JavaScript. Develop and maintain web applications, implement responsive designs, and utilize DevOps skills including CI/CD pipelines and GitHub workflows. Strong problem-solving, communication, and collaboration skills required.

Operations Manager for a busy restaurant stall at Time Out Market Lisbon. Leads shifts, manages staff, ensures high service standards, and maintains hygiene and compliance. Requires experience in fast-paced hospitality, strong people skills, and fluency in English. Portuguese is a plus.

Backend Software Engineer needed for a Lisbon-based project. Expert C#.NET experience, microservices architecture knowledge, and experience with Kafka, ElasticSearch, and cloud technologies required. Proven ability to drive technical decisions, mentor engineers, and work effectively in an Agile environment. Fluency in English is essential.

Provide on-site and remote support for a global financial data environment. Execute Linux system operations via command line, troubleshoot connectivity and application issues, and communicate with IT teams.