73 freelance English-speaking jobs in Lisbon

Freelance Civil Engineer to design computational engineering problems requiring Python programming for solutions. Must have a Civil Engineering degree and Python proficiency for numerical validation.

About the Role This is a freelance role for a Tendem project. ... Benefits Why this freelance opportunity might be a great fit for you?

About the Role This is a freelance role for a Tendem project. ... Benefits Why this freelance opportunity might be a great fit for you?

Freelance Data Scientist to design and develop computationally intensive data science problems using Python and SQL. Must have 5+ years of experience, expertise in Python libraries (Pandas, NumPy, Scikit-learn), statistical analysis, and machine learning.

About the Role This is a freelance role for a Tendem project. ... Benefits Why this freelance opportunity might be a great fit for you?

About the Role This is a freelance role for a Tendem project. ... Benefits Why this freelance opportunity might be a great fit for you?

Freelance AI trainer needed to design computational physics problems requiring Python programming. Must have a physics degree, Python proficiency, and experience with numerical simulation methods.

Freelance AI trainer needed to design computational chemistry problems requiring Python programming. Must have a chemistry degree, Python proficiency, and experience with numerical methods in chemistry.

Freelance Junior Journalist will train AI models to understand and generate human-like text. Tasks include crafting responses, generating prompts, defining scoring criteria, and ensuring quality.

Freelance mathematicians with a degree and 2+ years of experience are sought to design problems, evaluate AI solutions, and improve AI reasoning for leading tech companies.

Join us as a Freelance Data Scientist (May/June – December 2026) We're looking for a data scientist to

Freelance Agent Evaluation Engineer needed to create challenging tasks and evaluation criteria for AI coding agents within simulated environments. Requires experience in software development, testing, and Python.

Freelance AI trainer needed to design computational physics problems requiring Python programming. Must have a physics degree, 2+ years experience, and strong Python skills (NumPy, SciPy, Sympy).

Visit.org is looking for a passionate and ambitious Freelance In-Person Event Host in Lisbon, Portugal

Freelance AI trainer needed to design and develop computational biology problems requiring Python programming. Must have a biology degree, Python proficiency, and experience with biological data analysis and algorithms.

Freelance AI trainer needed to design and develop computationally intensive statistical problems requiring Python programming. Must have a degree in Statistics or related field, 2+ years of experience, and strong written English.

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Freelance English writers train AI models by crafting text that teaches AI reasoning, logic, and clarity. Contributors create original, fact-checked responses, collaborate with Quality Assurance Specialists, and adhere to style and quality standards.

to $32/hour depending on your skills, experience, and project needsTake part in a flexible, remote, freelance

Senior Fullstack Developer will design, build, and maintain backend services and REST APIs using Node.js and develop frontend applications using React and TypeScript. You will own features across the full stack, from database schema to UI interaction.