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Prompt Engineer – Generative AI

Remote, Barcelona & Madrid·Added over a year ago (last checked 22 Oct)

Agency

ETHIKOS

143 open roles

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Our summary

Work mode: Remote (Barcelona & Madrid)
English: Required
Education: University degree

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Skills

Nice to have

Requirements

What we're looking for

Bachelor's or Master's degree in Computer Science, Computational Linguistics, AI, or related discipline.
Demonstrated experience designing prompts and workflows for LLMs (OpenAI, Anthropic, Google Gemini, Llama, etc.).
Solid programming skills in Python, with hands-on experience working with APIs.
Strong understanding of NLP methods, embeddings, and vector databases (e.g., Pinecone, Weaviate, FAISS).
Familiarity with cloud platforms (AWS, Azure, GCP).
Ability to work cross-functionally and translate human needs into AI-powered solutions.
Fluent in English (B2+).

Nice to have

Experience with LangChain, RAG pipelines, or MLOps frameworks (Docker, MLflow, Kubeflow).
Knowledge of AI ethics, bias mitigation, and responsible AI deployment.
Background in applied research or social innovation projects.

Pay & benefits

What you'll get

Competitive gross annual salary
Access to state-of-the-art AI tools and infrastructure.
Involvement in high-impact projects where AI contributes to sustainability, education, healthcare, and organizational transformation.
A culture that values collaboration, continuous learning, and purpose-driven innovation.
Training opportunities in generative AI, ethics, and advanced prompt engineering.

👉 This is not just another AI role. It's an opportunity to use technology to build a more conscious, equitable, and human-centered future.

The role

Our client is on a mission to harness the power of Artificial Intelligence for social impact. We are looking for a passionate Prompt Engineer to join their AI Innovation Lab. This role goes beyond technical excellence: it is about leveraging cutting-edge generative AI technologies to drive meaningful change in organizations, communities, and society.

As Prompt Engineer, you will design, optimize, and scale interactions with large language models (LLMs) to deliver solutions that improve decision-making, knowledge access, and collaboration. You will work in a multidisciplinary team of data scientists, software engineers, and domain experts, contributing to projects where AI is applied to human development, sustainability, and social well-being.

What you'll do

Design, test, and refine prompts to maximize the quality, accuracy, and ethical reliability of generative AI outputs.
Build and maintain a prompt engineering framework with reusable templates, libraries, and guidelines.
Collaborate with product, engineering, and research teams to integrate AI into tools that address social and business challenges.
Apply advanced NLP techniques, embeddings, and fine-tuning methods to tailor LLMs to specific use cases.
Implement metrics to evaluate model performance, bias, and inclusivity.
Support the development of AI systems aligned with organizational values, ethical standards, and social responsibility principles.
Stay ahead of the curve in prompt engineering, AI safety, and generative model capabilities.

How you'll work

100% remote work flexibility within Spain.

About ETHIKOS

Ethikos is a Spanish organizational transformation and HR consulting firm that has been operating since 2015. It offers recruitment/selection services, consulting, and training programs, and works around three pillars it calls "Sistema Humano" (talent, leadership, culture), "Herramientas" (its own methodology, including the CSM created in 2018 and six diagnostics), and "Consciencia" (applied neuroscience, purpose, and AI). The company reports more than 600 transformation projects and over 3,000 selection processes completed.

As a recruitment and HR consultancy, most vacancies published on its job board are positions with client organizations across a wide range of sectors and functions — including sales, finance, supply chain, healthcare, HSE, and technology — in locations across Spain such as Barcelona, Madrid, Girona, Granada, Murcia, and Bilbao, as well as in other countries. International professionals should be aware that applying through Ethikos typically means being recruited for a client company rather than for Ethikos itself, though the firm also hires for its own team (e.g., Recruiter Consultant roles). Its website and careers platform are available in Spanish and English.