Senior Prompt Engineer

At M47, we spark AI!

We help tech companies understand how AI can drive their strategic objectives and effectively plan an implementation roadmap. Our mission is to leverage AI to create solutions that can understand, interpret, and respond to human language, empowering businesses and making better-informed decisions.  

Join us in making the future more intelligent!

About your day-to-day:

As a Senior Prompt Engineer, you will design, optimise, and manage prompt engineering strategies across multiple AI-driven applications, such as large language models (LLMs), chatbots, voicebots, and AI-powered translation systems across EMEA and the US. Your main goal will be to provide scalability and excellence for the applications.

• Fine-tune and evaluate LLM behaviour based on business needs, user feedback, and performance metrics.

• Design experiments to assess prompt performance, accuracy, and scalability across different languages and contexts.

• Optimise processes and workflows to ensure scalability, cost-efficiency, and global standardisation, while adapting to regional nuances as needed.

• Implement Promp Engineering’s best practices, creating documentation and providing training.

• Translate business requirements into AI-powered solutions, aligning user and business needs with technical feasibility.

• Stay up to date with advancements in LLM models to continuously improve prompt effectiveness, methodologies, and drive innovation.

Requirements

This is for you if you have:

• Over 6 years of experience in NLU or software engineering and 3 years of hands-on experience working specifically with LLMs and prompt engineering

• Proficient in designing, deploying, and optimising LLM-driven Conversational AI solutions (such as chatbots or voicebots).

• Hands-on experience with Agentic AI frameworks for autonomous agents orchestration.

• Previous experience dealing with and solving hallucinations in LLM-based applications.

• Experience integrating LLMs via APIs (e.g., OpenAI, Anthropic, Google Gemini) and managing prompt libraries.

• Experience with end-to-end design and performance tuning of chatbots and voicebot platforms.

• Experience with multilingual and cross-cultural prompt design, testing, and evaluation.

• Familiarity with speech-to-text (STT) and text-to-speech (TTS) technologies

• Strong English communication skills.

What is in it for you?

💪🏽 Indefinite full-time contract

☀️ Office located at the heart of Madrid

💸 Comprehensive compensation package, including private medical insurance coverage and flexible remuneration through Cobee, including meals, gym pass, transport, and kindergarten.

📚Learning budget to support your career ambition.

🏃 Get your wellness improved with Urban Sports 

💰 Cover your tax and fiscal management with TaxDown

🌍 Great international, inclusive, and dynamic work environment (more than 20 nationalities!)

**M47 Labs not only encourages but is actively working on empowering its diverse and inclusive talent. M47 Labs is committed to ensure a non-discriminative workplace, work life and selection process and such decisions will not be influenced by race, color, religion, gender identity or expression, sexual orientation, disability, social and conjugal status, age or other applicable characteristics. M47 Labs prohibits discrimination and harassment of any kind and all employment is decided on the basis of qualifications, merit, and business needs.**

In accordance with the provisions of Regulation (EU) 2016/679 of 27 April (GDPR) and the Organic Law 3/2018 of 5 December (LOPDGDD), we inform you that personal data and email addresses collected from the Data Subject will be processed under the responsibility of M47 LABS & INTERNATIONAL FIDUCIA SL for a legitimate interest and for the purpose of sending communications about our products and services and will be retained for as long as none of the parties object. The data will not be communicated to third parties, unless under legal obligation. You can exercise your rights of access, rectification, portability and erasure of your data and those of restriction and objection to their processing by contacting DIPUTACIÓ, 279 3 6 - 08007 BARCELONA (Barcelona). E-mail: info@m47labs.com. If you consider that the processing does not comply with current legislation, you may file a complaint with the Spanish supervisory authority at www.aepd.es.