NLU Expert

At Vodafone, we’re not just shaping the future of connectivity for our customers – we’re shaping the future for everyone who joins our team. When you work with us, you’re part of a global mission to connect people, solve complex challenges, and create a sustainable and more inclusive world. If you want to grow your career whilst finding the perfect balance between work and life, Vodafone offers the opportunities to help you belong and make a real impact.

As a Natural Language Understanding (NLU) Expert for our Conversational Intelligence team, your primary mission is to spearhead the development and optimization of LLM-based and ML-based Greek language understanding models for Voice and Chat. Your role is pivotal in ensuring our conversational interfaces comprehend and respond effectively to user inputs in the Greek language, delivering a seamless and human-like user experience.

Key Accountabilities:
• Lead the design, development, and optimization of NLU models specifically tailored for the Greek language through prompt design, semantic evaluation, and ML-based techniques.
• Collaborate with team to curate and annotate datasets for training and fine-tuning NLU models. Implement robust training pipelines to continually improve language understanding capabilities.
• Ensure accurate intent recognition, entity extraction, and context awareness
• Define, maintain, and evolve structured system prompts and language specifications (rules, constraints, taxonomies, and output schemas) that govern how LLM‑based and RAG‑enabled systems analyze, interpret, and generate responses.
• Continuously optimize and refine existing NLU models for efficiency, accuracy, and responsiveness. Monitor and analyze system performance, identifying areas for enhancement and implementing solutions.
• Conduct thorough testing and validation of NLU models to ensure high accuracy and reliability across various user inputs and scenarios

• Solid Computational Linguistics, AI or Computer Science background (MSc preferred). 
• Knowledge of principles of creation of training and test dataset 
• Proven experience in developing and deploying NLU models in real-world applications.
• Experience with Prompt/Context Engineering
• Scripting skills (python/bash) and/or metasyntax annotation for context-free grammars. 
• Data science knowledge, experience in data manipulation, augmentation, and data mining.

You are the perfect match if you:
• Are passionate about technology and committed to continuous learning and innovation.
• Proactively seek opportunities to improve and take full ownership of your work.
• Thrive in fast-paced, ever-changing environments, adapting smoothly as priorities shift.
• Maintain a positive, collaborative mindset and embrace challenges constructively.
• Work effectively within multidisciplinary teams, where collaboration and proactive problem-solving are second nature, as is the ability to maintain focus and deliver quality results under dynamic conditions.

Worried that you don’t meet all the desired criteria exactly? At Vodafone we are passionate about empowering people and creating a workplace where everyone can thrive, whatever their personal or professional background. If you’re excited about this role but your experience doesn’t align exactly with every part of the job description, we encourage you to still apply as you may be the right candidate for this role or another opportunity.

• Award-winning work environment -certified #1 Top Employer in Greece
• Competitive pay, bonus & remuneration package
• Private Health & Medical Insurance
• Hybrid way of working: a blend of remote and office-based working, including the option to work from abroad
• Unlimited connectivity with our mobile, landline and Vodafone TV services – Experience first what our customers love
• Unlimited access to learning resources and trainings
• Vodafone Parental Leave: 16 weeks of fully paid parental leave to all employees regardless of gender, sexual orientation or length of service
• Remote work equipment to help you create a comfortable, ergonomic workspace at home 
• Spirit of Vodafone days: dedicated time to pause, develop new skills and connect with our teams, values and services
• Extra days off: Vodafone Day, Family Day, Volunteering Day 
• Office amenities (subject to the office location): such as restaurant, beauty corner, gym and parking
• Special employee offers and discounts
   
  
  #LI-Hybrid #Vodafonespirit #Togetherwecan 

We are a leading international Telco, serving millions of customers. At Vodafone, we believe that connectivity is a force for good. If we use it for the things that really matter, it can improve people's lives and the world around us. Through our technology we empower people, connecting everyone regardless of who they are or where they live and we protect the planet, whilst helping our customers do the same.

Belonging at Vodafone isn't a concept; it's lived, breathed, and cultivated through everything we do. You'll be part of a global and diverse community, with many different minds, abilities, backgrounds and cultures. ;We're committed to increase diversity, ensure equal representation, and make Vodafone a place everyone feels safe, valued and included.

If you require any reasonable adjustments or have an accessibility request as part of your recruitment journey, for example, extended time or breaks in between online assessments, please refer to https://careers.vodafone.com/application-adjustments/ for guidance.

Together we can.