Data Scientist | LLM Engineer

NIF; Lisboa; Presencial; EUR 60 000 - 100 000; Tempo integral

Vantagens oferecidas por esta oferta de emprego

Flexible work arrangements

Professional development opportunities

Flat structure

Resumo da oferta

TEKEVER in Lisboa, Portugal seeks a Data Scientist specialized in LLMs to design, implement and optimize advanced AI models for decision support and mission planning. You will work across data processing, model training, and deployment, collaborating with engineers and product teams to deliver robust NLP solutions.

The role emphasizes cutting-edge LLM work, RAG/agentic systems, and ML experimentation, with a strong focus on innovative AI capabilities and production readiness.

Qualificações

• Bachelor’s or Master’s degree in Computer Science, Data Science, or related field; PhD is a plus.
• 3+ years of data science experience focusing on LLMs and NLP.
• Proficiency with Python and NLP/LLM libraries such as spaCy and Hugging Face.

Responsabilidades

• Design, develop and implement state-of-the-art algorithms for language models.
• Develop new AI-based capabilities for decision support and mission planning.
• Train and optimize large language models and preprocess data for training and evaluation.
• Collaborate with data engineers, software developers and product managers.
• Evaluate model performance and iterate to improve accuracy and efficiency.
• Deploy models into production and maintain documentation.

Conhecimentos

Python programming

NLP / LLM

LangChain

Hugging Face

PyTorch

MLOps

Docker / Kubernetes

Vector databases

Experiment tracking

Formação académica

Bachelor’s or Master’s in CS / DS

Ferramentas

LangChain

LlamaIndex

LangGraph

Qdrant

Weaviate

pgvector

Ollama

Descrição da oferta de emprego

Mission:

As a Data Scientist specializing in LLM you will be responsible for developing, implementing and optimizing advanced algorithms, models and capabilities that help our teams (e.g. Field Operations) automate their workloads, e.g. in the context of decision support, mission planning and situational awareness. You will work on a variety of projects that involve understanding, processing and generating human language to solve complex problems and create innovative solutions. The ideal candidate will have a strong background in LLMs, machine learning and data science, with a proven track record of successful projects in these domains.

What will be your responsibilities:

• Algorithm Development: Design, develop and implement state-of-the-art algorithms and models, within the context of language models.

• Capability Development: Realize new AI-based capabilities in areas such as decision support, mission planning, workflow automation.

• Model Training and Optimization: Train and optimize large language models using vast amounts of textual data, ensuring high performance and accuracy.

• Data Preprocessing: Perform data preprocessing tasks such as tokenization, stemming, lemmatization and normalization to prepare datasets for training and evaluation.

• Research and Innovation: Stay current with the latest advancements in LLM and Natural Language Processing (NLP) and apply new techniques to improve existing models and develop new solutions.

• Collaboration: Work closely with data engineers, software developers, product managers and other stakeholders to understand project requirements and deliver effective solutions.

• Performance Evaluation: Evaluate the performance of models using appropriate metrics and techniques and iteratively improve their accuracy and efficiency.

• Deployment: Collaborate with engineering teams to deploy models into production environments and ensure their robustness and scalability.

• Documentation: Maintain comprehensive documentation of models, algorithms and processes for future reference and reproducibility.

Profile and requirements:

• Education: Bachelor’s or Master’s degree in Computer Science, Data Science, or a related field. A Ph.D. is a plus.

• Experience: 3+ years of experience in data science, with a focus on large language models and NLP.

Technical Skills:

• Strong programming skills in Python, with experience using NLP and LLM libraries such as spaCy, Hugging Face (Transformers, Datasets, PEFT, TRL) and the major model families (e.g. GPT, Claude, Gemini, Llama, Mistral, Qwen, Gemma) via both API and open weights.

• Proficiency in deep learning frameworks, primarily PyTorch (plus Keras/TensorFlow as needed), and familiarity with inference optimisation (quantisation, TensorRT-LLM).

• Experience with data preprocessing, curation and tokenisation for LLM workloads, including building and cleaning datasets for fine-tuning and retrieval (chunking, embeddings, deduplication, synthetic data generation).

• Solid understanding of transformer architectures and attention, with working knowledge of fine-tuning and alignment techniques (full fine-tuning, LoRA/QLoRA, instruction tuning, RLHF/DPO). Exposure to RNNs and CNNs is a plus rather than a core requirement.

• Experience training and fine-tuning LLMs and building RAG and agentic systems, including orchestration frameworks (LangChain, LlamaIndex, LangGraph), vector databases (e.g. Qdrant, Weaviate, pgvector) and tool/function calling.

• Experience with experimentation and tracking tooling: Jupyter notebooks plus experiment and prompt tracking (MLflow, Weights & Biases) and LLM evaluation (e.g. Ragas, LangSmith/Langfuse, custom eval harnesses).

• Familiarity with cloud platforms (AWS, Azure, Google Cloud) and their AI services, with a focus on Google Cloud (Vertex AI, model garden, managed endpoints).

• Experience deploying self-hosted and open-weight LLMs in production, using serving frameworks such as vLLM, TGI, Ollama or llama.cpp, with awareness of GPU sizing, quantisation formats (GGUF, AWQ, GPTQ) and on-prem or airgapped constraints.

• Working knowledge of MLOps/LLMOps and DevOps practices: Git, CI/CD, containerisation (Docker, Kubernetes), plus telemetry, monitoring and observability for model and inference performance.

• Analytical Skills: Excellent analytical and problem‑solving skills with the ability to design innovative solutions to complex problems.

• AI Ethics and Bias Mitigation: Experience or awareness of AI ethics, fairness and bias mitigation strategies, in the context of NLP and LLMs.

• Communication: Strong verbal and written communication skills, with the ability to explain complex technical concepts to non-technical stakeholders.

• Collaboration: Ability to work effectively in a collaborative, cross-functional team environment.

• Attention to Detail: High attention to detail and a commitment to ensuring the accuracy and quality of work.

• Adaptability: Ability to thrive in a fast‑paced, dynamic environment and manage multiple projects simultaneously.

What we have to offer you:

• An excellent work environment and an opportunity to create a real impact in the world;

• A truly high‑tech, state‑of‑the‑art engineering company with flat structure and no politics;

• Working with the very latest technologies in Data & AI, including Edge AI, Swarming - both within our software platforms and within our embedded on-board systems;

• Flexible work arrangements;

• Professional development opportunities;

• Collaborative and inclusive work environment;

• Salary compatible with the level of proven experience.

Pre-Employment Requirements

Employment offers may be contingent upon successful completion of a background check and reference verification, in accordance with applicable laws and company policy.

Equal Employment Opportunity

TEKEVER is an Equal Opportunity Employer. We consider all qualified applicants without regard to race, color, religion, sex (including pregnancy, sexual orientation, gender identity, and gender expression), national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by federal, state, or local law.

Do you want to know more about us ?

Visit our LinkedIn page at https://www.linkedin.com/company/tekever/