Santex is a technology company with more than 25 years of experience in developing custom business software. We have a global network of talent and offer flexible remote work options. We are present in 100 cities in 16 countries and have experience in various industries such as health, finance and fintech. We collaborate with leading brands and have helped our clients achieve their goals by delivering innovative solutions that exceed expectations. Our mission is to help organizations grow and succeed through technology, building sustainable organizations and helping businesses run more efficiently.

Job Description: We are looking for a Senior AI Developer to join our team—someone with an agile mindset and a strong focus on rapid prototyping to support the design, development, and validation of AI Proofs of Concept (PoCs). This role is critical to accelerating technological exploration and providing technical support for internal initiatives that involve conversational agents, RAG systems, and model training.

The selected candidate will also actively contribute to AI-based solution development for internal products and may be assigned to client delivery projects based on business needs. We are seeking a versatile profile, able to adapt to changing contexts, solve emerging challenges, and collaborate across multiple teams including Product, Sales, and Technology.

Responsibilities:

• Design, build, and validate AI PoCs quickly and effectively
• Contribute to identifying AI application opportunities in internal products
• Provide technical support for internal developments integrating AI, working with internal/external resources and technology teams to improve or add new capabilities
• Collaborate with cross-functional teams to implement conversational agents, RAG systems, and other AI-driven solutions
• Train models and fine-tune pipelines according to business or user needs
• Develop and maintain frontend and backend components required to integrate AI solutions
• Work with Sales and Growth teams to estimate time, technical profiles, and capabilities for AI project proposals
• Support hiring processes by evaluating AI-focused candidates for internal and client-facing projects
• Document key learnings, decisions, and explored approaches to encourage continuous improvement and reuse
• Participate in internal initiatives and, when needed, join client projects in a technical AI-focused role

Requirements:

Technical skills

• Programming Languages: Python
• Machine Learning Tools: TensorFlow/PyTorch, LlamaIndex, scikit-learn
• Deep understanding of Deep Learning techniques and transformer architectures (e.g., BERT, GPT)
• Experience working with large datasets and data processing techniques (Data wrangling, ETL)
• Knowledge of cloud environments such as AWS
• Familiarity with language models and advanced NLP techniques
• Experience in training and fine-tuning LLMs, classifiers, embeddings, RAG models, etc.
• Full-stack development experience with at least one modern tech stack

Soft Skills

• Ability to work under pressure and in uncertain contexts (IMPORTANT)
• Strong analytical skills and ability to estimate technical effort (IMPORTANT)
• Proactivity in proposing ideas and solving problems independently
• Critical thinking with a results-oriented mindset
• Flexibility and adaptability to new technologies and changing directions
• Strong collaboration skills with product, design, sales, and engineering teams
• Excellent communication skills, both oral and written, for technical and non-technical audiences

Desirable:

• Previous experience working with product or innovation teams
• Participation in hackathons, innovation labs, or R&D environments
• Contributions to open-source projects or technical publications
• Intermediate to advanced English proficiency with ability to hold fluent technical conversations

Advanced English:

• Excellent verbal and written communication skills in English.

Required Location:

• Argentina or Perú