An Attivio Developer works on the Attivio platform, an advanced enterprise search and data discovery tool. They are responsible for designing, implementing, and maintaining Attivio applications and solutions. This includes indexing and querying data, creating search interfaces, and integrating data sources. They also work on tuning search relevancy and performance, ensuring that the system is optimized for fast and accurate data retrieval. Additionally, they may work on developing machine learning models for predictive analytics within the Attivio platform. They collaborate with other IT professionals to understand user requirements and deliver solutions that meet business needs.