An Autonomous Agents developer designs, builds, and tests software agents that operate without human intervention. These agents can make decisions, learn from experiences, and adapt to changing environments. The developer's tasks include programming the agent's decision-making algorithms, integrating it with sensors and actuators for interaction with its environment, and implementing machine learning techniques for the agent to improve its performance over time. The developer also ensures the agent can achieve its goals effectively and efficiently, while maintaining safety and ethical standards. They work in various fields such as robotics, gaming, and artificial intelligence.