A Hevacomp developer works on Bentley Hevacomp, a software used for building services design, including electrical and mechanical systems. Their duties include developing and updating the software's features, fixing bugs, and ensuring its smooth operation. They work on creating simulation models for HVAC systems, lighting, and energy consumption to aid architects and engineers in designing energy-efficient buildings. They need a strong understanding of building engineering concepts and proficiency in programming languages. Additionally, they liaise with clients and professionals in the construction industry to understand their needs and translate them into software solutions, helping to optimize building performance.