A Willowbrook, IL-based veteran-owned company is seeking a Senior Java Engineer to reinforce and enhance its suite of real-time applications used in security environments, including defense, critical infrastructure, and nuclear security. This role is central to the company's mission of modernizing legacy systems with a focus on performance, scalability, and reliability. This is a full-time, onsite position (5 days/week) where you'll work alongside a small, dedicated team of engineers. It's a gre