A Java Developer designs, implements, and maintains Java applications that are often high-volume and low-latency, required for mission-critical systems. They contribute in all phases of the development lifecycle, writing well-designed, efficient, and testable code. They ensure designs are in compliance with specifications, preparing and producing releases of software components. They also support continuous improvement by investigating alternatives and technologies, presenting these for architectural review. Additionally, they transform requirements into stipulations and identify production and non-production application issues. Their role also involves developing, testing, implementing, and maintaining application software.