Online judges are used to evaluate code submitted by users, under equal conditions for all. They have been used to judge programming competitions, as well as coding assignments within programming courses, allowing students to improve their coding abilities, as well as allowing instructors e.g. to analyze student profiles and detect topics that are challenging for students. Although several online judge platforms are available and can be used for students to practice their coding skills, most platforms in the market are limited in that they cannot support a large number of students simultaneously working on an assignment during a fixed time period, or can only do so at a significant cost, making the use of such systems in developing countries non-viable. This paper presents Blind, a platform developed in a university in the Global South, that is (1) cost-conscious, as we have incorporated several strategies to reduce its cost, (2) student-led, as we have empowered students and teaching assistants to lead its development and maintenance, and (3) highly simultaneous, as it allows over 1,000 students to work simultaneously on a timed assignment. This paper presents the platform, beginning with the needs of the course that motivated its development, as well as the lessons learned during its development and deployment, and its reception by the students of the course.