Task-based language learning (TBLL) has heavily influenced syllabus design, classroom teaching, and learner assessment in a foreign or second language teaching context. In this English as foreign language (EFL) learning environment, the paper discussed an innovative language learning pedagogy based on design education and technical writing. In this TBLL course, the language learning based assignments centered on designing and analyzing objects using various computer-aided design software and physical LEGO toolkit. The design software was used collaboratively and the design analysis was done mostly as group activities. The language production activities centered on technical document authoring, using collaborative online authoring tools for website hosting and note-taking for design projects, besides oral in-class presentations, and online posting in English. Language reception activities such as readings related to the course lectures, videos, assignment, and assessment instructions were hosted and linked from Moodle--the learning management system. This paper critically analyzed student performance with physical LEGO design and CAD software, including how student groups authored websites detailing the structural and functional specifications related to the product assembly procedure. This paper outlined how design pedagogy could be included in the curriculum while teaching English as a foreign language. In the process, students not only learnt about design fundamentals, but how to author complex technical documents in English. Findings based on course data and class interactions have adequately demonstrated that students were capable of handling the task-based language projects with reasonable efficiency and confidence.