Nestor Campos, a software engineer from Chile, shares his experience learning MongoDB through MongoDB University, which helped him stay relevant in the market by providing an alternative to relational databases. He found MongoDB's simplicity and ease of use appealing and enrolled in the M101P course after experimenting with NoSQL databases. After completing the certification program, he gained new skills that allowed him to give back to the community, teach workshops on Big Data, and lead large projects involving social network data collection and manipulation, solidifying his position as a MongoDB Developer. His journey showcases how MongoDB University's courses and certification can help individuals build new skills and achieve career growth.