Leveraging an extensive six years of experience in web development mainly with Django, JavaScript, and Node.js, I am confident in my ability to bring your blockchain-based carpooling vision to life. While my technology stack doesn't include Ethereum per se, I assure you that my familiarity with utilizing blockchains within a web application setting will translate smoothly into the world of smart contracts and Ethereum.
Having developed numerous applications with security as their core, I understand the importance of safeguards in handling user data. A key strength that I bring to the table is my deep knowledge of encryption and security protocols which when blended with your need for transparency and decentralization offers a compelling synergy. Though I haven't specifically created a carpooling system before, my in-depth understanding of the project requirements coupled with my proven ability to quickly adapt to new domains will ensure the development process remains efficient while retaining optimal data security.
To summarize, with my substantial experience in web app development, proficiency in key technologies such as Django, JavaScript and Node.js, and a knack for building defensible systems; I am confident in saying that selecting me for this project will offer assurance around quality, timeliness and excellence. Let's build an innovative carpooling solution together where user data safety meets efficient transportation!