My answer is based on my knowledge of the french hiring market, mainly in engineering, computer engineering/science.
1 year, and specifically 1 year before you end your senior year, is too early. For various reasons: most companies don't plan their recruitment so early, also, since you cannot give any idea of your technical level/grades for the final year you won't be able to give tangible facts to the targeted companies, etc.
However, it is not too early to start looking for an internship (basically, big companies are hiring a similar number of interns each year, regardless of the market needs) and to start building a professional network. Work on your resume, start a blog, polish your best computer engineering projects and transform them into open source software, go to (professional) conferences and event, ask for mentoring to professionals you know. If you do that, finding a job quickly will be easier.