This is an extremely interesting question in general.
In simple word, 'No'. Higher education is not necessary to be successful and build a career. To name a few, Bill Gates, Rockefeller, Edison, Benjamin Franklin, Richard Branson. Then again these people we must admit have been blessed with superb talent and luck.
Now to answer your question.
Masters degree in any discipline / field is for students who would like to go for higher studies and choose a profession like being a professor or anything associated with education / teaching / research. So if that is what you would like to do, you need to complete M.Tech.
In case you want to take a job along your lines of specialization then you can start applying for a job and further improve and hone your skills based on the opportunities your job will offer you.
These days many companies further train their employees and also offer education allowances.
By working you will gain work experience, find your true calling and can get reimbursed for further education. For example may be after few years you would want to be a project manager and in that case you must get a PMP certification.
My suggestion will be:
Go for your Masters only if you want to and if you love studying for its own essence and most importantly if you can afford it more in terms of time than money. There is nothing like a solid education background.
However career wise I would say, get a job, work for two years, and evaluate yourself: whether you would like to take a break to study or continue working. If latter, find out new skills that will improve your position and get a degree or certification accordingly e.g. MBA, PMP, new updated technical skill etc.
All the best in your career !