Hi Simone,
The best way to share a notebook with someone privately is to download the notebook, send it to your teammate, and then have them upload it to Research in their own account. When you are in the Research environment, you should open the notebook and then click Notebook --> Download as --> Notebook (.ipynb). Your teammate can then upload the notebook by going to their list of notebooks and clicking the upload button, which looks like a little cloud with an up arrow, immediately to the left of the blue '+' button.
We don't currently support real-time code collaboration/pair programming in the Research environment, but we do support it in the IDE. After your research, once you get to the point where you are writing an algorithm in the IDE, you and your teammate can work on coding the same algorithm, real-time. You can learn more about the IDE collaboration feature in this section of the documentation.
I hope this helps!
Disclaimer
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by Quantopian. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances.