I am a middle backend engineer with 2 years of experience. I recently joined a very new startup(< 2 years) where my friend is my manager. He/she is a principal software engineer with 10+ years of experience. In the team, there are 2 other senior software engineers, each is 4 years older than me with 7-8 years of experience. When my friend invited me and interviewed me to join the company, he/she said that I might not be a senior yet, but he/she's sure that I will get to senior really soon because I have a habit of learning consistently.
Even though I only have 2 years of software engineering experience, I had previous 3 years of tech experience so I already know how to navigate company politics, communication, and have that business intuition. Also, in my previous company, I was the 1st backend engineer who had to build the codebase and infrastructure from scratch, so I am pretty confident that I am not a junior anymore. However, I understand that I still lack experience and knowledge on how to build clean code and how to build reliable and fault-tolerant system, and I feel like I could learn it from my manager, that's why I joined the current company.
The 1st senior engineer is pretty chill, he/she looks like he/she is not very ambitious to get impactful projects and looks like he/she's just happy to have a job to support his family. Besides, he/she joined the company 8 months earlier so I guess he/she already has some context. The 2nd senior engineer joined at the same time as me, and he/she looks pretty competitive. I feel like he/she's constantly sizing himself up against me and he/she's always making some little undermining comments such as "Are you used to code pairing? You look like you can't code", "Let me help you use a terminal", etc. Basically these comments are very subtle and masked as jokes or him trying to help me, but I sense that he/she's actually a bit intimidated by me.
My manager has a concept of "pairing", where he/she will split the team into 2 groups, and each group will work on a project for some time and then he/she will rotate it. In the 1st rotation, I was paired with the 1st senior and I did probably 70-80% of the project, but I was happy to do it because I learned a ton and my manager, during the 1-1 said that I was doing great and he/she told me he/she felt that the 1st senior is an underperformer. Despite this, I specifically let the 1st senior gave presentation of the project to the stakeholders because I felt that he/she helped me to onboard to the company so I'm ok with it.
The 2nd senior was paired with the manager and I felt that they did project that is much larger in scope and impact compared to me and the 1st senior. It means that now the 2nd senior has much more context than me. Right now I'm being paired with my manager, and the 2nd senior is paired with the 1st senior and I feel like I'm starting to get some context, but I'm just worried that when it comes time for me to get paired with the 2nd senior, he/she will hoard all the impactful projects and context and I will be stuck with really small scope. How to avoid the "rich gets richer, poor gets poorer" scheme? Thank you