Here is the list of nginx contributors sorted by number of commits before nginx's team split in 2022:

$ hg log -b default | grep ^user: | sort | uniq -c | sort -nr | head

   3683 user:        Igor Sysoev <igor@sysoev.ru>

   1681 user:        Maxim Dounin <mdounin@mdounin.ru>

    630 user:        Ruslan Ermilov <ru@nginx.com>

    413 user:        Valentin Bartenev <vbart@nginx.com>

    226 user:        Roman Arutyunyan <arut@nginx.com>

    209 user:        Sergey Kandaurov <pluknet@nginx.com>

    120 user:        Vladimir Homutov <vl@nginx.com>

     45 user:        Piotr Sikora <piotr@cloudflare.com>

     40 user:        Piotr Sikora <piotrsikora@google.com>

     32 user:        Dmitry Volyntsev <xeioex@nginx.com>

Source: https://hg.nginx.org/nginx/

Valentin, Ruslan and Vladimir currently are working on Angie.

Igor actually doesn't contribute to nginx since 2012... there are only few small commits after these dates, most of his contributions are between 2002 and 2012.

Maxim now works on freenginx alone. And here is a response from an Angie developer about consolidation with freenginx: https://github.com/webserver-llc/angie/issues/74 - why it won't happen.