He was a founder of Treeworks, Zelist Monitor, and Geeks for Democracy, a specialist in online communication and digital communities, and he was an Eisenhower Fellow 2020.

[8] In June 2021, following dialogue with the Save the Children-Romania NGO, Tenita drafted and submitted as a co-initiator the legislative proposal (PL-x no.

These laws establish the prohibition of individuals sentenced to imprisonment from running in local and parliamentary elections, partially achieving the goal of the "No Criminals in Public Office" campaign.

[16] In response to this highly damaging situation for the psychological development of hundreds of thousands of young people, Deputy Teniță initiated the bill with the goal of amending the Penal Code.

[17][18] The new regulation stipulated that, in cases where teaching staff in higher or secondary education commit sexual abuses against pupils or students, the special limits of the penalty will be increased by a third.

In 2022, Teniță submitted a legislative project (Pl-x L735/2022[21]) to restructure the European Union's School Program in Romania, known as "Cornul și laptele", into a modern program updated to the development level of Romanian society, focusing on healthy nutrition and nutritional education, named "Healthy Breakfast".

468/2022[30] (submitted on March 22, 2022): A legislative proposal to create a legal framework aimed at reducing the risk of human trafficking, particularly of women and refugee children.

412/2022[31] (submitted on April 11, 2022): A legislative proposal "Solidarity with Ukraine for banning the import and intra-community acquisitions of oil, natural gas, coal, and nuclear fuel from the Russian Federation during the unprovoked aggression against Ukraine"[32][33] Cătălin Teniță is the founder and president of the Romanian branch of the European Parliamentary Forum for Sexual and Reproductive Rights (EPF).

Under Teniță's leadership, the Romanian branch has held conferences and events addressing key issues like HPV vaccination,[35] gender equality, and improved HIV patient care.

In July 2023, Teniță was elected to EPF's executive committee,[36] enabling greater influence in shaping and advocating European-level policies on health and sexual and reproductive rights.

In the summer of 2016, he co-founded a civic affinity group called Geeks for Democracy, which became a non-profit association with legal personality in 2018.

[39] Over time, Geeks for Democracy has carried out, either in its own name or in coalitions with other associations and groups, civic actions such as: In 2019 he was selected by Eisenhower Fellowships, Philadelphia as a Global Fellow 2020.