Janek is the founder of the communication agency Powerhouse, which topped Äripäev’s list of public relations companies in 2021. He graduated from the School of Law at the University of Tartu in 1999. His career includes working for the Äripäev business daily (1994–1997), serving as vice-president of SEB bank (1997–2000), directing the Internet gateway for the Eurovision Song Contest for ETV (2001–2002), and hosting the finance program Miljon senti (“One Million Cents”) in 2008. Since 2005, he has been the chairman of the supervisory board of the Tallinn Children’s Hospital Foundation.

In 2014, Janek co-founded the “Gift of Life” Cancer Treatment Foundation with Hille and Toivo Tänavsuu. In 2018, alongside Indrek Laul, Väino Kaldoja, and Urmas Viilma, he founded the Church Fund (Estonian Evangelical Lutheran Church Support Fund), where he serves as director. He served as president of the European Draughts Federation (1999–2015), European Draughts Confederation (2007–2017), and World Draughts Federation (2017–2021). From 2015 to 2019, he was the deputy chairman of the board of curators of the Estonian Academy of Arts.

From May 2, 2018, to April 29, 2019, Janek was a member of the Government of the Republic of Estonia, serving as the Minister of Public Administration. In this role, he was responsible for overseeing regional development, public sector reforms, and local government affairs. He focused on improving public services, advancing digital governance, and enhancing administrative efficiency within the government.