|Date of birth||23 September 1987|
|Place of birth||Nowy Sącz, Poland|
|Height||1.81 m (5 ft 11 1⁄2 in)|
|Sandecja Nowy Sącz|
|2004–2005||Sandecja Nowy Sącz|
|2009–2010||→ Lokeren (loan)||31||(14)|
|2010||→ Germinal Beerschot (loan)||11||(3)|
|2011||→ Korona Kielce (loan)||7||(0)|
|2011||→ PFK Oleksandria (loan)||3||(0)|
|2014||→ Piast II Gliwice (loan)||13||(4)|
|2016–2017||Sandecja Nowy Sącz||8||(2)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 3 January 2017|
On 12 July 2007 he signed a 5-year contract with CSKA Moscow, having impressed the club's scout at the 2007 FIFA U-20 World Cup. He scored his first goal for the Russian side on 8 August 2007 in a Russian Cup win against FC Khimki (2–0). His first league goal came on 2 September 2007 to earn a 1–1 tie against FC Spartak Moscow. On 23 October 2007 he made his first appearance in the UEFA Champions League, coming on in the 76th minute of the 1–2 loss against Internazionale. He won the 2007–08 Russian Cup with CSKA, converting his penalty during the penalty shootout. As of January 2009, all of his appearances in the Russian league have been off the bench.
In January 2009, he joined KSC Lokeren on loan until the end of the season. He scored on his debut for Lokeren on 14 February, leading to a 2–1 win against K.S.V. Roeselare. In March 2009, the loan was extended until the end of the 2009–2010 season, with CSKA Moscow having the right to recall Janczyk during the winter. In January 2010, he joined Germinal Beerschot on loan until June 2011 with a buy option.
In November 2010, he and Germinal agreed by mutual consent to end his loan agreement early, the manager having given him no playing time in the 2010–11 season. With CSKA Moscow's consent, he began training at Legia Warsaw. In February 2012, he played in a trial game for Irish side Limerick and scored a goal.
In October 2018, he joined Odra Wodzisław and played until 19 April 2019.
He has also represented Poland at the junior level, scoring a hat trick against Belgium at the 2006 UEFA U-19 Championship. At the 2007 FIFA U-20 World Cup, he notched 3 goals in 4 games. Argentina had not conceded any goals in the tournament until Janczyk finally scored against them in the second round.
In April 2008 Polish national team coach Leo Beenhakker named Janczyk in a preliminary group of 31 players for Euro 2008. However, Janczyk did not make the cut when the group was reduced to the final squad of 23. He made his first appearance for the Polish national team during a friendly against Serbia in December 2008.
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Janczyk and fiancée, Dominika, have a daughter, Wiktoria, born in 2010.
- Komunikat‚ odra.wodzislaw.pl, 19 April 2019
- "CSKA Moscow clinch Janczyk deal". FIFA.com. 13 July 2007. Retrieved 14 February 2009.
- Piotr Koźmiński (19 January 2009). "Poland's Jańczyk raring to go at Lokeren". UEFA.com. Retrieved 14 February 2009.
- "Poolse spits Dawid Janczyk naar Germinal Beerschot". Gazet Van Antwerpen. 15 January 2010. Retrieved 15 January 2010.
- Pawel Dimow (16 April 2008). "Janczyk in line for dream EURO call". UEFA.com. Archived from the original on 5 December 2008. Retrieved 14 February 2009.
- "Dawid Janczyk : Tak źle jeszcze nie było". sports.pl. 13 November 2010. Archived from the original on 17 July 2011. Retrieved 13 November 2010.