LHCb results on $C\!P$ violation in $B^0_{(s)}$ mixing and in the interference with decays

Measurements of $C\!P$ violation in neutral $B$ meson mixing and in the interference with decays are excellent probes to search for physics beyond the Standard Model. A selection of recent measurements performed by the LHCb experiment using the full Run I dataset is presented. These are a measurement of $C\!P$ violation in the $B$ to double charm decay $B^0\to D^+D^−$, the first measurement of the $C\!P$ violating phase $\phi_s$ using $B_s\to\psi(2S)\phi$ decays, and a measurement of the $C\!P$-even $B_s$ lifetime in $B_s\to J\!/\!\psi \eta$ decays. Unprecedented flavour tagging performance is achieved in the $B^0\to D^+D^−$ decay thanks to new flavour tagging methods.