Born in Saikul, Manipur, Doungel has the ability to play as a winger or as a striker. Starting off at the JCT youth academy, Doungel joined East Bengal as a 17-year-old, scoring 4 goals for the Red and Golds. Doungel joined the Pailan Arrows before moving to Shillong Lajong.
Len also played for NorthEast United in the first season of the ISL, before joining Bengaluru, Delhi Dynamos and Kerala Blasters in latter seasons. Len is also an India international, having debuted for the national team at the Intercontinental Cup in 2018.