Kokocinski was born in Eslöv and started playing golf in the year 2000.

As a junior, he appeared for the Swedish National Team in the European Young Masters, the European Nations Cup – Copa Sotogrande, and the Junior Golf World Cup in Japan.

He shared training facilities at Eslöv Golf Club with Ludvig Åberg.

He made his European Tour debut at the 2016 Nordea Masters, where he finished tied 41st.

After the Asian Tour shut down in March 2020 due to the COVID-19 pandemic, Kokocinski competed the rest of the year on the Nordic Golf League and retired from professional golf at the end of the season.