Kamarai Swyer is a Redbridge-born winger who joined West Ham United's Academy of Football at the age of eight.

After signing a two-year scholarship in 2019, Swyer made his U18 Premier League South debut in a 2-1 home win over Swansea City in August of that year, aged 16 years and eight months. He would go on to make his FA Youth Cup debut in a third-round defeat by Charlton Athletic in December, and scored five goals and assisted two in 12 appearances in all competitions.

On his 18th birthday, 4 December 2020, Swyer signed his first professional contract with the Club, having debuted for the U23s in a Premier League 2 draw with Blackburn Rovers six weeks previously. In total, the wideman made 28 appearances across all age-groups, scored two goals and assisted four.

Swyer scored his first goal at development level with a header against Everton in a Premier League 2 fixture in October 2021 - one of six goals he scored in 32 appearances at that level in 2021/22. 

The winger would kick on in 2022/23, becoming a senior figure for the U21s and scoring seven goals in 27 appearances in all competitions. His development squad form saw Swyer earn his first team-debut, playing 13 minutes as a substitute in the 3-0 win at FCSB in the UEFA Europa Conference League group stages.

Either side of that appearance, Swyer was in the senior matchday squad for the Conference League qualifying round second leg tie away to Viborg FF in August 2022, and the FA Cup ties against Brentford and Manchester United in early 2023.

After appearing for the senior side on pre-season tour in Australia in July 2023, the Academy graduate joined EFL League Two club Crawley Town on a season-long loan. Swyer would make eleven appearances for the Reds before being recalled for his loan in January, recording six goal contributions in 12 Premier League 2 appearances for West Ham United's U21s.