Ryan Richter

On January 18, 2011, Richter was drafted as the 5th overall pick in the 1st round of the 2011 MLS Supplemental Draft by Philadelphia Union. After a successful preseason trial, he signed with the club on March 1, 2011. Richter was sent on a one-game loan to the Union's USL Pro affiliate Harrisburg City Islanders in June 2011; he made his professional debut for them on June 4, in a game against Charleston Battery. On July 21, 2011, Richter made his Union debut against Everton On August 24, 2011, Richter scored his first career goal for the Philadelphia Union against the Harrisburg City Islanders. The goal, assisted by Justin Mapp, came in the 49th minute. On January 19, 2012, Philadelphia declined his 2012 contract option and Richter was released. Richter trialled with D.C. United during February and March 2012.

Charleston Battery

Richter signed with USL Pro team Charleston Battery on March 27, 2012. In 2012, Richter helped the Charleston Battery capture the 2012 USL PRO Championship.

Toronto FC

He signed with Toronto FC on March 25, 2013. Richter made his debut for Toronto on April 13, in a 1–1 draw against Philadelphia, he came on as a first half sub for Darel Russell who sustained an injury. After spending most of the 2014 season on loan with NASL club Ottawa Fury FC, Richter joined them permanently on January 28, 2015.

Bethlehem Steel FC

In 2016, Richter was transferred back to the Philadelphia Union organization to play for the newly formed…

Following the 2017 season, Richter retired from the professional game to help coach the Philadelphia Union academy. In January 2022, Richter was promoted to assistant coach to Jim Curtin with the Philadelphia Union first team. Richter was named head coach of Philadelphia Union II in MLS Next Pro on January 15, 2025. On May 27, 2026, Richter was named interim head coach of the Union following the firing of Bradley Carnell.