Walker-Diallo started her legal career as a litigation associate at Milbank LLP. She then joined the New York City Law Department where she defended the City of New York, its agencies and high-level employees in cases brought under various federal, state and city laws. Walker-Diallo also became the head of the George Walker Jr. Community Coalition, Inc., named after her father. At GWJrCC, she created the first youth court in East New York. During this time, Walker-Diallo also served as a part-time Administrative Law Judge/Hearing Officer with the New York City Office of Administrative Trials and Hearings and practiced law in her own firm, The Law and Mediation Offices of Carolyn Walker-Diallo, Esq., PLLC. Walker-Diallo also served as a volunteer mediator with the New York Peace Institute. In 2013, Walker-Diallo joined Brooklyn Community Services. As the organization's General Counsel and Chief Compliance Officer, she served on the Executive Team and handled all legal matters involving the agency.
Community involvement
Walker-Diallo served as a Board Member of the East New York Restoration Local Development Corporation, aMember of the 75th Precinct Community Council, and was Founder and Troop Leader of several Girl Scout Troops in East New York and Cypress Hills. On February 15, 2015, Walker-Diallo received the Distinguished Service Award by New York Assembly Members Charles Barron, Erik Dilan, and Samuel D. Roberts at the New York State Association of Black and Puerto Rican Legislators’ 44th Annual Award Ceremony.
Civil Court Judge
Walker-Diallo launched her campaign for Judge in December 2014. She was rated Qualified by the Kings County Democratic Screening Committee. She was also approved by the New York City Bar Association's Screening Committee. She ran unopposed in the general election on November 3, 2015. On December 10, 2015, Walker-Diallo was sworn in as a Civil Court Judge at Brooklyn Borough Hall. Soon after her inauguration, Walker-Diallo started receiving death threats, possibly due to swearing in on a Quran. At the end of 2015, Walker-Diallo was recognized as one of 10 Muslim women who ruled 2015. Walker-Diallo assumed the bench on January 1, 2016.
On April 20, 2016, the Muslim Bar Association of New York honored Walker-Diallo with the Legal Trailblazer Award.
In December 2018, Walker-Diallo was appointed Supervising Judge of the New York City Civil Court, Kings County, effective January 1, 2019. In 2019, she was also recognized as one of Crain's 2019 Notable Women in Law.