[12] Freier worked first as a legal secretary, and, in 1994, as a paralegal at law firm Willkie Farr & Gallagher,[12] in order to support her husband in kollel.

[5][15] Freier also had a law office in Monroe, New York, where she did business with Hasidic residents of nearby Kiryas Joel.

[9] In December 2017, Megyn Kelly welcomed Freier to the Today Show[39] as the woman The New York Times has called “the Hasidic superwoman of night court”; she was featured in the series “She’s Got Faith,” marking her one-year anniversary on the bench.

[43][44][45] In August 2023, Freier was nominated as a Supreme Court Justice candidate for a 14-year term, the vote was conducted by Brooklyn District Leaders at the Judicial Convention.

[48] On November 15, 2023, Freier was sworn-in by New York Attorney General Letitia James as Supreme Court Justice of NY.

In 2005, Freier established Chasdei Devorah, Inc.,[53] a non-profit charity organization to help poor Jewish families, in memory of a young friend.

[58] In 2010, Freier advocated to save Breslov Yeshiva in Williamsburg, in spite of opposition from some who harassed the students and maligned the Rabbi, Yoel Roth.

[60] In 2011, she founded Ezras Nashim, an all-female Orthodox Jewish volunteer EMT ambulance service established with the goal of preserving women's modesty in emergency medical situations, especially childbirth.

[16][55][62] She has served on Borough Park's Community Board 12, and performed pro bono legal services for the New York City Family Court.

[75][76][77] In September 2018, Freier was named by the Algemeiner Journal among the "J100" list of "top 100 people" positively influencing Jewish life.

[80] In October 2018, Freier was inducted into the Brooklyn Jewish Hall of Fame;[81] she received an award recognized among the leading Brooklynites.

[83][84] In January 2020, Freier along with a delegation of Ezras Nashim members were recognized in front of the entire New York State Assembly in the Assembly Chambers of the New York State Capitol Building in Albany, a resolution was passed recognizing the EMT members for their volunteer efforts of preserving women’s dignity during emergencies,[85] Freier and the delegation had afterwards a private meeting with New York Governor Kathy Hochul in the Capitol Building.

[90] Freier also speaks at Chabad Centers[91] all over the world, inspiring Jewish woman bringing them closer to Judaism known as the "Kiruv Movement".