Unfold Agency interview questions

Truly the most unprofessional company I've ever encountered in over 20 years of working. They reached out to ask my availability and rate which I provided. They interviewed me and proceeded to offer me a job with no official paperwork. I told them I can't accept a job without a formal job offer. They strong me along for weeks continuing to claim the project was delayed and the paperwork was coming. Meanwhile, they asked me to start onboarding without pay or a signed contract. I told them I don't work for free and I'm happy to onboard when a formal offer letter is received. They then told me they were preparing paperwork but when I received it, the rate was 25% lower than initially discussed. When I followed up on why they drastically lowered the rate, and if we could meet in the middle, they ghosted me. They strung me along for month knowing from day one what my rate and availability was and then ghosted me when I held to it. This is NOT how a professional company operates. I will never apply there again. Amateur hour!