Airbnb, Palantir, and Lyft Referrals

Hi, I have more than 1.5 yoe as a full-time software developer at a quant trading firm. I graduated from a top-notched university. I have experience in backend development in C++ (proficient in C++17 features), C and Python. I am also familiar with the Linux kernel, TCP/UDP stack, and CPU caches. I applied to multiple positions at these companies, but didn't hear back. It seems it is hard without a referral. Please let me know if you can refer me. I'm happy forward my resume and discuss my interests/experience.