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web services: very large HTML search engine service (500K document index, delivering results quickly within CONUS, C++, from scratch, sans OpenSSL), distributed system tracers, distributed KV stores, Django, Flask and golang services.
Operating system and userspace primitives: my own kernels(yato, rk), schedulers, MMUs, syscalls like fork(), exec(), mutex, CV, high performance memory allocators (replacing or intercepting malloc/free).
Network utilities: ping via ICMP, reimplemented TCP
Compilers: decaf language (targeting MIPS)
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