Consulting expertise and exhaustive experience in:

• C, C++, UNIX, Linux, TCP/IP, Shell, design and internals of UNIX-like systems.
• Python (FastAPI, Flask, asyncio, efficient and well-built (micro)services).
• Data structures and algorithms, high concurrency, cryptographic engineering.
• Quality software design, high performance, scalability and low latency.
• Key-value stores, caches, databases, distributed systems.

Data structures and algorithms implemented to solve your problem, including bespoke as well as the state of the art solutions. Track record:

• Concurrent trie-hash map
• Quiescent-State and Epoch based reclamation library
• Robin Hood hash map
• TLSF: two-level segregated fit O(1) allocator
• Longest Prefix Match (LPM) library
• Lock-free multi-producer single-consumer (MPSC) ring buffer
• Tick-based timer mechanism (hierarchical timing wheel algorithm)
• ...

Products and applications we provide:

• nxsearch: a full-text search engine; supports BM25 and TF-IDF algorithms, integrates with the Snowball stemmer, supports fuzzy matching (using the BK-tree with Levenshtein distance).
  
  
• npf: a layer 3 packet filter, supporting stateful packet inspection, IPv6, NAT, IP sets, extensions and many more; it was designed with a focus on high performance, scalability, multi-threading and modularity.
  
  
• rvault: a secure and authenticated store for secrets (passwords, keys, certificates) and small documents; it uses envelope encryption with one-time password (OTP) authentication; provides userspace file system.