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sales-intelligence

B2B contact and account intelligence

ZoomInfo, Apollo, 6sense

SystemTechniques · 25Primitives · 86 sales-intelligence Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›Usage meteringfinance · medium: Counting tokens/requests per user and key, aggregating for quotas and billing with idempotent eventsHTML main-text extractionmachine-learning · medium: Decode bytes, tolerate broken markup, drop non-content nodes and score text blocks by length and link density to keep the main run, with headings, metadata and offsets for citation.›Named entity recognitionmachine-learning · medium: Find the character spans of entities in text and give each a type, by labelling every token and decoding a valid label sequence.›Near-duplicate detection with MinHa…machine-learning · medium: Estimate set Jaccard similarity from k min-hashes and find similar pairs with banded LSH buckets; the standard dedup for web crawls, training corpora and sequence collections.›Text classificationmachine-learning · medium: Assign one or more labels to a text; climb a ladder from regexes to linear models on n-grams, embeddings, fine-tuned encoders and LLM prompts, only as far as the data and budget demand.›Fuzzy string matchingsearch-sort · low: Edit distance, Jaro-Winkler and trigram indexes for approximate name and address matchingRobots exclusion protocolsearch-sort · low: Decide per URL whether a crawler may fetch it from a host's robots.txt (RFC 9309): status-code rules, group choice, longest-match Allow/Disallow, 24 h cache.›URL normalizationsearch-sort · low: Rewrite a URL to one canonical key, in safe RFC 3986 steps plus lossy, site-dependent ones (tracking parameters, query order, fragments), and keep the original beside the key.›BM25 rankingsearch-sort · low: The standard lexical relevance score: IDF-weighted term frequency with saturation (k1) and length normalization (b); default in Lucene, Elasticsearch and SQLite FTS5.›Hdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesProcess supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›DNS message format and client looku…networking · low: Binary query/response format of DNS (RFC 1035) and how a stub client uses it: record types, name compression, UDP/TCP/EDNS sizes, TTL caching.›Longest prefix matchnetworking · low: IP prefix lookup structures (DIR-24-8, Poptrie, LC-trie) for routes, ACLs and geo-IPPublic Suffix Listnetworking · low: Find the registrable domain (eTLD+1) of a host name by matching the longest rule in a community-maintained list of shared suffixes.›Smtp protocolnetworking · low: SMTP/ESMTP sessions, pipelining, STARTTLS and reply codesAho-Corasick multi-pattern matchingsearch-sort · low: Find all occurrences of many fixed patterns in one pass over the text, in time independent of the pattern count, using a trie with failure links.›Time decay scoringsearch-sort · low: Scoring items by recency with exponential decay or half-life, combined with relevanceMutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Upsert mergestorage · low: MERGE/upsert by key with deduplication and late-arriving data rulesGraceful drainingsystems · low: On a termination signal, stop taking new work, finish in-flight work until a deadline, tell clients to reconnect elsewhere, then exit; clients resume from a token.›Cooperative schedulingconcurrency · low: Green threads/coroutines yielding at await points on a user-space scheduler+ 18 more techniques+ 70 more primitives

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