E Explainarium

Explainarium

Understand hard ideas, one calm step at a time.

103 concepts across 3 domains, each taught as an ordered path from first principles up. Pick a domain and follow the thread.

Domains

  1. English Mastery: B2/C1 to C2 59 concepts

    Closing the gap from an excellent non-native speaker to an educated native: grammar nuance, collocation, idiomatic naturalness, pragmatics, pronunciation, writing craft, and high-stakes communication, grounded in corpus evidence.

    • Foundations 5
    • Grammar 10
    • Vocabulary 7
    • Natural English 5
    • Pragmatics 6
    • Speaking 7
    • Writing 9
    • Communication 10
  2. Observability System Design 10 concepts

    Internal mechanics of custom distributed observability services: ingestion, storage, query, control plane, and platform services, taught at petabyte scale.

    • Ingestion 1
    • Storage 3
    • Query 2
    • Control Plane 2
    • Platform 2
  3. Trade Republic Senior Engineer 34 concepts

    Engineering judgement for succeeding as a Senior Software Engineer at Trade Republic: its company, financial domain, distributed-systems and data infrastructure, the real interview problems, and senior leadership behaviours.

    • Orientation 5
    • Financial Systems 5
    • Distributed Primitives 5
    • Data Infrastructure 4
    • System Design 6
    • Coding Patterns 4
    • Behavioral 5