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wtf is exchange-order-matcher?

vladimirlogachev/exchange-order-matcher — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2026-03-28

★ 4ScalaAudience · developerComplexity · 3/5MaintainedSetup · moderate

TL;DR

A Scala 3 demo of a stock/crypto exchange order-matching engine that pairs buy and sell orders and tracks client balances.

Mindmap

mindmap
  root((repo))
    What it does
      Match buy sell orders
      Maintain order book
      Track balances
    Tech stack
      Scala
      Functional programming
    Use cases
      Learn order matching
      Study Scala patterns
      Portfolio reference
    Audience
      Trading platform builders
      Scala learners

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Study how an order-matching engine pairs buy and sell orders at compatible prices.

REASON 2

Learn functional programming patterns in Scala 3 using immutable data structures.

REASON 3

Use as a reference for building a trading or exchange platform.

REASON 4

See how a system rejects invalid orders gracefully instead of throwing errors.

What's in the stack?

Scala

How it stacks up

vladimirlogachev/exchange-order-matcherdhgarrette/scala-utilpigoz/katas
Stars446
LanguageScalaScalaScala
Last pushed2026-03-282018-04-242017-08-11
MaintenanceMaintainedDormantDormant
Setup difficultymoderateeasyeasy
Complexity3/52/51/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · moderate Time to first run · 30min

Coding-assessment demo project, not production-ready, reads orders from text files rather than a live feed.

Yoink these prompts

Prompt 1
Explain how the order matching logic in this Scala project decides when two orders execute a trade.
Prompt 2
Show me how immutable data structures are used to track client balances in this codebase.
Prompt 3
Walk me through how this project rejects invalid orders like insufficient funds or zero-price orders.
Prompt 4
Help me extend this order matcher to support a new order type, like stop-loss orders.

Frequently asked questions

wtf is exchange-order-matcher?

A Scala 3 demo of a stock/crypto exchange order-matching engine that pairs buy and sell orders and tracks client balances.

What language is exchange-order-matcher written in?

Mainly Scala. The stack also includes Scala.

Is exchange-order-matcher actively maintained?

Maintained — commit in last 6 months (last push 2026-03-28).

How hard is exchange-order-matcher to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is exchange-order-matcher for?

Mainly developer.

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