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Choose Between Python, Java, and C++ for a Service

Akuna CapitalSoftware Engineer · HR Screen
HardSoftware EngineerHR ScreenSoftware Engineering Fundamentals

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This question tests your understanding of language-level performance characteristics, memory management, and development velocity trade-offs in a distributed systems context.

The Scenario

You are a lead engineer at a proprietary trading firm. You are tasked with selecting programming languages for three distinct components of a new platform. The team consists of 15 engineers with varying levels of experience in Python, Java, and C++.

The Three Components

  1. Integration Gateway: A lightweight API-heavy service that aggregates data from several third-party REST/gRPC endpoints and triggers internal automation workflows. This service requires rapid feature iteration.
  2. Order Management System (OMS): A large, high-throughput business logic service that maintains the state of thousands of concurrent client orders, enforces complex compliance rules, and persists data to a distributed database.
  3. Market Feed Parser: A mission-critical component that ingests raw UDP multicast market data, performs nanosecond-level decoding, and pushes updates to the trading engine.

The Task

For each component, select the optimal language from the set {Python, Java, C++}. Justify your choices based on:

  • Performance and hardware-level control.
  • Memory management and garbage collection impact.
  • Development velocity and ecosystem/library support.
  • Hiring and maintenance constraints.

Structure your response by presenting your chosen architecture and explicitly addressing why the rejected languages were unsuitable for each specific use case.

Hints

Hint 1

Consider how Java's Garbage Collection (GC) pauses might affect the predictability of the Market Feed Parser versus the OMS.

Hint 2

Think about the difference between 'time-to-market' requirements for the API Gateway and the strict latency requirements of the Feed Parser.

Hint 3

Evaluate how each language manages complex concurrency and shared state, and how that impacts the reliability of the Order Management System.

Follow-up questions

  • How would your architectural choices change if we needed to deploy these services in a highly resource-constrained edge environment?
  • If the team was strictly comprised of Python developers, how would you mitigate the performance risks of building the Market Feed Parser in Python?
  • How do you handle cross-language interoperability (e.g., FFI/JNI) if you decide to build the hot path in C++ and the business logic in Java?