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A lightweight AWS service emulator written in Go

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Awsim – Lightweight AWS emulator in Go (40 services in progress)

by sivchari·Feb 24, 2026·3 points·0 comments
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AI Analysis

●MidShip It

LocalStack alternative in Go, but LocalStack already owns local AWS testing with better service coverage.

Strengths
  • •Single binary distribution and no-auth design makes instant CI spinup trivial versus LocalStack Docker overhead.
  • •Rust-quality implementation language (Go) with explicit Phase 1/2/3 roadmap shows intentional scope management.
Weaknesses
  • •Only 5 core services implemented versus LocalStack's 200+; 40-service roadmap is aspirational without code.
  • •No persistence layer beyond in-memory storage—each test run loses state, making multi-step workflows impossible.
Target Audience

Backend engineers, DevOps teams, CI/CD pipeline maintainers

Similar To

LocalStack · Moto · MinIO

Post Description

I built awsim, a lightweight AWS emulator in Go for CI/CD testing.

Core services (S3, DynamoDB, SQS, Lambda, IAM) implemented, 40+ services in progress.

- Single binary, no auth required - Instant startup, in-memory storage - Contributions welcome

Feedback welcome!

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