Software Engineer – AWS

About this role

Build and maintain LocalStack’s AWS emulator, reproducing real AWS service behavior from documentation and observed behavior. You’ll own services end-to-end, from investigation and implementation through conformance testing and customer-reported bug fixes, using AI coding tools as part of your workflow.

About the company

LocalStack is a local cloud emulator that lets developers and AI agents build and test AWS cloud applications on their machines.

The team

AWS Emulator team

Stack

What you'll do

• Take AWS services from third-party-backed implementations to first-party implementations, including persistence, API coverage, and LocalStack conventions.
• Improve AWS parity by expanding snapshot-test coverage against real AWS and reducing reported defects.
• Own services after release and triage and resolve customer-reported parity bugs.
• Build reusable conformance testing infrastructure, snapshot tooling, and fixtures.
• Independently plan and deliver a complete emulated service implementation.

What we're looking for

• Mid-level or senior professional software engineering experience and strong fundamentals.
• Strong programming skills in at least one language; Python is preferred.
• Experience reproducing system behavior from documentation, APIs, specifications, or observation.
• Strong testing mindset; uses tests to understand and design systems.
• Substantial hands-on experience with AI coding and agentic development tools, including validating their output.
• Experience building, deploying, and operating applications on a cloud provider; AWS preferred.
• Fast learning, problem-solving ability, and a product mindset.

Nice to have

• Open-source contributions, especially sustained involvement in an existing project.
• Experience with distributed systems, storage, or protocol conformance.
• Deep AWS expertise.
• Infrastructure as Code experience, such as Terraform, CDK, or Pulumi.
• Kubernetes, microservices, or developer tooling experience.

Benefits

• Fully remote work.
• Annual company retreat.
• Two additional company-wide holidays.
• Yearly bonus.