Software Engineer – AWS

Posted 10hrs ago

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Software Engineer expanding LocalStack’s AWS emulator and closing parity gaps. Building reliable local cloud sandboxes for developers and AI agents.

Expand and harden LocalStack’s AWS emulator
Take ownership of individual AWS services and make them behave as closely as possible to real AWS
Independently move AWS services from moto-backed to fully first-party implementations
Own persistence store design, full API operation coverage, and conformance to LocalStack conventions
Close parity gaps using snapshot tests against real AWS
Act as first responder for owned services and triage customer-reported parity bugs
Turn around parity bugs within a 5-day median, including issues surfaced through Terraform and CDK
Contribute reusable testing infrastructure such as conformance harnesses, snapshot tooling, and fixtures
Independently scope and sequence an internalization from API-documentation analysis through shipped provider by month 12
Use modern AI coding and agentic tools while maintaining software quality and reliability

3+ years of professional software engineering experience
Strong engineering fundamentals
Experience working from a written specification against a system you cannot see inside, such as public APIs, protocols, wire formats, parsers, compilers, SDKs, emulators, or reverse-engineering projects
Strong testing mindset
Hands-on experience with AI coding and agentic development tools, used substantially to build and ship real software
Fast learning and strong problem-solving skills
Open-source contribution experience, particularly sustained involvement in an existing project (strong plus)
Experience working with AWS at application or platform level (strong plus)
Experience with distributed systems, storage, or protocol conformance (strong plus)
Deep AWS expertise (nice to have)
Experience with Infrastructure as Code, such as Terraform, CDK, or Pulumi (nice to have)
Experience with Kubernetes and microservices architecture (nice to have)
Short motivation outlining why you are the perfect candidate

Fully remote
Competitive salary
Annual company retreat
2 extra company-wide holidays
Friendly and inclusive workplace culture (community guilds and online company events)
Yearly bonus