Software Engineer, Developer Experience (AI Infrastructure)

Sift Stack, Inc.•Marina del Rey, CA

1d•$180,000 - $230,000•Hybrid

About The Position

Sift is hiring a Senior Software Engineer to build and own developer infrastructure and testing environments that help engineers ship software faster and with greater confidence. The role involves designing systems that let engineers create complete, production-like environments on demand to test changes, simulate realistic workloads, and validate correctness. As AI coding agents become more integrated into development workflows, this engineer will build infrastructure that lets agents independently test, debug, and validate generated code. The position is a foundational, high-ownership opportunity to architect and scale the infrastructure used to develop, test, and ship Sift’s software. Sift is a data infrastructure platform for hardware engineering teams. It turns high-frequency telemetry into engineering insights for mission-critical machines, including rockets, satellites, autonomous vehicles, energy systems, and defense platforms. The company was founded by former SpaceX engineers. Sift is headquartered in Marina Del Rey, California, and collaborates in person twice a week on Mondays and Thursdays, with a full-week gathering every two months. Candidates may relocate to Los Angeles or work from the San Francisco office. U.S. person eligibility is required: candidates must be U.S. citizens, lawful permanent residents, or protected individuals such as asylees or refugees, in compliance with ITAR/EAR regulations. The salary range is $180,000–$230,000 per year, plus equity and benefits.

Requirements

At least 6 years of professional software engineering experience, with significant experience in developer infrastructure, test infrastructure, platform engineering, or developer tooling.
Hands-on experience with Docker, Kubernetes, build systems, and deploying applications to a cloud platform such as AWS, GCP, or Azure.
Experience building and automating developer infrastructure, deployment systems, or testing environments, with an understanding of scalability, performance, and reliability.
Experience developing or optimizing CI/CD pipelines and automating infrastructure provisioning and deployments.
Strong software engineering and programming skills; Go or Python preferred.
Ability to balance infrastructure performance, environment fidelity, reliability, and cost.
Strong collaboration skills and a developer-focused mindset, with experience building tools that improve engineering productivity.
Must be a U.S. citizen, lawful permanent resident, or protected individual such as an asylee or refugee, in compliance with ITAR/EAR regulations.

Nice To Haves

Experience building ephemeral or on-demand development and testing environments.
Experience with load testing, performance testing, or distributed test execution.
Experience with browser automation and end-to-end testing tools such as Playwright or Cypress.
Experience building sandboxed execution environments or infrastructure supporting AI coding agents.
Experience working on developer infrastructure at a fast-scaling technology company, cloud platform, or compute provider.

Responsibilities

Design and build infrastructure that provisions isolated, production-like testing environments on demand, enabling engineers to validate changes against Sift’s full application stack.
Build and optimize CI/CD pipelines, build systems, and deployment automation to make testing environments fast, reliable, and cost-efficient.
Develop infrastructure for integration testing, correctness validation, load testing, and performance testing.
Build tools for realistic data generation and user behavior simulation to validate software under production-like conditions.
Enable AI coding agents to interact with testing environments, execute tests, and autonomously validate code changes.
Partner with engineering teams to understand developer needs, remove bottlenecks, and improve development velocity and software quality.