Founding Software Engineer — Full Stack

Rheaction•Los Angeles, CA

8d•Onsite

About The Position

The Founding Software Engineer will help build and scale sophisticated software products at an early-stage technology startup. This hands-on role spans full-stack engineering, backend systems, data infrastructure, and automation, with significant ownership over product architecture and technical decisions. The engineer will build from scratch, solve complex real-world problems, and ship production-quality software in a fast-moving environment. The position is based on-site in Los Angeles, California, five days per week. It is full-time and requires at least two years of experience. Compensation is $140,000–$200,000 base salary plus meaningful equity. Relocation support is available. Applicants must be U.S. citizens and meet applicable U.S. export-control eligibility requirements (ITAR).

Requirements

At least 2 years of professional software engineering experience, with a strong record of shipping production software.
Strong full-stack development experience, particularly with TypeScript.
Backend proficiency in Python or Go.
Experience designing and building applications, APIs, and backend systems end-to-end.
Strong understanding of data modeling, system architecture, and software engineering fundamentals.
Demonstrated ownership of products or substantial technical features.
Ability to work independently and solve ambiguous problems.
High agency, strong product instincts, and a bias toward execution.
Comfort working in an early-stage startup environment.
U.S. citizenship and eligibility under applicable U.S. export-control requirements (ITAR).

Responsibilities

Design, build, and ship full-stack applications and production systems.
Develop scalable backend services, APIs, and data infrastructure.
Build internal platforms and tools that streamline complex business and operational workflows.
Work with real-time data, integrations, and automation systems.
Own features and technical initiatives from concept through deployment.
Collaborate with cross-functional engineering teams to solve complex technical problems.
Make architectural decisions and improve system performance, reliability, and scalability.
Identify high-impact opportunities and independently drive solutions.