Founding Engineer - AI Infrastructure & Developer Tools

Lightsage; San Francisco (CA); On-site; USD 150,000 - 230,000; Full time

Job summary

Lightsage is seeking a Founding Engineer in San Francisco to design, build, and scale core infrastructure powering agent-led growth for developer tools and platforms. You will shape the technical architecture, implement new features, and create benchmarks and analytics to measure how agents interact with APIs, CLIs, and MCPs.

You will write production-grade code, build data pipelines and dashboards, integrate with third-party tools, and experiment with AI coding systems while collaborating

Qualifications

• Able to take a loosely defined customer or product problem and drive it to a working shipped solution.
• Prior founder or early-stage startup operator experience is a plus.
• Strong written communication and ability to explain technical decisions clearly.
• Experience working with Next.js, FastAPI, Supabase, Microsoft Azure.

Responsibilities

• Design, build, and scale core infrastructure and products powering agent-led growth.
• Define technical architecture and implement new features.
• Create benchmarks and analytics measuring agent interactions with APIs, CLIs, and MCPs.
• Write production-grade code and build data pipelines and dashboards.
• Collaborate with customers to translate needs into end-to-end solutions.

Skills

Problem solving

Founding/startup experience

Communication

Technical leadership

Tools

Next.js

FastAPI

Supabase

Azure

Job description

Lightsage is seeking a Founding Engineer in San Francisco to design, build, and scale core infrastructure powering agent-led growth for developer tools and platforms. You will shape the technical architecture, implement new features, and create benchmarks and analytics to measure how agents interact with APIs, CLIs, and MCPs.

You will write production-grade code, build data pipelines and dashboards, integrate with third-party tools, and experiment with AI coding systems while collaborating