Spherecast is building Agnes, the AI Supply Chain Manager for Consumer Goods. As a Senior Backend Engineer based in San Francisco (on-site), you’ll own the backend backbone that scales Agnes—from data architectures to real-time request processing—so goods flow reliably worldwide. This role is essential for turning complex physical logistics into programmable software that enables global brands to optimize production, movement, and delivery.

What youll do

• Own backend systems end-to-end, from data architectures to real-time request processing.
• Design scalable data architectures and backend systems to support Agnes globally.
• Turn the physical flow of goods into programmable code by collaborating with the core team.
• Build reliable, high-performance services that move goods through factories, warehouses, and channels.
• Own deployment, testing, and performance optimization in a fast-paced, autonomous environment.
• Collaborate with cross-functional teams to ship features that scale with the business.

What Spherecast is looking for

• Proven ability to own backend systems end-to-end and ship real products.
• Strong background at the intersection of large-scale data architectures, systems engineering, and organizing messy real-world data.
• Hands-on experience with modern backend stack environments: FastAPI, Python, and pytest, with a track record of shipping real products.
• Familiarity with Claude Code, Codex, and OpenCode; able to parallelize tasks to support 24/7 shipping.
• Track record building full-stack apps, including designing data architectures and backend systems.
• Proficiency in SQL with high-performance queries over large data points.
• Solid system design skills and the ability to design scalable architectures that grow with the company.
• Versatile engineering approach—knowing when to apply the right tool for the job.
• Experience building a company before.
• Experience with frontend frameworks and their testing, unstructured data ingestion systems, DevOps, and AWS.