Backend Engineer API
SpaceXAI builds frontier AI models and products including the Grok conversational assistant and a multimodal developer API.
Funding history
About SpaceXAI
SpaceXAI is a US-based AI company focused on accelerating scientific discovery and understanding the universe through reasoning, voice, image, video, and generative AI systems. Formerly xAI, it was acquired by SpaceX effective February 2, 2026, while continuing to operate the x.ai site and services.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
You will build the API that serves models to developers worldwide. You will own the end-to-end high-throughput inference system, including model-serving infrastructure, request routing, SDK development, rate limiting, observability, and efficient scaling.
Requirements
- Expert knowledge of Rust or C++
- Experience designing, implementing, and maintaining reliable horizontally scalable distributed systems
- Knowledge of service observability and reliability practices
- Experience operating PostgreSQL, ClickHouse, and MongoDB
Responsibilities
- Build the API serving models to developers
- Own high-throughput, low-latency inference systems
- Develop model-serving infrastructure and request routing
- Develop SDKs and rate limiting
- Maintain observability, availability, and efficient scaling
Benefits
- Equity
- Healthcare coverage
- Dental coverage
- Cash plan
- Income protection
- Life insurance
- Discounts and perks