Backend/Platform Engineer
RadixArk•Palo Alto, CA
•Hybrid
About The Position
RadixArk is looking for a Backend/Platform Engineer to build the API layer, control plane, and platform services that power SGLang and Miles in production. You'll design and implement the REST/gRPC APIs, authentication systems, multi-tenancy isolation, and monitoring infrastructure that thousands of developers and companies rely on. This role bridges high-performance inference/training systems with production-grade platform engineering.
Requirements
- 4+ years experience building production backend systems, APIs, or platform infrastructure
- Bachelor's or Master's degree in Computer Science, Engineering, or equivalent industry experience
- Strong proficiency in Python, Go, or Rust with production-quality code standards
- Experience designing and building REST/gRPC APIs at scale
- Solid understanding of distributed systems, databases, caching, and message queues
- Experience with authentication, authorization, rate limiting, and multi-tenancy
- Familiarity with cloud platforms (AWS, GCP, Azure) and Kubernetes
- Experience with monitoring and observability tools (Prometheus, Grafana, DataDog)
Nice To Haves
- Understanding of ML serving infrastructure or high-throughput systems is a plus
Responsibilities
- Design and build production APIs for SGLang and Miles: REST/gRPC endpoints, client SDKs, API versioning
- Implement authentication, authorization, and rate limiting systems for multi-tenant deployments
- Build control plane infrastructure: job scheduling, resource allocation, model deployment management
- Create monitoring, logging, and observability systems for production inference and training workloads
- Design and implement billing integration, usage tracking, and quota management
- Build management dashboards and admin tools for cluster operations
- Ensure API reliability, performance, and security at scale
- Implement multi-tenancy isolation and security boundaries
- Create deployment automation, CI/CD pipelines, and rollback procedures
- Write comprehensive API documentation and integration guides
- Partner with Systems Engineers to optimize end-to-end latency from API → serving layer
- Debug production issues and implement reliability improvements
Benefits
- competitive compensation with equity
- comprehensive health benefits
- flexible work arrangements
Stand Out From the Crowd
Upload your resume and get instant feedback on how well it matches this job.
Upload and Match Resume
What This Job Offers
Job Type
Full-time
Career Level
Senior
