About the Role RadixArk is looking for a Member of Technical Staff — Backend/API Platform Engineer to build the API layer, control plane, and platform services that power SGLang and Miles in production. You'll design and…
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Full-time
bachelor degree, postgraduate degree
Equity, Health Benefits, Flexible Work Arrangements
Posted 11d ago
~40 hrs/week
Responsibilities
Design and implement production-grade APIs, control plane infrastructure, and monitoring systems for SGLang and Miles. Ensure API reliability, security, and performance while managing multi-tenant isolation and deployment automation.
Requirements
Requires 4+ years of experience building production backend systems and proficiency in Python, Go, or Rust. Candidates should have a strong background in distributed systems, cloud platforms, and API design at scale.
Full job description
About the Role
RadixArk is looking for a Member of Technical Staff — Backend/API 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)
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
About RadixArk
RadixArk is an infrastructure-first company built by engineers who've shipped production AI systems, created SGLang (30K+ GitHub stars, the fastest open LLM serving engine), and developed Miles (our large-scale RL framework). Founded by AI infrastructure veterans from xAI and NVIDIA, we're on a mission to democratize frontier-level AI infrastructure by building world-class open systems for inference and training. Our team has optimized kernels serving billions of tokens daily, designed distributed training systems coordinating 10,000+ GPUs, and contributed to infrastructure that powers leading AI companies and research labs.
Compensation
We offer competitive compensation with equity, comprehensive health benefits, and flexible work arrangements. Compensation is determined by location, level, and experience.
Equal Opportunity
RadixArk is an Equal Opportunity Employer and is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and more.
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