Senior MaaS Backend Engineer

You will co-own MaaS architecture, build compatible inference APIs and routing, optimize model-serving performance, and scale global reliability. You will implement security, identity, metering, billing, migrations, observability, and data-retention controls while mentoring engineers and leading technical execution.

Responsibilities

• Co-own MaaS system design and technical execution
• Own inference gateway compatibility and API versioning
• Build load-aware routing, circuit breaking, and fallback mechanisms
• Optimize token throughput, caching, latency, and autoscaling
• Scale regional inference pools and active-active control planes
• Define and defend service-level objectives
• Enforce authorization, multi-tenant isolation, API-key management, and rate limits
• Build exactly-once token metering and usage ledgers
• Execute incremental migrations using shadow traffic and dual writes
• Deliver request tracing, cost telemetry, and log-retention controls

Requirements

• 8+ years of backend engineering experience
• 3+ years owning a high-traffic multi-tenant API platform for paying customers
• Experience with multi-region active-active distributed systems, caching, backpressure, and performance engineering
• Experience executing zero-downtime migrations for stateful systems
• Proficiency with Go, Kubernetes, Envoy, and GPU-aware scheduling
• Knowledge of PostgreSQL, Redis, Kafka, OpenTelemetry, and high-cardinality analytics stores
• Understanding of LLM serving, server-sent-event streaming, KV caching, and throughput trade-offs
• Experience with exactly-once metering and billing systems
• Experience designing fail-closed authorization and cross-tenant isolation
• On-call and incident-review experience