Principal AI Engineer – API Modernization (AI & Agent Systems)
Core
Architecting and modernizing core APIs and platform interfaces to enable reliable, scalable interactions between AI agents/orchestration systems and ABC Fitness's business ecosystem.
Role type
Principal AI Engineer (API Modernization & Platform Architecture)
Builds
AI-ready API standards, resilient distributed workflows, and modernized legacy platform interfaces for automated machine consumption.
Domain
Fitness SaaS / AI Infrastructure / Distributed Systems
Deliverable
production ML models | infrastructure
Required skills
Backend systems architecture, distributed systems design, API contract design, schema consistency, observability, versioning, authentication/authorization, legacy system modernization, technical strategy, mentoring senior engineers.
Preferred skills
gRPC, Protocol Buffers, GraphQL, Model Context Protocol (MCP), AI orchestration systems, event-driven architectures, workflow orchestration, platform governance.
Technologies
gRPC, Protocol Buffers, GraphQL, MCP, AI orchestration frameworks
Responsibilities
Lead modernization of core APIs for AI-native workflows; Define company-wide standards for AI-ready APIs; Refactor legacy systems for structured machine consumption; Design backend systems for high-concurrency automated traffic; Establish architectural guardrails for resiliency and rate control; Partner with AI orchestration and platform teams; Provide technical leadership and mentorship across engineering organizations.
Seniority
Principal, hands-on IC with strategic leadership
