<p>Job Title: Senior Backend Engineer (.NET / AI Systems)r</p><p>Position Type: Full-Time, Remote</p><p>Working Hours: U.S. Business Hours</p><p></p><p>About the Role</p><p>We are hiring a Senior Backend Engineer (.NET / AI Systems) to own the entire technical function of an early-stage SaaS platform. This is a hands-on leadership role where you will write production code daily while making architecture, infrastructure, and AI system decisions for a platform operating at scale.</p><p>You will be accountable for backend architecture, system reliability, AI pipelines, and guiding a small development team in a fast-moving startup environment.</p><p></p><p>Responsibilities</p><p>Backend Architecture & Engineering</p><ul><li> Design, build, and maintain a .NET 8.0 / C# backend using Clean Architecture and DDD principles </li><li> Own the architecture and codebase across 14+ independently deployed microservices </li><li> Deliver new features, refactor existing systems, and resolve performance bottlenecks </li></ul><p>AI Systems & LLM Orchestration</p><ul><li> Design and operate production-grade AI pipelines across multiple LLM providers </li><li> Optimize prompts and workflows for batch processing, personalization, and segmentation at scale </li><li> Manage rate limits, failover strategies, and cost optimization across AI providers </li></ul><p>Databases & Data Infrastructure</p><ul><li> Manage MySQL, Redis, and MongoDB in production environments </li><li> Oversee bulk writes, caching strategies, event streams, and analytics pipelines </li><li> Ensure data consistency and performance across distributed services </li></ul><p>Infrastructure, Reliability & Monitoring</p><ul><li> Own Linux-based infrastructure, CI/CD pipelines, and service deployments </li><li> Implement centralized logging, monitoring, alerting, and uptime tracking </li><li> Proactively identify and mitigate reliability and scalability risks </li></ul><p>API Integrations & System Resilien