Job Title: Senior Backend Engineer (.NET / AI Systems)rPosition Type: Full-Time, RemoteWorking Hours: U.S. Business HoursAbout the RoleWe 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.You will be accountable for backend architecture, system reliability, AI pipelines, and guiding a small development team in a fast-moving startup environment.ResponsibilitiesBackend Architecture &amp; Engineering Design, build, and maintain a .NET 8.0 / C# backend using Clean Architecture and DDD principles  Own the architecture and codebase across 14+ independently deployed microservices  Deliver new features, refactor existing systems, and resolve performance bottlenecks AI Systems &amp; LLM Orchestration Design and operate production-grade AI pipelines across multiple LLM providers  Optimize prompts and workflows for batch processing, personalization, and segmentation at scale  Manage rate limits, failover strategies, and cost optimization across AI providers Databases &amp; Data Infrastructure Manage MySQL, Redis, and MongoDB in production environments  Oversee bulk writes, caching strategies, event streams, and analytics pipelines  Ensure data consistency and performance across distributed services Infrastructure, Reliability &amp; Monitoring Own Linux-based infrastructure, CI/CD pipelines, and service deployments  Implement centralized logging, monitoring, alerting, and uptime tracking  Proactively identify and mitigate reliability and scalability risks API Integrations &amp; System Resilience Manage 25+ third-party API integrations used in production  Design retry, fallback, and graceful degradation strategies  Ensure system stability when external providers fail or degrade Team Leadership &amp; Engineering Standards Lead and mentor a small engineering team through code reviews and architectural guidance  Set and enforce engineering standards, workflows, and best practices  Collaborate closely with the founder on product direction and technical strategy What Makes You a Perfect Fit You are a senior, hands-on engineer who enjoys owning systems end-to-end  You are comfortable being the most experienced technical person on the team  You balance fast execution with long-term architectural thinking  You take ownership of reliability, performance, and technical outcomes  You thrive in early-stage startup environments Required Experience &amp; Skills Deep expertise in .NET 8.0, C#, ASP.NET Core, and Entity Framework Core  Experience with distributed systems and independently deployed services  Strong production experience with MySQL, Redis, and MongoDB  Hands-on DevOps experience with Linux servers and CI/CD pipelines  Experience managing large numbers of third-party API integrations  Proven experience building and operating AI/LLM systems at scale  Familiarity with AI-assisted development tools and workflows  Strong understanding of monitoring, observability, and incident prevention  Experience leading small engineering teams  Strong English communication skills What Does a Typical Day Look Like ? Write and review production backend code  Make architectural decisions across services, databases, and AI pipelines  Monitor system health and resolve reliability issues  Guide developers through code reviews and technical feedback  Collaborate with the founder on product and system evolution In short: You own the technical foundation of the platform and ensure it scales reliably while enabling rapid product development.Key Metrics for Success (KPIs) System uptime and service reliability  Backend and AI system performance improvements  AI cost efficiency and pipeline stability  Code quality and deployment reliability  Team execution and delivery quality Interview Process Initial Screening Call  Technical Interview with Pavago Recruiter  Client Interview  Offer &amp; OnboardingPlease mention the word **FAMED** and tag RMjYwMDo4ODAxOjFiMDI6ZWQwMDo4NWRmOjEwM2Y6MzU3ZToyMjVm when applying to show you read the job post completely (#RMjYwMDo4ODAxOjFiMDI6ZWQwMDo4NWRmOjEwM2Y6MzU3ZToyMjVm). This is a beta feature to avoid spam applicants. Companies can search these words to find applicants that read this and see they're human.