Senior Backend Engineer

Job Title: Senior Backend Engineer (.NET / AI Systems)r Position Type: Full-Time, Remote Working Hours: U.S. Business Hours About the Role 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. You will be accountable for backend architecture, system reliability, AI pipelines, and guiding a small development team in a fast-moving startup environment. Responsibilities Backend Architecture & 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 & 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 & 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 & 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 & 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 & 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 & 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 & Onboarding Please mention the word **FAMED** and tag RMjAwMTpmZDg6ZjQwMjpiYjBiOjIzNTY6ZDI2ZTo2Zjg3OmNhYTA= when applying to show you read the job post completely (#RMjAwMTpmZDg6ZjQwMjpiYjBiOjIzNTY6ZDI2ZTo2Zjg3OmNhYTA=). 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.