Full Stack Engineer

ReFibuy • Raleigh, NC

2d • Onsite

About The Position

ReFiBuy is seeking a Full Stack Engineer to help build an AI-native, agentic ecommerce platform end-to-end. This role involves shipping features across a Next.js + TypeScript front end and a C# .NET 9 back end on .NET Aspire, powering an event-driven, multi-tenant SaaS platform. The engineer will be responsible for both production agent workflows (enrichment, scoring, multi-engine monitoring) and UI development, owning features from schema to UI to telemetry to rollout. The platform currently processes tens of thousands of SKUs through agentic enrichment and distributes optimized catalogs to engines like ChatGPT, Perplexity, Gemini, and Copilot, tracking visibility from each.

The role requires a builder who is comfortable working across the full stack, including frontend (Next.js, React, TypeScript, Tailwind + shadcn, SSR/ISR, server components, Chrome extension), backend (C# .NET 9 on .NET Aspire, microservices, minimal APIs, DI, background workers, feature-flagged rollouts), data (PostgreSQL, Redis, Neo4j, vector stores), eventing (Event-driven Dapr architecture), AI-native technologies (AutoGen, Semantic Kernel, LLMs, retrieval, function/tool calling, prompt/response evals, agent orchestration), integrations (Shopify, Bloomreach, PowerReviews, etc.), cloud platforms (Azure, AWS, Supabase, Fly.io), and developer experience tools (GitHub monorepo, Actions, trunk-based dev, Linear). Observability includes OpenTelemetry and internal AI-powered ops agents.

Requirements

• 3+ years shipping production apps with modern TypeScript/React or C#/.NET.
• Solid grasp of SSR, state management, API design, and relational data modeling.
• Hands-on experience with at least one LLM API and an agent or RAG pattern, including tool calling.
• Comfort with containers, cloud deploys, Git, code review hygiene, and automated testing fundamentals.
• Permanent work authorization in the US.

Nice To Haves

• Next.js App Router, React Server Components, Tailwind + shadcn.
• .NET 9 + .NET Aspire, minimal APIs, background jobs, Clean Architecture, CQRS.
• Event-driven messaging with Dapr or Kafka / NATS / SNS+SQS.
• Production agent work: AutoGen, Semantic Kernel, LangChain, or similar frameworks.
• Experience with evals, guardrails, and cost/latency tuning for AI agents.
• Vector DBs, RAG, hybrid retrieval, response evaluation.
• Ecommerce catalogs, marketplaces (Amazon / Walmart / eBay), feeds, attribute taxonomy, retailer integrations.
• Linear cycle-based planning, feature-flag-driven release engineering, on-call comfort.

Responsibilities

• Build product experiences in Next.js + TypeScript with polished UX.
• Design resilient .NET Aspire services and event-driven workflows, focusing on idempotency, retries, and DLQs.
• Ship and own production LLM agent processes, including catalog enrichment, attribute generation, QA automation, and the Visibility + Quality Digital Shelf scoring loop.
• Scale agentic processes from a few products to tens of thousands.
• Build the multi-engine monitoring layer to measure presence and quality across various AI engines.
• Wire up agentic ops, extending existing agents for feed health, PR reviews, backlog audits, and production monitoring, and developing new ones.
• Work on Reinforcement Learning with AI Feedback Loops.
• Own features end-to-end: schema/design, API contracts, evals + tests, telemetry, feature-flag rollout, and learnings.
• Contribute to platform and developer experience, including CI/CD, preview environments, AI coding tools, and internal libraries.

Benefits

• Healthcare (Three BCBS plans, ReFiBuy covers 80% of base plan)
• Dental Insurance
• Vision Insurance
• Life Insurance
• 401k through Human Interest with company match (100% up to 1%, 50% up to 5%, no vesting)
• Incentive Stock Options (ISOs) with 4-year vesting, quarterly
• 15 days (120 hours) of PTO per year, accruing each pay period, with carryover and payout for unused PTO
• Covered parking
• Office amenities including a spacious breakroom, hangout areas, and a wellness room

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed