Full Stack Engineer

ReFibuy, Inc. • 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. The platform is event-driven and multi-tenant SaaS. Responsibilities include wiring up production agent workflows (enrichment, scoring, multi-engine monitoring) and building UI. The ideal candidate is a builder who owns the entire feature lifecycle, from schema to UI to telemetry to rollout. The company is currently processing tens of thousands of SKUs through agentic enrichment and distributing optimized catalogs to engines like ChatGPT, Perplexity, Gemini, and Copilot, tracking visibility from each.

Our stack includes:
Frontend: Next.js, React, TypeScript, Tailwind + shadcn, SSR/ISR, server components, and a 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 with pub/sub.
AI-native: AutoGen, Semantic Kernel, frontier LLMs (OpenAI / Anthropic / Google), retrieval, function/tool calling, prompt + response evals, agent orchestration in production.
Integrations: Shopify, Bloomreach, PowerReviews, Google UCP, OpenAI Catalog Feed, marketplace + retailer feeds.
Cloud + Platform: Azure, AWS, Supabase, Fly.io, Docker.
DevEx: GitHub monorepo, GitHub Actions, trunk-based dev with feature flags, Linear for cycles + tickets.
Observability: OpenTelemetry tracing/metrics/logs, dashboards, and internal Claude-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 wiring up 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 with AutoGen, Semantic Kernel, LangChain, or similar frameworks, with bonus for evals, guardrails, and cost/latency tuning.
• Vector DBs, RAG, hybrid retrieval, response evaluation.
• Experience with ecommerce catalogs, marketplaces (Amazon / Walmart / eBay), feeds, attribute taxonomy, and retailer integrations.
• Linear cycle-based planning, feature-flag-driven release engineering, and 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.
• 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, including schema/design, API contracts, evaluations + 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 with ReFiBuy covering 80% of the base plan.
• Dental, Vision, and 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 per pay period, carrying over up to a 120-hour cap, with unused PTO paid out at end of service.
• 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