Senior Full-Stack Engineer

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🕒 March 18

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Hairball

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2021

🤝 B2B

🛍️ eCommerce

B2B • eCommerce

Hairball is a technology consulting and systems-integration firm that helps companies automate, integrate, and transform business processes using the NetSuite and Celigo platforms. It specializes in eCommerce, CRM, supply chain and 3PL integrations, EDI, order management, and payment reconciliation, offering implementations, managed services, analytics, and continued success support. Hairball works with platforms like Shopify, BigCommerce, Magento, Amazon, Salesforce, HubSpot, and various WMS/3PL systems to accelerate time-to-value for merchants and mid-market businesses.

📋 Description

• We need a senior full-stack engineer to build the multi-tenant platform foundation for a new SaaS product over a 6-month contract engagement. • You will be the primary architect and builder of the core infrastructure. • A junior JavaScript developer on the team will work alongside you, learning the stack and eventually owning day-to-day development after your engagement ends. • The architecture decisions you make in the first 8 weeks will shape this product for years. • Months 1-2: Platform Spine. • Months 3-4: Billing & Integrations. • Months 5-6: Hardening & Handoff.

🎯 Requirements

• Multi-tenant SaaS architecture: You have personally built (not just contributed to) a multi-tenant application with tenant data isolation. • PostgreSQL Row-Level Security: You have implemented RLS policies in production. • Next.js 14+ App Router: You are current with App Router (not Pages Router). • TypeScript: You write TypeScript fluently, not JavaScript with type annotations bolted on. • Stripe Billing integration: You have wired up subscriptions, handled webhooks with signature verification, and implemented metered/usage-based billing. • Multi-org authentication: You have implemented multi-organization auth (Clerk, Auth0, or similar) in a SaaS product. • Strongly Preferred Experience with Drizzle ORM (or Prisma with willingness to learn Drizzle). • AI/LLM application development — calling LLM APIs, streaming responses, token tracking. • Vercel deployment and optimization. • Experience mentoring junior developers. • Prior work in e-commerce, fintech, or financial data platforms.

🏖️ Benefits

• Complete architecture spec: A detailed specification covering every subsystem you will build. You are implementing a well-defined plan, not designing from scratch. • Deep domain expertise: The product owner has deep expertise in the target market. You will never be guessing about business requirements. • Working prototype: The backend pipeline and database schema already exist. You are building on a foundation, not from zero. • AI development tooling: Claude Code is available as a pair programmer. • Autonomy: You make the technical decisions within architectural boundaries. No micromanagement. • Weekly video check-in, daily async on Slack.