Backend Engineer (Node.js / TypeScript)

Backend Engineer (Node.js / TypeScript) — AI-First SaaS | ListKit

ListKit is a B2B lead generation platform processing 825M+ records, helping businesses find and reach their ideal customers. We're hiring a Backend Engineer to own critical services powering our data enrichment pipeline, order processing, and API infrastructure.

This is a backend-heavy role. We have a strong frontend team — we need someone who lives in Node.js, thinks in async patterns, and knows their way around cloud infrastructure and large-scale databases.

What makes us different:

We're an AI-first engineering team. Claude Code isn’t an optional extra — it’s how we build. We track AI adoption, estimate all work assuming AI-assisted development, and expect engineers to ship faster because of it. If that excites you, read on.

What You'll Do:

• Design and build backend services in Node.js/TypeScript for data enrichment, order processing, and API infrastructure
• Own async processing pipelines, including message queues, job lifecycle management, retries, and completion detection
• Work with GCP (Cloud Run, Pub/Sub, Cloud Tasks, Firestore) to build event-driven, scalable systems
• Optimize SQL queries across 100M+ row tables (SingleStore, SQL Server, PostgreSQL)
• Integrate third-party APIs with rate limiting, provider fallback, and robust error recovery
• Build REST APIs for internal teams and external customers
• Use AI development tools (Claude Code, Cursor, Copilot) as a core part of your workflow

Requirements:

• 4+ years of backend experience with Node.js/TypeScript in production
• Strong understanding of async patterns (Promises, event loop, streaming)
• Experience with message queues (Pub/Sub, SQS, Kafka, or similar)
• Solid SQL skills, including complex JOINs, query optimization, and stored procedures
• Experience with a cloud platform (GCP preferred; AWS/Azure transferable)
• Active use of AI coding tools (Claude, Cursor, Copilot)
• Strong written English for async-first communication

Nice to Have:

• Experience with GCP services (Cloud Run, Pub/Sub, Cloud Tasks, Firestore)
• Terraform or other Infrastructure-as-Code (IaC) experience
• Background in data enrichment, lead generation, or sales automation platforms
• Experience with Stripe billing integration
• Ability to read or work with .NET/C# codebases
• Experience designing multi-tenant SaaS APIs