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

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

Company: ListKit (US-based, remote-friendly) Compensation:  (based on experience) Type: Full-time contractor, remote Location: Ukraine / EU

About Us

ListKit is a fast-growing B2B lead generation platform processing 825M+ data records. We're an AI-first engineering team — Claude and Cursor are embedded in everything from code review to sprint planning. If you've never shipped code with AI tools, this isn't the right fit. If AI-assisted development is already how you work, keep reading.

What You'll Do

• Design and build backend services in Node.js and TypeScript powering data enrichment, order processing, and API infrastructure
• Own async processing pipelines: message queues, job lifecycle management, retry logic, completion detection
• Work with cloud services (GCP Cloud Run, PubSub, Cloud Tasks, Firestore) to build scalable, event-driven systems
• Optimize SQL queries against large-scale databases (SingleStore, SQL Server, PostgreSQL) with 100M+ row tables
• Integrate third-party APIs with rate limiting, provider fallback patterns, and error recovery
• Build and maintain REST APIs serving both internal frontend teams and external customers
• Use AI development tools (Claude Code, Cursor, GitHub Copilot) as your primary workflow — not as an afterthought
• Participate in code reviews, architectural discussions, and sprint planning

Requirements

• 4+ years of backend development experience with Node.js and TypeScript
• Strong understanding of async patterns: Promises, event loops, streaming, worker threads
• Experience with message queues and async job processing (PubSub, SQS, Kafka, or similar)
• Solid SQL skills — complex JOINs, query optimization, stored procedures
• Experience with cloud platforms (GCP preferred; AWS/Azure transferable)
• Familiarity with containerized deployments (Docker, Cloud Run, or similar)
• Active user of AI coding tools (Claude, Cursor, Copilot) in daily development
• Strong written English for async communication (Slack, Linear, docs)

Nice-to-Have

• Experience with GCP specifically (Cloud Run, PubSub, Cloud Tasks, Firestore)
• Familiarity with Terraform or other IaC tools
• Experience with data enrichment, lead generation, or sales automation platforms
• Stripe billing integration (credits, refunds, usage-based pricing)
• Exposure to .NET/C# (reading code, understanding integration points)
• Experience building multi-tenant SaaS APIs with API key auth and per-plan rate limiting
• React/Next.js frontend skills (we have a frontend team, but versatility is valued)

Why ListKit

• AI-first team: we estimate all work assuming AI-assisted development and track AI adoption scores
• Small, high-output engineering team where your work directly impacts revenue
• Real distributed systems problems at meaningful scale (not CRUD)
• US-based company with EU-friendly hours and async-first culture
• Fast-moving — we ship weekly, not quarterly