Senior Full-Stack Engineer

Promptwatch helps businesses understand how they appear in AI-generated answers. We track citations, sentiment, and visibility across every major AI engine, processing billions of crawler logs and AI responses in real time. Thousands of companies use what we build to make decisions every day.

Our stack: TypeScript monorepo (React, Next.js, Fastify, Prisma, tRPC), backed by Postgres, Elasticsearch, Redis, and ClickHouse, running on Google Cloud. Multiple services — API server, AI gateway, ingest pipelines, log processing — each with its own scaling challenges.

• Take a feature from problem definition to production: scope it with product and design, build the schema, write the API, ship the UI, and monitor it in prod
• Design and improve data pipelines that move millions of records through Postgres, Elasticsearch, Redis, and ClickHouse daily
• Build and operate microservices on Google Cloud (Cloud Run, Pub/Sub, CI/CD) — including keeping them observable with Sentry, structured logging, and custom dashboards
• Contribute to how we work: code review standards, testing practices (Vitest, Playwright), and technical direction
• Pair with the founding team directly — no layers of management between you and decisions.
  

• Strong experience with TypeScript, React, and Node.js (we use Fastify, but framework-specific knowledge transfers)
• Comfort designing and querying relational databases (we use Postgres with Prisma)
• Experience building APIs — whether tRPC, REST, GraphQL, or a mix
• Familiarity with job queues, async processing, or event-driven architectures
• A habit of writing tests and reviewing code thoughtfully
  

• Elasticsearch, ClickHouse, or other analytical datastores
• Working with LLM APIs (OpenAI, Anthropic, Google)
• Data visualization (Recharts, D3, or similar)
• Monorepo tooling (Turborepo, pnpm workspaces)
• Google Cloud Platform
  

Base salary: €80,000 - 110,000

Direct influence on product and technical direction — this isn't a feature factory

A codebase that's genuinely well-maintained (TypeScript strict, Biome linting, comprehensive types)

Budget and time for learning — conferences, courses, books, whatever makes you better

Office in central Amsterdam with a hybrid setup that trusts you to manage your schedule

Regular team off-sites and company sports activities