Senior Full-Stack Developer

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Senior Full-Stack Developer

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Senior Full-Stack Developer

Amsterdam

Full-time

Senior (9+ YOE)

Product

€80,000 - €110,000

Build features end to end, from the data model to the production UI, on a platform that processes 1.1B+ data points from ChatGPT, Claude, Perplexity, and the other major AI engines. The team is small, you get real autonomy, and code ships the same day.

This position is closed and no longer accepting applications.

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

In this role you own features from start to finish. You scope them with product and design, build the schema and the API, ship the UI, and keep an eye on them in production. You work directly with the founders, with no management layers between you and the decisions.

The stack is a TypeScript monorepo (React, Next.js, Fastify, Prisma, tRPC) on Postgres, Elasticsearch, Redis, and ClickHouse, running on Google Cloud. It's split into several services, including the API server, an AI gateway, ingest pipelines, and log processing, and each one has its own scaling problems.

What You'll Do

Take features from problem definition to production: scope with product and design, build the schema, write the API, ship the UI, and monitor it once it's live

Design and improve the data pipelines that move millions of records a day through Postgres, Elasticsearch, Redis, and ClickHouse

Build and run services on Google Cloud (Cloud Run, Pub/Sub, CI/CD) and keep them observable with Sentry, structured logging, and custom dashboards

Help shape how we work: code review standards, testing (Vitest, Playwright), and technical direction

Work directly with the founding team on what to build and how

What We're Looking For

Strong experience with TypeScript, React, and Node.js (we use Fastify, but experience with other frameworks carries over)

Comfortable 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

You write tests and take code review seriously

Nice to Have

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

Compensation

Base salary: €80,000 - €110,000

A real say in product and technical direction

A well-maintained codebase: strict TypeScript, Oxlint linting, thorough types

Time and budget for learning: conferences, courses, books

An office in central Amsterdam, with a hybrid setup where you manage your own schedule

Regular team off-sites and company sports activities

This position is closed and no longer accepting applications.

View open positions

The AI visibility platform to monitor, rank, and grow your brand in AI search. Join the team.

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Agent Chat Across the DashboardFact Checks Read the Pages AI CitesGoogle Search Console & Bing Tabs on Sitemap PagesAI Answer Widgets in the API & MCPTrack Exa's CrawlersFact Check Accuracy ScoreAI Visibility & Content Tabs on Sitemap PagesChatGPT Election Results in Responses

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1017 RP Amsterdam, The Netherlands

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401 Park Ave S, 10th Floor

New York, NY 10016, United States

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