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salesHAX Consulting GmbH
salesHAX Consulting GmbH
11 – 50 Employees
B2BConsultingSales
salesHAX Consulting GmbH is a Hamburg-based B2B consulting firm focused on sales and customer acquisition for service businesses, especially agencies. Since 2018, the company has supported more than 600 service providers through personalized consulting, coaching, workshops, and community-based learning. Its work centers on developing practical sales strategies, improving business development performance, and refining operational processes to help clients build more effective and sustainable growth systems.
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Full-Stack AI Developer – Remote in Germany

Build salesHAX’s subscription-based RAG AI product as a full-stack developer. Own the RAG pipeline, web application, Stripe subscriptions, content ingestion, and analytics dashboard.

DEGermany
€60,000 – €110,000 / year
RemoteFull-timeMiddleSeniorGerman RequiredAI EngineerMachine Learning Engineer
JavaScriptNext.jsNode.jsPostgresReact

Description

  • Design and develop the server-side RAG pipeline, covering query processing, embeddings, vector search, and prompt construction.
  • Build the frontend and backend while keeping every LLM API call strictly on the server.
  • Implement a three-tier Stripe subscription model with a seven-day trial.
  • Create reliable database-backed webhook logic to validate subscription tiers.
  • Develop an automated Whisper API pipeline that transcribes new audio and video, cleans the output, splits it into chunks, and loads it into the vector database.
  • Build an internal behavioral analytics dashboard for real-time visibility into search queries, emotional tone, content gaps, and usage limits.
  • Coordinate technical decisions with the Project Lead.

Requirements

  • Extensive experience building modern full-stack web applications, preferably with Next.js and React on the frontend and Node.js with Express or Next.js API Routes on the backend.
  • Hands-on experience developing RAG systems, operating vector databases such as Pinecone or Weaviate, and integrating LLM APIs including Anthropic Claude Sonnet and OpenAI.
  • Strong PostgreSQL skills, including experience with platforms such as Supabase, plus authentication tools such as Clerk or Supabase Auth.
  • Experience implementing Stripe securely for subscriptions, dunning, and webhooks.
  • Strong security awareness, with strict server-side handling and enforcement of API keys and rate limits.
  • Ability to work independently within a focused 12-week build-to-launch schedule and proactively coordinate technical choices with the Project Lead.
  • A GitHub profile and relevant RAG or full-stack project references are welcome but optional.

Benefits

  • Work fully remotely with flexibility from anywhere.
  • Use modern LLMs and a contemporary technology stack to develop an innovative RAG AI system.
  • Take a central role in building a high-visibility product ahead of its launch.
  • Work through short communication channels with direct access to the Project Lead.
  • Continue collaborating on maintenance and future development after a successful launch.

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