Full-Stack AI Developer – Engineer

salesHAX Consulting GmbH

. Architect and develop the server-side RAG pipeline, from query processing, embedding, and vector search through to prompt construction.

Posted 9/21/2026full-timeRemote • GermanyMid-LevelSenior💰 €60,000 - €110,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in architecting and developing full-stack web applications, with a focus on server-side RAG pipeline integration and robust database management. Proficient in implementing secure payment solutions and developing analytics dashboards for real-time monitoring.

Highest-signal resume keywords

Full-Stack Web DevelopmentRAG System DevelopmentPostgreSQL Database ManagementStripe IntegrationLLM API Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Next.jsNode.jsExpressPostgreSQLRAG SystemsVector DatabasesStripeWebhook LogicWhisper APIBehavioral Analytics

Soft Skills

Independent WorkProactive Alignment

Tools & Technologies

SupabaseClerkGitHub

Industry Keywords

Subscription ModelAPI SecurityRate LimitingContent TranscriptionEmotional Tone Analysis

Tech Stack

Tools & technologies

JavaScriptNext.jsNode.jsPostgresReact

About the role

Key responsibilities & impact

Architect and develop the server-side RAG pipeline, from query processing, embedding, and vector search through to prompt construction.
Build the frontend and backend while ensuring that all LLM API calls remain strictly server-side.
Integrate a three-tier subscription model, including a 7-day trial, via Stripe.
Implement robust webhook logic for tier validation directly in the database.
Build an automated pipeline that transcribes new audio and video content via the Whisper API, cleans it, splits it into chunks, and loads it into the vector database.
Develop an internal behavioral analytics dashboard for real-time monitoring of search queries, emotional tone, content gaps, and limit usage.
Align technical decisions with the Project Lead.

Requirements

What you’ll need

Extensive experience developing modern full-stack web applications, ideally using our preferred tech stack: Next.js (React) for the frontend and Node.js (Express or Next.js API Routes) for the backend.
Practical experience building RAG systems, managing vector databases (Pinecone or Weaviate), and working with LLM APIs, particularly Anthropic Claude Sonnet and OpenAI.
Strong proficiency with PostgreSQL (e.g., via Supabase) and authentication solutions such as Clerk or Supabase Auth.
Experience securely implementing Stripe, including subscriptions, dunning, and webhooks.
Strong security awareness: API keys and rate limits must be processed and enforced strictly on the server side.
Ability to work independently within a tight 12-week build-to-launch schedule and proactively align technical decisions with the Project Lead.
GitHub profile and relevant RAG or full-stack references are optional.

Benefits

Comp & perks

100% remote: Work flexibly from anywhere.
Cutting-edge technology: Work on a genuinely innovative RAG AI system using modern LLMs and a modern tech stack.
Responsibility and impact: Play a key role in building a product that will have high visibility after launch.
Efficiency: Short communication channels with direct access to the Project Lead.
Long-term prospects: Opportunity for ongoing collaboration on maintenance and further development after a successful launch.