Founding Engineer: AI Infrastructure & Apps

Hypertype; Stockholms kommun; On-site; SEK 900,000 - 1,200,000; Full time

Job summary

Hypertype is seeking a Founding Engineer in Stockholm to join a lean team building AI infrastructure and applications for industrial companies. You’ll own major technical decisions and drive products from idea to production and deployment with the founders and customers.

You’ll work across frontend, backend, AI, and data, crafting scalable systems, web apps with React/Next.js, and Python/FastAPI services, while shaping the company’s technical direction and product KPIs.

Qualifications

• Strong full-stack engineering experience with backend focus.
• 2-3+ years of Python experience, with async programming, CPU-bound vs I/O-bound workloads, multiprocessing, multithreading, GIL, asyncio, and production API development.
• Strong experience with FastAPI or similar Python backend frameworks.
• Production experience with TypeScript, React, and Next.js.
• Experience designing, deploying, and operating cloud-native applications on Azure, GCP, or equivalent infrastructure.
• Practical experience building end-to-end LLM/RAG applications, including: LLMs and embedding models, Vector databases, Document ingestion, parsing, and chunking, Retrieval and reranking, Vector RAG/SQL-RAG/GraphRAG, Prompt and context management, Evaluation and monitoring, Latency and cost optimization.
• Experience building agentic AI workflows, including tool use, orchestration, state management, and multi-step execution.
• Experience with complex data extraction and ingestion pipelines across text, tabular data, and images.
• Experience using AI coding tools extensively while still reviewing, validating, and taking full ownership of production code.

Responsibilities

• Build, ship, and maintain production systems across frontend, backend, AI, data, and cloud infrastructure.
• Develop web applications using React, Next.js, and TypeScript.
• Design backend services and APIs using Python and FastAPI.
• Build and improve end-to-end AI products, including RAG, AI agents, retrieval, evaluation, and data ingestion pipelines.
• Build data extraction pipelines capable of handling complex industrial documents containing text, tables, images, manuals, and other unstructured data.
• Work with Vector RAG, SQL-RAG, GraphRAG, embeddings, retrieval/reranking, prompt construction, and context management.
• Help operate our current GCP infrastructure and contribute to the migration of relevant infrastructure to Microsoft Azure.
• Prototype rapidly, test with customers, iterate based on real usage, and turn successful prototypes into scalable production systems.
• Work directly with customers to troubleshoot technical issues and ensure successful deployments.
• Define and track product and technical KPIs together with the founders and business team.
• Monitor production systems and continuously improve reliability, latency, AI quality, and infrastructure costs.
• Evaluate new AI models, frameworks, and infrastructure and make pragmatic build-vs-buy decisions.

Skills

Full-stack engineering

Python

Asyncio

FastAPI

TypeScript

React/Next.js

Azure/GCP

LLM/RAG

Vector databases

Data ingestion

Production software

Tools

Azure

GCP

Firebase

BigQuery

Job description

Hypertype is seeking a Founding Engineer in Stockholm to join a lean team building AI infrastructure and applications for industrial companies. You’ll own major technical decisions and drive products from idea to production and deployment with the founders and customers.

You’ll work across frontend, backend, AI, and data, crafting scalable systems, web apps with React/Next.js, and Python/FastAPI services, while shaping the company’s technical direction and product KPIs.