Semantic Backend Engineer (Contract, Remote)

INFUSE München

Stellenbeschreibung:

Hiring Process

We review your application against our job requirements and conduct a thorough, human‑driven assessment. If your background aligns with our needs, we may invite you to submit a short video interview. This is often followed by a test or short project that demonstrates your skills. Next, you will meet with our hiring manager and/or interview team via Zoom or in person. Finally, if you are a good fit, we will discuss an offer for you to join INFUSE.

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About INKHUB

INKHUB is ingesting 10 million raw PDFs to build the internet’s richest catalog of marketing‑grade B2B content—tagged, summarized, and searchable by topic, company, or intent.

Job Title

Applied ML Engineer

What You’ll Do

Own the ETL pipeline from raw PDFs (S3-ingested) to structured resources
Finalize our summarization and classification flow using open‑source models with GPT‑4o fallback
Apply filtering logic (≤3 years old, ≤100 pages, etc.) to enforce resource quality
Map each asset to the specific topic taxonomy (10+ per topic across ~9,000 topics)
Generate dense embeddings using sentence‑transformers
Load and query embeddings using Milvus or pgvector
Implement “freshness” logic to identify and index only new or updated content based on file diffing, crawl timestamp, or document hash
Build a QA/eval harness: format compliance, , drift monitoring
Expose /v1/semantic‑search via FastAPI, with filtering and rank fusion
Collaborate closely with our Tech Lead on UX integration and snippet generation

Your Toolbox

Python, PyTorch, sentence‑transformers, OpenAI APIs, or similar pretrained LLMs.
FastAPI, Milvus or pgvector, PyPDF/Tika, Airflow or Lambda for orchestration.
Docker, GPU scheduling, Athena/Redshift SQL.

You Might Be a Fit If...

You’ve built ML pipelines that touched real users, not just notebooks.
You’ve worked on semantic search, embeddings, or large‑scale tagging.
You’ve wrestled with unstructured data and love turning chaos into clarity.
You like working fast, iterating with feedback, and tracking metrics that matter.

Why This Role Matters

Your models decide what gets found, how it’s tagged, and which content and companies stand out. You’ll help define what “relevance” and “freshness” mean for over a million resources and 50,000+ company pages and ensure INKHUB stays ahead of the curve.