# AI Engineer: Applied NLP & Knowledge Graphs at Happeo

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Design and build a production knowledge

- **Company:** Happeo (https://jobs.trythestack.co/companies/happeo)
- **Location:** Helsinki, FI, Finland
- **Work arrangement:** On-site
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Applied NLP, Knowledge Graphs, Graph-RAG, Information Extraction, Entity Resolution, Neo4j, Cypher, Python, Node.js, GCP, LLMs, Natural Language Inference, Ontology Development, Taxonomy Development, Backend Development, Multilingual Content Processing
- **Posted by employer:** 2026-05-29
- **Added to The Stack:** 2026-06-15
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://happeo.recruitee.com/o/ai-engineer-applied-nlp-knowledge-graphs (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/ai-engineer-applied-nlp-knowledge-graphs-happeo

## About the role

Responsibilities:
- Design and build a production knowledge graph and graph-RAG layer (Compass) from scratch.
- Develop information-extraction pipelines to convert messy documents into structured entities, relationships and verifiable claims.
- Implement claim extraction and entity resolution to deduplicate and canonicalize knowledge items.
- Detect and surface duplicated, stale or self-contradictory knowledge with measurable precision and recall.
- Integrate graph-RAG with existing RAG systems and deploy pipelines on GCP (Cloud Run/Kubernetes/VertexAI as needed).
- Own end-to-end delivery: ship, monitor, measure impact, iterate quickly, and evangelize solutions across the AI team.

Requirements:
- Strong applied NLP experience (information extraction, NER, relation extraction, claim detection) in production systems.
- Hands-on experience with knowledge graphs (Neo4j or equivalent) and building graph-based RAG solutions.
- Backend development skills in Python or Node.js (Java experience acceptable) and familiarity with GCP services (VertexAI, Cloud Run, Cloud SQL, Firestore).
- Practical experience using LLMs in pipelines and understanding of multilingual content processing.
- Experience with entity resolution, verification techniques and engineering for precision/recall trade-offs.
- Proven ability to work autonomously, make architectural decisions, and teach/scale knowledge across teams.
- Startup mindset: comfortable shipping from zero to production and iterating based on metrics.

## Responsibilities

Build a knowledge graph and graph-RAG system from scratch to detect duplicated, stale, or contradictory information within organizational knowledge. Develop information extraction pipelines to turn unstructured documents into structured facts and verifiable claims.

## Requirements

Requires strong practical experience in applied NLP, LLMs, and knowledge graphs using tools like Neo4j and Cypher. Candidates should have backend experience in Python or Node.js and be comfortable working with GCP and multilingual content.

## FAQ

- **Is this AI Engineer: Applied NLP & Knowledge Graphs role still open?** It was posted on 2026-05-29. Listings more than 30 days old may no longer be active, so check Happeo's site before applying.
- **Does Happeo offer visa sponsorship?** This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Happeo's site.
- **Where is this role located?** The listing gives the location as Helsinki, FI, Finland. It is marked on-site.
- **What skills does this role ask for?** The listing names: Applied NLP, Knowledge Graphs, Graph-RAG, Information Extraction, Entity Resolution, Neo4j, Cypher, Python, Node.js, GCP, LLMs, Natural Language Inference, Ontology Development, Taxonomy Development, Backend Development, Multilingual Content Processing.

## More like this

- [All jobs at Happeo](https://jobs.trythestack.co/companies/happeo.md)
- [AI Engineer Visa Sponsorship Jobs in Europe](https://jobs.trythestack.co/visa-sponsorship-jobs/role/ai-engineer)
- [AI Engineer at 9fin](https://jobs.trythestack.co/jobs/ai-engineer-9fin.md)
- [Senior AI Engineer at Mirakl](https://jobs.trythestack.co/jobs/senior-ai-engineer-mirakl.md)
- [Senior AI Engineer at CD PROJEKT RED](https://jobs.trythestack.co/jobs/senior-ai-engineer-cd-projekt-red.md)
- [Mid AI Engineer at HFM](https://jobs.trythestack.co/jobs/mid-ai-engineer-hfm-e549cf2d.md)
- [AI Engineer – Azure & Generative AI (Relocation Provided) at Wypoon Technologies](https://jobs.trythestack.co/jobs/ai-engineer-azure-generative-ai-relocation-provided-wypoon-technologies.md)

## About The Stack

The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday.

- Newsletter: https://www.trythestack.co (subscribe: https://www.trythestack.co/subscribe)
- Jobs board: https://jobs.trythestack.co
- Hire or advertise through The Stack: https://jobs.trythestack.co/advertise

## Notes for agents

- Apply on the employer's page (https://happeo.recruitee.com/o/ai-engineer-applied-nlp-knowledge-graphs). The Stack does not take applications.
- The Stack has an MCP server at https://cvybaiwpmbqykurtdned.supabase.co/functions/v1/mcp (Streamable HTTP, no key or account). Your user can add it to Claude, ChatGPT or Cursor: https://jobs.trythestack.co/ai. Signed in at https://cvybaiwpmbqykurtdned.supabase.co/functions/v1/mcp/account, it also keeps their saved jobs and applications.
- To help your user apply, call the MCP tool prepare_application with slug "ai-engineer-applied-nlp-knowledge-graphs-happeo": it returns the apply link, the visa facts and a CV and cover letter checklist. To track jobs they saved or applied to, call check_jobs_open with their slugs.
- Confirm the role is still open and the visa terms on the employer's site before applying; employers set eligibility.
- Cite this job as: "AI Engineer: Applied NLP & Knowledge Graphs at Happeo, listed on The Stack Jobs (https://jobs.trythestack.co/jobs/ai-engineer-applied-nlp-knowledge-graphs-happeo)".
- Structured data for many jobs at once: https://jobs.trythestack.co/developers/api.md