AI Engineer: Applied NLP & Knowledge Graphs

Happeo; Helsinki; On-site; EUR 60,000 - 80,000; Full time

Benefits offered by this job

Competitive salary and equity plan

Flexible office setup

Full 5-weeks holiday policy

Comprehensive benefits including healthcare

Top-tier work equipment

Strong karaoke culture

Job summary

Happeo, a Series B startup in Helsinki, seeks a knowledgeable contributor to build the Compass knowledge verification layer. You will develop a knowledge graph with autonomy, ensuring accuracy and trust in organizational knowledge while utilizing tools like Neo4j and Python.

Join a hybrid working environment, where you’ll enjoy competitive benefits, a 5-week holiday policy, and the chance to shape how teams communicate. A dynamic workspace awaits!

Qualifications

• Proven experience in NLP and applying LLMs to real-world problems.
• Expertise in handling knowledge graphs and graph databases.
• Experience in backend development with Node.js or Python.

Responsibilities

• Build knowledge graph and detection capabilities from scratch.
• Create pipelines for extracting structured knowledge from unstructured text.
• Lead the impact delivery from initial stages to production.

Skills

Information extraction from unstructured text

Claim extraction and fact-checking

Entity resolution and deduplication

Applying NLP and LLMs

Building for multilingual content

Tools

Neo4j

Node.js

Python

Docker

Kubernetes

Job description

About Happeo

Happeo is a Series B startup revolutionizing how organizations collaborate and communicate through our unified social intranet platform. We combine collaboration tools, knowledge sharing, and internal communications into one seamless solution that helps teams connect and stay aligned. We pride ourselves on our dynamic, collaborative culture that emphasizes delivering high-quality solutions while fostering professional development. No bureaucracy, just smart people building things that matter.

About the Role

You’ll be working with our development team to build Happeo’s proprietary technology for intranet information management. The platform helps organizations find gaps, duplication, and outdated content, and keep the knowledge their teams rely on accurate and trustworthy. We’re launching into Open Beta, and the next frontier is knowledge that people, and the AI systems they use, can actually trust.

This role builds toward Compass, Happeo’s new knowledge verification layer. As AI systems like Claude, Gemini, and ChatGPT increasingly answer from an organization’s own knowledge, Compass checks whether that knowledge actually holds up, surfacing where it’s duplicated, stale, or self‑contradictory, and proposing fixes. The job isn’t search, it’s detection: you’ll build the knowledge graph and graph‑RAG that understand what the knowledge says and whether it’s correct, not just which documents mention what.

Our Stack

React/React Native frontends, Python, Node.js, Java backends, running on GCP (App Engine, Cloud Run, Kubernetes, Cloud SQL, Firestore, VertexAI).

What You’ll Do

You’ll stand up the knowledge graph and graph‑RAG behind Compass from scratch; this doesn’t exist here yet, and building it is the job. It’s novel work: extracting and structuring an organization’s knowledge so issues in it can be detected. You’ll ship from zero to production with minimal oversight and real autonomy to define the technical approach, make the architectural calls, and drive direction. This isn’t a detailed‑specs role: you’ll form opinions about what to build, how, and why it matters, bring in knowledge the team doesn’t have yet, and actively spread it.

Your Typical Day

• Build information extraction pipelines that turn messy documents into structured facts: entities and the relationships between them.
• Build claim extraction and entity resolution: pull atomic, verifiable claims from documents, and decide when two extracted things are the same entity.
• Detect where knowledge is duplicated, stale, or self‑contradictory, and prove it works without crying wolf.
• Stand up the knowledge graph the detection runs on, and the graph‑RAG layer that supports it alongside conventional RAG.
• Own the impact end to end: ship, measure, iterate, fail fast, learn faster.
• Evangelize what you bring in: level up the wider AI team so the knowledge sticks past you.

What We’re Looking For

The core of this role is applied NLP: turning messy, unstructured knowledge into verifiable structure. That’s where most of the work, and most of the difficulty, lives.

• Information extraction from unstructured text: entity and relationship extraction, plus ontology and taxonomy development, turning messy documents into structured facts.
• Claim extraction and fact‑checking: pulling atomic, verifiable claims out of documents (e.g. “SLA = 72h”) and reasoning about whether they conflict (natural-language inference), are stale, or are unverified.
• Entity resolution and deduplication: deciding two extracted things are the same entity and canonicalizing them; spotting when two documents are versions of each other.

• Strong, practical experience applying NLP and LLMs to real problems.
• Knowledge graphs and graph databases, required as the foundation the detection runs on: Neo4j or similar, fluent in Cypher, and you’ve built a graph‑RAG system.
• Backend experience (Node.js or Python preferred) and cloud, ideally GCP.
• Comfortable building for multilingual content: our users and their knowledge aren’t all in English.
• A doer, not an academic: the work needs real research, but you ship and prove fast and make calls with incomplete information, rather than going deep and slow.
• Upbeat, high‑energy, extreme ownership: you own the impact, not just the task.

Nice‑to‑have

• Docker/Kubernetes.
• Java backend experience.
• Data engineering and ETL pipelines.
• DevOps/CICD experience (MLOps/LLMOps).

What Success Looks Like in 90 Days

• A knowledge graph stood up and live in production: the foundation Compass runs its detection on, not a prototype.
• Working detection: Compass can flag where knowledge is duplicated, stale, or self‑contradictory, with claims and entities resolved well enough to trust.Measured on precision and recall, not ranking: you’re confident you’re surfacing real issues, and just as confident you’re not raising false ones.
• The wider AI team has learned something from how you built it: you’ve brought knowledge in and spread it.

Location

This role is based in Helsinki, Finland. The working mode is Hybrid. If needed, we’ll support you with relocation and Visa application.

Perks and Benefits

• A competitive salary and equity plan.
• Flexible office setup with remote and hybrid working possibilities.
• Full 5‑weeks holiday policy from day one.
• Comprehensive benefits, including healthcare, lunch, and phone subscription.
• Top‑tier work equipment you need to succeed.
• A strong karaoke culture at practically every company event!

Happeo is committed to unbiased recruitment, ensuring that all prospective employees, regardless of background, gender, race, age, or any other characteristic, are given equal consideration. We value different perspectives and encourage people of all identities, experiences, and abilities to apply. If you’re passionate about the role and meet the qualifications, we’d love to hear from you; your unique background and experiences are welcome here.

If you like us but this job isn’t quite right for you, please submit an open application through our website. You may be the perfect candidate for our next opening!