K&K; Talents

is an international recruitment agency that has been providing technical resources in the European region

since 1993.

This position is with one of our

clients in Spain

, which is actively hiring candidates to expand its team.

Title: Full Stack Engineer – Knowledge Graph & Agentic AI Location: Barcelona, Spain (2 days onsite/week) Employment Type: Contract

Role: We are looking for a

Full Stack Engineer – Knowledge Graph & Agentic AI

to join an exciting project. The role focuses on building scalable

data and AI platforms

, combining Semantic Knowledge Graphs, RAG architecture, APIs, MCP endpoints, vector databases and Agentic AI. You will work closely with data scientists, ontologists, architects, product managers and business stakeholders to deliver secure, scalable and high-quality data products for AI and analytics use cases.

Responsibilities: Build and maintain

Semantic Knowledge Graphs

using AWS Neptune. Develop

RAG and Agentic AI solutions

using Knowledge Graphs and vector databases. Build

MCP endpoints and APIs

for AI use cases. Develop data integrations and pipelines using modern cloud data technologies. Integrate solutions with

MuleSoft, SLMs and LLMs

. Optimize integration and API performance.



Work with technical and business stakeholders in an Agile environment.

Required Skills: 5–10 years of relevant experience in

Data Engineering, AI Engineering or Software Engineering

. Proven experience delivering

Semantic Knowledge Graph solutions

. Strong hands-on experience with

Knowledge Graphs - AWS Neptune, RDF, SPARQL

. Experience with

integration and API performance optimization

. Hands-on experience with

MCP endpoints/tools

. Strong experience with

MuleSoft APIs

. Experience with

SLM/LLM integration and fine-tuning

. Experience with

RAG, vector databases and Agentic AI

. Strong skills in

Python, React and SQL

. Experience with

Snowflake, dbt and Fivetran

. Good knowledge of

AWS, including AWS Bedrock

.

Preferred Skills: Experience with

Collibra and Immuta

. Experience with complex enterprise Knowledge Graph environments. Master's degree in Computer Science, Data Management or a related field. Strong stakeholder management, documentation and cross-cultural collaboration skills.

Note: Applicants for employment in Spain should possess work authorisation, which does not require sponsorship by the employer for a visa.

📌 Full Stack Engineer – Knowledge Graph & Agentic AI (Madrid)
🏢 K&K Talents
📍 Madrid