Senior Software Engineer - Python - Knowledge Graphs Pharma

ERNI; Barcelona; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Certifications covered up to €1,500

Private health insurance

Sick leave coverage

Emotional, legal, and family support

Gym discounts

Flexible remuneration

Referral bonuses

23 vacation days

Language courses

Job summary

ERNI Barcelona is seeking a senior backend software engineer to design, develop, and maintain a Python-based MCP backend that connects Knowledge Graphs with AI agents and cloud data platforms. You will optimize SPARQL queries and API performance, extend semantic model compilation capabilities, and ensure security, scalability, and reliable testing in a cloud-native setup.

The role offers a hybrid work model in Barcelona with a focus on autonomous contribution, mentoring, and knowledge sharing

Qualifications

• 5+ years of professional software engineering experience.
• Backend services and APIs in production environments.
• Strong hands-on Python 3, FastAPI and REST APIs.
• Experience with RDF and SPARQL and cloud-native environments.

Responsibilities

• Design, develop and maintain a Python-based MCP backend connecting Knowledge Graphs with AI agents and cloud data platforms.
• Optimize SPARQL queries and API performance.
• Extend semantic model compilation capabilities and ensure security, scalability, and automated testing.

Skills

Python 3

FastAPI

Pydantic

REST APIs

RDF

SPARQL

Docker/Podman

Kubernetes/OpenShift

CI/CD

Git

OAuth 2.0/OIDC

RBAC

Caching

Observability

Linux

Terraform

Jenkins

English

Tools

Docker/Podman

Kubernetes/OpenShift

Jenkins

Terraform

Git

Job description

About The Position

Can you imagine building the semantic backbone that connects enterprise knowledge with AI agents? Join our expert team to work on an innovative project in the pharmaceutical sector, contributing to the development of a platform that connects Enterprise Knowledge Graphs, AI agents and cloud data platforms to enable trusted, natural-language access to complex business information. You will apply your expertise in Python, FastAPI, RDF and SPARQL to build scalable backend services, optimize semantic queries and support AI-driven solutions in a cloud-native environment. At ERNI, you are never just a number. Even if you work on an external project, you will feel part of the team and always supported. With people. Besides your team and manager, you will have several support figures like a godparent, who will help you with the practical and administrative aspects of daily life during your first 6 months. And the second most important person after you, your mentor, who will guide you through your entire onboarding and career at ERNI. You will have regular 1:1 meetings with them, and recurrently, you will work on your development plan to define your short-, medium-, and long-term goals. At ERNI, we highly value experience and technical knowledge. As a senior profile, you will have the space to continue growing, whether by deepening your technical skills or having greater influence on project decisions, with autonomy and the opportunity to share knowledge with other experts. And if you are interested in mentoring, there is also space for that: supporting other ERNIans while still focusing on the technical excellence that sets us apart.

What You Will Bring

• At least 5 years of professional software engineering experience, designing, developing and maintaining backend services and APIs in production environments.


• Strong hands‑on experience with Python 3, FastAPI, Pydantic, REST APIs.


• Practical experience with RDF and SPARQL, including graph data modeling, complex graph traversals and query optimization.


• Experience with Docker/Podman, Kubernetes or OpenShift, CI/CD pipelines, Git and cloud-nativ e environments.


• Experience implementing API security, authentication and performance optimization, including OAuth 2.0/OIDC, RBAC, caching and observability.


• Experience with Linux, Terraform and CI/CD tools such as Jenkins.


• Fluent written and spoken English, strong ownership and clear communication in international Agile/Scrum teams.

You will be responsible for designing, developing and maintaining a Python-based MCP backend that connects Knowledge Graphs with AI agents and cloud data platforms, optimizing SPARQL queries and API performance, extending semantic model compilation capabilities, and ensuring security, scalability, automated testing and operational reliability across cloud-native environments.

What if the project ends?

We work on a wide variety of projects, technologies, and sectors, allowing you to keep growing in different environments. If a project ends or you feel ready for a new challenge, we will find another one that aligns with your professional development.

Our working model

We ask you to be available for key meetings. Need to leave for a doctor’s appointment or to pick up your child from school? No problem. We trust you to deliver quality work within your 40‑hour workweek. Our model is hybrid: we usually go to the office 2 days a week, though this depends on the project and team, but we love seeing each other’s faces; the best stories always happen in the office!

You will also enjoy:

• We cover your certifications and reward technical achievements up to €1,500.


• Private health insurance.


• Full coverage for sick leave.


• Free emotional, legal, and family support.


• Gym discounts or sports compensation.


• Flexible remuneration: meals, transport, childcare, etc.


• Referral bonuses: up to €6,000 per candidate and €5,000 per client.


• 23 working days of vacation.


• Free language courses: English, Spanish, Catalan and German.

And the salary?

We will discuss it during the first call. If it is important to you, feel free to ask!