Backend Software Engineer – Core AI

Goodweek

Software Engineer shaping core AI backend systems at Goodweek, focusing on scalable and secure integration of AI. Collaborating in a hybrid environment with teams in Spain and US.

Posted 5/24/2026full-timeMadrid • 🇪🇸 SpainMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

CloudJavaScriptNode.jsPythonReactTypeScript

About the role

Key responsibilities & impact

Shape our core AI framework and backend, taking full ownership of backend features.
Build scalable, secure and high-performance systems integrating with AI while collaborating closely with product, data and engineering teams.
Build robust backend services for AI systems (RAG, model orchestration, vector databases).
Design scalable APIs integrating LLMs and AI workflows.
Ensure security, observability, and performance across our infrastructure.
Automate deployment pipelines, monitoring, and testing.
Participate in architecture and tech stack decisions.
Document and share technical knowledge.
Drive continuous improvement of our AI platform with innovative solutions.

Requirements

What you’ll need

Technical background
5+ years of experience with Node.js + TypeScript stack (NestJS/React)
Hands-on experience (or strong familiarity) with AI/ML integration (LLMs, RAG, or similar)
Solid understanding of backend architecture, scalability, and security best practices
Experience with databases, authentication, and cloud platforms
Familiar with CI/CD, Git workflows, and agile methodologies
Bonus: familiarity with other backend programming languages (go, python, ...)
Strong technical communication
Agile mindset focused on product and business value
Ability to document architectural decisions
Balance between code quality and delivery speed
Technical English required.

Benefits

Comp & perks

Health insurance provided by the employer
Flexible working hours
Hybrid remote work
Daily use of English through close collaboration with teams in the US and France
Our office is situated in a lively innovation hub, offering access to local meetups, events, and a strong professional community.

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Hard Skills & Tools

Node.jsTypeScriptNestJSReactAI integrationML integrationbackend architecturedatabasescloud platformsCI/CD

Soft Skills

technical communicationagile mindsetdocumentationcode qualitydelivery speed