The Opportunity Mercury is QuoIntelligence's Threat
Intelligence platform: it processes over 2 billion signals, tracks
400+ threat actors, and delivers finished intelligence to security
teams across financial services, energy, and government in Europe.
You will join a four-person engineering team, working directly with
the engineering lead on Mercury and Agent Karla , an AI-powered
threat analyst that runs on the Mercury engine. You will ship new
features and pay down tech debt in the same week. The team treats
clean, maintainable code as a prerequisite, not a nice-to-have. If
you want to build a product where what you ship reaches real users
quickly, where you will shape how the engineering team works as it
grows, and where the domain is genuinely interesting, keep reading.
What You'll Do Design, build, and ship backend services in Python:
REST APIs, web services, data processing. This is roughly 60% of
your time. The APIs serve both internal teams and external clients,
so performance and reliability matter. Build and maintain basic
frontend features in React and TypeScript.



You will work across the
full stack, not just behind the API layer. Write and maintain tests
at every level: unit, integration, end-to-end (Playwright or
similar). Testing is a first-class concern, not an afterthought.
Own CI/CD pipelines, code quality tooling, and static analysis. You
will have direct influence over how the team ships code. Work with
data: SQL queries, data modeling, domain modeling, and
visualization. Mercury processes threat intelligence data;
understanding how to query and present it well is part of the job.
Collaborate across teams. The top priority for this hire is someone
who asks for help when stuck, proactively helps others, and
communicates clearly with non-engineering stakeholders. AI-First in
Engineering We want AI to be part of QuoIntelligence’s engineering
operating model. We expect engineers to use AI tools like Cursor by
default across design, coding, debugging,

📌 Senior Software Engineer (Madrid)
🏢 Quointelligence
📍 Madrid