JOIN KLEO AND BUILD THE FINANCING INFRASTRUCTURE FOR EUROPE'S COMPANIES
Kleo (www.kleohub.com) is an AI-native platform that helps compaies find, match, manage, and monitor their entire financing stack: public grants, bank lending and private capital, through automated, end-to-end workflows. We replace a process that has traditionally depended on slow, manual, relationship-driven intermediaries with software.
Proactive funding
We're growing fast and we're looking for a talented Senior Backend Engineer to join the engineering team and help us scale across Europe.
What you'll do
Play a key role in building and optimizing Kleo's platform using NestJS, TypeScript, PostgreSQL, REST APIs, AWS and more.
Integrate AI and LLM solutions to automate financing workflows and push platform performance further.
Work across both coding and DevOps, contributing to the full product lifecycle from code to deployment.
Collaborate closely with the team on third-party integrations, infrastructure optimization and the ongoing development of our automated systems.
What we're looking for
Seniority:
a senior engineer who owns development end to end, from design decisions to production, and is comfortable being accountable for what ships.
Strong track record in web software development, with the judgment to make sound architectural calls and the willingness to keep learning in a fast-paced startup. As one of the first engineers, you'll have a direct impact on how the company grows.
Deep command of event-driven architectures, Domain-Driven Design (DDD), hexagonal architecture and core design patterns (repository pattern and beyond), with a clear sense of when to apply them and when not to.
Advanced PostgreSQL: query optimization, indexing strategy, execution-plan analysis and modelling for data-intensive workloads is a core part of the role, not a nice-to-have.
Solid experience integrating AI/LLM solutions into real products, ideally in production, and an interest in turning them into relia
📌 Senior Backend Engineer (Madrid)
🏢 Kleo
📍 Madrid