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 tur
📌 Senior Backend Engineer (Madrid)
🏢 Kleo
📍 Madrid