Independent Software Engineering
Backend systems.
Built to last.
Rat Labs builds robust backend infrastructure — distributed services, cloud systems, APIs, and developer tooling. Senior engineering quality, indie team agility.
What we build
Backend Systems
High-performance APIs, event-driven services, and real-time systems. Designed for reliability and built to scale without drama.
Cloud Infrastructure
Kubernetes, AWS, and GCP. Infrastructure that scales predictably and doesn't wake you up at 3am. Observability built in from the start.
Developer Tooling
CLIs, SDKs, internal platforms, and automation pipelines. Tools that engineers actually want to use — fast, composable, well-documented.
About
Indie engineering.
Senior quality.
Rat Labs is the engineering practice of Jason Fitzpatrick — a senior/staff software engineer based in Castellón de la Plana, Spain. Over 15 years building production systems across fintech, SaaS, and developer platforms.
The work is technical leadership and hands-on engineering: architecture, backend development, distributed systems, and the kind of cloud infrastructure that teams rely on. Available for contracts, projects, and select full-time roles.
See Jason's full profile →
Have a project in mind?
Reach out — happy to talk through what you're building.