Distributed systems & concurrency
Architecture for workloads where coordination, throughput and fault tolerance are central—not afterthoughts.
Software engineering consultancy
Software that stays composed under pressure.
We design and build scalable, resilient, high-performance systems—turning complex architecture into software your business can depend on.
What we do
End-to-end software engineering.
From the first architectural decision to production delivery, we work alongside your team to build systems that are clear, efficient and ready to evolve.
Consulting & technical direction
Pragmatic architecture, technical discovery and senior guidance that turn ambiguity into a buildable plan.
Cloud-native platforms
Observable, automated and secure services designed for modern infrastructure and predictable operations.
Custom software development
Hands-on implementation across backend, APIs and user-facing products, built with clean code and long-term ownership in mind.
Our approach
Complexity, made operational.
The best architecture is not the most elaborate. It is the one that makes the system easier to change, easier to operate and easier for your team to own.
Understand the pressure points
We begin with real constraints: traffic, latency, regulation, team shape and delivery risk.
Design the smallest strong system
Clear boundaries, explicit trade-offs and technology chosen for the job—not for fashion.
Build alongside your team
Senior engineers stay close to delivery, shorten feedback loops and transfer knowledge as the system grows.
Leave it ready to evolve
Observability, automated delivery and maintainable code turn launch day into a beginning—not a finish line.
About Reactor
Senior engineers. Direct collaboration.
Reactor Solutions is a software consultancy based in Cádiz, Spain. We help organisations solve demanding engineering problems without putting layers between the challenge and the people doing the work.
FocusScalable, resilient systems
ModelEmbedded collaboration
DeliveryArchitecture through implementation
Based inCádiz, Spain
Our team
Meet the developers.
Jacinto Reguera
Backend Developer
Jaime Cabeza de Vaca
Backend Developer
Germán Cabeza de Vaca
Frontend Developer
Reactor / Blog
Explore the blog ↗Engineering worth sharing.
Practical ideas on architecture, Java and distributed systems. Decisions, trade-offs and principles for better software.
Spring Modulith in practice: protect your application boundaries
A Java example with orders and billing: create two modules, catch an invalid dependency with a test and fix it through a public API.
Read article ↗Virtual threads: more concurrency, with clear limits
What changes when Java tasks spend time waiting on external services, and what to measure before adopting this model.
Read article ↗Retry without duplication: resilience and idempotency
A timed-out call has not necessarily failed. Design what happens when the client tries again.
Read article ↗
Have a demanding system?
Let’s build something that holds up.
Tell us what is slowing your product or platform down. We’ll start with the engineering problem and work forward from there.
hello@reactorsolutions.io