SergioPerea
Currently 100% booked with development projects

Code that survives and evolves year after year.

20+ years modernizing critical systems for banking, telecom, and insurance. No downtime, no surprises, with results measured in business terms.

Ilustración de un desarrollador programando de noche, con temática espacial

The stack I build and modernize with

TypeScriptTypeScript
ReactReact
Next.jsNext.js
Node.jsNode.js
JavaJava
Spring BootSpring Boot
PostgreSQLPostgreSQL
DockerDocker
KubernetesKubernetes
TypeScriptTypeScript
ReactReact
Next.jsNext.js
Node.jsNode.js
JavaJava
Spring BootSpring Boot
PostgreSQLPostgreSQL
DockerDocker
KubernetesKubernetes

How I can help

Three concrete ways to work together, adapted to where your product or team is right now.

Featured projects

Real modernization cases with business-impact metrics.

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Banking
Banking

Banking Core Modernization

Migrated a COBOL account-management monolith to Java/Spring microservices without interrupting 24/7 service.

-62% Response time-80% Production incidents
Telecommunications
Telecommunications

Telco Self-Service Portal

Redesigned and rebuilt the customer portal: from an 8s-load system to an SPA with instant perceived load time.

-40% Load time+27% Self-service conversion
Insurance
Insurance

Insurance Pricing Engine

Real-time premium calculation system that replaced a 6-hour overnight batch process with millisecond responses.

6h → 200ms Calculation timex5 Quotes/day
EurekaDev
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EurekaDev

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Free resource

The CTO's Technology Modernization Checklist

The same document I use as a starting point in my audits. Get it free in your inbox.

  • 12 points I review in every technical audit
  • How to prioritize technical debt by business impact
  • A security checklist before migrating to the cloud

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Shall we talk about your project?

30 minutes, no strings attached, to understand your situation and see if I can help modernize your system.

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