SergioPerea
Projects

Software that moves the business

A selection of real projects, with the tech stack used and the measurable impact of each one.

Banking
BankingJavaSpring BootKafkaPostgreSQLKubernetes

Banking Core Modernization

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

-62% Response time-80% Production incidents
Clean Architecture con TypeScript
Telecommunications
TelecommunicationsNext.jsTypeScriptGraphQLRedis

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
InsuranceNode.jsTypeScriptDockerAWS Lambda

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
Trunk-Based Development
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