Contributed to a major infrastructure deprecation by migrating a subscription upsell system to a modern content framework.
Software Development Engineer · Madrid, Spain
Santiago
Cereijo Botana
Software Engineer with expertise in developing and maintaining large-scale platforms at Amazon, plus hands-on experience building and configuring AI-powered tools and agentic workflows.
Currently at
01 / IMPACT
Results recruiters can measure.
Real outcomes from production systems—not demo metrics.
Downstream services unblocked after extending a shared UI library for right-to-left languages.
Visual regression failures reduced while resolving 40 rendering issues across reusable components.
175 paid Prime Business subscriptions on the first day of the Australia marketplace launch.
02 / SELECTED WORK
Engineering across borders.
High-stakes launches where product, platform, and regulation meet.
01
Made content operations self-service.
Migrated a business subscription upsell experience from a legacy renderer to a modern content framework. The new system supports ~18 configurable variations and lets non-engineers schedule updates without code changes.
OUTCOME$2M+ deprecation
02
Turned RTL support into a platform capability.
Updated buttons, tables, dropdowns, and cards in a shared UI library to support right-to-left languages—resolving 40 rendering issues and creating a reliable path for teams launching in new regions.
OUTCOME~120 services unblocked
03
Untangled compliance across five services.
Traced authorization and invoice generation failures through five interdependent backend services, enabling customers with multiple legal entities to generate compliant e-invoices under fast-moving regulatory constraints.
OUTCOMEMarketplace launch unblocked
03 / ABOUT
Systems thinker.
Systems thinker.
Pragmatic builder.
I’m a software engineer who enjoys the hard middle: understanding the business constraint, finding the fault line across services, and shipping a solution teams can operate long after launch.
My background spans backend services, cloud architecture, developer tooling, and frontend platforms. I work comfortably in English across international, multidisciplinary teams.
01Own the outcome
02Design for reuse
03Make operations boring
04 / TOOLBOX
Built for production.
LANGUAGESJava · TypeScript · JavaScript
CLOUD & BACKENDAWS · Spring · Microservices · APIs
ENGINEERINGArchitecture · IaC · Monitoring · Testing
GLOBAL PRODUCTSi18n · RTL · Compliance · Launches
05 / EDUCATION
Strong foundations,
Strong foundations,
international perspective.
European Master in Software Engineering
Universidad Politécnica de Madrid · Delivered in English
Bachelor’s in Computer Engineering
Universidad de Salamanca · Thesis with Honours · Erasmus in Slovenia
06 / LET'S BUILD
Have a difficult
Have a difficult
problem worth solving?
I’m interested in ambitious engineering teams working on products with real scale and meaningful constraints.
yagocereijobotana@gmail.com