Luis A.
Backend Software Engineer @Episode Six
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WORK HISTORY
Backend Software Engineer @Episode Six
Global issuer-processor platform powering card programs for 30+ banks and fintechs across North America, Europe, and APAC.• Designed a concurrent parent-child balance check using pessimistic locking for a major prepaid card client, enabling real-time authorization against shared parent accounts with safe transaction serialization under concurrency.• Built the Google Unified Push Provisioning endpoint, implementing PGP signing (SHA-384) and AES-256 encryption with multi-version key rotation support.• Migrated a critical financial report from ETL to the core platform, optimizing million-row production MySQL queries through composite indexes and EXPLAIN-validated execution plans.• Built a daily processor balance report for a US sponsor bank integration, including CSV generation, SFTP delivery, and full-customer coverage.• Implemented cash-in limit risk rules with combined velocity controls to strengthen fraud prevention.• Improved CI execution time by ~30% through a custom JUnit 5 Extension optimizing integration test lifecycle.Tech: Java, Groovy, Hibernate/JPA, MySQL, ISO 8583, PGP (Bouncy Castle), AWS (S3, SFTP), Liquibase, Jenkins, JUnit 5, Akka
EDUCATION
University of Buenos Aires
Ingenieria Informatica, Gestión industrial de sistemas
SKILLS
ABOUT LUIS A.
Payment systems engineer with 13 years building backend systems in Java and 5+ years specializing in real-time transaction processing at Episode Six, a global issuer-processor powering card programs for banks and fintechs. What I do at E6: → Real-time payment authorization (ISO 8583, cooperative auth) → PGP cryptography for card tokenization (Google Pay, MDES) → Financial reporting at scale (million-row query optimization) → Multi-client architecture serving 30+ programs across NA, EU, and APAC Previously: Mercado Libre (WMS/Fulfillment), Despegar.com, IPSY, QuanticMind, HP. Tech: Java, Kotlin, Groovy, Spring, Hibernate/JPA, MySQL, PostgreSQL, AWS, Docker, Jenkins, Liquibase, REST APIs, distributed systems.
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