Why hire me

Ruben Isaac Lopez Peña

FullStack Software EngineerJavaReactNodeIAM

Building secure, event-driven systems that scale to millions.

High-scale systemsSecurity & IAMFull SDLC ownership
Ruben Isaac Lopez Pena

Principal Engineer

Biography

I am a Principal Fullstack Engineer with Technical Lead capabilities—over 10+ years designing and delivering secure, high-scale systems end to end. I move comfortably across the stack, balancing JVM and service-oriented work in Java and Node.js with product-grade interfaces in React and TypeScript, keeping architecture, performance, and operability aligned.

In identity and access management, I have shipped OIDC-backed integrations and large-scale migrations—systems trusted at 40M+ Users scale—while favoring Clean Architecture, explicit domain boundaries, and implementations that can evolve when requirements or scale shift.

Leadership, for me, is hands-on: mentoring engineers, raising the bar on code review and design, and streamlining delivery by pairing strong engineering discipline with AI-assisted workflows (Cursor, Claude) so teams ship faster without cutting corners on quality or security.

Impact at a glance

  • 40M+ Users

    Large-scale migrations using Spring Batch.

  • 40+ Clients

    Successfully delivered IAM (OIDC/SAML) solutions.

  • 30% Performance Gain

    API optimization using Node.js / NestJS.

  • 10+ Years

    Full SDLC leadership from design to deployment.

Professional experience

Detailed roles with Technical Lead delivery, key contributions, and stack depth—expand each position for the full picture.

Trusted by Enterprise Partners

Platforms, cloud, and regulated sectors where I have delivered identity programs and full-stack systems at enterprise scale.

  • Auth0Platform
  • OktaPlatform
  • AWSPlatform
  • FintechSector
  • Digital BankingSector
Auth0
Okta
AWS
Fintech
Digital Banking
Auth0
Okta
AWS
Fintech
Digital Banking

IAM & federation depth

Representative patterns from enterprise identity work — data-backed domain model, ready to plug into a real backend.

  • OIDC

    Enterprise OIDC Federation

    Authorization Code + PKCE flows with enterprise IdP trust boundaries.

  • SAML

    SAML SSO Bridges

    SP-initiated SSO with attribute mapping and session hardening.

  • SCIM

    SCIM User Lifecycle

    Automated provisioning/deprovisioning aligned with HR and security policies.