Engine & Performance Optimization Expert
Mexico City, Mexico | English & Spanish
- CV: Curriculum Vitae - Web & PDF Download
- Mail:
kibsaim.mejia@protonmail.com - (52) 56-1052-1776
- (52) 56-1738-7155
Senior Full-Stack Software Engineer, Software Architect, and DevOps Engineer with 20+ years of hands-on experience in software development and 10+ years delivering enterprise web applications and digital platforms. Experienced in designing, developing, and optimizing high-scale systems across the full software development lifecycle, from frontend architecture and backend services to cloud infrastructure, CI/CD, automated testing, and production operations.
Specialized in JavaScript/TypeScript, Node.js, Java, Spring Boot, React, Vue, Angular, REST APIs, GraphQL, microservices, cloud architecture, DevOps, and web performance engineering. Strong experience delivering solutions for global financial institutions including HSBC, BBVA, and Citibanamex.
Experienced working with global-scale banking ecosystems serving millions of users, zero-downtime operational requirements, production triage, cloud services, API integration, data architecture, application security, and continuous delivery.
Performance-focused engineer with hands-on expertise in V8 memory analysis, memory leak detection, browser rendering, Web Performance Optimization, WebAssembly, automated browser testing, and CI/CD quality automation.
Mentor-oriented technical leader who combines architecture, hands-on engineering, business logic, and cross-functional collaboration to deliver scalable, secure, reliable, and maintainable systems.
Everything is programmable.
- Languages: JavaScript, TypeScript, Java, Python, HTML5, CSS, SQL
- Frontend: React, Vue.js, Angular, Svelte, Web Components, Progressive Web Apps, Browser Rendering, V8, Web Performance
- Backend: Node.js, Spring Boot, REST APIs, GraphQL, Microservices, API Integration
- Databases: PostgreSQL, MongoDB, MySQL, Redis
- Cloud & DevOps: Google Cloud Platform, AWS, Microsoft Azure, Docker, Kubernetes, Terraform, Ansible, Jenkins, GitLab CI/CD, Infrastructure as Code
- Testing & Automation: TDD, Automated Testing, End-to-End Testing, Regression Testing, Puppeteer, Playwright, Visual Regression, CI/CD Quality Gates
- Performance: V8 Heap Snapshots, Memory Leak Detection, Memory Management, Lazy Loading, CDN Strategy, Critical Rendering Path, Lighthouse, WebAssembly
- Architecture & Security: Software Architecture, System Design, Data Modeling, Business Logic, Authentication, Authorization, Permission Systems, Application Security, Production Triage, Zero-Downtime Operations
Senior Software Engineer — Global Applications & Production Triage
2024 – 2025
- Supported applications and services operating at global banking scale, within an ecosystem serving millions of users worldwide.
- Participated in global production triage, investigating incidents across frontend, backend, APIs, cloud infrastructure, and distributed services.
- Collaborated with global engineering teams to diagnose incidents, coordinate remediation, and deploy production changes under zero-downtime operational requirements.
- Implemented frontend, backend integration, API, UX, data visualization, and business logic changes across multiple enterprise applications using Vue.js and React.
- Worked with Google Cloud Platform (GCP) and participated in architecture and cloud-cost decisions involving scalability, infrastructure, and operational requirements.
- Collaborated directly with business and technical stakeholders to translate business requirements into production-ready solutions.
- Contributed to continuous development workflows where changes were investigated, implemented, validated, and deployed within hours or minutes depending on scope.
Key Achievements:
- Supported a global banking technology ecosystem serving millions of users, participating in production triage and engineering workflows with zero-downtime requirements.
- Contributed to consolidating two separate applications into a unified solution, automating an end-to-end service workflow and increasing reported operational productivity by approximately 150%.
- Delivered frontend/backend integrations and UX improvements across globally distributed enterprise applications.
- Participated in global incident triage across multiple services, APIs, technology stacks, and cloud dependencies.
- Contributed to architecture and cloud-cost decisions balancing development effort, infrastructure requirements, scalability, and business value.
Senior Frontend Architect — Full-Stack Architect — Technical Lead
2020 – 2022
Client: BBVA
- Architected and developed a global internal enterprise application from the ground up supporting complex banking business logic and operational workflows.
- Designed frontend architecture for an enterprise application supporting thousands of globally distributed users with approximately 99%+ availability.
- Designed administrative systems for user management, permissions, access control, and large-scale data operations.
- Architected permission systems combining indexed datasets, permission tables, and cloud-based validation services.
- Integrated Google Cloud Platform and Cloud Functions into enterprise application workflows.
- Designed and integrated APIs connecting frontend applications with backend services and internal systems.
- Collaborated with backend engineers, business stakeholders, and infrastructure teams on data structures, API contracts, business logic, and system architecture.
- Participated in architecture decisions involving data model evolution, technology selection, scalability, performance, infrastructure cost, and maintainability.
- Designed automated regression workflows covering complex decision trees and business-critical user journeys using Puppeteer.
- Built automated browser-based reporting and visual validation using Puppeteer.
- Combined Puppeteer and pdf-lib to securely generate complex PDF reports in controlled server environments.
- Produced technical documentation and supported knowledge transfer across engineering teams.
Key Achievements:
- Delivered an enterprise banking application supporting thousands of global users with approximately 99%+ availability.
- Designed a scalable permission and authorization system supporting complex access-control workflows across large datasets.
- Integrated Google Cloud Functions and API-driven validation workflows into enterprise architecture.
- Automated complex regression workflows and decision-tree validation, significantly reducing manual testing effort.
- Built automated browser-based reporting and visual validation using Puppeteer.
- Designed secure PDF generation workflows combining Puppeteer + pdf-lib for large tables, complex charts, and data-intensive visualizations.
- Collaborated with backend and business teams on data architecture, API design, business logic, and technology selection, evaluating scalability, cost, performance, and maintainability.
Client: AEP
- Developed data visualization interfaces for large and complex datasets.
- Implemented interactive charts and large-scale data tables.
- Built server-side PDF generation workflows using Puppeteer and pdf-lib, transforming complex web-based visualizations into structured, presentation-ready PDF reports.
Senior Frontend / Mobile Application Engineer
2019 – 2020
- Developed a mobile customer onboarding platform from the ground up for a major financial institution.
- Designed complex multi-step onboarding workflows with extensive decision trees and business rules.
- Integrated OCR, identity document recognition, facial recognition, and customer data validation services.
- Developed reusable internal frontend libraries and NPM packages to standardize application behavior.
- Created a custom gesture-driven carousel component based on interaction patterns from Hammer.js.
- Collaborated with backend teams and service providers to integrate secure APIs and business logic.
- Implemented frontend validation and secure user workflows under strict financial security requirements.
Key Achievements:
- Helped deliver a mobile banking onboarding platform from zero to production.
- Developed reusable internal NPM libraries to accelerate development and standardize frontend implementation.
- Integrated OCR and facial recognition into secure customer onboarding and identity verification workflows.
- Implemented automated extraction of customer information from identity documents.
- Contributed to secure frontend architecture and validation processes in a regulated financial environment.
Web / Frontend Lead
2016 – 2019
- Led web and frontend development across enterprise, government, pharmaceutical, consumer, and marketing projects.
- Designed and developed websites, interactive applications, promotional platforms, surveys, and browser-based games.
- Worked with PHP, HTML, JavaScript, backend integration, databases, and web infrastructure.
- Managed self-hosted and rented server environments supporting digital campaigns.
- Delivered high-availability websites and interactive experiences for large promotional launches.
- Collaborated with designers, marketing teams, production teams, and clients.
- Explored advanced interactive technologies including Unity, Unreal Engine, and Blender.
Key Achievement:
- Led the complete web development lifecycle across multiple concurrent projects, combining frontend engineering, backend integration, business logic, infrastructure, and digital experience development.
Art Director / Web Developer
2013 – 2016
- Designed and developed event websites, digital platforms, visual identities, and promotional campaigns.
- Created digital and visual production for events ranging from private experiences to large-scale productions with thousands of attendees.
- Delivered integrated web, graphic design, projection, and multimedia solutions for festivals, concerts, DJs, and entertainment events.
- Worked on projects including Holyland Festival and live events at Teatro Metropólitan.
Web Developer / Computer Technician
2006 – 2012
- Began professional work with computers and web technology at approximately 13–14 years old.
- Provided computer repair, operating system installation, software configuration, networking, and technical support.
- Developed websites and web applications using HTML, CSS, JavaScript, PHP, Flash, and ActionScript during the pre-HTML5 era.
- Worked with FTP deployment, web hosting, Linux and Windows environments, and early web technologies.
- Delivered websites and digital solutions for institutional, private, and commercial clients.
- Global Scale: Supported enterprise banking ecosystems serving millions of users with zero-downtime operational requirements.
- Software Architecture: Architected enterprise banking applications supporting thousands of global users and approximately 99%+ availability.
- Performance Engineering: Diagnosed JavaScript memory leaks through V8 heap snapshot analysis, stabilizing applications for 40+ hour continuous sessions.
- WebAssembly: Integrated WebAssembly modules into data-intensive browser applications for near-native computational performance.
- Infrastructure as Code: Automated infrastructure provisioning with Terraform, reducing provisioning workflows from days to minutes.
- Automation: Built automated regression, browser testing, and visual validation workflows using Puppeteer and Playwright.
- Secure Document Generation: Combined Puppeteer + pdf-lib to securely generate complex PDF reports from data-intensive web applications.
- Cloud Architecture: Designed solutions using GCP, Cloud Functions, APIs, Docker, Kubernetes, and Infrastructure as Code.
- Productivity: Contributed to consolidating two applications into one automated solution, increasing reported operational productivity by approximately 150%.
- Mentorship: Mentored developers in JavaScript performance, testing, CI/CD, and infrastructure practices, contributing to an estimated 20% improvement in team code quality.
Universidad Autónoma Metropolitana (UAM)
Communication Sciences — Art & Digital Design / Computer Studies Focus
2012 – 2016 | Incomplete Studies
CS50x — Introduction to Computer Science
Harvard University
Coursework covering algorithms, data structures, memory, security, software engineering, and web development, including C, Python, SQL, JavaScript, HTML, and CSS.
Additional Technical Training: Angular · React · Vue.js · Svelte · Node.js · TypeScript · Bun · Java · Spring Boot · REST APIs · GraphQL · Docker · Kubernetes · CI/CD · Cloud Architecture · Automated Testing · Browser Automation
- Spanish: Native
- English: Professional Working Proficiency — Technical Communication, Documentation & Presentations