JAVIER VEGA MOLINA

Experiences

My professional journey building scalable systems, AI-powered products, and end-to-end web applications.

  1. Software Engineer

    Current

    Banco Bolivariano

    Feb 2026 – Present · 9 mos

    • Full-time
    • On-site
    • Guayaquil, Ecuador
    • Reduced remittance cancellations by 50% through the implementation of phonetic search with Amazon OpenSearch, improving beneficiary identification across large-scale banking datasets.
    • Integrated external correspondents through API-based architectures using AWS serverless services, enabling scalable and secure communication between banking systems and external partners.
    • Migrated the interbank payments integration to support immediate remittance payments through BANRED APIs, implementing key- and credential-based authentication for real-time transaction processing.
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    • Supervised the development of a centralized security module with a fully AWS-based architecture for the bank's internal back-office applications.
    • Supervised the development of a reconciliation back-office application with a fully AWS-based architecture, supporting operational banking processes.
    • Developed banking services and integrations using Java, Spring Boot, AWS, REST APIs, DynamoDB, OpenSearch, and cloud-native architectures.
    • Java
    • Spring Boot
    • AWS
    • DynamoDB
    • OpenSearch
    • REST APIs

  2. Telecu

    Sep 2023 – Dec 2025 · 2 yrs 4 mos

    • Full-time
    • Remote
    • Guayaquil, Ecuador

    1. Semi-Senior Full-Stack Developer

      Promoted

      Oct 2024 – Dec 2025 · 1 yr 3 mos

      • Led full software development lifecycles from architecture to deployment, including mentoring a junior developer.
      • Architected and deployed a RAG-based chatbot that automated 30% of client inquiries.
      • Built AI-powered voice bots and WhatsApp automation, increasing qualified leads by 15%.
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      • Developed AI agents handling 500+ appointment bookings per month, reducing administrative workload by 20 hours/week.
      • Built a reporting system used by 50+ field technicians, improving daily completion rates by 20%.
      • Integrated Paymentz, WHMCS, and Datil into a unified billing system, reducing invoice processing time by 85%.
      • Designed a fault-tolerant notification system ensuring 100% delivery reliability.
      • TypeScript
      • Node.js
      • NestJS
      • React
      • Python
      • LangChain
      • FastAPI
      • RabbitMQ
      • PostgreSQL
      • Docker
      • Grafana

    2. Junior Full-Stack Developer

      Sep 2023 – Sep 2024 · 1 yr 1 mo

      • Developed backend and frontend features for internal platforms and client-facing applications.
      • Implemented REST APIs and microservices, improving system responsiveness and reliability.
      • Provided production support, resolving critical issues and improving platform stability.
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      • Contributed to integrations with external providers including Paymentz, WHMCS, and Datil.
      • TypeScript
      • Node.js
      • Express
      • NestJS
      • React
      • RabbitMQ
      • PostgreSQL

  3. Software Engineer

    Prefectura del Guayas

    Oct 2023 – Feb 2024 · 5 mos

    • Contract
    • Remote
    • Guayas, Ecuador
    • Developed a tourism mobile application for the Guayas province using a modular microservices backend.
    • Improved tourism engagement — 90% of users reported feeling more motivated to visit after using the app.
    • React Native
    • TypeScript
    • NestJS
    • Azure

  4. Full-Stack Developer

    Sipecom S.A.

    Feb 2023 – Aug 2023 · 7 mos

    • Internship
    • On-site
    • Guayaquil, Ecuador
    • Upgraded legacy PHP 5 systems to PHP 8.2, resolving security vulnerabilities and retaining a major client responsible for 60% of revenue.
    • Migrated on-premise applications to Azure Cloud, reducing infrastructure and maintenance costs by 70%.
    • PHP
    • Spring Boot
    • MySQL
    • Azure
    • Docker
    • Nginx

  5. Teaching Assistant — Programming Languages

    ESPOL Polytechnic University

    Sep 2022 – Dec 2022 · 4 mos

    • Part-time
    • Remote
    • Guayaquil, Ecuador
    • Taught programming languages including PHP, Ruby, Dart, Python, JavaScript, and Clojure to students enrolled in the Programming Languages course.
    • Assisted students with assignments, debugging, functional programming concepts, and project development.
    • Python
    • Ruby
    • Dart
    • JavaScript
    • PHP
    • Clojure

  6. Frontend Web Developer (Internship)

    ZEDE del Litoral

    May 2020 – Sep 2020 · 5 mos

    • Internship
    • Redesigned the company’s main website and implemented new features including a contact form and an image carousel.
    • Improved user experience and increased inbound client inquiries through a more modern, responsive interface.
    • HTML
    • CSS
    • JavaScript