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Oscar Hernandez GamezOH

Oscar Hernandez Gamez

Fullstack Developer

€280/day
Ciudad de México, MX
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Oscar

I am a Fullstack Developer with over 10 years of experience helping companies turn complex ideas into functional, scalable, and user-friendly web and mobile applications.

I work with modern technologies such as Flutter, React, Python, Java, Spring, and AWS, developing everything from intuitive interfaces to robust backends and efficient microservices.

What sets me apart is my ability to solve real business problems with complete technical solutions, optimizing processes, improving user experience, and reducing development times through automation and best practices.

I have participated in the development of:
🔹 Cross-platform mobile applications with Flutter
🔹 Dashboards and reports in React and Python
🔹 Backend systems with complex logic and massive processing (Java, Python)
🔹 Automation with AWS Lambda, Step Functions, and SQS
🔹 Integration of third-party APIs (payments, social media, external services)
🔹 Solutions for sectors such as telecommunications, banking, public administration, and startups

I am focused on generating impact through agile development, teamwork, and continuous improvement. Whether in a new project or optimizing an existing one, I provide reliable, clean solutions aligned with client objectives.
  • Spanish

    Native or bilingual

  • English

    Conversational

Remote only
Primarily works remotely

Experience

  • XML ,Millicom (Tigo)
    Senior Software Developer
    BANKING AND INSURANCE
    March 2022 - August 2024 (2 years and 5 months)
    Ciudad de México, Mexico
    Developed applications for Android and iOS using Flutter, developing complete modules based on designs provided by UX. Developed microservices in Python within a Docker and Knative structure. Generated Lambdas for massive processes. Developed SQS for queuing processes in Lambdas. Designed an application for reports in React. Created a complete flow using Step Functions for virtual credit card processes. Managed SecretManager for new secrets.
    Python (Programming Language) Java Flutter Amazon Web Services (AWS) React.js
  • MobileCard
    SQL Programmer
    BANKING AND INSURANCE
    November 2021 - January 2022 (2 months)
    Ciudad de México, Mexico
    Advanced design and administration of databases in MySQL, PostgreSQL, and OrientDB, ranging from the creation of optimized schemas to the implementation of functions, stored procedures, and complex performance-oriented structures. Experience in designing relational and graph-oriented models, applying modeling tools (such as ER/Studio, Draw.io, PgModeler, among others) to structure entities, relationships, and critical information flows.

    Responsible for developing and implementing business logic at the database level through stored procedures, triggers, materialized views, transactions, and concurrency control mechanisms. Extensive experience in managing transaction storage processes, ensuring data integrity, consistency, and high availability.

    Additionally, I have worked on optimizing SQL queries, indexes, execution plans, and partitioning strategies, directly contributing to improving the overall performance of applications and services that consume these databases.
    Oracle PL/SQL OrientDB MySQL/MariaDB PostgreSQL
  • ALPHACREDIT
    Fullstack Developer
    BANKING AND INSURANCE
    August 2020 - December 2021 (1 year and 4 months)
    Ciudad de México, Mexico
    • Creation of React Modules for various views such as reports, implementation of components for use in other components like Grid, Combobox, Check, input, Buttons, among others. Developing microservices in Python using various tools for report generation, storage in AWS S3, and document reading. Implementing all logic for credit payment distribution. Development of functions and procedures in Postgres, structuring for payment applications, queries, and reports in the collections area, designing tables, indexes, among others. Use of version storage tools like Git and GitLab.
    Python (Programming Language) ReactJS PostgreSQL AWS S3

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Education

  • Mechanical Electrical and Electronic Engineer
    Faculty of Higher Studies Cuautitlán (UNAM.)
    2005
    Ingeniero Mecánico Eléctrico y Electrónica

Certifications

  • ITIL V3 (Foundation)
    EXIN
    2012

Skill set

Categories