Senior Oracle at Tata Consultancy Services·Founder of MexaByte

Eng.

Edgar Guadalupe López Tinajero

Computer Engineer / Senior Oracle Engineer|

OracleJavaSQLAzurePL/SQLIA

Over 10 years keeping enterprise systems running every single day.

Oracle & SQLdatabases, queries and diagnostics for mission-critical systems.
DevelopmentJava, Oracle and published mobile apps; currently growing in Java towards senior level.
Technical supportfast, reliable resolution of production incidents.
Artificial intelligenceClaude, ChatGPT and Gemini to deliver faster and better.

Download CV See products Contact me

LinkedIn WhatsApp mexabyte.app@gmail.com Facebook

Current roleSenior OracleTata Consultancy Services

Experience10+ yearsDevelopment & support

Products3 liveOwn apps & websites

EducationB.S. Computer Eng.UTEG · Campus Olímpica

Explore

About me

Engineering that keeps business running

What I do, what I am looking for and what I am working on.

What I do

Senior Oracle at Tata Consultancy Services

Available

I provide technical support for mission-critical enterprise applications built on Oracle for global clients: I analyze and resolve production incidents, diagnose data with SQL and PL/SQL, automate tasks with Unix scripts and collaborate with the team in the Microsoft Azure ecosystem.

What I am looking for

Development roles with Java, Oracle, SQL and Azure.
Application support roles (L2 and L3).
Custom projects for businesses and companies.
Customers for MexaByte products.

What I am working on

TlakkoAI collection app, about to launch on Google Play.
Javasharpening my skills to reach senior level.
EnglishB1 level, working towards C1 in about a year.
MexaBytesubscription platforms for schools and companies.

Why work with me

Enterprise experience, product mindset

What I bring to a technology team and to a business that needs software.

10+years in enterprise systems

3technology & business companies

3own products launched

24 hmaximum response time

World-class critical systems

Over 10 years at global consulting firms like Tata Consultancy Services and Cognizant, caring for applications that cannot stop.

From the database to the phone

I master the data layer with Oracle and SQL, and I also build complete mobile apps and websites.

AI in everyday work

Claude, Claude Code, ChatGPT and Gemini to deliver faster, with higher quality and fewer errors.

Always learning

Currently growing in Java towards senior level and in English towards C1.

Philosophy

“The best software is the one nobody notices: it works every day, it is easy to understand and it grows without breaking.”

mexabyte.pkb

CREATE OR REPLACE PACKAGE BODY mexabyte IS
  PROCEDURE deliver(p_idea VARCHAR2) IS
  BEGIN
    design(p_idea);
    build(quality => 'high');
    publish;
    support('24/7');
  END;
END mexabyte;

MexaByte products

Already live

Real products, published and in use. And what is coming next.

Android & iOS app · Subscription

Tlakko

Take a photo of a banknote or coin and AI tells you what it is, where and when it is from, and whether it is already in your collection.

AI recognition
Cloud backup
Subscription plans

tlakko.com

Personal collection · Web

El Oro Azteca

Online numismatic collection: banknotes from Mexico and the world with photos, filters, value summary and AI photo search.

eloroazteca.com

Website

tlakko.com

App landing page with plans, an interactive game, sounds and legal pages.

Visit

In development

Coming soon

Digital English school

Platform for schools, teachers and students: school management, activities and learning tracking.

Per-school subscription

Coming soon

Inventory & maintenance

Equipment tracking with preventive and corrective maintenance for businesses, companies and individuals.

Monthly subscription

Coming soon

PC optimizer

One-click computer cleanup and optimization: more space, more speed and a clear diagnosis.

Monthly subscription

Let's work together

Have a project or a job opening?

Choose your path. I reply fast.

Are you a recruiter?

I am looking for development roles (Java, Oracle, SQL, Azure) and application support roles. Download my updated résumé.

Work mode: Remote or hybrid
Location: Guadalajara, MX
English: B1, working to C1
Response: Under 24 h

Spanish CV English CV View LinkedIn

Need software built?

Mobile apps, websites, custom systems or support for your business. The first call and the quote are free.

First consultation: Free
Progress: Every week
Delivery: Live and working
After launch: Support included

Get a quote on WhatsApp Send an email

LinkedIn WhatsApp mexabyte.app@gmail.com Facebook

When you contact me, your data is only used to reply. See the Privacy notice.

Career

Professional experience

Over 10 years in enterprise systems, and now my own products too.

MexaByte2026 – Present

Founder & Developer

Mobile apps, websites and subscription platforms

Guadalajara, Jalisco · Remote

Key achievements

Tlakko app (Android & iOS)Designed and built end to end an app that recognizes banknotes and coins with AI, with subscription plans, an admin dashboard and cloud backup.

Websites in productionLaunched tlakko.com and El Oro Azteca, with photo search, an interactive game and legal pages generated from the same code.

Data protectionEach user can only access their own data, enforced directly in the database, in compliance with Mexican privacy law.

AI-accelerated developmentClaude, Claude Code, ChatGPT and Gemini to deliver faster and with higher quality.

React NativeTypeScriptSupabasePostgreSQLClaudeClaude CodeCloudflare

Tata Consultancy ServicesMay 2022 – Present

Senior Oracle · Application Support

Support for mission-critical enterprise applications on Oracle

Remote

Key achievements

Production incident resolutionAnalyze and resolve incidents in critical applications, reducing business downtime.

SQL & PL/SQL diagnosticsRoot-cause analysis in Oracle Database and SQL Server, with safe data and process fixes.

AutomationUnix Shell scripts that reduce manual work and operational errors.

Microsoft Azure ecosystemDaily collaboration with global teams using the client's Azure platform.

Oracle DatabaseSQLPL/SQLOracle Forms & ReportsSQL ServerAzureAzure DevOpsServiceNowUnix Shell

Cognizant Technology Solutions MéxicoAugust 2018 – April 2022

Programmer Analyst · Oracle

Development and support of Oracle enterprise solutions

Hybrid

Key achievements

Enterprise developmentBuilt and maintained Oracle Forms & Reports applications used in daily operations.

Business logicProcedures, functions, triggers and packages in PL/SQL on Oracle Database.

Production supportIncident handling and resolution with ServiceNow, ensuring service continuity.

Oracle DatabasePL/SQLSQLOracle Forms & ReportsOracle SQL DeveloperServiceNow

Tierra y Armonía · Construction companySeptember 2013 – July 2018

Information Technology

Technical support, business systems and infrastructure

On-site

Key achievements

Business systemsSupport and maintenance of the Enkontrol ERP and CONTPAQi for administration and accounting.

DatabasesBasic administration of SQL Server and Sybase.

Data analysisQlikView analysis models for decision making.

Infrastructure & supportWindows Server (Active Directory, DHCP, remote desktop), networks, hardware and IP telephony.

SQL ServerSybaseERP EnkontrolCONTPAQiQlikViewWindows Server

Capabilities

Technical expertise

A solid enterprise foundation in Oracle and SQL, plus Java, Azure, mobile development and AI.

Level by technology

Oracle Database & SQLSenior
PL/SQLSenior
Application supportSenior
AzureIntermediate
AI-assisted developmentAdvanced
Java · growing to seniorIntermediate
PythonIntermediate
C++Intermediate
LinuxIntermediate
React Native & JavaScriptIntermediate

Databases

Oracle Database (11g and later)SQLPL/SQLOracle SQL DeveloperSQL ServerMySQLPostgreSQLSybase

Enterprise development

Oracle Forms & ReportsJavaPowerBuilderERP EnkontrolCONTPAQiQlikView

Languages

JavaPythonC++TypeScriptJavaScriptSQLPL/SQLUnix Shell

Mobile & web

React NativeExpoNode.jsHTML & CSSAndroidiOSPWA

Cloud & DevOps

AzureAzure DevOpsAzure FundamentalsSupabaseCloudflareNetlifyAPIs REST

Artificial intelligence

ClaudeClaude CodeChatGPTGeminiComputer visionPrompt engineering

Operations & tools

ServiceNowITILScrumGit & GitHubLinuxWindows ServermacOS

SpanishNative

EnglishB1 · working towards C1

LocationGuadalajara, Mexico · Remote

Services

How I can help you

For businesses, companies and entrepreneurs who need technology that works.

Custom apps & websites

Android and iOS apps, websites and admin dashboards, from idea to launch.

Oracle & SQL consulting

Query optimization, database diagnostics and system modernization.

Support & maintenance

Preventive and corrective maintenance of systems and equipment so your operation never stops.

Subscription software

Ready-to-use platforms with monthly billing and updates included.

How we work

Let's talkTell me your idea or problem. Free of charge.
ProposalClear scope, timeline and budget, in writing.
DevelopmentWeekly progress so you see your project grow.
LaunchI leave it live and keep supporting you.

Get a free quote on WhatsApp

Education

Education & continuous learning

Graduated

B.S. in Computer Engineering

Centro Universitario UTEG · Campus Olímpica

2016

High school

Technical High School in Programming

Gómez de Mendiola

2013

In progress

English

From B1 to C1 in about a year

English school · 2026–2027

In progress

Java

From intermediate to senior: daily practice and real projects

Continuous learning · 2026

Courses

Oracle SQL & PL/SQL, beginner to advanced
Java from zero to expert
Azure Fundamentals
Scrum
Diploma in Research and Technological Innovation Projects
Communication and interpersonal skills