David Jacas Leila

Hard skills

• C# .NET

  Object-oriented programming, service layer and data access.

• WinUI 3

  Desktop applications with XAML, the MVVM pattern and custom controls.

• PostgreSQL

  Schema modelling, queries and synchronization against a local replica.

• SQL

  Schema design and queries over PostgreSQL, SQLite, MySQL and SQL Server.

• Java

  CRUD with MySQL, object-oriented back-end.

• HTML5 / CSS

  Responsive layouts using CSS variables.

• JavaScript

  Front-end interactivity and data consumption.

• Git

  Versioning with a normalized workflow.

• UML

  Systems analysis and design prior to implementation.

Soft skills

• Continuous learning
• Teamwork
• Effective communication
• Proactivity
• Time management
• Critical and analytical thinking
• Problem solving
• Leadership
• Flexibility

• Own product

  2025 — Present

  POS Autopartes — point of sale and stock management

  A point-of-sale system for auto parts shops, built end to end in C# .NET and WinUI 3. It is the project I am working on right now and the first one I am preparing to sell.

  • Multi-branch and multi-terminal: each till runs its own session and consolidates against the central PostgreSQL database.
  • Offline mode with incremental synchronization over a local SQLite mirror: if the network drops, the sale is still recorded and uploaded once it returns.
  • Full audit trail with field-by-field diffs, three permission levels and a support mode kept separate from day-to-day use.
  • Inventory, sales, sales lookup, business metrics and per-user performance modules, with native receipt printing and bulk product import.

  • 12.141

    lines of code

  • 38

    services

  • 19

    screens

  • 15

    tables

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  My role: Analysis, design, development and rollout

  • C# .NET
  • WinUI 3
  • PostgreSQL
  • SQLite

• Transporte Leila S.A.S.

  2020 — 2024

  Business management system

  Management system developed as part of a Systems Engineering research project, using a family-owned transport company in north-western Argentina as its case study. It remained an academic exercise and was never deployed.

  • Requirements gathering, analysis and design alongside several teams throughout my degree.
  • A model aimed at resource management and growth for the company under study.
  • C# back-end with a desktop application and a local SQL database.

  My role: Analysis, design and back-end development

  • C#
  • .NET
  • SQL Server
  • UML

• Teatro Municipal Rosita Ávila

  2021 — 2022

  Digital seat management system

  System proposed as an implementation practice and as a study and teamwork method for Fundación León.

  • Seat booking plus display of available shows and schedules.
  • Back-end programming and the data access layer.
  • Built as a team, applying prior analysis and data modelling.

  My role: Back-end and data connection

  • C#
  • .NET
  • MySQL

1. Information Systems Engineering

   Universidad Tecnológica Nacional — FRT · 2019 — Present

2. Full Stack Programming

   Oracle Alumni · 2022 — 2023

   • ·Programming logic (75 hs)
   • ·Front-End: HTML5, CSS, JavaScript (110 hs)
   • ·Back-End: Java (110 hs)

3. Desktop Programming

   Fundación León · 2022 — 2023

   • ·C# .NET — Object-Oriented Programming
   • ·MySQL
   • ·UML

4. Web development

   Argentina Programa · 2021 — 2022

   • ·HTML5, CSS and JavaScript

5. A2 English

   Fundación Instituto Latinoamericano · 2021