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Lucas GimenezFirmat, Santa Fe

I make the piecesfit.

Bachelor's degree in Cyber Defense, currently studying Systems Engineering. I design and build software, systems and digital tools: from the logic no one sees to the screen someone uses every day.

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Overview01—05

01 — Projects

6 projects

Things that already exist.

  1. 01 / Software development · Systems

    Aural POS

    In use by shops

    The point-of-sale system I design and build for AURAL. Shops in Argentina use it to take payments, track stock and close out the register.

    Goal
    Let a shop keep selling when the internet goes down, and pay only for the features it uses.
    Solution
    A cloud point of sale that stores sales offline and syncs them when the connection comes back. Each shop builds its own setup: register, stock, customer accounts, tables, delivery and Mercado Pago payments.
    Architecture
    Each shop is isolated from the rest, permissions are checked on the server and the read backend runs with read-only access. Architecture rules are verified automatically on every change.
    • TypeScript
    • Next.js
    • React
    • Bun
    • Turborepo
    • PostgreSQL (Neon)
    • Drizzle ORM
    • ElysiaJS
    • Zod
    • Mercado Pago
    • Vercel
    auralsoft.com (opens in a new tab)
    Diagram of Aural POSL-01In use by shopsPOSregister · stockADMINpanelREAD APIread-onlyT·01T·02T·03QUEUEsells offline · syncs later

  2. 02 / Systems · Cybersecurity

    ARCA electronic invoicing

    Built · in testing

    An Aural POS module that lets each shop issue electronic invoices for its sales under its own tax ID (CUIT).

    Goal
    Connect the POS to ARCA's web services, which require certificates and digital signatures, without one certificate per shop and without exposing keys.
    Solution
    A single certificate signs the access request and each shop delegates the service. Keys never leave the server, and ARCA's errors are translated into language a shop owner understands.
    • TypeScript
    • node-forge
    • SOAP / XML
    • QR fiscal (RG 4291)
    Diagram of ARCA electronic invoicingL-02Built · in testingTRAWSAAWSFEPKCS#7 · SHA-25612 h token1 certificateCAE + QR

  3. 03 / Web development

    Bilingual websites for Hispanic businesses

    Active service

    Spanish–English websites for Hispanic-owned businesses in the US. Before charging anything, I build a demo with the real business.

    Goal
    Make calling, messaging on WhatsApp or getting directions one tap away, in each customer's language.
    Solution
    Lightweight, mobile-first sites with a language switch and the menu or services up front.
    • HTML
    • CSS
    • JavaScript
    See the service
    Diagram of Bilingual websites for Hispanic businessesL-03Active serviceESENES / ENcall · whatsapp · map

  4. 04 / Web development

    Online store for an agriculture creator

    Delivered

    A sales landing page for an agriculture content creator, built for mobile.

    Goal
    Let their followers buy and enter a giveaway without leaving their phone.
    Solution
    Bundle sales with online payment, receipt upload and giveaway sign-up.
    Diagram of Online store for an agriculture creatorL-04DeliveredBUNDLEPAYRECEIPTGIVEAWAYall from the phone

  5. 05 / Web development

    Website for an industrial company

    Delivered

    Company website, domain and email for an industrial company.

    Goal
    Give the company a proper presence of its own: website, domain and inboxes under its name.
    Solution
    Corporate landing page, domain and email setup, and yearly maintenance.
    Diagram of Website for an industrial companyL-05DeliveredDOMAINwebsiteemailyearly maintenance

  6. 06 / Experiments · Web development

    MANDIBULA.DEV

    This site

    Identity, design system and website for this brand, built from scratch.

    Goal
    A personal brand that can grow with software, systems, security and experimental projects without being tied to a single discipline.
    Solution
    One geometric rule —two pieces that fit together precisely— that shapes the logo, typography, 3D and motion.
    • Astro
    • TypeScript
    • Three.js
    • CSS
    Go to the lab
    Diagram of MANDIBULA.DEVL-06This siteTOL1.00same geometry: logo · 3D · lab

02 — About

I learned to think in systems. Now I build them.

I'm Lucas Gimenez —people call me Mandíbula— and I work from Firmat, Santa Fe, Argentina.

I hold a Bachelor's degree in Cyber Defense and I'm studying Systems Engineering. That mix gave me a way of working: understand the whole problem before writing code, and don't call anything finished until it works in real use.

I founded AURAL, where I design and build Aural POS, a sales system shops use every day. On the side, I build websites for businesses and test ideas in this site's lab.

Degree
Bachelor's degree in Cyber Defense
In progress
Systems Engineering
Now
AURAL · Aural POS
Based in
Firmat, Santa Fe, Argentina

  1. A — Cybersecurity

    Think about risk from the start.

    Permissions, data and edge cases are decided at design time, not when something goes wrong.

  2. B — Engineering

    Design it to grow.

    Architecture and code you can change without fear of breaking what already works.

  3. C — Digital craft

    Take the idea all the way to real use.

    Clear interfaces, careful details and something people actually want to use every day.

03 — What I can build

What I know how to do. And what I'm learning.

Proven

  1. 01

    Business software

    Complete systems, from the data model to the checkout screen: sales, stock, permissions and reports.

    Where to see itAural POS

  2. 02

    Systems and integrations

    Databases, APIs and connections to external services such as payments or electronic invoicing.

    Where to see itAural POSARCA electronic invoicing

  3. 03

    Security by design

    Client isolation, server-side permission checks and keys kept out of the browser: cyber defense training, applied to building.

    Where to see itCyber Defense degreeAural POSARCA electronic invoicing

  4. 04

    Fast websites

    Lightweight, mobile-first sites and, when needed, in two languages.

    Where to see itBilingual websites for Hispanic businessesOnline store for an agriculture creatorWebsite for an industrial company

  5. 05

    Identity and interaction

    Visual systems, real-time 3D and interactive prototypes in the browser.

    Where to see itMANDIBULA.DEV

Exploring

What I'm studying or want to go deeper into. Not credentials yet.

  • Security applied to development: threat modeling and code review
  • Process automation and internal tools
  • Data visualization
  • Real-time graphics and WebGL

Tools used in these projects

  • TypeScript
  • React
  • Next.js
  • Bun
  • PostgreSQL
  • Drizzle ORM
  • ElysiaJS
  • Zod
  • Astro
  • Three.js
  • HTML / CSS
  • Vercel

04 — Lab

A place to try ideas.

Experiments made for this site. They run in your browser and send nothing to any server.

L-01 · Parametric geometry

Occlusion

The logo mark comes from this function: teeth, tolerance and opening. Change the values and download your version.

Teeth 3 · tolerance 1.00 · module 4.00

Mark parameters

L-02 · Visible cryptography

Fingerprint

Type anything: I compute its SHA-256 and draw it. Change a single letter and watch everything change —the avalanche effect.

SHA-256: d91b81702974757351deac71e849510fc5d6d6f96b245159ea1b57454f91dc6c

Text for the fingerprint

Bits changed from the previous one: —

05 — Contact

Let'sbuild it.

A system, a tool, a website or an idea that doesn't have a shape yet. Tell me what you need and we'll figure out where to start.

hola@mandibula.devDownload CV