Federico Leiva

Available for projects

I build the system your business is currently running on spreadsheets and WhatsApp.

Web development, online stores and custom applications. I work solo, directly with you, and ship something usable every two weeks.

Buenos Aires, Argentina · remote · I reply within 24 h

PROJECTS

Recent work

A selection of products I designed, built and shipped to production.

PhoneGuard — Mobile app · Personal safety

PhoneGuard

Mobile app · Personal safety

Personal safety app for iOS and Android. It triggers emergency, suspicious activity and home burglary alerts, links trusted devices and lets you set an alert radius. Google sign-in and PIN lock.

Stack React Native · Expo · NestJS · PostgreSQL · Redis · Firebase

  • iOS & Android
  • Google sign-in
  • Geolocation
  • Real-time alerts
Signature Analysis — Web platform · AI-assisted document forensics

Signature Analysis

Web platform · AI-assisted document forensics

A platform for handwriting experts: it processes document batches, detects and crops every signature and suggests who it belongs to with a confidence score. Plus manual review, grouping by signer and a full audit trail.

Stack React · NestJS · FastAPI · Celery · PyTorch · PaddleOCR · PostgreSQL + pgvector

  • Batch processing
  • AI suggestions
  • Review dashboard
  • Audit trail
Bonnie Cookies & Co. — E-commerce · Online ordering

Bonnie Cookies & Co.

E-commerce · Online ordering

Mobile-first online store for an artisanal cookie brand. Catalog with promotions, cart, and delivery or in-store pickup. Takes card payments through Mercado Pago or bank transfers with receipt upload, and sends automated WhatsApp updates on every order status change.

Stack React · NestJS · PostgreSQL · Mercado Pago · WhatsApp Cloud API

  • Catalog & cart
  • Card payments
  • Automated WhatsApp
  • Delivery & pickup
What I do

Four things, all four end to end

Stores and sites

Catalog, payments and shipping working end to end. Fast on a phone, which is where people buy from you.

Custom applications

Web or mobile, for the thing your business does every day and still does by hand.

Integrations

Payments, WhatsApp, Google Maps, invoicing, your stock system. Getting them to talk to each other.

Production and support

Online, fast, and with someone answering when something breaks.

How I work

Four stages, and you take something away from each

  1. 01

    Understand the business

    A conversation and a review of how you work today. You leave with the scope written down and the quote closed, before paying anything.

  2. 02

    Define and design

    Screens and flows before any code. You leave with a prototype you can click through and correct.

  3. 03

    Build in stages

    Deliveries every two weeks on a staging environment. Each stage ships something that works, not a progress bar.

  4. 04

    Launch and stay

    Deployment, measurement and a month of adjustments included. Ongoing support after that, if you want it.

Contact

Tell me what is holding your business back.

If it helps, I will reply with a rough scope and price. No commitment, no hour-long discovery call.

or email me at federicoleiva.dev@gmail.com