Leandro Cotti
Leandro Cotti
Full-Stack Engineer · UX/UI Designer

Designing and building
thoughtful digital
products

I work at the intersection of design and development, building clear, scalable and enjoyable digital experiences, from concept to production.

Design and development of digital products

Experience

  • June 2025 - Present

    Software Engineer · Fullstack & UX/UI

    Freelance

    Design and development of end-to-end digital products, from research and UX/UI in Figma to fullstack implementation.

    • Next.js, Node.js and MongoDB
    • Integrations with payments, maps, authentication and messaging
    • Focus on performance, scalability and user experience
  • May 2024 - May 2025

    Backend Software Engineer (Mid-level)

    Vana

    Development and maintenance of event-driven backend services using AWS Lambdas.

    • TypeScript · Domain-Driven Design (DDD)
    • Event-driven architecture
    • Code reviews and quality best practices
  • September 2022 - September 2023

    Fullstack Developer (Mid-level)

    FactoryFix

    Development of key features for a human resources platform.

    • Performance optimization
    • Code reviews
    • Shape Up methodology
  • July 2021 - September 2022

    Software Engineer (Mid-level)

    GlobalLogic

    Development of applications for Alexa devices in corporate environments.

    • AWS Lambdas
    • Alexa for Business & Hospitality
    • Unit and integration testing
  • July 2019 - July 2021

    Backend Developer

    Widergy

    Backend development of a multi-tenant, multi-channel chatbot platform for public utility companies such as Edenor, Eden, Edes and Camuzzi, focused on scalability, real-time communication and automation of customer support workflows.

    • Multi-tenant, multi-channel chatbot architecture (Web, WhatsApp, Facebook)
    • Integration with Dialogflow for intent detection
    • Configurable, channel-agnostic conversational flow engine
    • Real-time messaging using Socket.io and Redis
    • Conversation transfer and management between agents
    • Integrations with client APIs (invoices, balances, claims)
    • Data and reporting persistence with MongoDB and PostgreSQL
    • WhatsApp integration via Wavy
    • Email delivery and tracking system using AWS SNS and SES
    • Unit testing with Mocha and Chai
    • Work using Scrum and Kanban methodologies with Jira

Projects

Real-world products where I combine full-stack development and UX/UI design, with a strong focus on user experience, performance, and scalability.

Woof! screenshot 1
Woof! screenshot 2
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Woof! screenshot 6

Woof!

An all-in-one pet services platform that connects users with caregivers, walkers, veterinarians, trainers, photographers, transportation services and product marketplaces. I designed the complete UX/UI experience in Figma and developed the product end-to-end using Next.js and MongoDB. The platform integrates multiple external services for authentication, maps, real-time messaging, notifications and file management, with a strong focus on a smooth, secure and scalable user experience.

  • Next.js
  • MongoDB
  • UX/UI Design
  • Figma
  • Auth0
  • Mapbox
  • HERE API
  • Mailgun
  • Pusher
  • Cloudinary
  • Rollbar

Skills & tools

Technologies and tools I use on a daily basis, focused on building solid, scalable, and well-designed products.

Frontend & UX

  • React
  • Next.js
  • TypeScript
  • Tailwind CSS
  • Figma

Backend

  • Node.js
  • Express
  • NestJS
  • REST APIs

Databases & Real-time

  • MongoDB
  • DynamoDB
  • PostgreSQL
  • Socket.IO
  • Pusher

Cloud & DevOps

  • AWS (EC2, S3, EB, Lambda)
  • API Gateway
  • EventBridge
  • GCP
  • Vercel
  • SES / SNS
  • Alexa for Business
  • GitHub Actions

Integrations & Services

  • HERE API
  • Mapbox
  • Auth0
  • Mailgun
  • Cloudinary
  • cron-job.org

Observability

  • Rollbar
  • ELK
  • Cloudwatch

Workflow & Methodologies

  • Git
  • GitHub
  • Scrum
  • Kanban
  • Jira
  • Linear

Let's talk

I'm open to new opportunities where I can contribute through full-stack development and UX/UI design, building solid and thoughtfully crafted digital products.