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Leonardo Collatto · Backend engineer

8 years building products that people need.

Backend-heavy, customer-driven. Eight years shipping across ERP, SaaS, global payroll, and more — I care about catching problems before users do, shipping things that hold up under pressure, and building software people can rely on.

Explore labsDownload CV
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Side projects

Things I build after hours.

Product-shaped experiments. Building things people want.

Inventory

Tech stack
Typescript
Javascript
Node.js
React.js
NestJS
Prisma
MySQL
PostgreSQL
MongoDB
Redis
AWS
Docker
Github Actions
Typescript
Javascript
Node.js
React.js
NestJS
Prisma
MySQL
PostgreSQL
MongoDB
Redis
AWS
Docker
Github Actions
Typescript
Javascript
Node.js
React.js
NestJS
Prisma
MySQL
PostgreSQL
MongoDB
Redis
AWS
Docker
Github Actions

By the numbers

8+
Years of experience
From startups to scaleups to enterprise.
6+
Countries & regions
USA, Germany, UK, Colombia, Mexico, Brazil, and more — async-first.
5+
Industries
HR, ERP, SaaS, AdTech, construction tech, developer tools, and more.

Selected work

Career highlights

Deep dives into systems where backend choices directly moved revenue, velocity, or reliability.

Intelligent Ad Monetization Library - Alright

Led the development of a lightweight JavaScript library aimed at increasing ad revenue for publisher websites struggling with standard monetization solutions. The project increased the company revenue by 20% and sped up the time to market by 5 times.

JavascriptAWSPHPMySQL
Open story

ERP Presentation Engine – Everest

Maintained an engine to streamline and standardize frontend-backend communication in Everest’s ERP platform by allowing developers to define application behavior through declarative JSON schemas and implementation files. Used by 70+ developers.

TypeScriptNode.jsWebSocketSocket.ioPostgreSQLReactJest
Open story

2D Markup Service Migration – Autodesk BIM 360

Contributed to a high-impact annotation system used by thousands of users in Autodesk's BIM 360 platform. Focused on modernizing a legacy service to improve performance, maintainability, and security.

Node.jsNestJSPrismaPostgreSQLRuby on RailsReactJestJenkins
Open story

Experience

Career timeline

Roles where I owned services end-to-end — from schema to on-call.

Backend Engineer

Deel
July 2025 – Present

Working on backend services for time-off and payroll systems at Deel, focusing on performance optimization, real-time data processing and system reliability.

Impact

  • Prevented recurring deadlocks in the codebase using advisory lock technique in a reusable way
  • Improved performance by 30% querying time off related data to payroll report
  • Collaborated with team on time-off payroll optimization, creating features, tests, and improving performance
  • Building a real-time data processing pipeline for payroll processing related to time-off data
Node.jsTypeScriptPostgreSQLDockerAWSJest

Senior Software Engineer

Everest Systems
Jan 2023 – June 2025

Working on core platform services for a large-scale ERP system, focusing on extensible architecture and automation tools.

Impact

  • Co-led development of a centralized status management tool with rule-based transitions and automated task execution
  • Enhanced workflow builder for complex business automation, including Employee Expense processes
  • Maintained and evolved a real-time UI presentation framework responsible for rendering dynamic views via WebSocket connections
Node.jsTypeScriptPostgreSQLReactSocket.ioDockerKubernetesAWSJestGitHub Actions

Backend Software Engineer

Globant (Autodesk Project)
Oct 2021 – Jan 2023

Modernized a legacy markup system used by thousands on Autodesk’s BIM 360 platform, ensuring reliability and scalability.

Impact

  • Rewrote legacy Ruby on Rails service using Node.js, NestJS, and Prisma
  • Built full test coverage with Jest, including unit and E2E tests integrated into Jenkins pipelines
  • Designed and maintained database schemas and handled integration with multiple internal services
  • Improved React components in collaboration with frontend and UX teams
Node.jsNestJSTypeScriptPrismaPostgreSQLBullMQDockerJenkinsJestReact

Founding Fullstack Engineer

Alright Media
Feb 2018 – Oct 2021

Led the core product development at a startup focused on ad monetization, infrastructure, and product strategy.

Impact

  • Built and led development of a JavaScript library that increased client ad revenue by 30% and reduced implementation time by 5x
  • Maintained client dashboard and backend services using React, PHP, and Node.js
  • Managed cloud infrastructure on AWS (EC2, S3, Route 53) to ensure uptime and scalability
  • Acted as Tech Lead, overseeing sprints, task assignments, and team velocity
JavaScriptTypeScriptNode.jsReactPHPAWS (EC2, S3, Route53)