Lucas Antonio Ramos Sartori
Senior Software Engineer · Ruby on Rails · Remote · LATAM · Brazil
Senior Software Engineer with nearly 9 years of experience, focused on building, evolving, and scaling Ruby on Rails applications for U.S.-based and international companies. Strong background in legacy systems, multi-tenant architectures, APIs, AI-driven features, and long-term maintainability.
Professional Experience
Senior Backend Ruby Developer
Ballast Lane Applications · Remote · USA · Sep 2024 – Present
- Working on TripleSeat, a large-scale event and restaurant management platform
- Developing new features, improving performance, and maintaining complex integrations
- Applied prompt engineering and generative AI techniques to build reliable workflows that automated tasks, improved information retrieval, and accelerated development processes.
- Contributing to Inspect Point, a 10+ year multi-tenant legacy system
- Designing REST APIs, addressing technical debt, and improving system reliability
Key Achievements
- At TripleSeat - Redesign the prompts from >4k Lines to ~450 lines, following Prompt Modular Architecture, reducing company cost with Gemini in 60% with better results
- At TripleSeat - Redesign the duplication detection service, improving the system reliability and performance from between 4 minutes to more than 20 resulting in timeout, to between 1 to 4 minutes
- At InspectPoint - Created the CI giving the team the possibility to create RSpecs, before no one in the team was able to do it, and directly responsible to increase the coverage to more than 50%
- At InspectPoint - Responsible for the backend APIs, making the integrations for internal systems and third-party
- At InspectPoint - Several performance and security issues fixed like: N+1, find_each, MassAssigment, SqlInjection
Senior Software Engineer
FullStack Labs (NoFraud) · Remote · USA · Nov 2021 – Mar 2024
- Worked on a high-volume e-commerce fraud detection platform
- Rebuilt merchant dashboards and reporting systems
- Rebuilt customer document upload workflows
- Improved security by integrating Brakeman and fixing vulnerabilities
Key Achievements
- Responsible for recreate the Dashboard
- Increased test coverage from 2% to over 40%
- Made de integrations with several Third-part platforms like BigCommerce, AdobeCommerce
- Several performance and security issues fixed like: N+1, find_each, MassAssigment, SqlInjection
Senior Software Engineer / Tech Lead
Grupo EUAX · Remote · Brazil · Dec 2020 – Nov 2021
- Led development of Twygo, a 10+ year online education platform
- Acted as Ruby on Rails specialist and technical reference
- Led a team of 4 developers
- Balanced feature delivery with refactoring and system stability
- Developed and maintained features for the Twygo platform
- Assisted the team with product and technical questions
- Worked extensively with legacy codebases
Key Achievements
- Several performance and security issues fixed like N+1, find_each, MassAssigment, SqlInjection
Fullstack Developer
Lets · Hybrid · Brazil · Apr 2019 – Nov 2020
- Worked on multiple projects using Angular, Vue.js, Rails, and Node.js
- Developed SPAs and backend APIs
- Participated in mobile projects using Flutter, NativeScript, and Kotlin
Key Achievements
- Delivered several projects for Startups, NGOs, factories and many other category of companies
Android Developer
Stape Music · Remote · Sep 2018 – Apr 2019
- Developed new features and fixed bugs for a music streaming app
- App fully developed in Kotlin
- Supported monetization workflows for musicians
Fullstack Developer
Teorema Sistemas · Guarapuava · Brazil · Jun 2017 – Sep 2018
- Worked on an ERP system using Spring Boot, Angular, and Kotlin
- Designed and implemented REST APIs
- Rewrote backend from JEE to Spring Boot and Kotlin
- Rewrote mobile app from Java with no patterns to Kotlin, MVVM, Retrofit and Realm
Key Achievements
- Improved several performance issues like N+1 in the entire system
- Reduced offline sync time from ~4 hours to 10–15 minutes
Education
Specialization in Mobile Web Application Development
UniGuairacá Centro Universitário · 2019 – 2021
Bachelor in Internet Systems Technology
Federal University of Technology · 2014 – 2019
Side Projects
uButeco
Open-source platform to manage restaurant orders, inventory, and kitchen panels, featuring real-time updates, role-based access, and customizable UI.
Ruby on Rails · PostgreSQL · Angular · Angular Material · NgRX · JWT · REST APIs
Recommendations
“Lucas is a strong developer, hardworking, and a great collaborator. He consistently goes the extra mile to deliver quality work.”
“Lucas is not only a competent Ruby developer, but also brings positivity and energy to the team. A pleasure to work with.”
“Extremely committed, he always gives his best and has a great desire to learn. He's the kind of person who's truly dedicated; we can always count on him for anything.”