Gilson is available for hire
Hire GilsonGilson Marquato Júnior
Verified Expert in Engineering
Full-stack Developer
Porto, Portugal
Toptal member since November 1, 2021
Bio
Gilson is a skilled software developer experienced in software development, automation, continuous integration, modular code and services, software with internationalization, debugging, and virtualization. He has knowledge and experience working with mobile, desktop, web, server, and IoT devices. Gilson has been using the Scrum methodology for over seven years and is keen on design patterns like MVC.
Portfolio
Toptal Client
Software Engineering, Artificial Intelligence (AI)...
Benaforma, Inc.
React Native, React, TypeScript, Node.js, REST APIs, Expo, Firebase, AWS Lambda...
Nevoya Inc.
React, TypeScript, Python, Material UI, Tailwind CSS, Test Automation...
Experience
- Node.js - 10 years
- React - 10 years
- TypeScript - 10 years
- Unreal Engine - 6 years
- React Native - 6 years
- Game Development - 6 years
- Test Automation - 5 years
- Fastlane - 4 years
Work Experience
AI Benchmark Expert
2026 - 2026
Toptal Client
- Authored software-engineering benchmark tasks for frontier AI coding agents, after passing vetting in compilers and language tooling and systems, back end, and networking.
- Designed tasks on real open-source codebases (C++, Rust, Go, Python), including assimp, sqlglot, bb8, ttlcache and redb.
- Built hidden-test graders in which the reference fix scored 1.0, and the unmodified codebase scored 0.0, and verified both before every submission.
- Calibrated difficulty against frontier models. Ran quality checks on agent traces (prompt alignment, false-negative and false-positive analysis) and resolved every flagged issue before submission.
- Diagnosed and fixed failures in automated CI review on submitted pull requests, such as rate-limit errors, stale invalidated runs, and judge inconsistencies, until intake came back clean.
- Reviewed peer-submitted benchmark tasks in the program, checking prompts, hidden-test graders, judge criteria, and agent runs, then gave approval or requested changes and feedback on their pull requests.
- Automated the task workflow covering setup, gold/base validation, multi-model evaluation, and trace review with Python tooling and Docker-based environments.
Technologies: Software Engineering, Artificial Intelligence (AI), Large Language Models (LLMs), Python, Go, C, C++, Databases, PostgreSQL, SQLite, Rust, Assimp, Docker, Docker Compose, Bash, Bash Script, GitHub Actions, GitHub Workflows, Claude
Full-stack Developer
2025 - 2026
Benaforma, Inc.
- Rebuilt the app's interface end to end, creating a reusable component library and connecting every screen to the back end.
- Built the truck check-in flow where guards scan and validate driver's licenses, license plates, VINs, USDOT numbers, bills of lading, and vehicle registrations at the gate.
- Implemented cross-validation of data across check-in steps, flagging inconsistent documents to the guard before a truck was cleared.
- Made barcode scanning reliable on iOS by testing three scanner implementations and rolling out the best one across all steps.
- Moved form validation rules to the server, so they could change without shipping a new app release.
- Added emergency call and panic buttons to the app, and a guard security code across the mobile app and the admin portal.
- Enabled over-the-air updates so fixes reached users without app store releases, and compressed photos before upload to speed up submissions.
- Integrated SendGrid email notifications for account and password events on the Node.js and MongoDB back end, and refined validation rules for license plates, USDOT numbers, and state driver's licenses.
Technologies: React Native, React, TypeScript, Node.js, REST APIs, Expo, Firebase, AWS Lambda, SendGrid, MongoDB, Amazon Web Services (AWS), iOS, App Store Acceptance Process, App Store, API Architecture, Component-based Architecture, Claude, Tailwind UI
Full-stack Developer
2025 - 2026
Nevoya Inc.
- Led the evolution of the map stack from Google Maps to Mapbox (react-map-gl), defining map component architecture, marker rendering, and route visualization for logistics operations.
- Built geofence visualization features across trailer, tracking, location detail, and shift replay maps, including early and consistent geofence visibility behavior and reusable map constants.
- Implemented advanced map UX for dispatch and tracking: marker clustering improvements, close-marker icon handling, map and table cross-highlighting, zoom guardrails, and multi-vehicle telemetry support.
- Delivered shift replay enhancements by embedding replay directly on map workflows, refining playback controls and state handling, and improving map interactions for selected legs and shifts.
- Integrated routing capabilities with HERE and flexpolyline and back-end routing APIs to improve route display and dispatch-related map behavior.
- Developed region-management capabilities (region APIs, reassignment endpoints, and summary schemas) and synchronized region tags with Samsara entities.
- Improved data quality and reliability in location pipelines with coordinate validation, invalid-location filtering, and fixes for map and navigation race conditions.
- Integrated external geospatial/address systems (Trimble Places and Samsara links and geofence flows), including back-end schema updates and front-end integration improvements.
- Shipped planning and dispatch UX improvements such as fleet filters, unscheduled-legs interactions, planned miles display, and Driver HOS visibility enhancements.
Technologies: React, TypeScript, Python, Material UI, Tailwind CSS, Test Automation, GitHub Actions, Graphite, Mapbox, Mapbox GL, Supabase, Supabase Auth, SQLAlchemy, PostgreSQL, HERE, HERE Maps API, Samsara, FastAPI, OAuth 2, AI Agents, Webhooks, Amazon Web Services (AWS), AI Integration, Third-party APIs, React Testing Library, APIs, Docker, System Architecture, Front-end, MUI CSS, Claude Code, Cursor AI, AI Tools, Third-party Integration, JavaScript, Architecture, Cloud, Software Architecture, Solution Architecture, Software System Architecture Development, Vercel, Full-stack, SQL, API Integration, REST APIs, GitHub, Figma, Google Maps API, Artificial Intelligence (AI), Agentic AI, Technical Leadership, Performance, React Query, Data Pipelines, AI Copilots, Agentic RAG Systems, Large Language Model Operations (LLMOps), Testing, Prompt Engineering, Client Communication, Troubleshooting, Agentic AI Systems, Event-driven Architecture, Event-driven Systems, Refactoring, Performance Optimization, Code Review, Distributed Systems, Migration, Runtime Debugging, Source Code Parsing, User Authentication, Debugging, AI Development, API Architecture, Component-based Architecture, Claude, Shadcn UI, Tailwind UI
Full-stack Developer
2025 - 2025
GSI Technologies LLC
- Created an authentication system with role management using AWS Cognito and third-party identity providers.
- Integrated the app with Plaid to synchronize bank transactions into the app, using webhooks and Python lambda scripts.
- Implemented a tool to export a selection of data to CSV and Excel file formats.
Technologies: React, Next.js, Node.js, JavaScript, Large Language Models (LLMs), Stripe API, Plaid API, Amazon Web Services (AWS), Machine Learning, Python, Fastify, Amazon Cognito, OAuth 2, Webhooks, Payment Processing, ACH Payments, AI Integration, Third-party APIs, Plaid, APIs, System Architecture, Front-end, MUI CSS, Claude Code, AI Tools, Third-party Integration, Architecture, Cloud, Software Architecture, Fintech, Startups, Solution Architecture, SOC 2, Software System Architecture Development, Vercel, Terraform, Full-stack, SQL, API Integration, REST APIs, Figma, Stripe Connect API, Stripe Connect, Performance, React Query, Data Pipelines, Artificial Intelligence (AI), AI Copilots, Agentic RAG Systems, Testing, Prompt Engineering, Client Communication, Troubleshooting, GitHub Actions, Agentic AI Systems, Event-driven Architecture, Event-driven Systems, Performance Optimization, Code Review, Distributed Systems, Runtime Debugging, Source Code Parsing, User Authentication, Debugging, AI Development, Cloud Storage, Data Analysis.Financial Data, API Architecture, Component-based Architecture, Claude, Shadcn UI
Mobile Developer (React Native)
2024 - 2025
Parasite ID, Corp.
- Built a React Native/Expo mobile app used by about 50 researchers at a university in the Philippines to detect and count parasite eggs in sample images with on-device TensorFlow models.
- Automated parasite egg counting, saving researchers time analyzing samples and producing reliable results in the vast majority of cases.
- Built a prediction-editing workflow that let users correct, remove, and manually add eggs the model missed, so final counts stayed accurate.
- Created a results screen with sorting and CSV export, so researchers could review results and share them outside the app.
- Improved the reliability of the detection model by upgrading the TensorFlow library and testing different image preprocessing methods.
- Redesigned the capture-to-save flow so users could no longer skip the sample ID, and added input validation to prevent data-entry errors.
- Improved the user experience by speeding up how detection results render on screen and keeping the device awake during long analyses.
Technologies: React Native, Android, SQLite, Git, Expo, Machine Learning, Java, Amazon Web Services (AWS), Large Language Models (LLMs), TensorFlow, Component-based Architecture, Claude
Unreal Engine Developer
2024 - 2025
Haywire Interactive LLC
- Created a large-scale tactical shooter and strategy FPS/RTS game using Unreal Engine with C++ and some Blueprints.
- Developed AI using state trees, environment query, and C++.
- Created automation on GitHub to automatically run tests, linters, and validations on PR.
Technologies: C++, Unreal Engine, ECS, Automated Testing, Multiplayer, Windows PowerShell, GitHub Actions, Unreal Motion Graphics UI Designer (UMG), Game Development, C, Early-stage Startups, Game Design, Gaming, Online Gaming, AI Integration, Third-party APIs, Software Architecture, Software System Architecture Development, Performance, Artificial Intelligence (AI), AI Copilots, Agentic RAG Systems, Testing, Prompt Engineering, Client Communication, Troubleshooting, Agentic AI Systems, Game AI, Refactoring, Performance Optimization, Code Review, Migration, Optimization, Memory Management, LLVM, Clang, GCC, Runtime Debugging, Source Code Parsing, Graphics, Debugging, Graphics Processing Unit (GPU), Multithreading, AI Development, Claude
Full-stack Developer
2024 - 2024
Tethernet AI
- Architected some automations using Selenium to scrape relevant data from the web and organize and store the results on the database.
- Developed a Chrome extension to extend the functionalities of a webpage, rendering custom views inside it.
- Created a dashboard tool's front and back end with charts, tables, and filters using Next.js, NestJS, AWS, MongoDB, and WebSockets.
Technologies: React, TypeScript, Node.js, JavaScript, Docker, Next.js, Selenium, NestJS, GitHub, MongoDB, Chrome Extensions, Web Scraping, Vercel, AWS IAM, Amazon Elastic Container Service (ECS), Amazon CloudWatch, AWS Lambda, WebSockets, Socket.IO, Automation, Software Development, RESTFul APIs, Data Analytics, Early-stage Startups, Web Extensions, OAuth 2, AI Integration, Third-party APIs, APIs, System Architecture, Front-end, Third-party Integration, Architecture, Cloud, Software Architecture, Startups, Solution Architecture, Software System Architecture Development, Full-stack, API Integration, REST APIs, Figma, Stripe Connect, Performance, React Query, NoSQL, Data Pipelines, Testing, Client Communication, Troubleshooting, GitHub Actions, Code Review, Distributed Systems, Runtime Debugging, Source Code Parsing, User Authentication, Subscriptions, Debugging, AI Development, Cloud Storage, Component-based Architecture
Unreal Engine Developer
2023 - 2024
Electoine LLC
- Helped create a multiplayer game on Unreal Engine 5 for HoloLens. Worked on the game mode logic and the management of the game and players' state.
- Created the communication between the game and ESP32 devices through MQTT.
- Developed a multithread ESP32 C++ code using FreeRTOS to interact with the game, using modules like SD Card, I2S audio amplifier, and IR transmitter and receiver.
Technologies: Unreal Engine, C++, Microsoft Visual Studio, ESP32, Mosquitto, MQTT, Microcontrollers, FreeRTOS, HoloLens, Internet of Things (IoT), APIs, Startups, Software Design, Game Production, Augmented Reality (AR), Virtual Reality (VR), Minimum Viable Product (MVP), Unreal Engine 5, Blueprint, User Interface (UI), User Experience (UX), 3D Games, Architecture, Embedded C++, Embedded C, Embedded Systems, Embedded Hardware, Embedded Software, JSON REST APIs, Online Games, UI Development, GitHub, Software Development, Game Development, Firmware, Solution Architecture, Data Analytics, C, MCU, Early-stage Startups, Game Design, Gaming, Online Gaming, Third-party APIs, System Architecture, Software Architecture, Software System Architecture Development, Client Communication, Troubleshooting, Refactoring, Network Engineering, Network Protocols, Performance Optimization, Code Review, Migration, TCP/IP, Optimization, Memory Management, LLVM, Clang, GCC, Runtime Debugging, Source Code Parsing, Graphics, Debugging, Graphics Processing Unit (GPU), Multithreading
Full-stack Engineer
2023 - 2023
Ironhack US LLC
- Improved the SEO of the company website by re-modeling how URLs handle combinations of different regions and languages.
- Enhanced the SEO of the company website by creating a root page with links to all possible home pages with the combination of available regions and languages.
- Boosted the SEO of the company website by configuring what pages should and shouldn't be indexed by robots.
- Refined the SEO of the company website by doing correct redirections of pages that changed the URL and pages that will change the URL.
Technologies: JavaScript, Search Engine Optimization (SEO), SEO Tools, SEO Content, SEO Testing, GitFlow, React, Node.js, Git, Next.js, Cloudflare, DatoCMS, TypeScript, Lint, NPM, Private NPM Modules, GraphQL, A/B Testing, Architecture, Responsive Web Apps, JSON REST APIs, UI Development, GitHub, Software Development, Internationalization, Localization, RESTFul APIs, Headless CMS, Solution Architecture, OAuth 2, Third-party APIs, APIs, Front-end, eCommerce, Third-party Integration, Cloud, Software Architecture, Mobile First, Software System Architecture Development, Full-stack, SQL, Performance, React Query, Testing, Troubleshooting, GitHub Actions, Vite, Refactoring, Performance Optimization, Code Review, Distributed Systems, Migration, Runtime Debugging, Source Code Parsing, User Authentication, Debugging, Component-based Architecture, Tailwind UI
Unreal Engine Developer
2023 - 2023
Huaqiang Zhang
- Created the communication between the Unreal Engine project and AWS back end, sending metrics about the player and session.
- Improved the project's overall Unreal Engine Pixel Streaming performance and enabled multiple users to connect to Pixel Streaming.
- Created a custom load balancer on AWS from scratch to handle features the ELB doesn't have. This load balancer creates and terminates EC2 instances based on custom rules.
- Built an app and website using React Native, React Native for Web, TypeScript, and AWS Amplify.
Technologies: C++, Unreal Engine, Unreal Engine 4, Amazon Web Services (AWS), JavaScript, Amazon EC2, Amazon Route 53, Load Balancers, AWS Lambda, Amazon DynamoDB, AWS AppSync, AWS Amplify, React Native, React Native for Web, TypeScript, Expo, Amazon Cognito, Amazon S3 (AWS S3), APIs, REST APIs, Full-stack, Startups, Software Design, Amazon API Gateway, Front-end Architecture, Front-end Development, Game Production, Minimum Viable Product (MVP), Unreal Engine 5, Blueprint, WebRTC, User Interface (UI), User Experience (UX), React Navigation, Expo.io, DB, GraphQL, Mobile Game Development, Cloud Platforms, Stripe, 3D Games, Architecture, Responsive Web Apps, JSON REST APIs, Stripe API, UI Development, SaaS, Animation, Amazon CloudWatch, GitHub, Payment Gateways, Payment APIs, Automation, Software Development, Game Development, Linux, RESTFul APIs, Solution Architecture, Data Analytics, Apps, Early-stage Startups, OAuth 2, Game Design, Gaming, EAS, Webhooks, Payment Processing, ACH Payments, Third-party APIs, System Architecture, Front-end, Third-party Integration, Cloud, Software Architecture, Software System Architecture Development, API Integration, Stripe Connect API, Stripe Connect, Performance, Testing, Client Communication, Troubleshooting, DNS, GitHub Actions, Cross-platform App Development, Firebase, Firebase Authentication, Network Engineering, Network Protocols, Performance Optimization, Code Review, Distributed Systems, TCP/IP, Optimization, Memory Management, Runtime Debugging, Source Code Parsing, User Authentication, Subscriptions, Video Streaming, Graphics, Debugging, Graphics Processing Unit (GPU), Multithreading, API Architecture, Component-based Architecture
Senior Front-end Developer
2022 - 2022
Personio
- Worked on a design system developing React components complying with some A11y standards and styles that can be customized.
- Managed release on npm registry of design system complying with server semantic versioning standard.
- Acted as the primary point of contact for developers with questions and doubts about the design system.
Technologies: React, TypeScript, Front-end, SCSS, Storybook, Lerna, GitLab CI/CD, Atomic Design, Design Systems, Integration, Scrum, NPM, DevOps, Docker, Jest, Unit Testing, Responsive UI, API Hooking, TypeScript 3, Algorithms, Responsive Layout, Monorepos, GitFlow, GitLab, Networking, UI Libraries, UI Components, Component Libraries, Front-end Architecture, Front-end Development, User Interface (UI), User Experience (UX), JavaScript Testing, Mobile First, Cloud Platforms, UI Development, SaaS, Software Development, OAuth 2, React Testing Library, Enterprise Systems, JavaScript, Testing, Troubleshooting, GitHub Actions, Vite, Code Review, Runtime Debugging, Source Code Parsing, Debugging, Open Source, Component-based Architecture, Shadcn UI
Front-end Web Developer
2021 - 2022
Hum Nutrition, Inc.
- Developed an eCommerce website to manage and sell subscriptions to users with high SEO capabilities and some E2E test cases.
- Developed a retail eCommerce website with high SEO capabilities.
- Solved product issues and bugs raised by the QA team.
Technologies: React, CSS, SCSS, HTML, Vue, Tailwind CSS, Astro, Cypress, Responsive Web Apps, REST APIs, Application State Management, JavaScript, Agile, API Integration, Next.js, APIs, HTML5, Authentication, TypeScript, Web Development, Design Patterns, Software Design Patterns, CSS Grid, GitHub, Single-page Applications (SPAs), Google Analytics, Search Engine Optimization (SEO), eCommerce, Online Ordering, JSON, HTTP, Scripting, Analytics, Integration, REST, NPM, Content Management Systems (CMS), Responsive UI, API Hooking, TypeScript 3, Algorithms, Responsive Layout, GitFlow, Networking, Software Design, Headless Commerce, Front-end Architecture, Front-end Development, User Interface (UI), User Experience (UX), Mobile First, Cloud Platforms, SEO Content, SEO Tools, Architecture, Retail & Wholesale, JSON REST APIs, UI Development, Animation, Software Development, RESTFul APIs, Headless CMS, Solution Architecture, Data Analytics, OAuth 2, Third-party APIs, Front-end, Third-party Integration, Figma, Performance, Testing, Troubleshooting, GitHub Actions, Vite, Refactoring, Performance Optimization, Code Review, Migration, Runtime Debugging, Source Code Parsing, User Authentication, Debugging, Component-based Architecture
Senior Full-stack Developer
2021 - 2021
Compass Group
- Developed an app for Android and iOS using React Native for customers that want to make table reservations or buy for takeaway.
- Created a back-office app so that the restaurant managers can control the aspects of the app like marketing communications, control of food stock, and the configuration of some parameters for each restaurant.
- Built a back end based on microservices using TypeScript, Node.js, GraphQL, and REST.
Technologies: React Native, React, Node.js, TypeScript, TypeORM, Redux, HTML, Styled-components, REST, GraphQL, Git, JavaScript, Back-end, App Development, Apollo, CSS, Front-end, Mobile, Mobile App Development, Mobile Development, Async/Await, ECMAScript (ES6), PostgreSQL, REST APIs, Application State Management, Agile, Jest, API Integration, Next.js, APIs, HTML5, Authentication, React Redux, Web Development, Back-end Development, Design Patterns, Software Design Patterns, Web MVC, Jira, Full-stack, React Native for Web, Single-page Applications (SPAs), Mobile Apps, Google Analytics, Full-stack Development, Large-scale Projects, Serverless, Online Ordering, JSON, HTTP, Scripting, Analytics, Integration, Scrum, NPM, Unit Testing, Responsive UI, API Hooking, API Development, TypeScript 3, MERN Stack, Algorithms, Responsive Layout, GitFlow, GitLab, Amazon Web Services (AWS), AWS Lambda, Serverless Architecture, Networking, Front-end Architecture, Front-end Development, User Interface (UI), User Experience (UX), React Navigation, DB, JavaScript Testing, Mobile First, Cloud Platforms, Mobile App UI, Responsive Web Apps, Express.js, JSON REST APIs, UI Development, SaaS, GitHub, Software Development, Internationalization, Localization, RESTFul APIs, Data Analytics, Apps, OAuth 2, TestFlight, i18next, Third-party APIs, React Testing Library, System Architecture, Enterprise Systems, Third-party Integration, Cloud, Software Architecture, Software System Architecture Development, Mobile Architecture, Performance, React Query, Push Notifications, Testing, Troubleshooting, GitHub Actions, Cross-platform App Development, Refactoring, Performance Optimization, Code Review, Distributed Systems, Migration, Runtime Debugging, Source Code Parsing, User Authentication, Debugging, API Architecture, Component-based Architecture
Senior Front-end Developer
2021 - 2021
Hitachi Vantara
- Created a web interface that allows users to create ad campaigns for their products and services aiming at the desired audience, with predictions and reports.
- Tracked and fixed bugs using Jira as a reporting tool.
- Moved standard UI components to a component library to be reused in all the company's apps.
Technologies: TypeScript, Cypress, Redux, REST, HTML, CSS, Git, JavaScript, React, Front-end, Async/Await, ECMAScript (ES6), Apollo Server, Responsive Web Apps, REST APIs, Application State Management, Webpack, Agile, Jest, API Integration, Next.js, APIs, HTML5, Authentication, React Redux, Web Development, Design Patterns, Software Design Patterns, Jira, CSS Grid, Single-page Applications (SPAs), Google Analytics, Figma, Large-scale Projects, Online Ordering, JSON, HTTP, Scripting, Analytics, Integration, Scrum, NPM, Unit Testing, Responsive UI, API Hooking, TypeScript 3, Dashboard Design, Data Visualization, Dashboards, Algorithms, Responsive Layout, GitFlow, GitLab, Networking, UI Libraries, UI Components, Component Libraries, Storybook, User Interface (UI), User Experience (UX), Dashboard Development, JavaScript Testing, Mobile First, Cloud Platforms, JSON REST APIs, UI Development, SaaS, GitHub, Software Development, Internationalization, Localization, RESTFul APIs, OAuth 2, Third-party APIs, React Testing Library, Enterprise Systems, Third-party Integration, Cloud, Software Architecture, Software System Architecture Development, Performance, React Query, Testing, Troubleshooting, Infrastructure, Performance Optimization, Code Review, Distributed Systems, Runtime Debugging, Source Code Parsing, User Authentication, Debugging, API Architecture, Component-based Architecture, Tailwind UI
Senior Front-end Developer
2018 - 2021
Mindera
- Developed a cryptocurrency platform for users that want to borrow, lend, transfer, and invest money through a mobile app or website. I also created native modules for React Native using the platform's native language.
- Worked on an app migration from React to React Native for a horse race gambling platform.
- Architected and estimated a new application for a potential client.
- Created pipelines for the mobile apps that automate building, unit testing, and releasing on each platform store using Fastlane and Ruby.
Technologies: React Native, Swift, Objective-C, Java, Fastlane, Ruby, Context API, Redux, Flow, HTML, Sass, Styled-components, REST, GraphQL, React, TypeScript, Groovy, Firebase, Git, JavaScript, Blockchain & Cryptocurrency, App Development, Apollo, CSS, SCSS, Front-end, Mobile, Mobile App Development, Mobile Development, Async/Await, ECMAScript (ES6), Google Cloud Platform (GCP), Apollo Server, Responsive Web Apps, REST APIs, Application State Management, Webpack, Agile, Jest, API Integration, Next.js, Architecture, APIs, HTML5, Authentication, Android, iOS, React Redux, Cloud, Continuous Deployment, Web Development, CI/CD Pipelines, Technical Leadership, Twilio API, Continuous Delivery (CD), Continuous Integration (CI), Build Automation, Software Architecture, Design Patterns, Software Design Patterns, Jira, Team Leadership, CSS Grid, Management, React Native for Web, Single-page Applications (SPAs), Mobile Apps, Google Analytics, Figma, Large-scale Projects, Leadership, Progressive Web Applications (PWAs), Search Engine Optimization (SEO), Online Ordering, Cryptocurrency, JSON, HTTP, Scripting, Analytics, iOS Camera, Android Camera App, Geolocation, Blockchain, Integration, Cryptocurrency Wallets, Scrum, Lerna, NPM, DevOps, Docker, Responsive UI, API Hooking, TypeScript 3, Babylon.js, Twilio, Games, Dashboard Design, Finance, Fintech, Google Cloud, Algorithms, D3.js, Responsive Layout, Monorepos, GitFlow, Serverless Architecture, Networking, Startups, Software Design, UI Libraries, UI Components, Component Libraries, Front-end Architecture, Front-end Development, Minimum Viable Product (MVP), Storybook, User Interface (UI), User Experience (UX), React Navigation, JavaScript Testing, Cloud Platforms, SEO Content, Mobile App UI, Test-driven Development (TDD), A/B Testing, JSON REST APIs, SVG, UI Development, Animation, GitHub, Automation, Software Development, Internationalization, Localization, Linux, RESTFul APIs, Solution Architecture, Kubernetes, Data Analytics, Apps, Video Streaming, Streaming, Early-stage Startups, OAuth 2, Casinos & Gaming, EAS, TestFlight, i18next, Webhooks, Third-party APIs, React Testing Library, System Architecture, Third-party Integration, Software System Architecture Development, SQL, Videos, Mobile Architecture, Performance, React Query, Push Notifications, SMS, Web3, Testing, Troubleshooting, Infrastructure, GitHub Actions, Cross-platform App Development, Financial Services, Trading, Event-driven Architecture, Event-driven Systems, Firebase Authentication, Refactoring, Performance Optimization, Code Review, Distributed Systems, Migration, Runtime Debugging, Source Code Parsing, User Authentication, App Store Acceptance Process, Video Players, Debugging, Open Source, Cloud Storage, Data Analysis.Financial Data, Investment & Trading Advisory.Stock Trading, App Store, Component-based Architecture, Jenkins, Tailwind UI
Senior Full-stack Developer
2014 - 2018
Priori Tecnologia da Informação
- Created a mobile app to improve the decision-making speed of the finance manager by sending a push notification to his phone. I also created the back end with a dynamic dashboard that can be customized by the customer.
- Developed a mobile app for the sales representative to sell products without an internet connection. This app synchronizes data when the internet connection is available. I also worked on the back end with REST API.
- Built pipelines for the mobile apps that automate the build and release on each platform store using Fastlane and Ruby.
Technologies: React Native, TypeScript, Firebase, Delphi, Firebird, SQL, JavaScript, Back-end, App Development, React, CSS, Front-end, Mobile, Mobile App Development, Mobile Development, Async/Await, ECMAScript (ES6), REST APIs, Application State Management, HTML, Agile, API Integration, Architecture, APIs, HTML5, Authentication, Continuous Deployment, CI/CD Pipelines, Technical Leadership, Back-end Development, Continuous Delivery (CD), Continuous Integration (CI), Build Automation, Software Architecture, Design Patterns, Software Design Patterns, Web MVC, Team Leadership, Full-stack, Management, Single-page Applications (SPAs), Mobile Apps, Full-stack Development, Leadership, JSON, HTTP, Scripting, Geolocation, Integration, Scrum, REST, NPM, DevOps, Responsive UI, API Hooking, API Development, TypeScript 3, Data Visualization, Dashboards, Algorithms, Responsive Layout, GitFlow, Networking, Software Design, Front-end Architecture, Front-end Development, Minimum Viable Product (MVP), User Interface (UI), User Experience (UX), DB, Dashboard Development, Cloud Platforms, Mobile App UI, QR Codes, Responsive Web Apps, JSON REST APIs, UI Development, SaaS, Animation, Automation, Software Development, SQLite, RESTFul APIs, Solution Architecture, Customer Relationship Management (CRM), Bootstrap, Data Analytics, Apps, TestFlight, Third-party APIs, System Architecture, MUI CSS, Enterprise Systems, Third-party Integration, Groovy, Cloud, Software System Architecture Development, Offline Data Synchronization, Angular, Mobile Architecture, Performance, Data Pipelines, GPS, Push Notifications, CRM, Customer Support, Troubleshooting, Infrastructure, Cross-platform App Development, Event-driven Architecture, Event-driven Systems, Firebase Authentication, Refactoring, Performance Optimization, Code Review, Migration, Operating Systems, Runtime Debugging, Source Code Parsing, User Authentication, App Store Acceptance Process, Debugging, Multithreading, iOS, App Store, API Architecture, Component-based Architecture, Jenkins
Project History
Cryptocurrency Platform
A React Native-based app for a cryptocurrency platform that allows users to borrow, lend, transfer, and invest money.
I was the front-end developer and had the opportunity to integrate this project from the start, make decisions for the app architecture, and work on it until the public release of the first version in the stores. I wrote native modules for React Native using Java and Swift to integrate the app and a KYC provider. I created the pipeline automation using Fastlane and Ruby scripts to build, execute the automated tests, and publish it on each platform store.
I was the front-end developer and had the opportunity to integrate this project from the start, make decisions for the app architecture, and work on it until the public release of the first version in the stores. I wrote native modules for React Native using Java and Swift to integrate the app and a KYC provider. I created the pipeline automation using Fastlane and Ruby scripts to build, execute the automated tests, and publish it on each platform store.
Cryptocurrency Price Alert Telegram Bot
https://github.com/gilsonmandalogo/crypto-alert-telegram-botA TypeScript based Telegram bot that accesses API from exchanges to watch the price change and trigger custom alerts according to the user's configuration. It uses Firebase functions as microservice back-end and Firestore as a database to store users' preferences.
Web App to Native App Migration
I helped migrate a horse racing gambling platform with more than 13,000 ratings on the App Store from React to React Native (web to mobile). I designed the app architecture in an iterative migration process. This migration had a critical delivery timeline.
Education
2012 - 2015
University Degree in Information Technology Management
Senac - Jaraguá do Sul - SC, Brazil
Certifications
JULY 2023 - PRESENT
Unreal Engine 5 C++ Developer: Learn C++ & Make Video Games
Udemy
OCTOBER 2022 - PRESENT
Three.js and TypeScript
Udemy
APRIL 2020 - PRESENT
Character Animation with Blender
Udemy
MARCH 2018 - PRESENT
Node.js and MongoDB Developer Complete Training
Udemy
DECEMBER 2017 - PRESENT
Multiplatform Android/iOS Developer with React and Redux
Udemy
JUNE 2011 - PRESENT
Java EE and Java SE Developer with Firebird SQL and MVC Pattern
Senac
Skills
Libraries/APIs
React, Node.js, REST APIs, Stripe API, React Testing Library, Google Maps API, Stripe Connect API, Stripe Connect, React Query, Context API, React Navigation, Vue, React Native for Web, WebGL, Telegram Bot API, API Development, Stripe, Telegram Messenger API, Google API, Pandas, React Redux, Twilio API, Socket.IO, Babylon.js, Chart.js, D3.js, AWS Amplify, WebRTC, Three.js, Plaid API, Mapbox GL, SQLAlchemy, HERE Maps API, Assimp, TensorFlow
Tools
Git, Webpack, GitHub, Figma, NPM, GitLab, Expo, Expo.io, JavaScript Testing, Amazon CloudWatch, Amazon Elastic Container Service (ECS), TestFlight, Plaid, Claude Code, Firebase Authentication, GCC, Jenkins, Claude, Shadcn UI, Fastlane, Jira, Amazon Cognito, Telegraf, Terraform, Blender, Flow, Astro, Google Analytics, NGINX, Lerna, GitLab CI/CD, Microsoft Visual Studio, AWS AppSync, MQTT, HoloLens, Google Sheets, AWS IAM, Unreal Motion Graphics UI Designer (UMG), HERE, Docker Compose, SendGrid
Languages
TypeScript, GraphQL, SQL, HTML, CSS, Groovy, JavaScript, ECMAScript (ES6), HTML5, Python, TypeScript 3, C++, C, Java, Ruby, SCSS, Embedded C++, Embedded C, Swift, Objective-C, Sass, Delphi, C#, Go, Rust, Bash, Bash Script
Frameworks
React Native, Cypress, Jest, Next.js, Unreal Engine, MUI CSS, Unreal Engine 4, Blueprint, NestJS, OAuth 2, i18next, Express.js, Tailwind CSS, Angular, Redux, Material UI, Ant Design, Unity, Unity3D, Selenium, Windows PowerShell, Bootstrap, Fastify
Paradigms
Test Automation, REST, App Development, Mobile Development, Unit Testing, Responsive Layout, Automation, Testing, Event-driven Architecture, Refactoring, API Architecture, Microservices, Agile, Continuous Deployment, Continuous Delivery (CD), Continuous Integration (CI), Design Patterns, Search Engine Optimization (SEO), Scrum, DevOps, Serverless Architecture, ITIL, Management, Low-code Development, Test-driven Development (TDD), Automated Testing
Platforms
Firebase, Mobile, Android, iOS, Docker, Amazon Web Services (AWS), Vercel, Visual Studio Code (VS Code), Google Cloud Platform (GCP), Raspberry Pi, Software Design Patterns, Blockchain, AWS Lambda, Amazon EC2, Embedded Linux, Linux, Kubernetes, MacOS, Twilio, DatoCMS, Mapbox
Storage
MongoDB, JSON, NoSQL, Data Pipelines, PostgreSQL, Amazon DynamoDB, Databases, DB, SQLite, Firebird, Cloud Firestore, Google Cloud, Amazon S3 (AWS S3), MySQL
Industry Expertise
Retail & Wholesale
Other
Async/Await, Styled-components, Back-end, Front-end, Mobile App Development, API Integration, Responsive Web Apps, Architecture, APIs, Cloud, Web Development, Software Architecture, Full-stack, Game Development, Single-page Applications (SPAs), Mobile Apps, Full-stack Development, Progressive Web Applications (PWAs), eCommerce, HTTP, Scripting, Storybook, Integration, Responsive UI, API Hooking, MERN Stack, Games, Fintech, Algorithms, GitFlow, Networking, Startups, UI Libraries, UI Components, Component Libraries, Front-end Architecture, Front-end Development, Minimum Viable Product (MVP), Unreal Engine 5, User Interface (UI), User Experience (UX), Mobile First, Cloud Platforms, Mobile App UI, Game AI, 3D Games, JSON REST APIs, Online Games, UI Development, SaaS, Animation, Payment Gateways, Artificial Intelligence (AI), Software Development, Internationalization, Localization, GitHub Actions, RESTFul APIs, Solution Architecture, Data Analytics, Apps, Early-stage Startups, Large Language Models (LLMs), FastAPI, AI Agents, Casinos & Gaming, Game Design, Gaming, Online Gaming, EAS, Webhooks, Payment Processing, ACH Payments, AI Integration, Third-party APIs, System Architecture, Cursor AI, AI Tools, Enterprise Systems, Third-party Integration, Software System Architecture Development, Offline Data Synchronization, Agentic AI, Mobile Architecture, Performance, Push Notifications, SMS, AI Copilots, Agentic RAG Systems, Large Language Model Operations (LLMOps), Prompt Engineering, Client Communication, Troubleshooting, DNS, Infrastructure, Cross-platform App Development, Financial Services, Trading, Agentic AI Systems, Event-driven Systems, Vite, Network Engineering, Network Protocols, Performance Optimization, Code Review, Distributed Systems, Migration, Operating Systems, TCP/IP, Optimization, Memory Management, LLVM, Clang, Runtime Debugging, Source Code Parsing, User Authentication, Subscriptions, App Store Acceptance Process, Graphics, Debugging, Open Source, Multithreading, AI Development, Cloud Storage, Data Analysis.Financial Data, App Store, Component-based Architecture, Tailwind UI, TypeORM, 3D, Apollo, Telegram Bots, Apollo Server, Application State Management, Authentication, CI/CD Pipelines, Technical Leadership, Back-end Development, Build Automation, CSS Grid, Large-scale Projects, Online Ordering, Cryptocurrency, Analytics, iOS Camera, Android Camera App, Design Systems, Dashboard Design, Data Visualization, Dashboards, Video Players, Monorepos, Internet of Things (IoT), Software Design, Amazon API Gateway, Game Production, Dashboard Development, SEO Content, SEO Tools, A/B Testing, Embedded Systems, Embedded Hardware, Embedded Software, SVG, Chrome Extensions, Payment APIs, Chatbots, Firmware, Headless CMS, Customer Relationship Management (CRM), MCU, Video Streaming, Streaming, Web Extensions, Supabase, Videos, GPS, Web3, CRM, Customer Support, Machine Learning Operations (MLOps), LLM Integration, AI Agent Orchestration, Retrieval-augmented Generation (RAG), Graphics Processing Unit (GPU), Investment & Trading Advisory.Stock Trading, IT Project Management, Programming, Human Resources (HR), Entrepreneurship, Web MVC, Character Animation, Blockchain & Cryptocurrency, Firebase Cloud Functions, React Native Bridge, Atomic Design, Team Leadership, Leadership, Web Scraping, Serverless, Cannon.js, WebSockets, Geolocation, Cryptocurrency Wallets, Data Scraping, Material Design, Content Management Systems (CMS), 3D Graphics, Finance, ESP32, Multiplayer, Amazon Route 53, Load Balancers, Mosquitto, Microcontrollers, FreeRTOS, 3D Animation, Headless Commerce, Augmented Reality (AR), Virtual Reality (VR), Autodesk Maya, Mobile Game Development, QR Codes, Blueprints Visual Scripting, SEO Testing, Cloudflare, Lint, Private NPM Modules, Machine Learning, ECS, Image Processing, Graphite, Supabase Auth, Samsara, SOC 2, Software Engineering, GitHub Workflows
Collaboration That Works
How to Work with Toptal
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1
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Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
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