Pedro Esmerio
Full-Stack Developer with 6 years of experience — specializing in React Native, .NET C# and Next.js. 18+ mobile apps in agribusiness (GAtec/Senior Agro) + own SaaS and fintech projects.
{ 2020 – 2026 · GAtec / Senior Agro }
# About
Highlights from my professional career, personal projects, and freelance work.
Full-Stack Developer specializing in React Native, .NET C# and Next.js
18+ mobile apps developed for agribusiness (GAtec / Senior Agro)
Founder and sole dev of CashbackNet — multi-tenant SaaS (NestJS + React + Expo)
Creator of Frugi — finance management app with receipt capture (Expo SDK 54 + Next.js 16)
Real-time WMS implementation with SignalR (Dashboard + Transfer + Processing)
9 freelance projects delivered (Merecido Docinho, SuperOhm, ODL)
Clean Architecture + CQRS + DDD in CashbackNet API (NestJS, Prisma, PostgreSQL, Docker)
AI Best Practices configuration (GitHub Copilot) for development teams
Segment Segregation in Operis WMS (65 new files, 179 edited)
55+ public repositories on GitHub since 2020
Full Google Play Store publishing management — listing, IAP, AdMob, and policies
Direct technical support to clients such as Santa Isabel, Balbo, Pitangueiras, and Viterra
Full stack: React, Next.js, Expo, Node.js, NestJS, .NET C#, Prisma, PostgreSQL, Docker
# Experience
My professional evolution from 2019 to today.
Full-stack Developer | UX/UI Design
Nível A Treinamentos
Prototype development, SEO-optimized Landing Pages (Next.js/Vercel) and external API integration in CRM systems.
- SEO-optimized Landing Page development using Next.js with Vercel deployment
- External API integration in management systems (CRM) using Axios and Fetch API
- Deployment and maintenance on the client's AWS infrastructure
Student & Developer
Superohm Equipamentos Científicos
Intensive participation in bootcamps and community events — NLW, Ignite, Alura Immersion.
- NLW Heat — full-stack in one week (front, back, mobile)
- Ignite Teams — 4 PRs merged via git flow (AsyncStorage)
- Move.it — Next.js app (gamified pomodoro)
- Open-source contribution to aluraquiz-base
Full-stack Developer
Rocketseat / Alura / b7web (Bootcamps & Cursos)
Corporate website redesign, custom dashboard development and VPS infrastructure.
- Complete redesign of legacy website and deployment on client's VPS server
- Custom dashboard development for lead acquisition metrics analysis
- Continuous integration with email marketing tools
- Delivery of 3 different website/LP versions following the company's growth phases
Freelance Developer
ODL Marketing Digital
Development of websites, landing pages, newsletters, and applications for various clients.
- SuperOhm — 3 versions of website/LP for the same client
- ODL — 4 deliveries: website, newsletter, LP, and Q&A app with Firebase
- Multiple technologies: HTML/CSS, JavaScript, Firebase
- 4 entregas principais: site corporativo, newsletter, LP e app Q&A com Firebase
Full-Stack Freelance Developer
Merecido Docinho (Freelance)
Full-stack delivery platform — web, API, landing page, desktop, and mobile.
- 5 repositories covering the entire project stack
- Next.js frontend with TypeScript
- Node.js/TypeScript API
- Desktop app with Electron
- Kyte Store integration on the landing page
Mobile React Native Developer (Junior/Mid-Level)
GAtec
First year at GAtec with intensive development of multiple React Native applications for agricultural and industrial management.
- GeneticImprovement app — Transplanting and Printing features
- CLTSantaMariaReactNative — complete app from infrastructure to production
- SimpleFarm.Mob.Shipping — agricultural shipping app created from scratch (infra + views + APK)
- AQPMobileReactNative — quality system with advanced validations and filters
- GAtecWorkbench — web translation and management tool with i18n
Mobile React Native Developer
GAtec
Development of new mobile modules (GRP, YMS) and merge/branch consolidation activities in legacy projects.
- View and component creation for GRPMobileReactNativeV2 (Work Order)
- New default Header implementation and SearchBar refactoring
- MIP branch merge into MASTER in GAtecMob (product consolidation)
- Initial OperisYMSMob setup — Yard Management System mobile
- Schema creation and YMS Mobile base structure
Mobile React Native Developer + .NET
GAtec / Senior Agro
Work on the OneClick project (Commercial Intelligence) for Viterra client and support for Operis Mobile with focus on checklist, processing, and critical bug resolution.
- OneClick Vequis project — improvements in the trading system for Viterra client
- Customer-Supplier pre-registration implementation with additional fields
- Operis Checklist — operational verification system
- Critical hotfix resolution (label blocking, digital signature, processing)
- Library upgrades with issues in mobile CheckList
Full-Stack Developer (Mobile + Backend)
GAtec / Senior Agro
Complete creation of Mobile Operis Varejo, implementation of inter-company transfer modules and real-time dashboard with SignalR.
- Created MobileOperisVarejo from scratch — complete WMS app for retail
- Inter-Company Transfer Module (mobile + backend with SignalR)
- Real-time dashboard with SignalR for WMS operations monitoring
- Real-time server communication creation (WebSocket hub architecture)
- SonarQube integration in Azure Pipelines for code analysis
Founder & Sole Developer
CashbackNet (Projeto Próprio)
Multi-tenant cashback SaaS startup conceived, designed, and developed entirely from scratch.
- Clean Architecture + CQRS + DDD — NestJS API with 4 layers and 90+ files
- React web panel with 12 pages (Dashboard, Cashback Management, Clients)
- Expo SDK 54 mobile app with Google Sign-In and i18n (pt-BR/en-US)
- Docker Compose: PostgreSQL, Redis, MailHog, MinIO (5 buckets)
- 17,765 lines added in the main commit
Senior Full-Stack Developer (Mobile + Backend)
GAtec / Senior Agro
Technical leadership in developing advanced features for Operis WMS, including segment segregation, mobile data compression, and AI Best Practices structuring for development teams.
- Segment Segregation feature in Operis WMS (PBI #903761) — full backend implementation: 65 new files, 179 edited
- Segment filters implemented in: Scale, Printer, Shipping/Seals, Production (ManufactureAuto), Distribution Center, Products
- User management with master profile restriction and ForbiddenRedirectFilter
- Mobile data compression/decompression system for traffic optimization
- Label maintenance after processing order replanning
Founder & Sole Developer
Frugi (Projeto Próprio)
Personal finance management app with receipt capture and internationalized landing page.
- Expo SDK 54 mobile app + React Native 0.81 + React Compiler
- Receipt capture via camera with image manipulation
- Full i18n (pt-BR/en-US) via i18next
- Next.js 16 landing page with SSR + Framer Motion + next-intl
- Validation with Zod 4 + native Google Sign-In
# Education
Academic background and courses that shaped my career.
Chemical Engineering
Methodist University of Piracicaba
HTML / CSS / Javascript / Node.js / Linux OS
B7web
UI Design with Figma
Udemy
Typescript ES6 / OOP
Rocketseat
React.js Fundamentals
Rocketseat
React Native Ignite Track
Rocketseat
C# .NET Track
Rocketseat
# Published & Developed Apps
Mobile applications I built professionally — from Figma prototype to Google Play Store publication.
Every app was prototyped in Figma before development — UX/UI design, navigation flows, and interface components.
Published on Google Play Store
Operis
Play StoreDesenvolvedor Mobile React Native (responsável principal)
Nov 2022 – Abr 2026 · Productivity
Complete finished product management platform for agribusiness. WMS with production control, storage, shipping, traceability, and quality management with full mobility.
Operis Varejo
Play StoreDesenvolvedor Mobile React Native
Ago 2025 – Abr 2026 · Business
Operis variant for retail operations — inter-company transfers, compression/decompression, ethanol loading, and real-time processing.
Enterprise & Internal Apps
SimpleFarm Shipping
Fev 2023 – Abr 2023 · Agriculture
Agricultural shipping app built entirely from scratch — from project infrastructure to views and APK generation.
Operis YMS
Ago 2024 – Mai 2025 · Logistics
Yard Management System mobile — yard management for agro-industrial logistics.
CLT Santa Maria
Dez 2022 – Abr 2023 · Agriculture
Sugarcane workforce management app — hour tracking, sound alerts, and shift logging.
AQP Mobile
Abr 2023 – Jul 2023 · Quality Control
Quality control (AQP) mobile system — advanced validations, filters, and database schemas.
GRP Mobile V2
Fev 2024 · Work Orders
Work order management (GRP) app v2 — Header, SearchBar, and Work Order views.
GeneticImprovement
Nov 2022 · Agriculture
Plant breeding app — Transplanting and Printing features for field variety control.
SimpleFarm Mobile
Out 2025 · Agriculture
SimpleFarm mobile platform — Gin module for cotton processing with bale stacking.
MPD Mobile
Abr 2023 · Agriculture
MPD module app — complete responsiveness refactor with 78 edits.
POV Mobile
Out 2023 · Agriculture
POV module app — icon setup and Checkbox components for field control.
PROMAN Mobile
Jul 2023 · Agriculture
PROMAN module app — base views for agro-industrial production management.
Central AQP
Jun – Jul 2023 · Quality Control
Central quality (AQP) app — Sidebar component and internationalization (i18n).
GAtec Workbench
2023 · Tools
Web translation and management tool with i18n for GAtec teams.
14 apps developed
# Featured Projects
Startups and personal projects I conceived, designed, and built from scratch as founder and sole developer.
CashbackNet
Fundador & Único Desenvolvedor
Multi-tenant SaaS cashback platform for restaurants and consumers. Startup conceived, designed, and fully developed from scratch — NestJS API with Clean Architecture, React admin panel, and Expo mobile app.
Tech Stack
Repositories
🏗 Clean Architecture + CQRS + DDD + Repository Pattern
Frugi
Fundador & Único Desenvolvedor
Personal finance management app with receipt capture via camera and internationalized landing page. Conceived, prototyped, and developed from scratch.
Tech Stack
# Projects
Projects I worked on within the GAtec / Senior Agro organization.
GAtec Mobile
Mobile React Native / Full-Stack Developer — responsible for multiple apps in the suite
GAtec Mobile Products Suite — mobile application platform for agricultural and industrial management. Includes applications for field data collection, production management, quality, maintenance, and more.
WMS (Warehouse Management System)
Full-Stack Developer (.NET + React Native) — responsible for Mobile Operis and WMS backend
Warehouse and logistics management system (Operis WMS). Includes web system (.NET) and mobile apps for receiving, storage, shipping, transfer, and processing of agricultural products.
SimpleFarm
Mobile React Native Developer — Shipping and Gin modules
Complete agricultural management system — includes shipping (Shipping), Gin (cotton processing), Commerce, Scouting modules, among others. Company's main project with robust backend and multiple mobile apps.
InteligenciaComercial (OneClick)
Full-Stack Developer — .NET MVC/C# web system
Commercial Intelligence system for commodity management — OneClick platform for agricultural trading operations (buying/selling grains, cotton, etc.). Used by clients such as Viterra.
Senior Agro Dev
Developer and active contributor across multiple towers (Tower A and Tower B)
Development management and governance project for Senior Agro — tracking all development activities, sprints, features, and support.
# Skills
Technologies and domains demonstrated in real projects.
Mobile Development
Backend Development
DevOps & CI/CD
AI & Developer Experience
Architecture & Patterns
Domain Knowledge
Frontend & Web
Backend & APIs (Personal Projects)
Mobile (Personal Projects)
Cloud & Store Publishing
Design & UX
Infrastructure & Containers
# Metrics
Professional (ADO) + personal (GitHub) contributions.
Start at the company — GeneticImprovement and CLTSantaMariaReactNative
Year of greatest diversity — 8 different repos, shipping, quality, and translation apps
Consolidation — GRP, branch merges, YMS Mobile setup (3 WMS User Stories)
Peak productivity — WMS Varejo, Transfer, Dashboard, OneClick Viterra
Technical leadership — AI Best Practices, Segment Segregation (65 new backend files), seal validation, Operis bugs, releases
repositories contributed
# Clients
Companies directly served during my career.
Santa Isabel
Sugar and ethanol mill
Viterra
Agricultural commodity trading
Balbo
Agro-industrial production
Pitangueiras
Sugar mill
Santa Maria (CLT)
Sugarcane workforce management
Merecido Docinho
Artisanal candy delivery
ODL Marketing Digital
Digital marketing and technology
Superohm Equipamentos Cientificos
Scientific equipment and technology
Nível A Treinamentos
Education and digital product launches
# Contact
Have an opportunity or want to chat? Send me a message.