William Silva

Software Engineer

I won't waste your time. Almost 4 years building solutions, from APIs and microservices to LLM agents with RAG in production with GCP or AWS. My core is TypeScript, Python, Go, and SQL, but if the project needs something new, I adapt fast. :)

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Experience

G
Grupo Aduaneiras - Cenofisco
Jun 2026 - Present
Mid-Level Software Engineer
I work on AI/RAG solutions for tax consulting, integrating APIs, workers, and human validation into critical flows. • Develop an AI/RAG agent with NestJS, TypeScript, OpenAI, and LangChain.js, generating context-aware answers from legal and tax sources. • Implement asynchronous processing with Redis and BullMQ, including workers, queues, source traceability, and metrics. • Integrate the agent with Extranet with human validation before client delivery and document APIs with Swagger/OpenAPI. • Lead bug fixing and performance optimization across APIs and workers, using Gitflow, Linux, and Docker.
T
TradeSee
Jan 2025 - Jun 2026
Full Stack Software Engineer
Mid-Level Full Stack Software Engineer I
Sep 2025 - Jun 2026
Junior III Full Stack Software Engineer
Jan 2025 - Sep 2025
Worked on a multitenant SaaS platform with TypeScript, NestJS, Next.js, GraphQL, PostgreSQL, and TypeORM, progressing internally from Junior III Full Stack Software Engineer to Mid-Level Software Engineer I. • Developed a real-time query chatbot for about 30 partner companies, integrating multiple databases and reducing manual searches from hours to seconds. • Evolved the platform's modular architecture with Clean Architecture, SOLID, JWT/RBAC, and class-validator, reducing coupling and strengthening security and data validation. • Implemented integrations with Big Data, BrasilAPI, Stripe, and Pagarme, normalizing external data for consistent use across internal modules. • Automated builds and deployments with Docker, GitHub Actions, and AWS, including EC2, S3, RDS, Lambda, SES, and Secrets Manager.
A
Avantpro
Jun 2023 - Dec 2024
Junior Systems Development Analyst
Developed scalable APIs and microservices with TypeScript, Node.js, NestJS, Express, Fastify, and RabbitMQ for an e-commerce platform. • Designed and implemented around 4 microservices, decoupling critical capabilities and enabling independent application evolution. • Integrated Mercado Livre and Shopee APIs for strategic ad optimization data in a solution used by more than 150,000 sellers across Latin America. • Modeled SQL/NoSQL databases with PostgreSQL/Prisma, Firebird, MongoDB, Redis, and Firebase; worked with AWS/GCP, Docker, and GitHub Actions. • Organized tasks, led code reviews, and supervised automated tests with Jest and SuperTest.
E
EuroGrill Grills & Accessories
Jan 2022 - Dec 2022
Technical Assistant
Provided technical support to internal users for hardware, software, and workstations, addressing corporate environment requests. • Performed maintenance, installation, and configuration of equipment and applications, contributing to the availability of resources used by internal teams. • Supported users in ERP, CMS, and CRM systems, answering questions and tracking operational issues during tool usage. • Diagnosed and resolved access and functionality incidents, performing troubleshooting until service normalization and supporting operational continuity.

Education

U
Unifaj
2024 - 2028
Bachelor's Degree in Computer Science
E
Etec João Belarmino
2020 - 2023
Systems development technician

Skills

Languages

TypeScript/JavaScript/Go/Golang/Python

Backend & APIs

Node.js/NestJS/Express/Fastify/Gin/REST APIs/GraphQL/JWT/RBAC/Big Data/class-validator

Frontend & Mobile

Next.js/React/Vue/Nuxt/TanStack/React Native/TailwindCSS

Architecture

Web Architecture/Clean Architecture/SOLID/Microservices/Multitenant SaaS/External integrations

Data & Cache

PostgreSQL/SQL Server/MongoDB/Redis/Firebird/DynamoDB/Firebase/TypeORM/Prisma/Oracle/Apache Cassandra

Messaging

RabbitMQ/BullMQ/Kafka

AI & RAG

OpenAI/LangChain.js/RAG/Embeddings/LLMs/Swagger/OpenAPI

Cloud & DevOps

AWS/GCP/Docker/Linux/GitHub Actions/CI/CD/EC2/S3/RDS/Lambda/SES/Secrets Manager

Version Control & Tools

Git/GitHub/Gitflow/Jest/SuperTest/Postman/ClickUp/Jira/DBeaver

Methods

Scrum/Kanban

Professional Projects

TradeSee

Multitenant SaaS for supply chain and international trade. I worked on fullstack modules, Big Data, BrasilAPI, Stripe, and Pagarme integrations, modular architecture evolution, and a real-time query chatbot for around 30 partner companies.

TypeScript/NestJS/Next.js/GraphQL/PostgreSQL/TypeORM/Docker/AWS

AvantPro

E-commerce and intelligence platform for sellers across Latin America. I developed APIs, microservices, and Mercado Livre/Shopee integrations for a solution used by more than 150,000 sellers.

TypeScript/Node.js/NestJS/Express/Fastify/RabbitMQ/PostgreSQL/MongoDB/Redis

Stratex

Strategic Brazilian commerce platform built in partnership with the São Paulo Chamber of Commerce. I contributed to smart reports and qualified lead generation for national expansion.

NestJS/React/TypeScript/PostgreSQL/AWS/Docker/REST APIs

Rialma

Corporate governance platform for Grupo Rialma. I developed REST APIs in Golang for agricultural management, powering operational dashboards used by more than 100 users and centralizing data from multiple farms.

Golang/Gin/TypeScript/React/PostgreSQL/SQL Server/Docker/REST APIs

Infinity System

Tailored management platform for local businesses, with configurable modules based on each operation. Currently, 3 companies have adopted the solution.

Next.js/React/TypeScript/NestJS/MongoDB/Mongoose/JWT/Passport.js/Axios/ECharts/React PDF/Baileys

Personal Projects

NegocioCerto

NegocioCerto is a business intelligence and due diligence platform focused on CNPJ analysis, compliance, and lead enrichment. The frontend delivers an interactive product website and API docs, while the backend exposes modular endpoints for enrichment, compliance scoring, risk checks, credit analysis, and API key/credits management.

Vite/TailwindCSS/NestJS/EC2/Stripe
WebsiteAPI Source

Akashi - BaaS

Akashi is a BaaS for developers who need a simple and intuitive backend. It automatically generates JSON for integration with the frontend and, in the paid version, supports external APIs.

Next/Nest/MongoDB/Stripe/Node/React
WebsiteSource

Previzapp - Climate Assistant

API of an intelligent climate assistant that provides enriched weather data through a RESTful API and integration with WhatsApp and Telegram bots. Converts addresses into coordinates, translates data into all languages, and generates recommendations based on current weather.

NestJS/OpenWeather API/Google Cloud Translation/Jest/NodeGeocoder/Telegraf/whatsapp-web.js
WebsiteSource

Festify - Spotify Festival Generator

Festify transforms Spotify history into stunning festival posters. The API integrates with Spotify for authentication and data collection, while the frontend provides a complete visual experience to create and share personalized artwork.

NestJS/MongoDB/NextJs/Tailwind/Radix UI/Lucide React/TypeScript/Docker/Spotify Web API
App SourceAPI SourceDemo

Nine - URL Shortener API

Robust REST API for URL shortening built with NestJS. Includes JWT authentication, full CRUD for URLs, support for custom codes, automated testing, and interactive documentation via Swagger.

NestJS/PostgreSQL/TypeORM/JWT/Docker/Swagger/Jest/ESLint/Prettier
WebsiteSource

Nalu Table

The NaluTable component is a versatile and complex React component designed to display data in a table format with various additional functionalities such as pagination, tabs, modals, and selection controls.

Typescript/Vite React/NextJs/Npm/TailwindCSS/Material UI/Styled Components
WebsiteSource

Get in touch: LinkedIn