Hildean Dantas - Full Stack Developer

Overview

Full Stack Developer (Pleno/Senior) at Bilion, with 2 years of work experience. Before that Full Stack Developer at NeoSyx Desenvolvimento. Works with Amazon ECS, AWS, Docker, Nest.JS, Next.js and GitHub Actions.

Phone

Timeline

Universidade Cruzeiro do Sul (UNICSUL)

Bachelor's Degree · Engenharia de Software

2026–2026 São Paulo, São Paulo

Full Stack Developer (Pleno/Senior) · Senior

Bilion · Full-Time

Nov 2025 to Apr 2026 5 Months Rio de Janeiro In office

Led technical work for rebuilding and evolving a web platform, shaping architecture and implementing business flows with Next.js interfaces and NestJS APIs. Planned and executed a migration from Bubble/Xano to an AWS-based code architecture using Vercel. Implemented payment processing with Pagar.me, including split rules, webhooks, and idempotent transaction state handling, while designing AWS infrastructure and CI/CD deployment with monitoring.

Node JS

Nest.JS

Next.js

Vercel

AWS

Amazon ECS

Amazon CloudWatch

Docker

CI/CD

Socket.IO

Full Stack Developer · Middle

NeoSyx Desenvolvimento · Full-Time

Aug 2023 to Sep 2025 2 Years 1 Month Rio de Janeiro In office

Developed and maintained C#/.NET integration APIs using ASP.NET Core Minimal APIs and Entity Framework for sending and receiving data. Improved backend performance by optimizing user retrieval and pagination patterns. Built Node.js microservices with Sequelize and scheduling/monitoring, and added asynchronous Python processing with RabbitMQ. Also delivered automation using Selenium and Pandas and supported CI/CD pipelines with GitHub Actions.

C#

ASP.NET Core

Entity Framework Core

Node JS

Sequelize

Python

RabbitMQ

Selenium

Pandas

GitHub Actions

Data Analysis Intern / Level 1-2 Support · Junior

Claro Brasil · Internship

Jan 2022 to Aug 2023 1 Year 7 Months Rio de Janeiro In office

Wrote complex SQL queries to validate business rules and cross-check data. Created database procedures to structure and safely process sensitive and critical information. Produced management reports through an internal tool and built strategic analytics dashboards using Power BI and Excel VBA while providing Level 1 and Level 2 support.

SQL

Power BI

Microsoft Excel

Projects

Plataforma Bilion

Nov 2025 to Jul 2026 8 Months

Next.js

Nest.JS

AWS

Technical skills

Languages

6

Python

SQL

C#

Node JS

TypeScript

JavaScript

Node JS

5

Sequelize

Nest.JS

Bcrypt

Express

TypeORM

DevOps

10

AWS

GitHub Actions

Amazon ECS

Amazon CloudWatch

Docker

Vercel

CI/CD

Amazon S3

AWS Lambda

GitHub

Frontend

4

Next.js

Socket.IO

React.js

Tailwind CSS

Databases

4

RabbitMQ

PostgreSQL

MySQL

MS SQL

Other

12

ASP.NET Core

Entity Framework Core

Selenium

Pandas

Power BI

Microsoft Excel

FastAPI

SQLAlchemy

Git

Rest API

PostCSS

Gitflow

Backend Developer Code level: Middle Confidence: Medium Data Platform

Backend data-focused Python engineer at a middle level specializing in pragmatic ETL and dynamic data ingestion workflows. The strongest proven skill is building dynamic CSV-to-database ingestion with runtime SQLAlchemy model creation and chunked pandas ingestion as implemented in app/utils/file_processor.py. The public code does not show production-grade concerns such as migrations/schema evolution, comprehensive security/auth, structured observability, or automated tests.

API Design

3/10

How well APIs are designed

Basic, functional API surface with file upload handling and CORS but no versioning, idempotency keys, or formal error contract; fits a small service rather than a hardened public API.

Evidence

hildeandantas/csv-importer/app/routes/import_router.py: POST /import route with CSV extension check hildeandantas/csv-importer/app/main.py: FastAPI app, CORS middleware and router inclusion hildeandantas/csv-importer/app/services/importer.py: async importer endpoint that saves uploaded file in chunks

Data Layer & Database

4/10

Working with databases

Practical dynamic schema handling and data ingestion using SQLAlchemy and pandas with runtime table creation and chunked inserts, but no migration history, explicit transactions, isolation control, or schema evolution strategy.

Evidence

hildeandantas/csv-importer/app/utils/file_processor.py: dynamic_table_verify creating dynamic SQLAlchemy models and truncation logic hildeandantas/csv-importer/app/utils/file_processor.py: ingest_csv_data reading CSV in chunks and using DataFrame.to_sql for inserts

Scalability & Performance

4/10

Handling load and speed

Shows attention to throughput via pandas chunking and a simple worker queue using threads, but lacks production-grade scaling patterns (no connection pooling control, backoff/retry strategies, cache or load-protection).

Evidence

hildeandantas/csv-importer/app/utils/file_processor.py: ingest_csv_data uses chunksize=1000 and iterates pandas chunks hildeandantas/csv-importer/app/utils/queue_manager.py: QueueManager with multiple worker threads processing tasks

System Architecture

3/10

Overall system structure

Clear separation into routes, services, utils and db modules and a standalone queue manager shows deliberate modularity for an MVP, but lacks config/secret management patterns, graceful shutdown hooks for workers, or inter-service contracts.

Evidence

hildeandantas/csv-importer/app/main.py: app composition and middleware configuration hildeandantas/csv-importer/app/services/importer.py: service-layer saving uploads and delegating work to utils hildeandantas/csv-importer/app/utils/queue_manager.py: separate concurrency component

Security & Auth

2/10

Protecting data and access

Minimal input hygiene and no auth; some sanitization of names exists but there are surface risks around dynamic table names and no secrets lifecycle or dependency auditing shown.

Evidence

hildeandantas/csv-importer/app/routes/import_router.py: rejects non-.csv uploads hildeandantas/csv-importer/app/utils/file_processor.py: to_camel_case used to sanitize table/column names hildeandantas/csv-importer/app/db/database.py: dotenv import referenced (secrets handling is present but not fully implemented in shown code)

Reliability & Observability

3/10

Stability and monitoring

Basic error handling and task lifecycle management exist (try/except, file cleanup, worker stop signal), but there is no structured logging, metrics, retry/backoff, timeouts, or test coverage demonstrated for reliability.

Evidence

hildeandantas/csv-importer/app/services/importer.py: exception handling during file write with cleanup and HTTPException on failure hildeandantas/csv-importer/app/utils/file_processor.py: top-level try/except around processing with informative prints hildeandantas/csv-importer/app/utils/queue_manager.py: stop() uses sentinel None and joins workers

Expertise

Python· Middle

Databases & Vector Storage· Middle

Microservices & API Architecture· Middle

Technologies

Python· since 2023 · Middle

Rest API

SQLAlchemy

RabbitMQ· since 2023

FastAPI

Recommendations

Develop small-to-medium ETL pipelines and internal data ingestion services that require dynamic schema handling and chunked ingestion.
Implement and productionize data import utilities, adding migrations, transactional boundaries and schema evolution policies.
Build backend API endpoints for admin tooling and data onboarding where a pragmatic FastAPI + SQLAlchemy approach suffices.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

mercadinho-binho webhook-motor csv-importer

Frontend Developer Code level: Junior Confidence: Medium Fullstack

Fullstack engineer (mid-level) focused on building TypeScript-based REST APIs with sound service and model separation. The strongest proven skill is backend API and data-layer implementation, evidenced by the service/controller/model structure and the Sequelize model hooks that integrate password hashing. There is little to no human-authored frontend UI, performance tuning, automated tests or domain-specific business logic evidenced in the analyzed files.

UI Component Architecture

How interface parts are built

Not evidenced in public code

Responsive & Cross-browser

Works on all screens and browsers

Not evidenced in public code

Performance Optimization

Speed of the interface

Not evidenced in public code

Accessibility & Semantics

Usable for everyone

Not evidenced in public code

State Management & Data Flow

3/10

Managing data in the app

Clear server-side data flow separation (controllers -> services -> models), input validation and error handling, and a model-level hook for password hashing demonstrate basic server-state discipline and service boundary design.

Evidence

api-rest-ts/src/services/userService.ts: service layer with input checks, unique-email check and CRUD flows

api-rest-ts/src/models/userModel.ts: Sequelize model with beforeCreate/beforeUpdate hooks to hash passwords via BcryptUtil

api-rest-ts/src/controllers/userController.ts: controller methods mapping service results to HTTP status codes and JSON responses

UX & Visual Polish

Look and feel quality

Not evidenced in public code

Technologies

JavaScript

TypeScript· since 2025 · Junior

Node JS· since 2023 · Junior

Nest.JS· since 2025

Tailwind CSS

Next.js· since 2025

Express

Socket.IO· since 2025

GitHub Actions· since 2023

Vercel· since 2025

Bcrypt

CI/CD· since 2025

Git

AWS· since 2025

Docker· since 2025

React.js

Gitflow

Sequelize· since 2023

TypeORM

PostCSS

AWS Lambda

GitHub

Amazon S3

Amazon ECS· since 2025

Amazon CloudWatch· since 2025

Recommendations

Build and maintain TypeScript REST APIs with authentication and user management using Express and Sequelize, including migrations and model hooks.
Implement backend-focused features such as safe CRUD flows, input validation, and secure password handling for SaaS or internal admin systems.
Extend to fullstack MVPs by pairing this backend work with a lightweight React frontend and well-scoped API contracts.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

mercadinho-binho api-rest-ts

Job preferences

Work permits: Brazil, United States, Portugal
Citizenship: Brazil
Employment type: Full-Time