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Daniel – React, Node.js, Typescript, experts in Lemon.io

Daniel

From Brazil (GMT-3)

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Full-stack Web DeveloperSenior
Hire developer
8 years of commercial experience
AI
Business intelligence
Gamedev
Healthcare
Sales
CRM
No-code software
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Daniel – React, Node.js, Typescript

Daniel is a highly skilled Full-Stack Engineer with over 8 years of experience, specializing in modern technologies such as TypeScript, Node.js, React.js, and Next.js. Renowned for his focus on delivering exceptional results, Daniel brings passion and innovation to projects he undertakes. With a proven ability to excel both independently and as part of a team, he thrives in initiating projects from the ground up and driving them to successful completion. His expertise and dedication make him a valuable asset to any development team.

Main technologies
React
5 years
Node.js
5 years
Typescript
5 years
AWS
1 year
Next.js
2 years
Additional skills
Python
Amazon SQS
AWS Lambda
GCP
Snowflake
OpenAI
MongoDB
Django
PostgreSQL
Docker
Angular
Redis
Tailwind CSS
Celery
Flask
Vue.js
Express.js
Spring Boot
Electron.js
Redux
GitHub
CI/CD
GitLab CI/CD
Supabase
Ready to start
One week after accepting the offer.
Direct hire
Potentially possible

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Experience Highlights

Senior Full-stack Developer
Jul 2023 - Jan 20246 months
Project Overview

It is a work management platform designed to help teams organize workflows, projects, and data in a single location. It integrates customizable databases with user-friendly tools such as task assignments, timelines, and automation. This makes it ideal for various use cases, including project management, CRM, and HR.

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Responsibilities:
  • Was responsible for enhancing the performance of both frontend and backend applications;
  • Decreased the number of requests to start the application by 20%;
  • Implemented caching for formula calculations, resulting in up to a 70% reduction in processing time;
  • Reduced the number of database queries during calculations using batch queries;
  • Introduced new data visualizations in the dashboard application and resolved existing bugs.
Project Tech stack:
Angular
Django
Python
Typescript
React
PostgreSQL
Redis
Senior Full-stack Developer
Dec 2022 - Jun 20235 months
Project Overview

It is a platform designed to help non-technical users gain insights from data warehouses using natural language. It creates a knowledge base of the database, including its schema and a few anonymous sample records, to comprehend user questions and translate them into queries. This enables users to retrieve data from warehouses like Snowflake and Amazon Redshift without needing technical expertise. The results are then presented in a simple, user-friendly interface.

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Responsibilities:
  • Built all front-end components based on the provided design document;
  • Resolved critical bugs and performance issues in the backend;
  • Developed a virtualized table to efficiently display thousands of records on the front end without compromising performance;
  • Integrated the frontend with the backend application, handling streaming messages using OpenAI technology;
  • Created a chat application similar to ChatGPT in 2023, incorporating various UX improvements for an enhanced user experience;
  • Implemented a multiple workspace feature, allowing users to access different organizations and teams.
Project Tech stack:
React
Next.js
Python
Django
OpenAI
Snowflake
GCP
PostgreSQL
Docker
Tailwind CSS
Express.js
Typescript
Senior Back-end Developer
Mar 2022 - Dec 20229 months
Project Overview

It is a nonprofit that collaborates with game studios to combat climate change. It does this by integrating environmental actions into gaming experiences. Through in-game events and purchases, players can support initiatives such as tree planting and carbon offsetting while they enjoy their games.

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Responsibilities:
  • Developed a serverless application that can handle hundreds of requests per second;
  • Implemented database connection handling to support up to 500 concurrent Lambda functions;
  • Set up a robust queue system using AWS SQS and AWS Lambda;
  • Introduced a ledger database for transaction transparency using AWS QLDB;
  • Developed the payment feature, integrating it with Stripe, a key system component;
  • Wrote unit and integration tests for the entire backend.
Project Tech stack:
React
Node.js
Serverless Computing
AWS Lambda
Amazon SQS
AWS
Typescript
Docker
Redis
MongoDB
Tailwind CSS
Tech Lead / Senior Back-end Developer
Jun 2020 - Jan 20221 year 7 months
Project Overview

It is a document management platform that automates workflows, making it easy to create, maintain, and manage documents. With its no-code interface, users can build custom workflows, use dynamic templates, and integrate business logic to streamline processes and reduce errors.

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Responsibilities:
  • Was responsible for planning and coordinating the development of the backend and new integrations;
  • Designed a pattern for building new integrations, which significantly reduced development time;
  • Implemented integrations with several HR tools, including SmartSuite, Checkr, and Workday;
  • Re-implemented the main integration from scratch to fix existing bugs, improve performance, and enhance code maintainability;
  • Developed a dashboard for monitoring and managing all instances;
  • Automated the deployment of new instances, reducing deployment time by 95%.
Project Tech stack:
Vue.js
Express.js
Typescript
Flask
Python
PostgreSQL
Celery
Redis
Full-stack Developer
Dec 2019 - Aug 20207 months
Project Overview

It is one of Brazil's largest drugstore chains. This system was the main in-store platform, handling purchases and payments, inventory management, reimbursements, and more.

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Responsibilities:
  • Developed the main components using React and SCSS;
  • Created the end-to-end flow, including adding products to the cart and completing the payment;
  • Integrated payment providers to handle transactions;
  • Developed a Node.js module to use card machines' DLLs with Electron;
  • Implemented shortcuts to enhance usability.
Project Tech stack:
React
Redux
Redux Saga
SCSS
Node.js
Express.js
MongoDB
Spring Boot
Kotlin
Electron.js

Education

2022
Computer Science
Bachelor

Languages

Portuguese
Advanced
English
Advanced

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