Marcos is available for hire

Marcos Pereira

Verified Expert in Engineering

Software Developer

Porto, Portugal

Toptal member since July 28, 2017

Expertise

Algorithms Full-stack Software Engineering Back-end Game Development Web Development Web Scraping Data Visualization Big Data Data Analytics Machine Learning Natural Language Processing (NLP)Artificial Intelligence (AI)WebSockets RAG Polygon

Bio

Marcos is a full-stack developer with over a decade of experience building and maintaining market-defining products. His machine learning background includes a deep learning research stint at MLC under Rosanne Liu (Google DeepMind). He also nurtures an interest in 3D games and simulations, most often relying on the Unity engine, where he has found success as an asset store publisher.

Portfolio

Machine Learning Collective

Jupyter, Python, TensorFlow, Keras, Data Visualization, Big Data...

Transloadit

Bash, TypeScript, DevOps, React, Heroku

Headrush Learning, Inc.

GraphQL, Meteor, JavaScript, Node.js, APIs, AWS Elastic Beanstalk

Experience

JavaScript - 10 years SQL - 10 years Unity - 8 years Web Development - 8 years Python - 8 years Node.js - 7 years TypeScript - 6 years Machine Learning - 5 years

Availability

Part-time

Preferred Environment

Visual Studio Code (VS Code), GitHub, Unity, Jupyter, Google Colaboratory (Colab), Docker

The most amazing...

...project I've worked on is a neural network inspired by cellular automata that learns to solve reasoning tasks.

Work Experience

Machine Learning Researcher

2020 - PRESENT

Machine Learning Collective

Built a deep learning model based on neural cellular automata that learned to solve reasoning tasks.
Provided feedback to other members on research group meetings.
Participated in discussions on future research projects.

Technologies: Jupyter, Python, TensorFlow, Keras, Data Visualization, Big Data, Data Analytics, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT), Machine Learning, Artificial Intelligence (AI), GitHub, Git, Algorithms, OpenAI API, Pandas, NumPy, Computer Vision, Neo4j, Data Science, PyTorch, Large Language Models (LLMs), Fine-tuning, Retrieval-augmented Generation (RAG)

DevOps Engineer

2023 - 2023

Transloadit

Iterated on Bash-based infrastructure pipeline, including security reviews of existing core build scripts.
Overhauled existing GitHub Actions set up with new CI automation and refactoring of existing workflows.
Implemented successfully a new robot functionality.

Technologies: Bash, TypeScript, DevOps, React, Heroku

Back-end Engineer

2023 - 2023

Headrush Learning, Inc.

Built and integrated GraphQL API into the mission-critical legacy system.
Automated custom report generation based on GraphQL query templates.
Consulted on the web security of deployed instances and implemented preventative measures.

Technologies: GraphQL, Meteor, JavaScript, Node.js, APIs, AWS Elastic Beanstalk

Data Engineer | Back-end Developer

2021 - 2022

Angle Health

Developed ingestion pipelines for insurance provider data.
Informed business decisions with insights gathered from provider data analysis.
Designed data model that unified schemas from different networks.

Technologies: Google Colaboratory (Colab), Python, Django, JavaScript, Data Visualization, Web Applications, Big Data, Full-stack, Amazon Web Services (AWS), MySQL, REST APIs, Data Analytics, SQL, APIs, REST, Machine Learning, Artificial Intelligence (AI), Back-end, CI/CD Pipelines, GitHub, Git, Algorithms, Technical Architecture, Flask, API Architecture, NumPy, FastAPI, SQLAlchemy, Alembic, System Architecture, Data Science, Object-oriented Programming (OOP), Networking, Pandas

Back-end Engineer

2021 - 2021

Apprentice

Developed functionality for lab procedure execution guidance.
Handled migration of the company's core API from Sails to Express.
Introduced containerization, streamlining developer workflow and eliminating machine-state issues.

Technologies: Node.js, MongoDB, Docker, Web Development, Express.js, TypeScript, JavaScript, Web Applications, Full-stack, Amazon Web Services (AWS), MySQL, REST APIs, SQL, APIs, REST, NoSQL, Back-end, Architecture, CI/CD Pipelines, GitHub, Git, Algorithms, Technical Architecture, API Architecture, System Architecture, Object-oriented Programming (OOP), Networking

Data Engineer and Back-end Developer

2020 - 2021

Athlane

Built the API that acted as the company's backbone for managing streamer and sponsorship data.
Developed various tools for data gathering and analysis.
Led the back-end development team, designing server architecture and delegating workload.

Technologies: JavaScript, Node.js, PostgreSQL, Web Development, Express.js, TypeScript, Data Visualization, Web Applications, Big Data, Full-stack, Amazon Web Services (AWS), GraphQL, TypeScript 3, MySQL, Docker, REST APIs, Data Analytics, SQL, APIs, REST, Machine Learning, NoSQL, Firebase, Back-end, Architecture, Google BigQuery, CI/CD Pipelines, GitHub, Git, Algorithms, Technical Architecture, API Architecture, System Architecture, Data Science, Object-oriented Programming (OOP), Networking

Back-end Engineer

2019 - 2020

Youblicity

Built a Node.js API to support front-end functionality such as user management, sponsor registration, and payment tracking.
Developed various tools to handle Twitch data extraction and processing.
Extracted analytics from several terabytes of streamer data.
Architected computer vision tools to reward sponsored Twitch streams for partnership compliance.

Technologies: Node.js, BigQuery, Data Science, Web Development, Express.js, TypeScript, JavaScript, Data Visualization, Web Applications, Big Data, Amazon Web Services (AWS), GraphQL, TypeScript 3, Neo4j, MySQL, Docker, REST APIs, Amazon S3 (AWS S3), WebSockets, Amazon EC2, Data Analytics, Web Scraping, SQL, APIs, REST, Machine Learning, NoSQL, Artificial Intelligence (AI), Back-end, Architecture, Google BigQuery, CI/CD Pipelines, GitHub, Git, Algorithms, Technical Architecture, Leadership, OpenAPI, API Architecture, Computer Vision, System Architecture, Team Leadership, Object-oriented Programming (OOP), Networking, Heroku

Lead Engineer

2018 - 2019

Swish Labs

Delivered a popular browser extension to thousands of active users.
Led the tech overhaul of an eastern market leader clothing label.
Built a secure and concurrent share trading market from scratch.
Developed self-documenting REST and GraphQL APIs backed by Node.js.

Technologies: MongoDB, PostgreSQL, Vue, Node.js, Web Development, JavaScript, Web Applications, Full-stack, Amazon Web Services (AWS), TypeScript 3, MySQL, Elasticsearch, Docker, REST APIs, Amazon RDS, Amazon CloudWatch, APIs, REST, Shopify API, eCommerce, NoSQL, Back-end, Architecture, CI/CD Pipelines, GitHub, Git, Algorithms, Technical Architecture, OpenAPI, API Architecture, Google Cloud, System Architecture, Team Leadership, Object-oriented Programming (OOP), Networking

Web Developer

2018 - 2018

Kogneta

Created internal tools for improving reach and customer acquisition.
Leveraged Google Cloud solutions for data processing.
Developed serverless tools for data storage and analysis.

Technologies: Google Cloud, Node.js, Web Development, JavaScript, Web Applications, Full-stack, Data Analytics, APIs, REST, NoSQL, Back-end, Architecture, GitHub, Git, Algorithms, Technical Architecture, Serverless Architecture, Data Science, Google Cloud Platform (GCP)

Tooling Engineer

2017 - 2018

Kitty's Co.

Contributed to internal tools for optimizing the work of the agency's creatives.
Developed Node.js scripts that interacted with the Facebook Marketing API.
Created serverless scripts that were run on AWS Lambda.
Wrote AWS Step Functions to manage and coordinate script execution.

Technologies: AWS Lambda, Node.js, Web Development, JavaScript, Web Applications, Full-stack, Amazon Web Services (AWS), Amazon DynamoDB, Amazon EC2, APIs, REST, Back-end, Architecture, Terraform, Amazon API Gateway, GitHub, Git, Algorithms, Technical Architecture, Serverless Architecture, Amazon S3 (AWS S3), System Architecture, AWS Elastic Beanstalk

Lead Developer

2013 - 2017

Okorana

Created a drag and drop interface in AngularJS that allows the placing and resizing of widgets.
Developed REST APIs used to power single-page apps using both SQL and NoSQL databases.
Set up build systems using Grunt and Gulp, which increased useful development time.
Led a team of developers in organizing contributions and communication between members.
Hired new team members to assist with the front-end design of web apps.
Created a browser extension for a customizable new tab page.

Technologies: MongoDB, AngularJS, Node.js, JavaScript, Web Development, Web Applications, Full-stack, Amazon Web Services (AWS), TypeScript 3, MySQL, Redis, REST APIs, Amazon S3 (AWS S3), WebSockets, Redis Cache, Amazon EC2, Amazon CloudFront CDN, WebRTC, HTML, CSS, Angular, Vue, APIs, REST, NoSQL, Back-end, Architecture, CI/CD Pipelines, Go, GitHub, Git, Algorithms, Technical Architecture, Leadership, API Architecture, System Architecture, Team Leadership, Meteor, AWS Elastic Beanstalk, Object-oriented Programming (OOP), Networking, Heroku

Experience

Backpropagation from Scratch

https://marcospereira.me/2022/08/18/backpropagation-from-scratch/

A deep look into the foundations of modern AI, starting by building up the mathematical intuition for backpropagation, then using this knowledge to implement a convolutional neural network.

The network is then trained on MNIST, achieving 85% accuracy.

Neural Cellular Automata for ARC

https://marcospereira.me/2020/11/01/ml-collective-arc/

A deep learning research project where a model was trained to solve tasks from François Chollet's Abstraction and Reasoning Corpus. The model was based on and inspired by previous work on neural cellular automata.

Polygon Reducer

https://marcospereira.me/2022/01/10/i-just-published-polygon-reducer-on-the-unity-asset-store/

A Unity package that allows the user to reduce the polygon count of any mesh, featuring a real-time slider. The tool produces reliable results without significantly noticeable artifacts, even when reducing a mesh's vertex count to less than half its initial value.

Unity 3D Game

A game built with the Unity game engine, featuring competitive multiplayer in a procedurally generated world.

Progress updates on Twitter: https://twitter.com/voxelbased.

I am fascinated by how much is involved in making a good game. There are endless things to consider. Some things I have worked on so far and have written about are a procedural generation (https://marcospereira.me/2022/05/10/a-simple-hash-for-perlin-noise/) and multithreading (https://marcospereira.me/2022/05/06/safe-async-tasks-in-unity/).

On Frame Rate Independence

https://marcospereira.me/2023/11/15/frame-rate-independent-lerp/

A blog post diving into how we can determine whether some way of iteratively updating a value will be affected by variations in time steps. This includes an extensive analysis of a common approach, iterative linear interpolation.

CharityTab

CharityTab was a fully customizable new tab page, available as a web app and browser extension. It allowed users to donate to a charity of choice by viewing ads and shopping through sponsored bookmarks.

Twitter Infinite Scroll Disabler

https://github.com/marcospgp/twitter-infinite-scroll-disabler

A productivity tool that disabled Twitter's infinite scrolling feed and replaced it with a "Show More" button. This project was deprecated due to the high maintenance required to keep up with regular updates to Twitter's web user interface.

Watch Together

https://github.com/marcospgp/watch-together

A Chrome extension that allows multiple users to synchronize their streams on a popular streaming service using an intermediary Node.js server.

When users join a room by name, their stream will automatically be synchronized with others in the same room. If a user pauses the player, everyone else's stream is also paused.

Flappy Goat

https://github.com/marcospgp/flappygoat

A twist on the mobile hit game where the player must avoid crashing into obstacles in an infinitely scrolling world. Built from scratch with a custom fixed-timestep game engine based on HTML Canvas technology.

Twitch Chat Bot Modules

https://github.com/marcospgp/koalabot-custom-modules

A set of custom modules written for a popular Twitch bot that allows users to duel and gamble the points they earn while watching their favorite streamers. They were developed in JavaScript and deployed using Heroku.

Link Shortener and Web Status Checker

https://github.com/marcospgp/infinifty-web-apps

A link shortener and web status checker built in PHP. The link shortener was built to encompass two domains: the host domain that allows the user to minify links and a short domain that redirects the shortened addresses to the correct endpoint.

Haskell Sokoban

https://github.com/marcospgp/haskell-sokoban

A 2D top-down puzzle game where the player pushes crates around in a grid with the objective of filling all the predefined storage locations. This project is written in Haskell and uses the Gloss vector graphics library.

Education

2015 - 2018

Bachelor's Degree in Software Engineering

University of Minho - Braga, Portugal

Skills

Libraries/APIs

NumPy, Node.js, REST APIs, PyTorch, OpenAPI, OpenAI API, Pandas, WebGL, Keras, TensorFlow, WebRTC, Vue, Shopify API, SQLAlchemy, React

Tools

GitHub, BigQuery, Git, Amazon CloudWatch, Amazon CloudFront CDN, Terraform, Jupyter

Languages

TypeScript, SQL, C#, GraphQL, C, Java, Python, JavaScript, HTML, CSS, HTML5, TypeScript 3, Haskell, PHP, C#.NET, Go, Bash

Frameworks

Unity3D, Unity, AngularJS, Express.js, .NET, .NET Core, Django, Flask, Alembic, Blazor, Angular

Paradigms

REST, Serverless Architecture, API Architecture, Object-oriented Programming (OOP), DevOps

Platforms

Docker, AWS Lambda, Visual Studio Code (VS Code), Amazon Web Services (AWS), Amazon EC2, Firebase, Meteor, AWS Elastic Beanstalk, Google Cloud Platform (GCP), Heroku

Storage

MongoDB, MySQL, PostgreSQL, Relational Databases, Amazon DynamoDB, Neo4j, Amazon S3 (AWS S3), NoSQL, Google Cloud, Redis, Redis Cache, Elasticsearch

Other

Chrome Extensions, Machine Learning, Data Science, Game Development, Algorithms, Web Development, APIs, API Design, Games, 3D Games, Game AI, Unity3D AI, Data Visualization, Web Applications, Big Data, Full-stack, Software Engineering, WebSockets, Data Analytics, Web Scraping, Natural Language Processing (NLP), Artificial Intelligence (AI), Back-end, Architecture, Google BigQuery, CI/CD Pipelines, Amazon API Gateway, Technical Architecture, Leadership, Computer Vision, System Architecture, Team Leadership, Networking, Generative Pre-trained Transformers (GPT), Large Language Models (LLMs), Fine-tuning, Retrieval-augmented Generation (RAG), Back-end Development, Deep Learning, Amazon RDS, eCommerce, FastAPI, Google Colaboratory (Colab)

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