Cristhian is available for hire

Cristhian Camilo Gomez Neira

Verified Expert in Engineering

Full-stack Developer

Bogotá - Bogota, Colombia

Toptal member since September 29, 2021

Expertise

Web Development Full-stack Front-end Back-end Developers Big Data Architecture Data Engineering Ruby on Rails JavaScript React.js Git Database Cloud Engineering Node.js

Bio

Cristhian is a back-end developer and data scientist passionate about algorithms, data science, and software development. He has experience in back-end design, software architecture, machine learning model design, and algorithm definition. Cristhian is a fast learner, and he is studying every day to improve his knowledge and skills.

Portfolio

Higher Bar AI, PBC

Python, React, AWS Amplify, AWS Fargate, Amazon Web Services (AWS)...

C.M. Dillon Company inc

JavaScript, Web Development, OpenAI API, Full-stack, ChatGPT...

Alex S Montgomery

Computer Vision, React, Python, OpenCV, Machine Learning...

Experience

Data Science - 7 years
JavaScript - 5 years
Software Development - 4 years
Software Architecture - 4 years
Neural Networks - 3 years
Algorithms - 3 years
Camunda BPM - 2 years
Elasticsearch - 2 years

Availability

Part-time

Preferred Environment

Camunda BPM, Elasticsearch, Apache Airflow, Docker, Node.js, JSX, Python 3, React, Vue, Ruby on Rails (RoR)

The most amazing...

...thing I've implemented is a complete recommender machine learning system for matching people with potential projects in a marketplace for voice actors.

Work Experience

LLM Expert | Full-stack Python Developer

2023 - 2023

Higher Bar AI, PBC

Developed an app where clients can use an LLM to process and evaluate surveys.
Developed a system that can parse surveys in any format, evaluate them, and give recommendations using different evaluation lenses.
Used the feedback that users gave to the service to improve the LLM and provide accurate results.

Technologies: Python, React, AWS Amplify, AWS Fargate, Amazon Web Services (AWS), Amazon Cognito, Data Engineering, ETL, OpenAI GPT-4 API, Vector Data, OpenAI GPT-3 API, Language Models, Hugging Face, Chatbots, Natural Language Understanding (NLU), OpenAI, Stripe, Fine-tuning, Large Language Models (LLMs), Retrieval-augmented Generation (RAG), Big Data, Prompt Engineering, Vector Databases, Back-end Performance, Design Language

Web Developer | OpenAI API Expert

2023 - 2023

C.M. Dillon Company inc

Developed a quote management application that the client uses daily.
Used GPT to make automatic quotes based on emails and text.
Connected the application with QuickBooks Desktop SDK, making it do stable updates every minute.

Technologies: JavaScript, Web Development, OpenAI API, Full-stack, ChatGPT, Artificial Intelligence (AI), Language Models, Hugging Face, NestJS, OpenAI, Fine-tuning, Large Language Models (LLMs), Retrieval-augmented Generation (RAG), Prompt Engineering, QuickBooks API, OpenAI GPT-3 API, OpenAI GPT-4 API, Vector Databases, Back-end Performance, Design Language

AI Expert | React and Python Developer

2022 - 2023

Alex S Montgomery

Improved computer vision models to apply face swapping to images and videos.
Created multiple new features for the platform and integrated it with multiple systems.
Improved the architecture of the application and the servers management.

Technologies: Computer Vision, React, Python, OpenCV, Machine Learning, Artificial Intelligence (AI), Web Development, Full-stack, API Integration, API Development, Solution Architecture, Full-stack Development, AI Design, Automation, Process Automation, Pandas, SQLAlchemy, FastAPI, DataFrames, Front-end, Front-end Development, Back-end Development, Unit Testing, Flask, Three.js, Git, Lint, Agile, Databases, Serverless, Lambda Functions, CI/CD Pipelines, Code Review, Estimations, Data Processing, Expo, Google Cloud Platform (GCP), Data Lakes, Back-end Performance

Senior Ruby on Rails Developer

2022 - 2023

Farmgirl Flowers

Refactored the platform to make it more stable and make the code cleaner.
Implemented new key features on the platform related to tracking and order management.
Created documentation for the site, explaining the processes of the company and the code.

Technologies: Ruby on Rails (RoR), Heroku, Amazon Web Services (AWS), Team Management, Communication, Web Development, Full-stack, API Integration, API Development, Solution Architecture, Full-stack Development, Automation, Kubernetes, Architecture, Front-end, Back-end Development, Docker Hub, Git, Agile, Databases, Lambda Functions, CI/CD Pipelines, Code Review, Estimations, Technical Leadership, Back-end Performance, Team Leadership, Design Patterns, Stripe Payments, Stripe API

Full-stack Developer | React and RoR

2022 - 2023

Springboard Collaborative Inc.

Developed multiple features inside the platform to enhance the user experience better.
Solved multiple bugs directly affecting the platform and the application's functionality.
Created documentation for the engineering processes of the company.
Involved in these activities to join and participate in the innovative project.

Technologies: Ruby on Rails (RoR), JavaScript, React, Scrum, Agile, APIs, SQL, Responsive UI, Rails Engines, Communication, Web Development, Full-stack, API Integration, API Development, Solution Architecture, Full-stack Development, Kubernetes, Architecture, Front-end, Front-end Development, Back-end Development, Unit Testing, Docker Hub, Git, Lint, Databases, CI/CD Pipelines, Code Review, Estimations, Data Scraping, Google Cloud Platform (GCP), Back-end Performance, Team Leadership, Design Patterns

Algorithm Engineer

2021 - 2023

Voice123

Optimized the search algorithm to improve the click-through rate of the platform.
Improved the quality of the invitations sent to voice actors using a recommender system.
Enhanced the algorithm that predicts the number of people that need to be invited to fulfill a project using machine learning and data science methods.
Created an automatic tagging system to organize and analyze the information of voice actors in the platform.
Developed a categorization message model to organize data about messages in the platform and prevent spam.

Technologies: Python, Algorithms, Data Science, Machine Learning, Camunda BPM, Apache Airflow, Node.js, JavaScript, Elasticsearch, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT), Convolutional Neural Networks (CNNs), TensorFlow, Sequence Models, Deep Neural Networks (DNNs), Software Development, Software Design, Docker, Python 3, Back-end, MySQL, PostgreSQL, Amazon Web Services (AWS), APIs, REST APIs, CSS, TypeScript, GitHub, HTML5, Express.js, Containers, MongoDB Atlas, AWS Lambda, Vue, Next.js, Communication, Web Development, API Integration, API Development, Solution Architecture, Leadership, Full-stack Development, AI Design, Automation, Process Automation, Google API, Google APIs, Kubernetes, Pandas, DataFrames, Architecture, Back-end Development, Unit Testing, Flask, Three.js, Docker Hub, Git, Lint, OpenAPI, Agile, Databases, Amazon EC2, Serverless, Lambda Functions, CI/CD Pipelines, Estimations, Technical Leadership, Data Processing, Hugging Face, NestJS, Chatbots, Google Cloud Platform (GCP), Natural Language Understanding (NLU), OpenAI, Fine-tuning, Large Language Models (LLMs), Big Data, Data Lakes, OpenAI GPT-3 API, OpenAI GPT-4 API, Language Models, Vector Databases, Back-end Performance, Design Language, Team Leadership, Design Patterns

Senior ML Developer

2021 - 2022

Authtech

Developed a machine learning model that has the ability to detect flash patterns for authorization with high accuracy and a processing time of less than 30 ms.
Optimized 5E models for high speed on mobile devices (Android and iOS).
Created a mobile application and an SDK currently used by multiple users and companies for Android and iOS, using React Native, Swift, and Java.

Technologies: Algorithms, Machine Learning, TensorFlow, Computer Vision, iOS, Android, Redux, Communication, Web Development, API Integration, Artificial Intelligence (AI), API Development, Solution Architecture, Leadership, AI Design, Automation, Process Automation, Google API, Google APIs, Kubernetes, Django, Pandas, SQLAlchemy, FastAPI, DataFrames, Mobile Development, Back-end Development, Mobile, Unit Testing, Flask, Git, Agile, Serverless, Lambda Functions, CI/CD Pipelines, Data Scraping, Data Processing, Hugging Face, Swift, Xcode, Fine-tuning, Large Language Models (LLMs), Big Data, Data Lakes, Language Models, Back-end Performance, Team Leadership

AI Expert | Python Back-end Developer

2021 - 2022

Notitia Technologies Inc.

Developed multiple features inside the platform to transform PDF and Microsoft documents into textual information, making it available to search engines.
Optimized the process inside the platform so documents could be received and processed in a fraction of a second.
Solved multiple high bugs directly affecting the platform and the application's functionality.
Engaged hourly as an experienced developer to document parsing for this AI startup.

Technologies: Python, GraphQL, AWS Amplify, Amazon Web Services (AWS), React, Communication, Web Development, API Integration, Artificial Intelligence (AI), API Development, Solution Architecture, AI Design, Automation, Process Automation, Google API, Google APIs, Django, Pandas, SQLAlchemy, Back-end Development, Unit Testing, Flask, Docker Hub, Git, Agile, Databases, Serverless, CI/CD Pipelines, Data Scraping, Data Processing, Amazon S3 (AWS S3), Fine-tuning, Large Language Models (LLMs), Back-end Performance

Back-end Developer | Express and Node.js

2021 - 2021

b.plat LLC

Developed new features on an application that serves multiple users in the USA.
Developed ML models to solve multiple problems in the company.
Created multiple scripts to automatize data preprocessing.

Technologies: Node.js, JavaScript, Express.js, MongoDB, TypeScript, Amazon Web Services (AWS), Python 3, iOS, Android, Redux, Communication, Web Development, API Integration, API Development, Solution Architecture, Automation, Process Automation, Mobile Development, Architecture, Back-end Development, Unit Testing, Git, Lint, Agile, Databases, Amazon EC2, CI/CD Pipelines, Data Processing, Expo, Amazon S3 (AWS S3), Amazon API Gateway, Stripe, Back-end Performance, Design Patterns, Stripe Payments, Stripe API, Dart

Full-stack Developer

2020 - 2020

Voice123

Started the internationalization and localization efforts of the platform.
Tracked and fixed different bugs of high impact on the platform.
Spearheaded the optimization of the company's central algorithms.

Technologies: Node.js, Camunda BPM, Elasticsearch, Apache Airflow, JavaScript, Software Development, Software Design, Docker, Back-end, MySQL, PostgreSQL, Amazon Web Services (AWS), APIs, REST APIs, CSS, TypeScript, GitHub, HTML5, Express.js, Containers, MongoDB Atlas, AWS Lambda, Responsive UI, Communication, Web Development, Full-stack, API Integration, API Development, Solution Architecture, Full-stack Development, Google API, Google APIs, Kubernetes, Mobile Development, Front-end, Front-end Development, Back-end Development, Mobile, Unit Testing, Docker Hub, Git, Lint, Agile, Databases, Amazon EC2, CI/CD Pipelines, Google Cloud Platform (GCP), Amazon S3 (AWS S3), Amazon API Gateway, Stripe, Back-end Performance, Design Patterns, Stripe Payments, Stripe API

Full-stack Developer | Product Manager

2019 - 2019

Cargapp

Developed a web management system for load generators to search for truck drivers that could transport their products.
Developed a mobile app for truck drivers integrated with a tracking system and a real-time database to take jobs that fit their needs.
Helped the management team to make decisions based on data analysis and mathematical models.

Technologies: Node.js, JavaScript, React, Ruby on Rails (RoR), Software Development, Software Design, Software Architecture, IT Project Management, DevOps, React Native, Back-end, MySQL, PostgreSQL, Amazon Web Services (AWS), APIs, Linux, MongoDB, REST APIs, HTML, CSS, GitHub, GitHub API, HTML5, Bootstrap, Ruby on Rails 5, Express.js, Ruby, Firebase Authentication, Responsive UI, Communication, Web Development, Full-stack, API Integration, API Development, Full-stack Development, Front-end, Front-end Development, Back-end Development, Mobile, Git, Lint, Agile, Databases, Amazon EC2, Xcode, Amazon S3 (AWS S3), Stripe, Design Patterns, Flutter

Full-stack Developer

2019 - 2019

VegaMedia Group

Integrated multiple tracking and control systems of various trucks.
Implemented a complete tracking system that gives real-time information to managers about the location, speed, and acceleration of trucks and gives alerts if the truck drivers stay in the same place for a long time.
Analyzed relevant data so managers can have the most optimal routes and understand the behavior of the truck drivers on different routes.

Technologies: PHP, Node.js, C++, Software Development, Software Design, Software Architecture, IT Project Management, DevOps, JavaScript, Firebase, Back-end, MySQL, MariaDB, Amazon Web Services (AWS), APIs, Linux, MongoDB, REST APIs, HTML, CSS, GitHub, GitHub API, HTML5, Bootstrap, Express.js, React, Responsive UI, Communication, Web Development, Full-stack, API Integration, API Development, Full-stack Development, Front-end, Front-end Development, Back-end Development, Mobile, Git, Lint, Agile, Databases, Xcode, Amazon S3 (AWS S3), Amazon API Gateway

Full-stack Developer | Project Manager

2018 - 2019

MB Media Digital

Developed five different web applications and eCommerce used by big companies in the music industry.
Created a complete tracking architecture so clients can have control in real-time about the health of the systems.
Implemented intelligent systems that help the business managers to make decisions and do data analysis.

Technologies: PHP, Node.js, Ruby on Rails 4, React, Software Development, Software Design, Software Architecture, IT Project Management, DevOps, Firebase, GPS, Back-end, MySQL, MariaDB, Amazon Web Services (AWS), APIs, Linux, MongoDB, REST APIs, HTML, CSS, GitHub, GitHub API, HTML5, Bootstrap, Ruby on Rails 5, Ruby on Rails (RoR), Express.js, Ruby, Firebase Authentication, Communication, Web Development, Full-stack, API Integration, API Development, Full-stack Development, Front-end, Front-end Development, Back-end Development, Git, Lint, Databases, Amazon S3 (AWS S3), Amazon API Gateway

Experience

Voice123

http://www.voice123.com

Voice123 is a worldwide marketplace for professional voice actors where I acted as the platform's algorithm engineer and data scientist, analyzing data daily, designing models and algorithms based on data, maintaining the platform algorithms, and implementing new algorithms in the back-end, using technologies such as Elasticsearch Camunda, Node.js, and Apache Airflow.

Cargapp App for Truck Drivers

A React Native application connected to a Ruby on Rails back end and a tracking system made in PHP. The application used a real-time database so managers of truck drivers could see the information and location of their trucks.

VegaMedia Tracking System

VegaMedia is a PHP tracking system that integrates external GPS services and gets signals and information for Raspberry Pis connected to trucks around the country. The tracking system helps big companies keep track of their trucks, evaluate the behavior of their truck drivers, and helps them select the most appropriate routes.

Farmgirl Flowers Platform

https://farmgirlflowers.com/

A Ruby on Rails and React-based retail shop that sells flowers to the US. The application has integration with multiple APIs and also offers an incredible user experience. I was part of the refactoring team, so we stabilized the application, made it better for the end user, and improved the code to make it cleaner.

Education

2017 - 2023

Bachelor's Degree in Mathematics

National University of Colombia - Bogota, Colombia

2015 - 2021

Bachelor's Degree in Computer Science

National University of Colombia - Bogotá, Colombia

Coursera

JULY 2017 - PRESENT

Machine Learning

Coursera

Skills

Libraries/APIs

Node.js, React, REST APIs, API Development, Pandas, TensorFlow, GitHub API, AWS Amplify, Google API, Google APIs, SQLAlchemy, Three.js, Stripe, Stripe API, Vue, Rails Engines, OpenCV, OpenAPI, OpenAI API, QuickBooks API

Tools

Slack, Visual Studio, GitHub, Git, Expo, Xcode, Camunda BPM, Firebase Authentication, MongoDB Atlas, Docker Hub, AWS Fargate, Amazon Cognito, Apache Airflow, JSX, ChatGPT

Languages

JavaScript, Python, Python 3, HTML, CSS, TypeScript, HTML5, Ruby, SQL, C++, GraphQL, Swift, Java, PHP, C#, Dart

Frameworks

Ruby on Rails (RoR), React Native, Express.js, Next.js, Bootstrap, Ruby on Rails 5, Redux, Django, Flask, NestJS, Ruby on Rails 4, Flutter

Paradigms

Agile, Mobile Development, Unit Testing, ETL, Design Patterns, Automation, DevOps, Scrum

Platforms

MacOS, iOS, Kubernetes, Amazon EC2, Google Cloud Platform (GCP), Docker, Firebase, Amazon Web Services (AWS), Linux, AWS Lambda, Heroku, Android, Mobile

Storage

Elasticsearch, MySQL, PostgreSQL, MariaDB, Databases, Amazon S3 (AWS S3), MongoDB, Data Lakes

Other

Data Science, Back-end, APIs, Communication, Web Development, Full-stack, API Integration, Full-stack Development, DataFrames, Architecture, Front-end, Front-end Development, Back-end Development, Lint, Data Engineering, Hugging Face, Big Data, Neural Networks, Convolutional Neural Networks (CNNs), Deep Learning, Machine Learning, Natural Language Processing (NLP), Sequence Models, Time Series, Deep Neural Networks (DNNs), Software Development, Software Design, Software Architecture, Algorithms, Containers, Responsive UI, Artificial Intelligence (AI), Generative Pre-trained Transformers (GPT), Solution Architecture, Leadership, AI Design, Process Automation, FastAPI, Serverless, Lambda Functions, CI/CD Pipelines, Code Review, Estimations, Technical Leadership, Data Scraping, Data Processing, OpenAI GPT-4 API, OpenAI GPT-3 API, Large Language Models (LLMs), Chatbots, Natural Language Understanding (NLU), Amazon API Gateway, OpenAI, Fine-tuning, Vector Databases, Back-end Performance, Design Language, Team Leadership, Stripe Payments, IT Project Management, GPS, Computer Vision, Team Management, Internet of Things (IoT), Mathematics, Complex Problem Solving, Modeling, Vector Data, Language Models, Prompt Engineering, Retrieval-augmented Generation (RAG), MLflow, LangChain, Model Deployment, AI Modeling

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