Andrés Ruiz, Developer in Panama City, Panamá Province, Panama
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Andrés Ruiz

Verified Expert  in Engineering

Machine Learning Developer

Panama City, Panamá Province, Panama
Toptal Member Since
October 3, 2019

Andrés is a US-educated software engineer with ten years of experience tending to computers to solve human problems. He is proficient in Elixir, Go, Java, Python, JavaScript, Linux, and various databases. Andrés has been a part of large and small companies on the American and European continents, which has helped him better understand the critical components necessary for software to be successful.


River Financial
Elixir, Phoenix, PostgreSQL, Metabase, GitHub, Stress Testing
Reddit, Inc.
Back-end, Message Queues, Python, Go, Apache Kafka...
Spotify - Main
Go, Docker, Kubernetes, Test-driven Development (TDD), Stress Testing




Preferred Environment

Vim Text Editor, JetBrains, Linux

The most amazing...

...project I've created and supported is a platform to track and better understand settings for buying inventory for Amazon Fresh.

Work Experience

Senior Software Developer

2023 - PRESENT
River Financial
  • Optimized the recurring order algorithm to decrease processing costs by 20%.
  • Implemented automation for order cancellation, which helped the finance team decrease their operations time by 20 hours per week.
  • Improved automatic batching/settling logic, which increased the amount of processed orders by 25%.
Technologies: Elixir, Phoenix, PostgreSQL, Metabase, GitHub, Stress Testing

Senior Back-end Developer

2023 - 2023
Reddit, Inc.
  • Migrated features used for trending notifications to a more modern system, which increased the click-through rate by 10%.
  • Helped clean up remaining A/B testing experiments, which simplified the codebase and allowed other engineers to focus on less tedious tasks.
  • Implemented several strategies that increased CTT by 15% and decreased cancels by 5%.
Technologies: Back-end, Message Queues, Python, Go, Apache Kafka, Amazon Simple Queue Service (SQS), RabbitMQ, Event-driven Programming, Testing, Stress Testing

Software Engineer

2022 - 2023
Spotify - Main
  • Implemented a throttling ad delivery mechanism, bringing close to $250,000 in revenue for Q2/2022.
  • Helped migrate multiple microservices to a Kubernetes cluster, saving developers close to 100 hours on ops-related tasks.
  • Designed and implemented a feature that allowed customers to include multiple ads in a podcast, bringing close to $100,000 in revenue for Q2/2022.
Technologies: Go, Docker, Kubernetes, Test-driven Development (TDD), Stress Testing

Lead Full-stack Developer

2021 - 2022
  • Worked closely with a designer on a complete refactoring of the UI, which increased conversion rates by 15% and made our platform more attractive to investors.
  • Designed and developed a system to create, manage, and execute leveraged transactions, which brought close to $1 million in revenue in 2021.
  • Collaborated with a team of three developers to maintain and improve various aspects of the trading platform, specifically limit and market orders, increasing our user base from 100x in 1 year.
Technologies: JavaScript, TypeScript, React, Node.js, Web3.js, Test-driven Development (TDD), CSS, HTML, Web Scraping

Software Engineer

2021 - 2021
  • Developed an app that helps traders visualize order book offerings for future trading in the energy sector.
  • Helped write automated tests to verify the application was successfully calculating different statistics.
  • Collaborated with traders and clearing houses to make sure our application adhered to the best standards.
Technologies: Go, Test-driven Development (TDD)

Machine Learning Engineer

2018 - 2019
3D Hubs
  • Developed the necessary infrastructure to move the machine learning pipeline to AWS.
  • Contributed to the design and implementation of integrations with multiple external services for accounting (QuickBooks) and finance (Stripe).
  • Designed and implemented automated refunds, which saved close to 10 hours a week for all our customer support representatives.
  • Developed a 3D geometric search algorithm to find similar pairs of 3D models.
Technologies: JavaScript, PostgreSQL, Python, Amazon Web Services (AWS), Neural Networks, Python 3, Test-driven Development (TDD), QuickBooks API, CSS, HTML

Sofware Engineer

2016 - 2018
  • Created and supported a platform to track and better understand the settings for buying inventory for Amazon Fresh.
  • Developed an application to help allocate inventory to physical spaces in the most optimal way possible.
  • Collaborated with an external team to design and implement tracking of inventory in a more granular fashion, which enabled the team to save close to 100 man/hours per month.
Technologies: Amazon Web Services (AWS), MySQL, Java, AngularJS, Test-driven Development (TDD), HTML

Marketing Automation Software
Used Python and Vue to help develop multiple features to increase engagement and the quality of leads given to users. In summary, we increased the unique user count by 5% and lead exposure by 15%.

Ceramic Pro Accounting Integration

Helped create the accounting integration to ensure invoices, quotes, payments, etc., were synchronized to QuickBooks. I used a separate service for this synchronization so we could dispatch async requests and scale independently.

I developed a tool that helps users manage their savings accounts.

I developed this app to manage rental properties.

Trip Planner
I developed this product to manage upcoming trips.

This server enables communication between computers A and B when they can't talk directly to each other. It does this by using a third computer, C, which both A and B can connect and talk to.

I developed this app to play hangman online.


Go, Python 3, JavaScript, Python, TypeScript, CSS, HTML, Java 9, Elixir, C++, Java, ECMAScript (ES6), Elm


QuickBooks API, Stripe, React, Stripe API, Vue, NumPy, Web3.js, Node.js


Test-driven Development (TDD), Stress Testing, Scrum, UX Design, Event-driven Programming, Testing


Web Scraping, Intuit QuickBooks, Machine Learning, Amazon Kinesis, Software Development, Algorithms, Neural Networks, Back-end, Message Queues, Metabase


AWS SDK, JetBrains, Vim Text Editor, Amazon Simple Queue Service (SQS), RabbitMQ, GitHub


Linux, Docker, MacOS, Google Cloud Platform (GCP), Amazon Web Services (AWS), Kubernetes, Apache Kafka


PostgreSQL, MongoDB, MySQL, Amazon S3 (AWS S3), Amazon DynamoDB


Django, Spring, AngularJS, Phoenix

2014 - 2016

Master's Degree in Computer Science

University of New Mexico - Albuquerque, NM, USA

2009 - 2014

Bachelor's Degree in Computer Systems Management

National University of Colombia - Bogotá, Colombia

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