Data Science and Databases

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Do Your Homework: 7 AWS Certified Solutions Architect Exam Tips

Cloud architects with the AWS Certified Solutions Architect - Associate qualification are in high demand, with good reason—the AWS exam sets the bar high. What’s the best way to prepare for it?

8 minute readContinue Reading
Ross Bowman

Ross Bowman

As a Deloitte alumnus and AWS Certified Solutions Architect, Ross loves helping companies use innovative technologies to solve problems.

Timestamp Truncation: A Ruby on Rails ActiveRecord Tale

Tests should keep apps from being flaky. But tests themselves can become flaky—even the most straightforward ones. Here’s how we dove into a problematic test on a PostgreSQL-backed Rails app, and what we uncovered.

< 5 minute readContinue Reading
Maciek Rząsa

Maciek Rząsa

A knowledge-sharing advocate, engineer, and Scrum Master, Maciek’s into distributed systems, NLP, and writing software that matters.

Semi-supervised Image Classification With Unlabeled Data

Supervised learning is the key to computer vision and deep learning. However, what happens when you don’t have access to large, human-labeled datasets?

In this article, Toptal Computer Vision Developer Urwa Muaz demonstrates the potential of semi-supervised image classification using unlabeled datasets.

9 minute readContinue Reading
Urwa Muaz

Urwa Muaz

Urwa is a Fulbright scholar and data science graduate from NYU. He loves leveraging machine learning to solve practical problems.

MCMC Methods: Metropolis-Hastings and Bayesian Inference

Markov Chain Monte Carlo (MCMC) methods let us compute samples from a distribution even though we can’t do this relying on traditional methods.

In this article, Toptal Data Scientist Divyanshu Kalra will introduce you to Bayesian methods and Metropolis-Hastings, demonstrating their potential in the field of probabilistic programming.

12 minute readContinue Reading
Divyanshu Kalra

Divyanshu Kalra

Divyanshu is a data scientist and full-stack developer versed in various languages. He has published three research papers in this field.

Oracle to SQL Server and SQL Server to Oracle Migration Guide - Pt. 3

Migrating in either direction between Microsoft SQL Server and Oracle Database? Code migration tools, public synonyms, and change management are important to keep in mind.

14 minute readContinue Reading
Leonid Draginsky

Leonid Draginsky

Leonid has 20+ years as a multi-platform developer and DBA, with special expertise in Oracle and SQL Server cross-platform migrations.

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Oracle to SQL Server and SQL Server to Oracle Migration Guide - Pt. 2

Migrating in either direction between Microsoft SQL Server and Oracle Database? This round of pitfalls to avoid includes coverage of sequences, identity columns, and filtered indexes.

8 minute readContinue Reading
Leonid Draginsky

Leonid Draginsky

Leonid has 20+ years as a multi-platform developer and DBA, with special expertise in Oracle and SQL Server cross-platform migrations.

Machines and Trust: How to Mitigate AI Bias

Unwanted AI bias is already a widespread problem. Machine learning models can replicate or exacerbate existing biases, often in ways that are not detected until release. So what can be done about it?

13 minute readContinue Reading
Michael McKenna

Michael McKenna

Mike is a data scientist, data ethicist, and machine learning engineer specializing in health and retail. He currently serves as the Director of Data Ethics at Services Australia. As a senior data scientist at CVS, Mike led COVID-19 vaccine demand forecasting, liaising closely with the White House and the CDC as part of Operation Warp Speed.

Toptal Engineering Expert

Gabriel Courtemanche

Gabriel is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering teams at Shopify and Autodesk to launching new applications for startups. Most of his work consists of leading technical teams, by creating an easy development environment, fixing technical debts, providing best practices code examples, and mentoring devs.
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