Ari Lamstein

I'm a software engineer who focuses on analytics projects.

I most recently worked as a Staff Data Science Engineer at MarketBridge, a marketing analytics consultancy. While at MarketBridge I developed internal tools for our data scientists, ran workshops on data science and mentored data scientists on software engineering.

I began my career as a software engineer at leading tech companies. During this time I worked on a hit video game and two start-ups that had successful exits.

Outside of work, I have created several open source projects. These projects are often tools for analyzing public datasets.

My most recent project is the Python module multiyear, which helps analyze trends in Census data. This module started out for personal use, and in March 2025 I contributed it to the censusdis package.

Before multiyear, I developed the Covid Demographics Explorer, a Python app for exploring how American counties have changed since Covid-19. I spoke about this project at the San Francisco Python Meetup in June 2024.

Earlier in my career, I focused on R and created choroplethr, a suite of R packages for visualizing demographic statistics. Choroplethr has been downloaded 300k times and is the subject of three online courses.

Latest Blog Posts

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Ari Lamstein

June 9, 2025

Video: Covid Demographics Explorer v2

I just put together a video walkthrough of my latest blog post. Since the post was pretty detailed and...

Ari Lamstein

June 2, 2025

New Release: Covid Demographics Explorer v2

(Update 6/9/25: I have recorded a video walkthrough of this post. You can watch it here). I recently published...

Ari Lamstein

May 20, 2025

Course Review: Build AI Agents with Python

I was slow to jump on the LLM bandwagon. In some ways this is surprising. Although it was a...

Past Projects - Delete this section?

Chroplethr

Choroplethr is a suite of R packages that facilitate the creation of choropleth (i.e. color-coded) maps. Choroplethr connects to multiple public data sources, allowing you to explore current and historic demographics. It has been installed hundreds of thousands of times and is the subject of three online courses. I have spoken about it at several conferences.

Testimonials

People I Have Worked With:

Ari is extremely knowledgeable, detailed oriented and very nice person as well as professional to work with. He has helped me lot with my R projects. He is quick and smart. I can safely say he is an expert in teaching. I would highly recommend him

Nukehet Kayahan

Sr, MTC Data and AI Architect at Microsoft

Ari effectively balances the level of his explanations with the knowledge of his clients, be they beginners or professionals alike. More importantly he really understands his client's problems and supports others to achieve successful outcomes through a variety of channels. I did his online courses as well as a one to one session online. He organized and explained everything in advance to ensure that the session can start on time, and the live online session was a great success. His professionalism, work ethics and enthusiasm are exemplary, his knowledge is extensive, and above all his personable and kind manner set him entirely apart. I would be more than happy to work with Ari again.

Lucie H. Krennwallher

Founder of DrLucie -Agile Pfrede

Ari Lamstein recently conducted his workshop Mapping Open Data in R for the Berkeley R Meetup at U.C. Berkeley. The workshop was a tremendous.... Ari is a highly skilled and effective presenter. He is knowledgeable, well-organized, patient, and clear! His workshop examples and supporting materials are excellent. Participants came away from the workshop with the basic skills necessary to start working on mapping projects on their own. The response to his workshop by participants was universally positive, several have requested a follow-up session. If you have a mapping project and need training or technical assistance, I highly recommend Ari's workshop and services for your organization.

Allan Miller

Data Scientist, Educator, and R Programmer

Ari is a consummate professional. He is a true team player, and a very talented software developer and data scientist. Most importantly, he’s a fantastic teacher and mentor, able to communicate complex software and data science concepts to anyone from entry level analysts to senior executives. He is a lifelong learner who is constantly upskilling himself on the latest packages and libraries. He will be a great addition to any software development / data science team that needs a “Swiss army knife” who can do it all.

Andy Hasselwander

Chief Analytics Officer at Marketbridge

Ari is one of the best teachers/ trainers of coding languages (and in general) that I have worked with. He has a knack for breaking down complex things in a way that is intuitive, and helps people understand the 'why' behind various things, beyond just the 'what'. I have learned immensely from working with Ari on both project-based work and more formal coding trainings and have benefitted greatly from doing so. Working with Ari is a smooth process, he communicates well, and can do a great job of connecting business needs to technical/ coding/ software needs and requirements, effectively solving a variety of problems. I would wholeheartedly recommend Ari to anyone looking for someone with highly experienced coding/software development skills, an extremely friendly and professional demeanor, and a knack for teaching and imparting wisdom to those around them.

Jared Lampal

Manager, Analytics & Strategy at Marketbridge

Ari is the best mentor one could ask for while learning both R and general software development in a professional context. Before I worked with him, I had only one college semester of R under my belt. Now I’ve written an R package we actively use at MarketBridge to deliver valuable insights to our clients. This would not have been possible without Ari’s guidance and support. He is an excellent teacher who doesn’t tell you the solution, but helps you find it on your own. He is so deeply knowledgeable about the world of R that I found myself leaving our discussions with not just the answers to my questions, but a wealth of resources and far deeper understanding of the underlying behavior of my code. Ari’s experience in software development gave me excellent guidance through his comments toward more readable, more efficient, and less error-prone code. I wholeheartedly endorse him for any work regarding R or software development, particularly in the context of the data engineering necessary for analysis and statistical modeling.

Sam Burridge

Consultant at Marketbridge

Ari is both a gifted teacher and a very insightful programmer -- attributes you don't always find strongly within the same person! He developed a clear plan to advance the R programming skills of our group and boosted our overall competency to the degree he projected in our SOI. In short, his vision matches execution, and he has the skills, insight and experience needed to succeed as a statistical consultant. Thank you Ari!

Derek Darves, PhD

Vice President at AEA investors LP

Ari is fun to work with, intelligent, and a solid software engineer. Ari took on the challenge of making the HubPages Q&A service better. I was very impressed by Ari's passion for the problem, his drive to find patterns in the Q&A analytics, and his ideas for improving the service. I believe that Ari will be a great addition to any software team.

Larry Freeman

Staff Engineer at Walmart Labs

Ari, who championed the Question and Answer feature on HubPages.com, did so much more than his "Software Engineer" title suggests. In addition to heading up initiatives for new features that improved Q&A on our site, he went the extra mile to design reports to make it easy to analyze their efficacy. It was great to work with someone who, in addition to building things, really made sure they mattered and made the impact they were intended to make. I hope I will have the opportunity to work with him again in the future!

Simone Collins

VC | PE | International Ops | 5x bestselling author | Education

Ari is a great communicator. Compared to other software engineers whom I've worked with, he stands out because he loves to write reports and visualize data. He worked on several projects while at HubPages, but perhaps the most significant was a system for notifying users of interesting events on the site. The scalable, adaptive system notified users via email and live notifications. It has greatly improved user engagement on HubPages.

Fawntia Fowler

Resourceful full-stack developer in the digital media industry

Nukehet Kayahan

Sr, MTC Data and AI Architect at Microsoft

Lucie H. Krennwallher

Founder of DrLucie -Agile Pfrede

Allan Miller

Data Scientist, Educator, and R Programmer

Andy Hasselwander

Chief Analytics Officer at Marketbridge

Jared Lampal

Manager, Analytics & Strategy at Marketbridge

Sam Burridge

Consultant at Marketbridge

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Ari Lamstein

Software Engineer

Ari Lamstein

Ari Lamstein

I'm a software engineer who focuses on analytics projects.

Latest Blog Posts

Video: Covid Demographics Explorer v2

New Release: Covid Demographics Explorer v2

Course Review: Build AI Agents with Python

Past Projects - Delete this section?

Chroplethr

Testimonials

People I Have Worked With:

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Ari Lamstein

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