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Conterval

Data and AI consulting

Know what your data says, and how sure you can be.

Conterval builds machine learning models, data pipelines and dashboards that hold up in production, with the uncertainty stated up front.

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What Conterval does

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Machine learning

Forecasting, classification and ranking models, evaluated honestly and deployed where your team can run them.

ETL and data engineering

Data cleaning, reliable pipelines and analytics engineering that turn raw data into tested tables your analysts can trust.

Data visualization

Dashboards and charts that answer a specific question and get opened more than once.

Applied AI

LLM features and document search built on your own data, with evaluation in place before launch.

Statistics and experimentation

A/B tests, causal analysis and estimates that come with a range, so a decision can weigh the risk.

Training

Hands-on workshops that leave your team able to maintain the work, built on books and courses about Polars and pandas.

How an engagement runs

Small scope first, then build.

Scope

Start from the decision the work should improve, check the data can support it, and agree what success looks like.

Build

Deliver in short cycles against real data, so you see working output early and can change direction cheaply.

Hand over

Finish with documented code, tests and a walkthrough, so your team owns the result.

Portfolio

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Forecasting by bread type for a commercial bakery
Forecasting
Data analysis

Turning a retailer’s single monthly forecast into a clear production plan for white and brown bread.

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From the blog

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  • 2026-07-03 Advanced pivot tables with polars Sometimes group by does the trick
  • 2026-06-09 How the 52-week high/low can guide your investment choice
  • 2026-06-08 Slicing and dicing pandas & polars dataframes How to select subsets of rows and columns
  • 2026-05-16 Don't Write Polars Code with a Pandas Accent JORAM MUTENGE
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Data and AI consulting

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