About

The long way round

I bought my first share at thirteen, through my father. That is the earliest version of the thing that has actually driven my career, and it was never really about money — it was that markets are about the cleanest laboratory I know of for how incentives and evidence play out at scale.

What grew out of it was a habit rather than a hobby: wanting to know whether something is actually true before acting on it. That habit has run through the company I built and eventually sold, through how I manage property and personal finances, through the boards I have sat on, and through most of the commercial roles I have held. Retail management stayed part of my résumé over the years mainly because it is an arena where you can watch cause and effect play out directly, without much room to hide behind a narrative.

The commercial decade was real work, and for the most part it went well: a warehouse, then Ahlsell's largest Norwegian retail location, a second turnaround, three store openings, and then four years building out a private-label range — assortment strategy, supplier education, and, in parallel through my own company, a move into marketing, product, pricing, tenders and supplier negotiation, some of which carried on as a role alongside my studies. It was also increasingly frustrating. I kept watching decisions worth a lot of money get made on instinct — mine included — and I ran out of patience for arguing with a spreadsheet that had no evidence behind it.

So I went and learned it properly — applied data science at Noroff, full-time, alongside a full-time job for most of my studies. I ended up being hired back to Ahlsell, as a data scientist, in 2023.

What I have found since is that my most useful trait probably isn't technical skill on its own — that matters, but it's rarely the actual bottleneck. It's more often being able to draw on domain experience to understand a business problem well enough that whatever I build ends up pragmatic rather than just technically correct. Several of the projects I now own had capable people working on them before me, and progress had stalled anyway — one had been sitting open for years before I got to it. In cases like that, what's missing is rarely a better model. More often it's someone willing to sit with the stakeholders, work out what they actually need and where the data falls short, and shape something workable inside those limits — something that gets enough traction to keep improving from there. I lean toward iterative progress over waiting for a clean answer, which is uncomfortable more often than not and takes a fair bit of deliberate resilience; "fail fast" is less a slogan to me than a fairly accurate description of how it usually goes. I think that has quietly become something close to a guiding principle for me more generally — put yourself in a position to keep learning, and accept that most of the outcome sits in a grey area rather than in a clean win or a clean failure.

Outside work I sit on a housing-association board, manage rental flats in two countries, keep an eye on markets and rebalance my own portfolio, dance Cuban salsa, and probably over-engineer my home automation. I hold a private pilot licence, which I mention mostly because checklists changed how I think about deployment.

Kristofer DeYoung standing against a painted mural
Based in
Gothenburg, Sweden
Working languages
Swedish, Norwegian, English
Currently
Data Scientist, Ahlsell
Open to
Senior IC and lead roles — data science, AI engineering, analytics, solutions

Experience

Employment

2023 – present

Data Scientist

Ahlsell Sverige AB · Gothenburg, Sweden

Applied machine learning and AI engineering across commercial and supply-chain problems at one of the Nordics' largest B2B distributors — ~50 bn SEK, 7,000+ people across Sweden, Norway, Denmark and Finland. The role spans modelling, data engineering, cloud and DevOps (Terraform, Kubernetes), backend and API work, and front end — plus the translation between analytics and the people who have to act on the output. Project-level detail for this role is offline for now while I get sign-off to publish it publicly; happy to talk through it directly.

PythonAzureAzure OpenAIAzure MLTerraformKubernetesDatabricksdbtKafkaPower BI & DAXSQLReact
2021 – 2022

Product Manager (part-time)

Ahlsell Norge AS · Oslo, Norway

Pricing and range strategy for facility and storage products, negotiating contract and pricing terms through an unusually volatile commodities market — while studying alongside it.

Pricing strategySupplier negotiationB2B
2018 – 2021

Private Label Specialist

Ahlsell Norge AS · Oslo, Norway

Built out the private-label programme: national assortment and pricing, frame agreements and tenders for national clients, retail concept, and trend analysis feeding the next range. Over 150 days travelling and 90 destinations in 2018; became one of the more relied-on trade-show consultants in the business through 2018 and 2019.

Range strategyTendersTrade showsAnalysis
2014 – 2018

Interim Store Manager

Ahlsell Norge AS · Oslo, Norway

Took over Ahlsell's largest Norwegian retail location, Brobekk, with 15 staff, in the aftermath of a difficult merger. Restructured staffing, assortment and overheads, then repeated the turnaround at Bærum and helped open three further locations.

P&LTeam leadershipTurnaround
2013 – 2014

Warehouse Manager & Assistant Store Manager

Ahlsell Norge AS · Oslo, Norway

Warehouse operations and day-to-day running of the store alongside the store manager.

OperationsInventory
2009 – 2012

Department Manager

Smart Club AS · Slependen, Norway

Day-to-day running of a retail department: staffing, service, inventory, merchandising, budget and store safety.

Retail managementBudgeting
2008

Korpral

81st Rapid Reaction Platoon, Swedish Armed Forces · Halmstad, Sweden

National service. Awarded best soldier; held a position of trust as protection assistant.

Boards & ventures

Governance and things I have run myself

Small-company and association board work, and a decade of running privately held property. Useful practice at reading a set of accounts and asking the uncomfortable question.

Present

Board member

BRF Nordostpassagen · Gothenburg, Sweden

Board work for a Gothenburg housing association — property and construction projects, finances and administration, member communication, and an ongoing push to digitalise how the association runs: member pages, booking-system and analytics integrations.

2011 – present

Owner / landlord

Privately held rental units · Oslo & Gothenburg

Long-run management of privately held rental property in Norway and Sweden.

2019 – 2020

Board member

Alycore AS · Oslo, Norway

Oversaw a liquidation process in the interest of shareholders and creditors.

2014 – 2019

Owner

Perax AS (PerfectArt.no) · Oslo, Norway

Built a small import and retail business: sourcing and price negotiation with domestic and foreign consultants, a multi-channel sales platform, and the logistics behind it.

2014 – 2016

Board member

Boligsameiet Conradis gate 1 · Oslo, Norway

Ran a fire-suppression retrofit to new regulations, a full refurbishment of the common areas, and modernisation of the building's data and TV systems.

Education

Where the technical half came from

From 2021 · 180 ECTS

BSc, Applied Data Science

Noroff University College · Oslo, Norway — studied part-time throughout, alongside a full-time role and board work.

  • Machine learning — regression, KNN, trees and random forest, SVM, k-means, PCA, neural networks
  • Big data — Spark and PySpark, Hadoop, Hive, HDFS/MapReduce, Databricks
  • Statistics — statistical analysis tools and techniques; discrete mathematics (two levels); pure mathematics for computing
  • Software — object-oriented programming and SOLID, professional software development, UML, testing and Git, algorithms and data structures
  • Data — conceptual modelling, RDBMS and normalisation, NoSQL across Cassandra, MongoDB, Redis and Neo4j; data visualisation
  • Major project — congestion modelling on Västtrafik open data (write-up and live dashboard)

Continuing study

Looking at part-time master's routes in technology leadership and digital transformation — the natural next step for someone who wants to keep one foot in the modelling and one in what the organisation does with it.

Certifications & earlier schooling

  • Private Pilot Licence — FAA, 2012
  • Bareboat Cruising Certification — Sail in Asia, 2018
  • High school diploma — The American Embassy School, New Delhi, India
  • Upper secondary — LBS Kreativa Gymnasiet, Sweden

Skills

What I can do, without the star ratings

I used to publish a five-square competence scale for every skill on this site. It was precise-looking and not very honest — self-assessment is a poor instrument. So: here is what I work with, grouped by how it fits together. The strongest signal of what I can actually do is on the work page.

Languages & query

PythonSQLBashRHTML & CSSMarkdownLaTeX

Cloud, platform & DevOps

AzureTerraformKubernetesDockerAzure DevOps & CI/CDDatabricksdbtApache KafkaDelta / SparkGit

ML engineering

Azure ML pipelinesMLOpsModel monitoring & driftRetraining workflowsFeature consistencyEvaluation harnesses

Modelling & statistics

scikit-learnRegressionClassificationForecastingk-means & DBSCANRandom forest & treesPCANeural networksTensorFlowHypothesis testingHoldout & experiment design

AI systems

Azure OpenAIStructured extraction from documentsOutput evaluationPrompt designRAG patternsHuman-in-the-loop reviewNLP / BERT

Backend & product

REST API designBackend servicesReact / ViteStreamlitPower BI templates & DAXHuman-facing review tooling

Analysis & delivery

pandasNumPyMatplotlibSeabornPlotlyPower BIExcel (unreasonably well)

Databases

Databricks SQLPostgreSQL / SQLiteMongoDBCassandraNeo4jRedis

Commercial

Business acumenProblem framing & scopingPricing strategySupplier negotiationRange & assortmentTendersP&L ownershipTeam leadershipStakeholder communicationPublic speaking
Where I am strongest: Python and SQL against a Databricks/dbt platform; framing a messy commercial question as something modellable; getting a result in front of the person who has to act on it. What I am deliberately deepening: evaluation methodology for LLM systems, and the engineering discipline around deploying models rather than notebooks.

Get in touch

Always up for a conversation.

Whether that is a role, a collaboration, or someone stuck on a modelling problem who wants a second pair of eyes.