Mateusz Rakowski
Senior Analytics Leader · 15+ years in data, 10 in fintech · Analytics at Credit Karma, with an LLM tilt.
- years in data
- 15+
- years in fintech
- 10
- years Toastmasters
- 9+
Ask about my work
A chat grounded on my accomplishments tracker and project notes. Ask about a project, a stack, or a decision; answers cite the facts in the tracker.
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Grounded on Mateusz’s accomplishments tracker · streamed from Claude
Work that shaped the ledger.
A subset of higher-signal projects from the last several years across Credit Karma and Toastmasters.
- Credit Karma AMA (Ask-Me-Anything)Credit Karma · Jan 2025 → Present
Central Analytics owns measurement for Credit Karma's in-app LLM experience, including engagement/adoption metrics, instrumentation, and impact evaluation as the rollout grows. Results pending.
LLMsPythonSQLproduct analyticsexperimentationLeadershipLLMProduct-AnalyticsFintech - AI FoundationsCredit Karma · Jan 2025 → Present
Helps push Cursor adoption across the analytics org and contributes to the knowledge-engine workstream feeding business + technical context into LLM-assisted analyst workflows. Adoption ramping; context layer still in development.
LLMs (Claude, ChatGPT)PythonSQLretrieval / knowledge-base toolingLeadershipLLMAnalyticsStrategy - OpenAI / Anthropic App-Store PresenceCredit Karma · Jun 2025 → Present
Supporting Credit Karma's launches in the OpenAI and (upcoming) Anthropic app stores. Team stood up measurement for a channel where traditional A/B testing isn't available, using a straightforward Difference-in-Differences matched-cohort approach.
Difference-in-Differences (DiD)PythonSQLcausal inferenceLeadershipLLMDistributionCausal-Inference - Commercialization / Personalized PathsCredit Karma · Jan 2025 → Present
Working on new customer segments for a rethink of personalization. Measurement framework and segment-level engagement goals are in place. MAU impact TBD.
PythonSQLLookerA/B testingsegmentationLeadershipAnalyticsExperimentationFintech - Senior Manager, CK ladderCredit Karma · Jan 2022 → Present
Leads multiple concurrent analytics workstreams (AI Foundations, Commercialization, App Store, AMA) under a player-coach model. Team size and org scope being quantified.
LLMsPythonSQLLookercausal inferenceexperimentationLeadershipAnalyticsDSLLM - Team Mentoring & Player-Coach LeadershipCredit Karma · Jan 2022 → Present
Mentors analysts as a player-coach: partners rather than delegates, contributes as IC on tight-deadline projects, and builds team trust and delivery cadence.
1:1scode reviewpair-analysisLookerSQLPythonLeadershipMentoringCommunication - LightboxCredit Karma · Jul 2018 → Jun 2020
Supported Credit Karma's Lightbox experiment as analytics partner; built the first analytics Python script at CK to execute dynamic SQL across diverse A/B test structures, plus bootstrapping scripts for statistical significance. Product and engineering owned the variant design calls; Lightbox ended up a significant revenue win for Credit Karma.
PythonSQLA/B testingbootstrappingdynamic SQL generationICAnalyticsExperimentationFintech - Competitive Public SpeakingToastmasters · Jan 2017 → Present
9+ years sustained Toastmasters membership: regular speaking practice, contest participation, and active club role. No title wins; what matters is the practice.
Public speakingspeech writingcoachingCommunicationPersonalLeadership
What I use, day to day.
No proficiency bars, just the things I actually reach for.
Data & Analytics
The daily working set, from SQL to causal inference.
- SQL
Primary working language for analytics.
- Python
Analysis, dynamic SQL generation, scripting.
- Looker
Dashboarding and exploration.
- Airflow
Pipeline orchestration.
- GitHub
Version control at work and for personal projects.
- A/B Testing & Experimentation
Design, analysis, edge cases.
- Bootstrapping
Significance on skewed metrics (see Lightbox).
- Difference-in-Differences (Causal Inference)
Active use on App Store launch measurement.
LLM & Modern Tooling
What I reach for when building LLM-native workflows.
- LLM Tooling (Claude, ChatGPT, Cursor)
Daily in workflow; Cursor-on-Claude for large repos.
- Claude
Primary daily LLM. Desktop app plus API.
- ChatGPT
Secondary LLM for quick tasks.
- Cursor
Helping push adoption across the CK analytics org.
Leadership & Communication
Player-coach leadership and sustained speaking practice.
- People Management
Player-coach; mentors analysts.
- Mentoring
Partner-style leadership.
- Public Speaking
9+ years Toastmasters, competitive speaker.
- Toastmasters
9+ years sustained practice. Active club member.
Analytics leader with an actuarial spine and an LLM tilt.
I started in actuarial work (reserving and pricing at Esurance and Towers Watson), which taught me to take uncertainty seriously and to defend every number. Over the last decade I moved that discipline into analytics leadership at Credit Karma, where I’ve grown from Manager II to Senior Manager on the Central Analytics team.
Right now my focus is personalization work for new customer segments, the AI Foundations program pushing LLM-assisted analyst workflows across the org, and Credit Karma’s in-app AMA experience. I care a lot about LLM-native workflows, not as novelty, but as the default way analysts should work in 2026. I run Cursor and Claude daily.
Outside the day job, I’ve been a Toastmasters member for 9+ years: competitive speaker, no title wins, what I value is the sustained practice. It’s made me a sharper communicator, a better mentor, and an engaging presenter of analytical work to executives.
Hiring for analytics leadership, or want to trade notes on LLMs?
Best route is email. I read it all.