# Senior Data Scientist at IIIIIIUS

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Deliver applied data science and impact

- **Company:** IIIIIIUS (https://jobs.trythestack.co/companies/iiiiiius)
- **Location:** Madrid, Spain
- **Work arrangement:** On-site
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Data science, Statistics, Python, Impact evaluation, Causal analysis, Behavioural science, Machine learning, Generative AI, Exploratory data analysis, Statistical modelling, Feature construction, Difference-in-differences, Regression-based designs, Policy analysis, Technical communication, Quantitative analysis
- **Posted by employer:** 2026-04-03
- **Added to The Stack:** 2026-04-03
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://careers.icf.com/us/en/job/R2600373/Senior-Data-Scientist (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/senior-data-scientist-iiiiiius

## About the role

Responsibilities:
- Deliver applied data science and impact evaluations for public policy and programme work.
- Design and run causal analyses (DiD, regression designs, matching) and apply counterfactual reasoning to assess intervention effects.
- Work with messy, real-world datasets: cleaning, EDA, feature construction and reproducible workflows.
- Develop and test AI-supported analytic workflows and combine behavioural science insights with quantitative methods.
- Produce clear outputs: write report sections, present findings to clients and support proposals.
- Collaborate with policy researchers, evaluators and technical teams across multiple projects.

Requirements:
- Strong quantitative background (data science, statistics, economics, behavioural science or related social science).
- Professional experience in applied analysis, consulting, policy evaluation or research.
- Proficiency in Python for data analysis and reproducible workflows.
- Practical experience with causal inference methods (DiD, regression-based designs, matching) and threats to validity.
- Skilled in statistical modelling, EDA and communicating technical findings to non-technical stakeholders.
- Familiarity with behavioural science applications to evaluation and a commitment to rigorous, transparent methods.

## Responsibilities

The Senior Data Scientist will deliver applied data science solutions for public policy and evaluation projects while developing new AI-enabled analytical workflows. They will collaborate with policy researchers and evaluators to conduct causal analysis and present findings to stakeholders.

## Requirements

Candidates must have a strong quantitative background in data science, statistics, or social sciences with professional experience in applied research or consulting. Proficiency in Python and experience with causal inference methods or impact evaluation design are essential.

## FAQ

- **Is this Senior Data Scientist role still open?** It was posted on 2026-04-03. Listings more than 30 days old may no longer be active, so check IIIIIIUS's site before applying.
- **Does IIIIIIUS offer visa sponsorship?** This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on IIIIIIUS's site.
- **Where is this role located?** The listing gives the location as Madrid, Spain. It is marked on-site.
- **What skills does this role ask for?** The listing names: Data science, Statistics, Python, Impact evaluation, Causal analysis, Behavioural science, Machine learning, Generative AI, Exploratory data analysis, Statistical modelling, Feature construction, Difference-in-differences, Regression-based designs, Policy analysis, Technical communication, Quantitative analysis.

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