Junior Data Scientist

Location: London, United Kingdom

Company

hirify.global builds marketing measurement products for ecommerce brands, including attribution, marketing mix modelling, incrementality testing, and brand impact measurement.

What you will do

• Own moderately difficult tickets from analytical investigations and model backtesting to production bug fixes and pipeline work.
• Systematically debug partly unfamiliar codebases using AI tooling to accelerate investigations.
• Write and review production Python and SQL while avoiding technical debt.
• Use QA automation and AWS data science pipeline tooling effectively.
• Explain methodology and findings to clients and colleagues.
• Clarify acceptance criteria and become an internal data science contact for owned areas.

Requirements

• 1–2 years of commercial data science experience or a strong placement/internship record alongside a quantitative degree.
• Strong Python and SQL skills with experience collaborating on shared code.
• Deep knowledge of several machine learning algorithms and when to apply them.
• Ability to systematically debug unfamiliar code and independently complete scoped work.
• Strong AI fluency, including reviewing AI output for accuracy and brevity.
• Clear communication, attention to detail, critical thinking, and initiative.

Nice to have

• Experience with AWS or comparable cloud tooling.
• Familiarity with automated QA tooling and test coverage practices.
• Experience with marketing, ecommerce, or advertising data.
• Exposure to Bayesian methods, marketing mix modelling, or experimental design.

Culture & Benefits

• Published six-level Data Science Career Development Framework with explicit progression criteria.
• Regular code review and methodology critique focused on model quality.
• Supportive team structure with progressively increasing ownership.
• Direct impact on budget decisions through models used by recognizable brands.