Data Scientist

Solid commercial data science experience — typically 3–5 years, with a track record of shipping models into production

Strong ML knowledge across multiple algorithm families, and the judgement to pick the right approach for the problem rather than the one you know best

Strong Python and SQL, with the ability to lead on production-level code and set the standard others work to

Able to debug and resolve issues independently across unfamiliar repositories, using AI tooling to accelerate rather than to guess, while still understanding the problem fully

Strong AI fluency — you solve tickets quickly with it, you unblock cross-department dependencies with it, you build automation workflows with it, and you never send AI-assisted output without checking it

Confident, independent communication with clients and stakeholders as the technical authority on the work

Emerging mentorship — you're ready to develop junior colleagues, and you want to

Initiative in accepting and planning your own work, rather than waiting to be allocated it

Genuine attention to detail — much of this work involves noticing when a number is wrong

Bayesian modelling experience, particularly hierarchical models

Experience with AWS or comparable cloud tooling

Familiarity with automated QA tooling and test coverage practices

Experience with marketing, ecommerce, or advertising data

Experience with attribution methodology, MMM, incrementality testing, or Bayesian modelling is genuinely an advantage at this level — but it isn't a filter. Our stack takes time to learn regardless of what you arrive with, and we'd rather hire strong modelling judgement and teach the domain.

How you'll grow

We run a published Data Science Career Development Framework with six levels. You'd join at Career, where the expectations are:

AI Fluency & Tooling: Leverages AI to solve coding tickets quickly; consistently unblocks themselves on cross-department dependencies, especially product and engineering; never sends AI-assisted communication without checking quality; expert at using AI to build automation workflows.

Machine Learning & Modelling: Strong ML knowledge across multiple algorithm families; independently chooses and applies the right modelling approach within Fospha's suite.

Engineering & Codebase: Leads on larger coding projects and tickets with production-level code; resolves queries and bugs efficiently and independently; master at using supplied AWS tooling through AI; uses automated QA tools efficiently and flags gaps to the QA team.

Stakeholder & Communication: Confidently and independently communicates with clients and colleagues as a modelling expert; assists with the development of junior members of staff.

Job Complexity: Consistent contributor and respected knowledge holder, with emerging collaboration and mentorship abilities.

Supervision: Demonstrates initiative in accepting and planning work.

Progression to Advanced level is against explicit, published criteria — taking on almost any ticket efficiently, building and planning production repositories, collaborating with product on project outcomes and estimates, actively developing junior colleagues, and representing Fospha as a trusted external voice on modelling in senior client and partner conversations. You'll know what you're working towards from your first week.

Throughout, we look for the same core behaviours: concise communication, collaboration, problem solving, critical thinking, growth mindset, attention to detail, time management, and initiative.

Real methodological depth. Bayesian attribution, MMM, geo lift testing, and causal inference are our day job, not a side project. You'll be working on all of it, not adjacent to it.

Ownership at the methodology level. At this level you're choosing the approach, not implementing someone else's choice.

Published career framework. No guessing what the next level requires or when you'll get there.

A team that reviews each other's work properly. Code review and methodology critique from people who care about getting the model right.

Direct client impact. The models you build and maintain drive real budget decisions at brands you'll recognise.