Zefir is building an AI autopilot for home sales in Europe, starting in France: an AI agent runs the entire sale and purchase journey end-to-end, orchestrating local brokers, portals, buyers, and documents.
Backed by over $55 million from top-tier investors like Sequoia Capital, we're committed to accelerating life changes for millions of current and future European homeowners.
Most companies choose between growing fast and growing efficiently. Zefir does both: 3x YoY revenue growth while simultaneously driving acquisition costs down. That's not a fluke. It's the result of a data-obsessed culture, relentless funnel optimization, and a marketing engine that compounds every week.
This role is a key reason why that engine keeps compounding.
As our Data Analyst, you'll be the single source of analytical truth for everything that drives revenue on the marketing side. You'll turn complex, multi-source data into the sharp insights that let us scale 3x again next year without burning more cash to get there.
You'll sit at the intersection of Growth, Brand, and Product
You'll own the analytical layer behind a multi-million euro acquisition budget
You'll be the guardian of our data quality & robustness
You'll operate with high autonomy in a fast-moving Series B environment where your analyses directly shape budget decisions, campaign strategy, and roadmap priorities
If you want a role where your work visibly bends the growth curve, this is it.
Directly contribute to Zefir's unique trajectory of scaling revenue while improving unit economics by surfacing the insights that shift budget allocation, and build the weekly reporting cadence that keeps growth accountable
Play a key role in optimizing a multi-million euro acquisition budget: model channel interactions and saturation curves to identify diminishing-return channels early and reallocating spend toward compounding, high-efficiency loops
Own and continuously improve Zefir's lead scoring model, the backbone of all acquisition optimization. Define the variables that predict conversion, back-test against actual data, detect drift, and iterate so the score stays sharp as the business grows
Develop attribution models that reflect the real customer journey: go beyond last-click to understand how channels interact, identify the highest-quality traffic sources, and quantify the true cost of a qualified lead across an increasingly multi-touch funnel
Build the analytical layer that connects brand investment to performance outcomes: quantify how brand awareness campaigns influence downstream conversion rates, cost-per-lead, and lead quality
Uncover non-obvious patterns per persona : dig into how different seller and buyer profiles convert differently and identify how our current funnel should evolve towards maximum personalization to boost conversion on specific segments
Feed actionable cohort and segmentation insights back to CRM and Growth Ops teams so they can sharpen targeting, timing, and personalization in their own workflows
Build market intelligence loops: monitor real estate market signals and trends and surface insights that sharpen Zefir's messaging and positioning strategy
At Zefir, everyone touches data: your job isn't to be the only one who reads dashboards, it's to make sure the dashboards are worth reading by keeping the underlying definitions airtight and the data pipelines reliable
Own the marketing tracking infrastructure: implement, audit, and maintain event tracking across website, CRM, and ad platforms (GA4, GTM, Meta CAPI, Customer.io…), ensuring every critical user interaction is captured accurately and consistently
Build and maintain clean & robust data pipelines: design ETL workflows that consolidate data from acquisition platforms, CRM, product analytics, and internal tools into a single source of truth
Leverage AI to eliminate repetitive analytical work and free up time for high-impact thinking. You won't just use AI as a buzzword: you'll ship concrete automations that make the team faster and sharper every week
Eg. automated reporting that deliver ready-to-act insights without manual intervention, automated creative tagging (classifying hundreds of ad variants by visual and copy attributes without manual labelling), auto-detection of data quality issues, or smart alert systems that surface early signals of performance shifts before anyone has to ask
5-7 years in Data Analytics within a high-growth tech environment
You've operated in a context where speed matters as much as precision, and you know how to calibrate both, ideally in a Series A–C startup
You understand how marketing data connects to revenue, and you prioritize work based on business impact, not technical elegance
You're comfortable challenging assumptions and love to be at the heart of the reactor, directly influencing revenue outcomes through concrete, data-driven recommendations
Builder mindset & ****autonomy ****: You thrive where the playbook doesn't exist yet: you ship fast, iterate, and don't wait for perfect data to start generating value and you’re not afraid to be hands-on.
Deep SQL & data modeling fluency. Python is a plus.
Experience with Fivetran, dbt, Airflow or equivalent transformation tools.
Hands-on experience implementing and debugging tracking setups across GA4, Google Tag Manager, pixel-based tracking, cookies, server-side APIs (e.g. CAPI), and CRM event tracking
AI-curious & automation-oriented : Hands-on experience leveraging AI and low-code tools to accelerate your own workflows: LLMs for data exploration, automated QA checks, lightweight internal tools
Competitive salary: You can run your own simulation with our salary calculator.
BSPCE (Stock Options): Available for everyone, with monthly vesting after year one, over a 4-year period.
Healthcare plan: Full coverage with Alan for team members, their partners, and children.
Office in Le Peletier, Paris (9th arrondissement): With flexible remote work options.
Swile meal card: €11 per worked day.
Swile mobility card: €42/month to support sustainable transportation (metro, carpooling, biking…).
Team events: Monthly Mixers to connect and share good times, and quarterly All Hands to celebrate wins across the company.
🏔️ Steep Mountains Are Steep: Setting ambitious goals and working hard to achieve them.
🌊 Ride Reality: Actively seeking challenges an
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