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About the Role

Vinted's Revenue domain is seeking a Lead Data Scientist to join their Ads team. This role will focus on developing an advertising ecosystem within Vinted, optimizing real estate, and evolving towards a high-performance, privacy-respectful, in-house advertising system. The position is ideal for someone who has built performance-first Ad optimization systems and is ready for hands-on work while shaping Data Science roadmaps from the ground up.

Responsibilities

Own optimization logic for Ads systems, including ranking, targeting, pacing, budget allocation, candidate selection, and auction or bidding logic.
Develop practical approaches to improve advertiser performance, marketplace relevance, and business outcomes.
Design, develop, and iterate models and algorithmic approaches for Ads delivery and optimization, including prediction, scoring, calibration, exploration/exploitation methods, and constrained optimization.
Own the analytical and experimental process for improving optimization systems, defining hypotheses, evaluation frameworks, and translating learnings into system improvements.
Help define optimization objectives that balance advertiser value, revenue, user experience, and operational constraints.
Own deep-dive analysis of system behavior and performance degradation, identifying limiting factors and proposing solutions.
Partner with engineering and Decision Scientists to implement models and optimization logic.
Collaborate with Product Managers, Decision Scientists, Analytics Engineers, and developers to shape advertiser-facing features and internal optimization capabilities.
Ensure optimization changes are evaluated with appropriate metrics, guardrails, and marketplace context.
Partner with Analytics Engineering, Data Engineering, and backend teams to ensure data suitability for robust optimization work.
Explain system behavior, performance drivers, and expected impacts of optimization changes to non-technical stakeholders.

Requirements

Strong applied machine learning and statistical skills.
Experience with Ad Tech systems and optimization problems.
Strong product and business judgment.
Comfort working on production systems with engineers.
Ability to operate effectively in ambiguous, evolving domains.
Experience in ads ranking, auction systems, pacing and budget optimization, marketplace or recommendation systems, relevance modeling, or other real-time optimization environments.
Well-versed in Python and SQL.
Structured, meticulous way of working.
Conscious team player who proactively aligns with others.
Ability to explain machine learning methods to lay audiences.
Solid written and spoken English.

Skills

Machine Learning
Statistical Analysis
Ad Tech
Optimization
Python
SQL
BigQuery

Location

Vilnius

Work Type

Hybrid

Experience Level

Lead

Salary/Compensations

€90.100—€132.500 EUR

Benefits

Share options programme
30 days of paid annual leave
Newest MacBook models
Digital mental and emotional health support and Employee Assistant Program (EAP)
Home office support (IT workstation equipment and a personal budget of up to €540 for home workplace furniture)
Lunch benefit per workday
Frequent team-building events
Personal monthly budget for shopping on Vinted
Access to a discounted gym membership plan
Pension Plan with Vinted matching 150% of your chosen contribution
Supplemental Private Health Insurance
Life and Disability insurance
Subsidised Deutschlandticket for commute
Up to 90 days per year on workation (21 of which can be spent working outside of the EU)
Dog-friendly office
Individual Learning Budget

About the Company

Vinted's mission is to make second-hand the first choice.
Vinted Marketplace is Europe’s leading platform for second-hand fashion.
Vinted Go enhances the shipping experience with a vast network of pick-up and drop-off points.
Vinted Pay provides secure, reliable payments to buyers and sellers across Europe.
Founded in 2008 in Lithuania, Vinted became Lithuania's first unicorn in 2019.
Headquarters remain in Vilnius, with offices across Europe and a team of over 2,000 people.

Equal Opportunity

The Vinted Group is committed to building an inclusive workplace where people from all walks of life feel a sense of belonging.
We welcome applications from people of all backgrounds, identities and life experiences.
All applicants are treated fairly without regard to their race, age, religion or belief, sex, national origin, citizenship, gender identity, sexual orientation, disability, or any other protected characteristic.