This position is posted by Jobgether on behalf of Sift. We are currently looking for a Senior Data Scientist in Ukraine or Poland.

Join a high-impact team at the forefront of AI innovation, tackling real-world fraud and trust challenges across the digital economy. In this role, you’ll prototype intelligent systems, explore generative AI use cases, and lead the development of advanced machine learning models. Working cross-functionally with engineering and product teams, you’ll build scalable, real-time solutions that detect and prevent fraudulent activity. You’ll also mentor junior team members and help define the future of data science within a collaborative, remote-first environment.

Accountabilities:

• Design and conduct hypothesis-driven experiments and offline simulations to validate product and model effectiveness.
• Develop and prototype cutting-edge machine learning models and generative AI tools to detect fraud and abusive behavior.
• Investigate adversarial behavior and create robust defenses against evolving threats.
• Collaborate with engineering, product, design, and customer teams to integrate data science solutions into production systems.
• Mentor junior data scientists and promote best practices in experimentation, modeling, and operationalization.

Requirements

• 5+ years of experience in data science or a related role, ideally in a tech-driven environment.
• Strong proficiency in Python and SQL, with experience using big data tools like Spark and Snowflake.
• Expertise in machine learning techniques, experimentation, and production-level deployment.
• Experience analyzing structured or sequential data, especially from user activity logs.
• Skilled in communicating complex technical concepts to diverse audiences.
• Self-starter with strong prioritization skills and comfort with ambiguity.
• Bonus: background in Trust & Safety, deep learning (LLMs, GenAI, prompt engineering), or experience with real-time prediction systems.
• Advanced degree (MS or PhD) in a quantitative field is a plus.

Benefits

• Competitive compensation including an annual 5% bonus and stock options.
• Health insurance stipend to cover medical expenses.
• Sports & wellness stipend to support a healthy lifestyle.
• Work-from-home stipend for your office setup.
• Education reimbursement for courses, books, and conferences.
• Mental health days to support your well-being.
• English courses and public speaking support to boost communication skills.

Jobgether is a Talent Matching Platform that partners with companies worldwide to efficiently connect top talent with the right opportunities through AI-driven job matching.
When you apply, your profile goes through our AI-powered screening process designed to identify top talent efficiently and fairly.

🔍 Our AI evaluates your CV and LinkedIn profile thoroughly, analyzing your skills, experience and achievements.
📊 It compares your profile to the job’s core requirements and past success factors to determine your match score.
🎯 Based on this analysis, we automatically shortlist the 3 candidates with the highest match to the role.
🧠 When necessary, our human team may perform an additional manual review to ensure no strong profile is missed.

The process is transparent, skills-based, and free of bias — focusing solely on your fit for the role. Once the shortlist is completed, we share it directly with the company that owns the job opening. The final decision and next steps (such as interviews or additional assessments) are then made by their internal hiring team.

Thank you for your interest!

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