Recommended expert

Sebastian Kaczmarczyk

Alternative Data Analyst/Decision Scientist

Sebastian Kaczmarczyk
Warsaw, Poland

Experience

Jan 2025 - Present
1 year 1 month

Alternative Data Analyst/Decision Scientist

Balyasny Asset Management

  • Led the development of three internal data/AI products for Portfolio Manager teams, created PoCs, defined requirements, and coordinated engineering to deliver production-ready tools.
  • Owned relationships with hundreds of internal stakeholders, ensuring efficient data access, clear prioritization, and smooth collaboration across Tech, Data, and PM teams.
  • Managed a 7-person engineering team, overseeing sprint planning, resource allocation, and workflow optimization to remove bottlenecks.
  • Built several AI-driven utilities to enhance internal research and data handling efficiency.
Jan 2024 - Dec 2025
2 years

Senior Data Scientist

J.P. Morgan Chase

  • Worked closely with Marketing, Customer Experience, and Finance to turn business problems into clear technical requirements.
  • Delivered a customer experience chatbot using modern NLP/LLM approaches, improving internal support workflows.
  • Built multiple data-driven tools and analyses supporting European business units.
  • Collaborated with cross-functional partners to clarify needs, validate assumptions, and deploy solutions into day-to-day use.
Jan 2022 - Dec 2024
3 years

Senior Data Analyst

RTB House

  • Reduced Account Manager analysis workload by ~25% through process automation and improved reporting.
  • Designed an internal forecasting tool and built dashboards used across APAC stakeholders.
  • Led a project using NLP on customer audio/video interactions to flag churn risks, guiding AM teams toward retention opportunities.
  • Enhanced operational efficiency through systematic reporting and tool development.
Jan 2021 - Dec 2022
2 years

Business Analyst

Bain

  • Supported due diligence projects and operational improvements for clients.
  • Worked on UI/UX optimization and A/B testing initiatives.
  • Conducted analysis across customer behavior, segmentation, and product performance.
Jan 2020 - Dec 2021
2 years

Investment Analyst

Sunfish Partners

  • Conducted in-depth fundamental analysis of potential investments.
  • Tracked and managed deal flow pipeline.
  • Developed and implemented marketing strategies to enhance brand awareness, attract potential customers or investors, and increase market share.
Jan 2019 - Dec 2020
2 years

Funding Consultant

Grantland

  • Performed market and business-side analytics.
  • Led the development of comprehensive business plans, including defining business objectives, target markets, competitive strategies, and financial projections.

Summary

AI & data product leader with experience delivering products end-to-end in high-stakes financial environments. I combine technical understanding (LLMs, data pipelines, alt-data, cloud) with strong product ownership, cross-functional communication, and team leadership.

I’ve managed engineering teams, gathered requirements from senior investment professionals, built PoCs, and driven products from concept to production — improving workflows, reducing operational bottlenecks, and enabling revenue-generating insights.

I bring a mix that’s hard to find: I understand the technical side well enough to build prototypes and guide engineers, but I also think like an operator who cares about adoption, deadlines, and real impact. I’ve already shipped AI/data products in complex financial environments, managed teams, and worked with demanding stakeholders. I know how to turn a vague idea into a working solution, and I take full ownership from the first discussion to the moment a tool is actually used. If you need someone who can deliver fast, communicate clearly, and raise the bar for how product is run — that’s what I do best.

Skills

Core Skills

  • Product Ownership & Delivery
  • Stakeholder Management
  • Requirements Gathering
  • Team Leadership
  • Ai/llm Product Development
  • Data Products
  • Operational Efficiency
  • Cloud (Aws / Gcp)
  • Sql
  • Python

Tech Skills

  • Python
  • Git
  • Data Pipelines & Automation
  • Dashboarding (Tableau/ Looker)
  • Llms & Nlp

Languages

Polish
Native
English
Advanced
Spanish
Intermediate

Education

Oct 2022 - Jun 2024

Polish-Japanase Institute of Information Technology

MSc in Data Science · Data Science · Warsaw, Poland · 4.7/5

Oct 2020 - Jun 2022

Warsaw School of Economics (SGH)

MSc in Finance and Accounting · Finance and Accounting · Warsaw, Poland · 4.6/5

Oct 2017 - Jun 2020

The University of Sheffield

LLB Law · Law · Sheffield, United Kingdom · 1st Class Honours Degree

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