Sebastian Kaczmarczyk
Alternative Data Analyst/Decision Scientist
Experience
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.
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.
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.
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.
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.
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.
Industries Experience
See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.
Experienced in Banking and Finance (4 years), Professional Services (4 years), Advertising (3 years), and Information Technology (3 years).
Business Areas Experience
The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.
Experienced in Business Intelligence (7 years), Product Development (5 years), Project Management (4 years), Customer Service (2 years), Information Technology (2 years), and Operations (2 years).
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
Education
Polish-Japanase Institute of Information Technology
MSc in Data Science · Data Science · Warsaw, Poland · 4.7/5
Warsaw School of Economics (SGH)
MSc in Finance and Accounting · Finance and Accounting · Warsaw, Poland · 4.6/5
The University of Sheffield
LLB Law · Law · Sheffield, United Kingdom · 1st Class Honours Degree
Profile
Frequently asked questions
Do you have questions? Here you can find further information.
Where is Sebastian based?
What languages does Sebastian speak?
How many years of experience does Sebastian have?
What roles would Sebastian be best suited for?
What is Sebastian's latest experience?
What companies has Sebastian worked for in recent years?
Which industries is Sebastian most experienced in?
Which business areas is Sebastian most experienced in?
Which industries has Sebastian worked in recently?
Which business areas has Sebastian worked in recently?
What is Sebastian's education?
What is the availability of Sebastian?
What is the rate of Sebastian?
How to hire Sebastian?
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
Similar Freelancers
Discover other experts with similar qualifications and experience
Experts recently working on similar projects
Freelancers with hands-on experience in comparable project as a Alternative Data Analyst/Decision Scientist
Nearby freelancers
Professionals working in or nearby Warsaw, Poland
