Fintech Financial Data Scientist: Ledger & Modeling

Twinco Capital; Alcobendas; On-site; EUR 65,000 - 95,000; Full time

Job summary

Twinco Capital is seeking a Financial Data Scientist in Madrid, Spain. You will own and evolve the core accounting ledger, directly updating Python code to reflect new business rules and events.

The role interacts with data engineers and stakeholders across finance, risk, and operations to ensure accurate financial reporting and robust data-driven insights. Strong accounting fundamentals, Python fluency, and proficiency in data tooling are essential to translate business changes into structured

Qualifications

• Degree in Economics, Finance, or Accounting with postgraduate training in Data Science or quantitative methods.
• Solid understanding of double-entry bookkeeping.
• Fluent Spanish and English is required.

Responsibilities

• Own the functional understanding of Twinco's accounting ledger — the single source of truth for all transactional data in the company.
• Directly modify the ledger's Python codebase to implement changes in business rules, add new event handlers, adjust account mappings, or correct existing logic.
• Validate ledger outputs and investigate discrepancies — ensuring double-entry integrity, accurate balances, and traceability from reported figures back to source events.
• Understand how downstream processes (financial reporting, KPI dashboards, risk models, investor reporting) consume ledger data, and ensure changes are consistent with their needs.
• Collaborate with the data engineering team to define and communicate changes that require deeper technical work (pipeline architecture, Spark optimisation, infrastructure).
• Work with stakeholders across the business — finance, operations, risk — to understand new products, changing commercial terms, or evolving workflows, and assess their impact on the ledger structure.
• Document accounting rules and business logic decisions; write and maintain tests to ensure ledger accuracy across edge cases.

Skills

Double-entry bookkeeping

Python

Analytical thinking

Problem solving

Spanish and English

Attention to detail

Education

Economics/Finance/Accounting degree

Data Science/Quantitative postgraduate training

Tools

SQL

dbt

PySpark

Git

Job description

Twinco Capital is seeking a Financial Data Scientist in Madrid, Spain. You will own and evolve the core accounting ledger, directly updating Python code to reflect new business rules and events.

The role interacts with data engineers and stakeholders across finance, risk, and operations to ensure accurate financial reporting and robust data-driven insights. Strong accounting fundamentals, Python fluency, and proficiency in data tooling are essential to translate business changes into structured