Fintech Interest & Product Rules Specialist

TF Bank AB; Borås kommun; Hybrid; SEK 700,000 - 900,000; Full time

Job summary

TF Bank AB is seeking a specialist for the Core Ledger team to define and document business rules behind interest, fees, and product configurations while verifying and testing supplier deliveries. You will support colleagues across finance and product, ensuring accuracy and regulatory alignment.

In a hands-on, collaborative environment, you will translate business requirements into precise specifications and execute tests to ensure correct behavior across instruments.

Qualifications

• 4+ years in a financial, analytical, or product role within financial services, lending, or payments.
• Understanding of interest calculation methodologies (effective rate, simple interest, compound interest, XIRR).
• Experience writing detailed financial business rules and specifications for systems built by others.
• Knowledge of consumer credit products like BNPL or instalment lending.

Responsibilities

• Define and document requirements for interest calculation logic and fee structures to be delivered by suppliers.
• Translate requirements into precise specifications for external suppliers.
• Verify and test supplier-delivered product configurations for financial instruments.
• Ensure correctness of calculation logic, including edge cases and regulatory requirements.
• Collaborate with finance, compliance, and product teams to validate supplier deliveries.
• Support audit and regulatory reporting with transparent, traceable calculations.
• Investigate discrepancies in interest calculations or fees with suppliers.
• Define and execute test cases for financial calculation logic.
• Provide hands-on internal support on interest, fees, and product behavior.

Skills

Interest calculations

Financial rules specs

Product knowledge

Financial services

Complex financial specs

Education

BSc/MSc CS or SWE

Job description

TF Bank AB is seeking a specialist for the Core Ledger team to define and document business rules behind interest, fees, and product configurations while verifying and testing supplier deliveries. You will support colleagues across finance and product, ensuring accuracy and regulatory alignment.

In a hands-on, collaborative environment, you will translate business requirements into precise specifications and execute tests to ensure correct behavior across instruments.