We are looking for a specialist who combines financial know-how with strong analytical skills to join our Core Ledger team. Our platform contain core ledger systems both fully developed internaly and developed and delivered by external suppliers. As an Interest & Product Logic Specialist, you will define and document the business rules behind interest, fees, and product configurations, and verify and test that what our internal- and external suppliers deliver matches our requirements and works correctly. A significant part of this role is providing hands‑on internal support to colleagues across the business who have questions about interest, fees, and product behaviour — this is something all specialists in the team spend a lot of time on. Getting this right is essential — it directly affects how accurate and competitive our financial products are. You will join a small, close-knit team and have a great opportunity to make a direct impact early on and help shape it as it grows.Key ResponsibilitiesDefine and document detailed requirements for interest calculation logic, accrual rules, and fee structures, to be delivered by external suppliersTranslate financial product requirements from business and product teams into precise specifications for our suppliersVerify and test the product configuration delivered by suppliers, ensuring it behaves correctly for all financial instrumentsEnsure the mathematical and financial correctness of calculation logic delivered, including edge cases and regulatory requirementsCollaborate with finance, compliance,



and product teams to validate that supplier deliveries meet business intentSupport audit and regulatory reporting by ensuring calculation logic is transparent, traceable, and well‑documentedInvestigate and resolve discrepancies in interest calculations, fee postings, or product behaviour, working with suppliers when neededDefine and execute test cases for financial calculation logic, including boundary and regression testsProvide hands‑on internal support to other teams (finance, customer service, operations, and others) on questions about interest, fees, and product behaviour — this is a significant and ongoing part of the roleQualifications and ExperienceDesired Skills4+ years of experience in a financial, analytical, or product role within financial services, lending, or paymentsStrong understanding of interest calculation methodologies (e.g. effective interest rate, simple interest, compound interest, XIRR)Experience writing detailed financial business rules and specifications for systems built by othersSolid grasp of product structures in consumer credit, BNPL,



or instalment lendingAbility to work with complex financial specifications and verify that delivered systems implement them correctlyNice to HaveKnowledge of Nordic or European consumer credit regulation (e.g. Consumer Credit Directive)Experience with configuration-driven financial product frameworks delivered by suppliersBackground in actuarial science, quantitative finance, or financial mathematicsFamiliarity with accounting principles as they relate to interest and fee recognitionBehavioursExceptional analytical rigour — comfortable with mathematical precision and financial logicService‑minded and approachable — enjoys helping colleagues understand interest, fee, and product logicStrong bridge‑builder between finance/business language and supplier requirementsThorough documenter — understands that correctness must be explainable and auditableCurious and proactive in challenging assumptions and validating requirementsCollaborative, with an ability to work effectively with business stakeholders and external suppliersEducationBSc or MSc in Computer Science, Software Engineering, or equivalent practical experience.LanguagesFluent English is required for this role. Swedish language is a plus.What We OfferA key role in building and shaping a modern, cloud‑native core ledger platformA collaborative, cross‑functional team environment with short decision pathsCompetitive salary and benefits packageFlexible working arrangements with hybrid optionsOpportunities for professional development and continuous learningA chance to make a real impact in the fintech space across the Nordic marketModern office in central Málaga with a strong team culture
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📌 Interest & Product Logic Specialist · Málaga ·
🏢 TF Bank
📍 Málaga