Role OverviewWe are looking for a Backend Tech Lead with deep banking and fintech experience to lead the development of next-generation financial platforms.This role blends technical leadership, hands-on engineering, and AI-native development practices, with a strong focus on building secure, scalable financial systems.Key ResponsibilitiesEngineering & ArchitectureDesign and implement robust banking APIs, financial microservices, and secure backend systems using Node.jsArchitect scalable, high-performance systems handling high-volume financial transactionsOwn the full backend lifecycle: design, development, optimization, monitoring, and scalingFinTech & IntegrationLead integrations with core banking systems, payment gateways, and financial platformsEnsure compliance with financial protocols and standards (ISO 20022, SWIFT, Open Banking APIs)Implement secure transaction flows, fraud detection mechanisms, and data validation pipelinesAI-Native DevelopmentLeverage tools such as Claude Code, Cursor, Windsurf, and similar to accelerate development velocityContribute to the evolution of our AI-native developer platform, influencing roadmap and featuresLeadership & CollaborationGuide and mentor backend engineers across multiple venturesCollaborate cross-functionally with frontend teams, product managers, and designers across Poland and Saudi ArabiaEstablish and enforce best practices in architecture, testing, security, and DevOps automationCandidate ProfileExperience & Expertise10+ years building production-grade backend systems, with significant experience in fintech or banking environmentsProven experience with:Core banking integrations and financial transaction processingPayment systems (Stripe, PayPal, Adyen)Regulatory frameworks (PCI DSS, PSD2, GDPR)Technical SkillsStrong expertise in Node.js and TypeScriptSolid experience with:Databases: PostgreSQL, MongoDB, RedisArchitectures: microservices, serverless, event-driven systemsCloud platforms: AWS, GCP, or AzureDeep understanding of:Secure coding practices and encryptionFinancial data security and complianceSystem scalability and performance optimizationAI & Development MindsetHands-on experience with AI-assisted coding tools (e.g., Claude Code)Strong inclination toward automation, productivity, and modern development workflowsSoft SkillsStrong communication skills in EnglishAbility to operate in fast-paced, multi-project environmentsHigh standards for code quality, testing, and system designExperience working in distributed, multicultural teams (Polish is a plus)Why Join RimthanAI-Centric Engineering CultureWork at the intersection of fintech and AIContribute to building tools that significantly enhance developer productivityTop-Tier ToolingAccess to premium AI development tools (Claude Code and others) for both professional and personal useFlexible Remote SetupFully remote role within EuropeFlexible working hours focused on outcomesVenture Builder EnvironmentExposure to multiple products and industriesAbility to shape new ventures from early stagesCompensation & BenefitsCompetitive B2B compensation aligned with experience20 days paid time off annuallyDedicated learning and development budgetGrowth & CultureContinuous learning through conferences, workshops, and internal hackathonsCollaborative, multicultural team focused on engineering excellence and knowledge sharing