Senior Backend Engineer

Senior Backend Engineer (AI Fintech) Location Seoul, South Korea (On-site) About the Company A leading AI-driven wealth management fintech company in Korea is entering a critical growth phase as it prepares for global expansion beyond its current domestic market. The company is evolving toward a next-generation AI-powered investment platform focused on U.S. equities and ETFs, leveraging proprietary investment algorithms, data infrastructure, and automation capabilities. The organization is currently rebuilding its technology foundation to support scalable global growth. The Opportunity We are looking for a hands-on Backend Engineer who enjoys building scalable systems and bringing products to market. Unlike large organizations where engineers own only a small component, this role offers end-to-end ownership over backend services, infrastructure, APIs, data pipelines, and platform scalability. You will work closely with the Founder and product stakeholders while helping shape the technical foundation of a next-generation AI-powered fintech platform. This is primarily a builder role for engineers who enjoy creating, improving, and shipping products. Key Responsibilities Backend Product Development Design, develop, and maintain backend services and APIsBuild new customer-facing features and internal platform capabilitiesDevelop scalable systems supporting investment and portfolio management servicesSupport rapid experimentation and product iteration Platform & Architecture Design and improve backend architectureBuild and maintain REST APIs and microservicesImprove system performance, reliability, scalability, and securityParticipate in technical decision-making and platform modernization Data & Infrastructure Maintain cloud infrastructure and deployment environmentsDesign database schemas and optimize data processing workflowsSupport CI/CD and development automationImprove monitoring, observability, and system operations AI & Automation Integrate OpenAI, Claude, and other AI capabilities into products and operationsExplore AI-driven automation opportunitiesParticipate in AI-native product development initiatives Key Requirements 4+ years of software engineering experienceStrong backend development experienceExperience building and operating production systemsExperience developing APIs and data-driven servicesAbility to work independently with high ownershipStrong problem-solving skillsStartup, SaaS, Fintech, AI, or consumer platform experience preferred Preferred Experience Experience building products from 0→1 or scaling services from 1→10Experience supporting high-volume consumer-facing applicationsExperience working in startup or growth-stage environmentsInterest in AI, automation, and modern software development toolsProduct-oriented mindset and willingness to contribute beyond pure coding Technical Requirements Backend Node.jsNestJSGoPythonREST APIMicroservices ArchitectureDatabase PostgreSQLMySQLRedisInfrastructure AWSGCPDockerKubernetesTerraformDevOps CI/CDGitHub ActionsMonitoring & ObservabilityAI Technologies OpenAI APIClaude APIMCPAI AgentsCursorClaude Code Ideal Candidate Enjoys building products rather than managing large teamsTakes ownership and delivers resultsIs comfortable working in an evolving startup environmentLikes solving backend, infrastructure, and scalability challengesWants to help build a category-defining fintech platformBelieves in shipping fast, learning fast, and improving continuously Why Join? Direct collaboration with the Founder and leadership teamOpportunity to influence product and platform decisionsBuild technology that powers a real AI-driven investment productWork with modern AI development tools and technologiesSignificant ownership and visibilityOpportunity to grow into future Senior Engineer or Engineering Leadership positions as the organization scales Contact Jason Lee - Associate Director | JAC Recruitment Korea 📧 jason.lee@jac-recruitment.com 📞 +82-2-2183-0514