Eren L.

Building a product with complex payments, user roles, or business workflows? I turn those requirements into a working system—designing the backend architecture, APIs, database, and web application from the ground up, so you can launch with a foundation built to grow. I work with founders and teams to define how a product should work, design its core services and data model, and build the backend and connected applications. My focus is turning business requirements into complete product workflows. WHAT I BUILD • Backend architecture, REST APIs, databases, authentication, and role-based permissions • Payment integrations, financial ledgers, transaction flows, and reward or commission logic • Admin dashboards, customer portals, and connected web and mobile applications • Background jobs, caching, real-time features, and third-party service integrations RECENT PROJECT EXPERIENCE • Utopia / OASIS — Backend architecture and financial services for a gaming platform, including ledger and transaction flows, payment and withdrawal integrations, KYC, and game-provider integrations. • BestPrime — Backend and backoffice workflows for order management, payments, customer and sales-partner operations, referrals, family accounts, and reward calculations across web and mobile. • ePOINT — A cashback and loyalty platform with customer, dealer, and sales-representative roles, QR transactions, receipt OCR, payment integrations, and commission logic. • DLS — Rewards and redemption workflows, financial ledger services, BTC redemption records, and administrative interfaces. HOW I WORK We start with your product goals, user journeys, and business rules. I translate them into an architecture and delivery plan, then implement the system in clear milestones with testing, documentation, and regular communication. CORE STACK NestJS, Node.js, TypeScript, PostgreSQL, MongoDB, Redis, React, Next.js, and React Native. I also bring blockchain integration experience when the product calls for it. Tell me what you’re building, who will use it, and the core workflows you need. We can map out the system and a practical path to launch.