Bunyad A

Senior Software Developer

ITT • Fulltime

Mar 2023 - Jul 2026 • 3 yrs 4 mos

Led backend development for enterprise-grade CRM, ERP, payment, and business management platforms using Go (Golang), .NET Core, PostgreSQL, and Vue.js. Designed and delivered scalable, secure, and maintainable backend systems, with a strong focus on distributed architectures, payment infrastructure, system integrations, performance, and reliability. ### Key Responsibilities & Achievements • Developed scalable backend services and microservices using **Go (Golang), .NET Core, PostgreSQL, SQL, and Bun ORM**. • Designed and implemented **RESTful APIs**, database schemas, service integrations, and complex business workflows following **Clean Architecture, Domain-Driven Design (DDD), SOLID principles, and common design patterns**. • Designed **microservice and distributed system architectures**, including service-to-service communication, API Gateway / reverse proxy layers, and event-driven workflows. • Developed enterprise **CRM and ERP modules** covering payment processing, recurring/subscription billing, inventory management, approval workflows, accounting, donation management, sponsorship management, and reporting. • Built **event-driven and asynchronous processing systems with RabbitMQ**, including queues, background workers, message consumers, and reliable message processing. • Implemented distributed-system reliability patterns including **Outbox Pattern, Saga Pattern, idempotency, retries with backoff, circuit breakers, and fault-tolerant webhook processing**. • Integrated payment providers including **Craftgate, Stripe, and Kuveyt Türk Virtual POS**, covering payment flows, recurring payments, callbacks/webhooks, transaction status management, and duplicate-payment prevention. • Developed accounting and ERP integrations with **Mikro ERP** and other external systems. • Implemented secure **authentication and authorization** solutions using **Keycloak, OAuth 2.0, SSO, JWT, and role-based access control (RBAC)**. • Optimized **PostgreSQL database models,