Full-Stack Developer

Role overview

Duties and responsibilities

• Design, develop, test, and maintain enterprise web applications, REST APIs, real-time services, and mobile applications.
• Deliver end-to-end frontend, backend, and database features, with quality supported by automated testing.
• Build POS features for cart management, pricing, discounts, promotions, VAT, split payments, refunds, voids, cash management, and end-of-day reconciliation.
• Integrate payment gateways, acquirers, card terminals, digital wallets, and Android Tap to Pay solutions.
• Design reliable payment flows covering transaction handling, timeouts, reversals, duplicate-charge prevention, and settlement reconciliation.
• Integrate Android terminals, receipt printers, barcode scanners, cash drawers, customer displays, and other POS peripherals.
• Develop offline checkout and synchronize transactions when connectivity returns.
• Build scalable backend services, APIs, and SQL databases for high-volume transactions.
• Develop responsive frontend applications with React, TypeScript, and modern UI frameworks.
• Maintain external integrations with reliable data exchange, error handling, and recovery.
• Apply role-based access control, audit logging, secrets management, and secure authentication.
• Maintain CI/CD pipelines and support deployment, monitoring, troubleshooting, and production stability.

Experience and technical requirements

• At least 4 years of experience developing production-grade full-stack applications.
• Strong experience with C#/.NET, ASP.NET Core Web API, Entity Framework Core, and REST API development.
• Strong proficiency in React, TypeScript, JavaScript, and modern frontend frameworks.
• The description also specifies 5+ years of experience with .NET and 5+ years with modern React.
• Experience with SQL Server and PostgreSQL, including database design, query optimization, indexing, and performance tuning.
• Knowledge of Redis, real-time services, SignalR/WebSockets, and background processing.
• Familiarity with payment terminals, payment APIs, refunds, reversals, tokenization, and settlement reconciliation.
• Working knowledge of PCI DSS principles and secure payment architecture.
• Experience with Azure, Azure DevOps, Git, CI/CD, automated testing, secure coding, monitoring, and observability.
• Practical experience with AI-assisted development tools and ability to review AI-generated code and own final deliverables.
• Strong analytical thinking, problem-solving, attention to detail, communication, collaboration, and technical documentation skills.
• Bachelor’s degree in Computer Science or a related discipline, or equivalent practical experience.

Preferred experience

• Payment gateway integrations, POS systems, retail technology, or financial transaction processing are strongly preferred.
• Experience integrating POS hardware is an advantage.
• Android development using Kotlin, Jetpack Compose, and offline-first architecture is preferred.
• The description names Claude Code, Cursor, and GitHub Copilot as examples of AI-assisted development tools.