Full-Stack Developer

Overview: We are looking for an experienced Full-Stack Developer to join our technology team and contribute to the design, development and maintenance of enterprise web, backend and mobile applications, with a strong focus on developing a new Point of Sale (POS) platform. The successful candidate will be responsible for delivering end-to-end solutions across frontend, backend and database layers, including in-store and mobile checkout systems integrated with payment providers and card-acceptance hardware. This role requires strong expertise in C#/.NET, React, TypeScript, SQL and modern software engineering practices, along with the ability to build secure, scalable and reliable applications. Experience in POS systems, payment integrations and AI-assisted development workflows is particularly important. Duties & Responsibilities: • Design, develop, test and maintain enterprise web applications, REST APIs, real-time services and mobile applications. • Deliver end-to-end features across frontend, backend and database layers, ensuring quality through automated testing. • Develop and enhance POS functionality, including 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-based Tap to Pay solutions. • Design secure and reliable payment flows, including transaction handling, timeout management, reversals, duplicate-charge prevention and settlement reconciliation. • Integrate POS hardware, including Android terminals, receipt printers, barcode scanners, cash drawers, customer displays and other peripherals. • Develop offline-capable checkout solutions with reliable transaction synchronisation when connectivity is restored. • Build and optimise scalable backend services, APIs and SQL databases to support high-volume transactions. • Develop responsive frontend applications using React, TypeScript and modern UI frameworks. • Implement and maintain integrations with external systems, ensuring reliable data exchange, error handling and recovery mechanisms. • Apply secure coding practices, including role-based access control, audit logging, secrets management and secure authentication. • Maintain CI/CD pipelines and support application deployment, monitoring, troubleshooting and production stability. • Collaborate on system architecture, technical specifications, documentation and code reviews. • Utilise AI-assisted development tools to accelerate delivery while maintaining code quality, security and accountability. • Participate in technical discussions and continuously improve development standards, testing practices and system performance. Job Specifications • Minimum 4+ years of experience developing production-grade full-stack applications. • Strong experience in C#/.NET, ASP.NET Core Web API, Entity Framework Core and REST API development. • Strong proficiency in React, TypeScript, JavaScript and modern frontend development frameworks. • The JD specifies 5+ years of experience with .NET and 5+ years with modern React. • Experience with SQL Server and PostgreSQL, including database design, query optimisation, indexing and performance tuning. • Knowledge of Redis, real-time services, SignalR/WebSockets and background processing. • Experience with payment gateway integrations, POS systems, retail technology or financial transaction processing is strongly preferred. • Familiarity with card-present payment terminals, payment APIs, refunds, reversals, tokenisation and settlement reconciliation. • Working knowledge of PCI DSS principles and secure payment architecture. • Experience integrating POS hardware, including Android payment terminals, receipt printers, barcode scanners and peripheral devices, is an advantage. • Android development experience using Kotlin, Jetpack Compose and offline-first application architecture is preferred. • Experience with Microsoft Azure, Azure DevOps, Git and CI/CD pipelines. • Knowledge of automated testing frameworks, secure coding standards, monitoring and observability tools. • Practical experience using AI-assisted development tools, such as Claude Code, Cursor or GitHub Copilot, within structured engineering workflows. • Ability to develop clear technical specifications, critically review AI-generated code and maintain ownership of final deliverables. • Strong analytical thinking, problem-solving skills and attention to detail. • Excellent communication, collaboration and technical documentation skills. • Bachelor's degree in Computer Science or a related discipline, or equivalent practical experience.