Full-Stack Developer

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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 & 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.