Senior Full-stack Developer (C#, .NET Core, React)

SmartDev is an AI-powered software development company headquartered in Vietnam, part of the Verysell Group. We help global businesses deliver faster and build smarter — combining AI-driven development practices with deep expertise across fintech, healthcare, retail, and enterprise technology. Our team of engineers, architects, and AI specialists works across the full stack: from custom software and cloud solutions to generative AI, MLOps, and intelligent automation. At SmartDev, we believe that great architecture and AI-first thinking are a competitive advantage — and we build our teams accordingly.  The company is at a pivotal point in our journey: transitioning from a pure IT outsourcing provider to an AI-enabled solutions partner.  We have over 200 talented employees working both on-site and remote/hybrid at locations:  - Hanoi: Zodiac building, 19 Duy Tan Street, Dich Vong Hau ward, Cau Giay District, Hanoi  - Danang: 81 Quang Trung, Hai Chau 1 ward, Hai Chau District, Danang  As a Senior Full-Stack Engineer, you will be responsible for the end-to-end delivery of high quality applications. You will apply your deep expertise to define architectural blueprints and develop viable solution options, ensuring they align with defined functional and non-functional requirements. You will play a key role in governance and quality control, actively guiding peers on best practices, and ensuring robust technical planning. Crucially, you will collaborate directly with other cross-functional technology teams to ensure smooth integration and deployment of full-stack solutions. Key Responsibilities: - Drive Technical Excellence by architecting, building, enhancing, and maintaining complex full-stack applications while proactively evaluating and integrating new technologies. - Ensure Code Quality and Stability through rigorous code reviews and maintaining a stable, high-performance development and deployment environment. - Full-Cycle Ownership including the analysis of business objectives to define and refine detailed functional and non-functional requirements. - Design and Implement end-to-end technical solutions for both functional and non functional needs, focusing on scalability, security, and performance. - Develop and Deploy high-quality, production-ready software solutions with comprehensive test coverage and minimal supervision. - Master Cloud Architecture by designing and implementing low-latency, high-availability, and fault-tolerant applications within the AWS ecosystem, leveraging technologies like C#, .NET Core, Node.js, and React. - Establish DevOps Pipelines by setting up and managing critical AWS resources, automating processes via CI/CD, and utilizing Infrastructure as Code (IaC) principles. - Mentor and Elevate junior and mid-level engineers by providing technical guidance, code assistance, and actively fostering their growth. - Champion Collaboration by working proactively as part of a highly collaborative Agile team, supporting shared goals and influencing technical direction. - Communicate and Influence clearly and effectively across technical and non-technical audiences, articulating insights, technical plans, and ideas to cross-functional teams and management. - Own the Service Lifecycle (Build it, Own it, Run it) by taking end-to-end responsibility for the reliability, monitoring, and operational health of deployed services. - Strong proficiency with the following languages C#, .NET core, React. - 6+ years of experience in the IT industry, including at least 2 years delivering distributed solutions. - Good knowledge of Microservices architecture and RESTful APIs - Ability to design and build API-based and distributed, cloud-native solutions with AWS - Experience working with RDBMS (Postgres or SQL Server) - Experience working with automated testing frameworks - Experience working with performance test automation tools - Strong understanding of best practises, design patterns and standards - Understanding fundamental design principles behind a scalable application - Risk management and incident management knowledge. - Working knowledge of front-end technologies, such as HTML5 and CSS3 and React. - Understanding accessibility and security compliance. - User authentication and authorization between multiple systems, servers, and environments. - Proficient understanding of code versioning tools, such as Git. - AWS certifications (nice to have) Benefits: - International working environment with AI-driven strategic direction. - 20 days of annual leave – Hybrid working mode. - Premium healthcare package with PVI and comprehensive annual health check-ups - Competitive salary & 13th salary bonus - Lunch allowance to fuel your productivity. - Engaging company culture with fun activities - Global collaboration – Work with both Vietnamese and international colleagues.