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

Smart. Dev 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 Smart. Dev, 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 Se nior 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.