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

Company Description

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 

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 

Job Description

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.

Qualifications

• 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)

Additional Information

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.