Senior Fullstack Engineer (.NET & React)

What you'll do

• Design and build scalable, secure, and high-performance applications using C#/.NET 8, React, TypeScript, EF Core, and PostgreSQL or SQL Server.
• Lead architectural design and technical decisions, applying Clean Architecture, SOLID principles, and design patterns to build maintainable, reliable systems.
• Develop robust REST APIs, business workflows, and multi-tenant solutions with a strong focus on performance, security, and data integrity.
• Explore and integrate AI capabilities, including LLM-powered features and AI-assisted development practices.
• Champion code quality through TDD, automated testing, code reviews, and continuous improvement of engineering practices.
• Collaborate with Product and Engineering teams to translate business requirements into effective technical solutions and deliver features from design through production.

Who we're looking for

• 5+ years of hands-on experience with C#/.NET and building production-grade applications and REST APIs.
• Strong expertise in software architecture, including Clean Architecture, SOLID principles, design patterns, and architectural trade-offs.
• Hands-on experience with React and TypeScript, including modern frontend development practices.
• Solid experience with EF Core and PostgreSQL or SQL Server, including transactions, query optimization, and data integrity.
• Strong understanding of API security, including authentication, authorization, JWT, claims, and CORS.
• Experience with automated testing frameworks such as xUnit, mocking libraries such as NSubstitute or Moq, and containerization using Docker/Docker Compose.
• Strong problem-solving, ownership, and communication skills. Experience with LLM/AI integration or AWS is a plus.

What we offer

• Attractive and competitive performance-based compensation package.
• Full gross salary during probation.
• Generous 13-month salary and dedication bonus.
• Comprehensive healthcare insurance package and annual health check-ups.
• Flexible check-in time before 10:00 AM on weekdays.
• 2 days remote work per week.
• 12 annual leave days, 5 sick leave days, 11 public holidays as required by Vietnamese Labor Law, plus one extra day off for Christmas.
• Opportunity to work on global projects, collaborate with international teams.
• Daily breakfast, Happy Thursday gatherings to connect with colleagues.
• Active sport clubs such as badminton, running, football, music clubs.
• Teambuilding activities, annual company trips, and year end party.
• Continuous learning opportunities through technical & soft skills training, English classes, and internal communities.
• Financial assistance for important life events, including marriage, childbirth, and bereavement, ensuring support at every stage of life.