Senior AI-Driven Fullstack Developer (ReactJS, C#)

Top 3 reasons to join us

• Utilise latest AI technologies in development
• Work hands-on across analysis and development
• Enjoy benefits such as a 13th-month salary

Job description

Office location: Ho Chi Minh City (District 1) | Company HQ: Melbourne, Australia

Employment Type: Full-time

Your Role

We’re not looking for a conventional Senior Fullstack .NET Developer. We’re looking for a game-changer, an all-rounder who can harness AI to 10x productivity and reinvent how software is built. In this role, you won’t just code—you’ll analyze business needs, design solutions, test features, and deliver products end-to-end. You’ll become the driver of AI-powered software development in our business, leading the way in transforming how we create exceptional products for our customers.

You will join as a Senior .NET Full-Stack Developer with the opportunity to grow into a Technical Lead role. Initially, your main responsibility is hands-on coding, building high-quality features, and testing the TOMSoft products. These include four core products—Tom Delivery, Tom Enterprise, and the Tom Platform—as well as new and exciting solutions we are building for the mortgage broking, legal, and facilities management industries. Over time, as you demonstrate leadership and technical ownership, you will be mentored and supported to step into a lead position where other developers will work around you.

Your Mission

Development & Delivery (Primary)

• Use AI tools to accelerate development, testing, and solution design.
• Own the full lifecycle: business analysis, design, coding, testing, and release.
• Design, build, test and maintain features for:
  • TOMSoft ERP suite (Delivery, Enterprise, Business, Platform) – our core systems for business operations and customer workflows.
  • New industry-focused products in mortgage broking, legal, facilities management, and more!
• Write clean, maintainable, and testable code in .NET (C#) and ReactJS (TypeScript).
• Participate in code reviews and contribute to improving coding standards and practices.

Technical Growth to Leadership

• Innovate continuously, finding smarter ways to deliver outcomes.
• Lead by example and grow into the technical leader driving our AI-first approach.
• Gradually take ownership of technical design decisions and system architecture.
• Learn to guide and mentor junior developers.

Support & Collaboration

• Work closely with the Australian product and customer success teams to understand requirements and priorities.
• Help troubleshoot and resolve complex issues in collaboration with QA and BA/PO.
• Support production issue investigations when escalated.

Your skills and experience

What We’re Looking For

• English: Good communication for working directly with Australian stakeholders
• Business domain: ERP systems, business operation systems, workflow-heavy SaaS
• Hands-on experience using AI tools in coding, testing, or solution design.
• 5+ years of experience with Microsoft technologies:
  • Backend: ASP.NET MVC (Framework and Core), C#, Web API, Entity Framework
  • Database: SQL Server, MongoDB
  • Frontend: ReactJS (TypeScript), HTML5, CSS3, Bootstrap/Tailwind
• Solid understanding of system architecture, data modeling, and design patterns.
• Experience with Azure services like SQL Azure, Web App Services, Service Bus, Redis Cache, Azure Functions.
• Familiar with CI/CD using Azure DevOps or similar tools.
• Strong problem-solving skills and proactive attitude.
• A proactive, adaptable attitude suitable for a startup environment.

Success in 3–6 Months Looks Like

• Delivering high-quality features independently with minimal supervision.
• Demonstrating strong ownership of assigned modules and services.
• Building trust with all team members including the product manager and BoD, and showing readiness for leadership responsibilities.
• Supporting the team in resolving complex technical issues and improving coding standards.

To Apply:

Send your CV with subject: 

[Senior .NET] Your-full-name – Mobile Number – HCMC (Onsite)

Why you'll love working here

About Tomsoft

Secomm is an eCommerce & Software Solution Provider agency based in Saigon since 2014. Our technologies and platforms are wide-ranged from PHP, Javascript, .NET, Magento, Shopify, Power Platform, etc... We have clients from Australia, Vietnam, Singapore, HongKong, and our market is expanding.

TOMSoft, a long-term Secomm's partner, is a growing Australian software company focused on building innovative, AI-driven SaaS products. Tomsoft develops four core systems—Tom Delivery, Tom Enterprise, and the Tom Platform—to make ERP and business operations accessible for small and medium-sized companies. Beyond ERP, Tomsoft is expanding into new industries, creating products for mortgage broking, financial services, legal services, and facilities management, combining deep domain knowledge with cutting-edge technology.

Why Join Us?

• Shape how our products are delivered to customers in Australia while growing a high-performing Vietnam team alongside our software product development team.
• Work hands-on across discovery, analysis, delivery, and customer success.
• Gain international exposure with opportunities to work in Australia or the U.S.
• Enjoy benefits such as a 13th-month salary, performance bonuses, team-building events, and professional training.