Software Developer (Mid-Level) – Full Stack (.NET, React & AI)

OKAY.com is a leading tech-driven real estate agency in Hong Kong, specialising in luxury property. We build and run our own systems in-house — a proprietary ERP, our public website, and a growing set of data and automation tools.

We are hiring an experienced full stack developer to build modern web products and AI-enabled features. You will own features end to end, across frontend, backend, and cloud, and see what you build used by the business within weeks rather than quarters.

AI is a core part of this role, not a side project. We are actively putting AI into our products and internal workflows, and we expect you to have already done this yourself — not just read about it.

What you'll do

• Design, build, test, and maintain scalable web applications across frontend and backend
• Build new functions into our proprietary ERP, and analytics and automation tools on top of our data
• Develop features using React.js, C#/.NET 8, and RESTful APIs
• Ship AI-enabled features — integrating AI APIs into existing products, and building internal tools for content generation, summarisation, search, and workflow automation
• Improve prompt quality, output reliability, and safety controls on what we ship
• Work with product, design, marketing, and business teams to turn business problems into working software
• Take part in code reviews, CI/CD pipelines, and engineering best practices
• Troubleshoot and resolve production issues to keep performance and user experience strong

What we're looking for

• 4+ years of professional software development experience, able to take a feature from requirement to production with limited supervision
• Strong React.js — comfortable building and maintaining real applications, with sound judgement on component design and state management
• Solid modern frontend practices: responsive UI, reusable components, clean architecture
• Backend experience with C#, ASP.NET Core / .NET 8, and REST API design
• Working knowledge of SQL Server, T-SQL, LINQ, and Entity Framework
• Comfortable with JSON, Git, and CI/CD pipelines (Azure DevOps preferred)
• Hands-on experience with Azure — App Service, Container Apps, Functions, or Azure SQL. AWS experience considered.
• Good problem-solving ability and clear communication in English

AI experience — required

• You have shipped something real using AI services (Azure OpenAI, OpenAI, Anthropic, or similar) — a product feature, an internal tool, or an automation that people actually use
• Practical prompt design and iteration, and a sense of when AI is the wrong tool for the job
• Awareness of output reliability, hallucination handling, and data privacy when building AI features
• You use AI coding tools in your day-to-day work and can tell us how

Why join us

• Competitive salary with comprehensive benefits

• Flexible working arrangements that support work-life balance

• Hands-on exposure to AI projects and emerging technologies

• Clear opportunities for professional development and career progression

• Office in Central, Hong Kong — a short walk from the MTR

How to apply

Along with your CV, tell us in a few sentences about one thing you have built using AI — what it was, what you used, and what you'd do differently now.