.NET software engineer
Confirmed on the employer's own hiring board on Nov 11, 2026. First seen by Alion on Nov 11, 2026.
Help build reliable technology that helps people invest and save for their future. As a .NET software engineer at Brand New Day, you’ll develop backend services and integrations that support our investment and savings platforms. Based in Bangkok, you’ll work closely with colleagues in Amsterdam, taking software from design through to production and helping improve the systems our customers rely on.
What will you do as a .NET software engineer?
You’ll design, develop and maintain .NET services for our investment and savings platforms. You’ll build APIs and integrations connecting our applications, internal systems and external providers. Security, data consistency, performance and maintainability will guide your work from design through testing, deployment and production support.
You’ll work closely with other software engineers, QA specialists, product owners and platform colleagues to turn requirements into reliable software. You’ll contribute to technical decisions, review changes and improve how we build and operate our services.
Your key activities and responsibilities
Design, develop and maintain backend services using C#, .NET and SQL
Build REST APIs and integrations with internal systems and external providers
Implement reliable asynchronous processing, including error handling, retries and handling duplicate messages
Write automated tests and use CI/CD pipelines to deliver changes safely
Monitor and troubleshoot services, improve performance and contribute to code reviews and knowledge sharing
You’ll be part of our international engineering team, where we share ideas openly, discuss technical trade-offs and support each other in building reliable software.
What you’ll receive from us
A competitive salary and provident fund
Medical and life insurance
19 days of paid leave, excluding Thai public holidays
Flexible working arrangements, including working from home two days per week
Training and sports budget
Free drinks and snacks, weekly company lunches and monthly dinners
Opportunities to visit our head office in Amsterdam
Space to develop your skills and contribute your ideas
Requirements
Who are you?
You are a thoughtful software engineer who takes pride in writing maintainable software and understanding how it behaves in production. You enjoy solving complex problems, discussing solutions with colleagues and taking ownership of your work.
What do you bring?
Practical experience developing backend applications with C# and .NET, including ASP.NET Core and Entity Framework
Experience designing and consuming REST APIs
Knowledge of relational databases, data modelling and SQL query performance
Experience with automated testing, Git and CI/CD
An understanding of software design principles and service-oriented or event-driven architectures
Experience developing applications on Microsoft Azure
Clear communication skills in English
Experience with Kafka or other messaging platforms, investment systems or financial services would be useful. You don’t need to meet every requirement to apply. If this role interests you and you bring relevant experience, we’d like to hear from you.
And one more thing: research shows that women and members of underrepresented groups often only apply if they meet 100% of the requirements. Does this sound familiar? If so, we encourage you to apply anyway. We look forward to meeting you! Check out our diversity policy here.