Senior Software Engineer

VOX ASIA / PT Indo Online Mitra Usaha; Kota Bandung; On-site; IDR 279,000,000 - 502,200,000; Full time

Benefits offered by this job

Health insurance

Inclusive culture

Work-life balance

Job summary

PT Indo Online Mitra Usaha (Vox Asia) in Bandung, Indonesia, seeks an experienced software engineer to design and build scalable applications using C#, ASP.NET Core and Python with AI and LLM integration.

You will develop backend services, AI components, and LLM-powered features, collaborating across .NET and Python, and integrating with external platforms and databases. Fluency in English is required.

Qualifications

• 4+ years of professional software development experience.
• Strong professional experience with C# and ASP.NET Core.
• Practical development experience with Python.
• Strong understanding of REST APIs, DI, SOLID, clean architecture, async programming, distributed design.
• Experience with EF Core, LINQ and SQL.
• Experience designing and integrating web APIs and external services.
• Good testing, debugging and production troubleshooting skills.
• Experience with Git, CI/CD and modern workflows.
• Strong written and spoken English.
• Experience building apps using LLMs (OpenAI/Azure OpenAI/Anthropic) is desirable.

Responsibilities

• Design and develop scalable backend services using C# / ASP.NET Core.
• Develop supporting services and AI-related components in Python.
• Build and integrate LLM-powered chat and assistant functionality.
• Work with LLM APIs and frameworks.
• Design APIs and integrations between .NET and Python services and external platforms.
• Work with SQL databases and search technologies like Elasticsearch.
• Leverage AI-assisted development tools and own your produced code.

Skills

C#

ASP.NET Core

Python

REST APIs

Git & CI/CD

English communication

LLM APIs

Tools

Entity Framework Core

LINQ

Job description

About the role

You will help design, build and evolve applications using C#, ASP.NET Core and Python, including systems that incorporate AI and LLM-based functionality. We are looking for an experienced software engineer who is comfortable working across .NET and Python and is interested in building modern applications that integrate LLMs, conversational AI, search and AI-assisted workflows.

Key Responsibilities

• Design and develop scalable backend services using C# / ASP.NET Core.
• Develop supporting services and AI-related components in Python.
• Build and integrate LLM-powered chat and assistant functionality.
• Work with LLM APIs and frameworks
• Design APIs and integrations between .NET services, Python services and external platforms.
• Work with relational databases such as SQL Server/PostgreSQL and search technologies such as Elasticsearch.
• Use modern AI-assisted development tools effectively as part of the software development lifecycle, with the understanding that you are the owner of your produced code.

Qualification

• 4+ years of professional software development experience.
• Strong professional experience with C# and ASP.NET Core.
• Practical development experience with Python.
• Strong understanding of REST APIs, dependency injection, SOLID principles, clean architecture, asynchronous programming, and distributed application design.
• Experience with Entity Framework Core, LINQ and SQL.
• Experience designing and integrating web APIs and external services.
• Good understanding of testing, debugging and production troubleshooting.
• Experience working with Git, CI/CD and modern development workflows.
• Strong written and spoken English.
• Practical experience building applications using LLMs is particularly desirable. (OpenAI, Azure OpenAI, Anthropic or similar LLM APIs, LLM chat applications)
• Experience with tools such as GitHub Copilot, Cursor, Claude Code, ChatGPT or similar coding assistants is valuable.

About us

PT Indo Online Mitra Usaha (Vox Asia) is based in Bandung, West Java, Indonesia.

Job summary

Experienced software engineer to design and build scalable applications using C#, ASP.NET Core and Python with AI and LLM integration.

Key selling points

• Global Company (Base in Belgium)
• Health insurance
• Inclusive Culture & Work-Life Balance