Backend Developer (Middle to Senior)

Spolith Sdn Bhd; Kuala Lumpur; On-site; MYR 120,000 - 210,000; Full time

Job summary

Spolith Sdn Bhd is seeking a Backend Software Developer to design, develop, and maintain backend services and APIs in a cloud-enabled environment. The role emphasizes robust data modeling, secure authentication, and scalable message-driven architectures.

The ideal candidate has 3+ years of backend experience with .NET Core / ASP.NET Core, C#, and experience with PostgreSQL or SQL Server, plus NoSQL familiarity (DynamoDB/MongoDB). Strong English and Mandarin communication is expected.

Qualifications

• 3+ years of backend development experience.
• Strong knowledge of .NET Core / ASP.NET Core for web APIs and backend services.
• Proficiency in C# with clean, scalable code.
• Experience with PostgreSQL or SQL Server, writing complex queries and designing schemas.
• Familiarity with RESTful API design and development.
• Authentication/authorization using OAuth2, JWT, and AWS Cognito.
• Experience with asynchronous processing and messaging systems (Kafka, RabbitMQ, AWS SNS/SQS).
• Background in distributed systems and event-driven architectures.
• Fluent in English and Mandarin.
• Familiarity with NoSQL databases (DynamoDB, MongoDB).

Responsibilities

• Design, develop, and maintain backend services and APIs.
• Optimize database performance and design efficient data models.
• Implement authentication, authorization, and security best practices.
• Develop and maintain asynchronous processing and messaging systems.
• Work closely with front-end and DevOps teams to integrate backend functionalities.
• Debug, troubleshoot, and improve system performance and reliability.

Skills

Backend development

RESTful API design

C#

.NET Core / ASP.NET Core

Cloud services

Asynchronous processing

Distributed systems

English

Mandarin

Kafka

RabbitMQ

DynamoDB

MongoDB

PostgreSQL

SQL Server

OAuth2 / JWT / AWS Cognito

Tools

.NET Core

PostgreSQL

SQL Server

DynamoDB

MongoDB

Kafka

RabbitMQ

AWS Cognito

AWS SNS/SQS

Job description

As a Backend Software Developer, you will be responsible for designing, developing, and maintaining backend services and APIs. You will collaborate with cross-functional teams to build robust and efficient backend systems that integrate seamlessly with front-end applications and cloud-based services. The ideal candidate will have a minimum of 3+ years of experience in backend development and a strong technical background in .NET Core, API development, and cloud services.

Key responsibilities

Design, develop, and maintain backend services and APIs.

Optimize database performance and design efficient data models.

Implement authentication, authorization, and security best practices.

Develop and maintain asynchronous processing and messaging systems.

Work closely with front-end and DevOps teams to integrate backend functionalities.

Debug, troubleshoot, and improve system performance and reliability.

About you

3+ years of experience in back-end development.

Strong expertise in .NET Core / ASP.NET Core for building web APIs and backend services.

Proficiency in C# with a focus on clean, efficient, and scalable code.

Experience with relational databases such as PostgreSQL or SQL Server (writing complex queries, optimizing performance, designing schemas).

Strong understanding of RESTful API design and development.

Implementation of authentication and authorization using OAuth2, JWT, and AWS Cognito.

Experience with asynchronous processing and messaging systems (e.g., Kafka, RabbitMQ, AWS SNS/SQS).

Background in building distributed systems and event-driven architectures.

Fluent in English and M*ndarin.

Familiarity with NoSQL databases (e.g., DynamoDB, MongoDB).