Senior Backend Engineer - C#/.NET, REST APIs & Payments

Send; Johor Bahru; On-site; MYR 100,000 - 160,000; Full time

Job summary

Send is seeking a skilled Backend Engineer to develop and maintain our services. You will own well-scoped changes, work with senior engineers on distributed systems, payment flows, and production rollout decisions.

Responsibilities include building C#/.NET services, REST APIs, data modeling with SQL, and implementing reliable processing with retries and idempotency. You will collaborate across teams to ensure smooth deployments and robust integrations.

Qualifications

• Production backend development with C# and .NET.
• REST API design, validation, authentication, and authorization.
• Strong SQL fundamentals with MySQL or PostgreSQL.
• Understanding of asynchronous processing, idempotency, and retries.
• Hands-on AWS experience; familiarity with Docker and deployment pipelines.
• Automated testing, Git, code review, and debugging skills.
• Ability to deliver scoped changes independently and explain risks.
• Ability to use AI tools to improve productivity and prepare tests/documentation.

Responsibilities

• Build and maintain C# and .NET services, REST APIs, and third-party integrations.
• Model data, write SQL, and implement reviewed schema migrations and transaction handling.
• Implement reliable processing with idempotency, bounded retries, timeouts, and clear failure handling.
• Work with queues and asynchronous events, including duplicate delivery and failed-message investigation.
• Write unit and integration tests for normal, failure, and recovery scenarios.
• Support CI/CD and container workflows, add useful logs and metrics, and investigate production issues.
• Coordinate API contracts with frontend, mobile, and QA engineers; upscale high-risk changes before release.

Skills

C# & .NET

REST API design

SQL fundamentals

Asynchronous processing

Automated testing

Git

AI tools

Debugging

Tools

Docker

AWS

Job description

Send is seeking a skilled Backend Engineer to develop and maintain our services. You will own well-scoped changes, work with senior engineers on distributed systems, payment flows, and production rollout decisions.

Responsibilities include building C#/.NET services, REST APIs, data modeling with SQL, and implementing reliable processing with retries and idempotency. You will collaborate across teams to ensure smooth deployments and robust integrations.