Senior Back-End Developer (C#, ASP.NET, MS SQL Server)

AES Global; Cape Town; Hybrid; ZAR 1,000,000 - 1,600,000; Full time

Job summary

AES Global is seeking a Senior Back-End Developer to design, build and maintain scalable, high-performance systems for its travel platforms. You’ll be a hands-on developer with integration experience and a focus on clean, production-ready code.

Join a team delivering RESTful APIs, microservices and integrations with GDS, payment gateways and suppliers, while collaborating with product teams and adhering to CI/CD practices in a hybrid Cape Town/Johannesburg setup.

Qualifications

• 8–10 years in software development (backend focus).
• Proficient in C# / .NET, REST APIs, MS SQL Server, and LINQ.
• Experience with JSON/XML, SOAP/REST integration, and microservices.
• Bachelor’s degree or diploma in CS/IT/Engineering or equivalent.

Responsibilities

• Design, develop and maintain back-end services and APIs.
• Build and support high-volume, scalable systems in travel platforms.
• Develop RESTful APIs and integrations with third-party providers.
• Collaborate with frontend teams, product, and stakeholders on end-to-end solutions.
• Ensure performance, security and reliability; troubleshoot and optimize systems.
• Contribute to DevOps, CI/CD and documentation/code reviews.

Skills

C# / .NET

REST API design

MS SQL Server

LINQ

JSON/XML

Web-services integration

Microservices architecture

Secure coding

Integration-heavy systems

Education

Bachelor's degree or diploma in CS/IT/Engineering

Tools

Git

Azure DevOps

Azure App Services

Azure Functions

API Management

Job description

We’re working with an established travel technology company, and they’re looking for a Senior Back-End Developer to design, build and maintain the scalable, high-performance systems behind its travel platforms.

You’ll be a hands-on developer with strong integration experience, a passion for clean, maintainable code, and a focus on reliable, production-ready systems.

What you’ll do

• Design, develop and maintain back-end services and APIs
• Build and support high-volume, scalable systems used in travel booking and related platforms
• Develop RESTful APIs and integrations with third-party providers (e.g. GDS, payment gateways, suppliers)
• Collaborate with front-end developers, product teams and stakeholders on end-to-end solutions
• Ensure performance, security and reliability, and troubleshoot and optimise existing systems
• Contribute to DevOps, CI/CD and deployment, and maintain clear documentation and code reviews

What you’ll bring

• Around 8–10 years in software development (back-end focused)
• Strong C# / .NET (ASP.NET Core preferred), REST API design, MS SQL Server (design and performance tuning) and LINQ
• Solid JSON/XML, web-services integration (SOAP & REST) and microservices architecture
• Git, CI/CD (preferably Azure DevOps), secure coding, Azure Logic Apps and Microsoft Azure (App Services, Functions, API Management)
• Proven experience on integration-heavy systems
• A bachelor’s degree or diploma in Computer Science, IT, Engineering or equivalent

Advantageous

• Messaging queues (Service Bus, RabbitMQ), IIS configuration, and front-end basics (HTML, JS, CSS, Vue)
• Travel-industry integrations (e.g. Amadeus, Travelport, Sabre), payment gateways and high-availability systems
• ERP integrations (SAP, Oracle, Sage), and data security / compliance (POPIA, GDPR, PCI DSS)

Working model

Hybrid — mostly remote for Cape Town-based candidates, with office options in Cape Town or Johannesburg.