Senior .NET Engineer – Air API Development

Company: NZ I TECH / MYNZTRIP

Department: Technology – Air API Development

Employment Type: Full-Time

Experience Level: Senior

Job Location: Banani, Dhaka, Bangladesh

Salary: Negotiable

About the Role

NZ I TECH / MYNZTRIP is looking for an experienced Senior .NET Engineer to join our Air API Development Team.

The selected candidate will develop, integrate, optimize, and maintain high-performance airline API services for our OTA ecosystem. The platform connects with airlines, GDSs, NDC providers, aggregators, and other travel suppliers and serves B2B, B2C, white-label, and external API customers.

Key Responsibilities

• Design and develop scalable REST APIs using ASP.NET Core and .NET 8.
• Build and maintain flight search, pricing, booking, ticketing, cancellation, refund, void, and reissue services.
• Integrate and maintain GDS, NDC, airline direct-connect, LCC, and aggregator APIs.
• Call multiple supplier APIs concurrently and aggregate their responses into a standardized format.
• Implement asynchronous processing, timeout handling, retry policies, circuit breakers, cancellation tokens, and supplier isolation.
• Map and normalize XML, SOAP, REST, and JSON responses from different suppliers.
• Develop complex airline fare, tax, markup, discount, commission, baggage, ancillary, and fare-rule processing.
• Improve API response time, throughput, memory usage, connection management, and overall scalability.
• Implement structured logging, monitoring, correlation IDs, and supplier request/response tracing.
• Troubleshoot production issues involving timeouts, memory usage, thread exhaustion, incorrect fares, missing flights, booking failures, and supplier connectivity.
• Write unit, integration, API, and supplier integration tests.
• Review code, guide junior and mid-level developers, and contribute to architectural decisions.
• Collaborate closely with QA, DevOps, product, and business teams.

Required Skills

• 5+ years of professional software development experience.
• 4+ years of strong C# and .NET development experience.
• Strong experience with ASP.NET Core, .NET 8, and Web API development.
• Strong third-party API integration experience.
• Excellent knowledge of async/await, Task, Task.WhenAll, CancellationToken, concurrency, and parallel processing.
• Hands-on experience with REST, SOAP, XML, JSON, HTTP, and HTTPS.
• Experience with LINQ, Entity Framework Core, Dependency Injection, and object-oriented programming.
• Strong understanding of SOLID principles, Clean Architecture, design patterns, and separation of concerns.
• Experience with PostgreSQL or other SQL databases.
• Experience with Git, GitHub, Swagger, and OpenAPI.
• Strong debugging, root-cause analysis, and production troubleshooting skills.
• Good understanding of API authentication, including JWT, OAuth 2.0, API keys, and Basic Authentication.

Preferred Skills

Experience with the following will be considered an advantage:

• Travelport/Galileo, Sabre, or Amadeus
• Airline NDC or direct-connect APIs
• GDS, PNR, fare pricing, ticketing, refund, void, and reissue workflows
• Redis and MongoDB
• AWS, IIS, Windows Server, and Linux
• Docker and microservices
• RabbitMQ or Kafka
• OpenTelemetry, Prometheus, Grafana, and AWS CloudWatch
• High-concurrency and distributed systems
• Online Travel Agency platforms

Candidates without previous GDS experience may also apply if they have excellent .NET backend development and complex third-party API integration experience.

What We Expect

• Strong ownership and problem-solving ability
• Clean, maintainable, and production-quality code
• Ability to investigate complex technical problems independently
• Clear technical communication
• Ability to handle multiple supplier integrations
• Willingness to learn airline and GDS business concepts
• Focus on scalable, long-term solutions

Why Join Us?

You will work on a real-world international Air API aggregation platform involving:

• Real-time airline content
• High-concurrency API processing
• Multiple supplier aggregation
• Complex fare calculations
• Flight search, booking, and ticketing workflows
• Distributed systems and external API reliability
• Performance optimization and scalable OTA architecture

You will have significant ownership and the opportunity to influence the future architecture of the MYNZTRIP Air API ecosystem.

How to Apply

• Interested candidates are requested to apply through our online application form using the Apply button on this job post. Please complete all required information accurately and upload your updated CV. Only shortlisted candidates will be contacted for the next stage of the recruitment process.