First Line Software works with some of the world's top businesses and organizations in industries like healthcare, data engineering, warehouse automation, retail digitalization, mobile app development, and e-commerce. Our projects are as varied as our people, and our people are as talented as they come. We prefer working as a transparent and supportive team, who shares our knowledge as well as our success.

Let's see what we can create together

The project and your role

Our client is rebuilding its guest-facing digital estate on a modern microservices architecture moving away from a fragmented collection of out-of-the-box portals toward a purpose-built digital platform that delivers personalised, seamless guest experiences across discovery, booking, pre-stay, and in-stay touchpoints. As a Digital Product Engineer, you'll build the digital products guests and staff use every day, working on a React/Next.js front-end and a back-end of independently deployable .NET 8 / ASP.NET Core microservices hosted on AWS.
- Build and maintain guest-facing features in React and Next.js — search,



the booking funnel, conversion optimisation, and promotional campaign delivery, in partnership with commercial and marketing teams
- Deliver logged-in guest journeys on the guest portal, including pre-stay upsell, activity booking, and in-stay engagement
- Contribute to loyalty platform features — enrolment flows, member personalisation, and loyalty mechanics
- Design and build .NET 8 / ASP.NET Core microservices — REST APIs, domain logic, and integrations with core booking, CMS, and contact-center systems
- Deploy and operate microservices on AWS using Lambda and ECS/Fargate, choosing the right hosting model per service
- Implement event-driven communication between services using AWS SQS, SNS, and EventBridge
- Design RESTful APIs to agreed standards, including OpenAPI specifications, versioning, and documentation
- Write unit, integration, and end-to-end tests, and ship through CI/CD (

📌 Digital Product Engineer (España)
🏢 First Line Software
📍 España