Who we are 🌍
We’re IAG Loyalty - one organisation with two ambitious, growing divisions across Loyalty and Holidays. Each has its own goals, strategy and team, but together we’re united by a shared vision to create a more rewarding world of travel and experiences.
Our Loyalty division is home to Avios, the global loyalty currency, enabling millions of members to collect and spend rewards across travel, retail and financial services.
Our Holidays division including British Airways Holidays and Iberia Vacaciones, brings together trusted brands, connecting customers to thousands of destinations worldwide through seamless, end-to-end travel experiences.
We’re on an exciting journey of growth and transformation – we’re going places.
The opportunity ✨Join IAG Loyalty and help shape the continued development of the Avios App, a global loyalty platform used by millions of travellers worldwide.
As a Senior Full Stack Engineer, you’ll lead the delivery of complex, high-impact features across both mobile and backend systems. You’ll bring deep expertise in either React Native or .NET/C#, alongside strong hands-on experience in the other, and will be expected to operate confidently across the full stack.
We are deliberately hiring engineers who are strong in one domain but credible and effective in the other—whether that’s a mobile-first engineer who understands backend systems deeply, or a backend-first engineer who can confidently contribute to mobile development.
Working within a dedicated product team, you’ll play a key role in shaping solutions, guiding implementation, and raising engineering standards across a platform used by millions of customers.
What you’ll be doing 🚀You’ll take ownership of delivering features end-to-end across the Avios App, working across both React Native and .NET/C# to build scalable, reliable solutions. While you’ll naturally lead in your core area of expertise, you’ll also contribute meaningfully across the wider stack—collaborating with teammates to ensure features are designed and delivered holistically rather than in silos.
Day to day, you’ll work closely with engineers, QA, Product Managers and Designers to break down complex problems and turn them into well-designed, production-ready solutions. You’ll be expected to bring strong technical judgement, helping to shape implementation approaches, challenge decisions where needed, and ensure a high bar for quality, performance and maintainability.
You’ll also play an important role in supporting the wider team—contributing to code reviews, mentoring other engineers, and helping to continuously improve engineering practices across the platform. This includes identifying opportunities to improve scalability, reliability and developer experience, as well as contributing to a culture of ownership and continuous improvement.
What we need from you ⚡
Strong experience delivering customer-facing applications at scale
Deep expertise in either React Native or .NET/C#
Strong hands-on experience in the other — able to confidently read, debug and contribute to production code
Experience delivering features end-to-end across mobile and backend systems
Clear understanding of how mobile and backend systems interact in a production environment
Strong understanding of APIs, distributed systems and cloud environments (AWS preferred)
Experience with CI/CD, automated testing and modern engineering practices
Ability to contribute to technical discussions and influence implementation decisions
Experience mentoring engineers and raising engineering standards
Strong communication and collaboration skills
We might not be right for you if:
You only want to focus on your to-do list; we’re a small, high-performing team, we help each other to succeed.
You value perfection over fast iteration and progress; IAG Loyalty moves fast, we learn and iterate as we go; our environment isn’t right for everyone.
You’re looking to create but not build; this is an end-to-end role, you need to be comfortable owning your space, from ideation through to delivery and review.
If you think you have what it takes but don't meet every single point above, please do still apply. We'd love to chat and see if you could be a great fit.
The Blend 📍
This role will work as part of our Loyalty Division and is based out of our London office. We call our approach to hybrid working The Blend — it’s about giving you the flexibility to choose where you do your best work, while staying connected with your team and the wider business. This means you will be required to spend at least two days per week in the office, with the rest of the time working from home. You may also be required to work from one of our other office or partner locations, based on your role and 'to do' list
What Makes Us Special
You do! Our people bring the energy, the warmth, and the ideas that make the business extraordinary. As we grow, you’ll have the chance to grow too — with real opportunities to develop your skills and your career.
Diversity and Inclusion
Our vision is to create a more rewarding world of travel and experiences. Delivering that requires diverse thinking and inclusive leadership.
We are committed to building a workplace where people feel they belong and are valued for their perspective. Inclusion drives better decisions, stronger performance and more innovative outcomes.
We actively encourage applications from people with different experiences and backgrounds, and are committed to ensuring our recruitment process is fair, inclusive and accessible.
Diversity and Inclusion
Our vision is to create a more rewarding world of travel and experiences. Delivering that requires diverse thinking and inclusive leadership.
We are committed to building a workplace where people feel they belong and are valued for their perspective. Inclusion drives better decisions, stronger performance and more innovative outcomes.
We actively encourage applications from people with different experiences and backgrounds, and are committed to ensuring our recruitment process is fair, inclusive and accessible.
Skills Required
- Commercial experience as a Full Stack Engineer
- Hands-on experience with React Native
- Development experience in .NET and C#
- Experience working with AWS
- Knowledge of CI/CD and automated testing
- Experience delivering features in agile teams
- Ability to troubleshoot across distributed systems
- Experience with RESTful APIs and microservices
- Strong communication skills
- Experience mentoring engineers
- Interest in building mobile products at scale
What We Do
IAG Loyalty is part of International Airlines Group (IAG). We were founded as Airmiles in 1988 and became Avios in 2011, now we’re IAGL and we have over 30 years’ experience in loyalty. We manage the British Airways Executive Club, Iberia Plus, Vueling Club, and the Aer Lingus AerClub, and we have an impressive range of retail, travel and financial services partners of the Avios currency. We’re loyalty pioneers creating the world’s most rewarding experiences. That’s our vision. We help people to enjoy incredible experiences by collecting and redeeming the iconic Avios currency. We design customer loyalty programmes, build loyalty management tools, provide loyalty tech solutions, and produce invaluable data and customer insights to turn customer loyalty into a powerful tool for maximising a brand power and scale. We’re a vision and values led business. Our vision sets our ambition, and our values represent how we’re going to get there. Together, this perfect partnership unites our people into a club of colleagues that know why and how we do things here. Our values are owned by everyone in the club, and are uniquely ours: • We bring passion to our work • We have the courage to reimagine • We focus on agility • We excel in delivery • We keep learning and stay curious • We take belonging seriously Our colleagues bring our vision and values to life every day in all they do. For our business, for our customers and for each other.
