Senior Full-Stack Engineer (App Team)

Senior Full-Stack Engineer (App Team)

Full-Time 60000 - 75000 £ / year (est.) Home office (partial)
Avios Group (AGL) Limited

At a Glance

  • Tasks: Lead the delivery of impactful features for the Avios App across mobile and backend systems.
  • Company: Join a dynamic team at IAG Loyalty, known for innovation and collaboration.
  • Benefits: Enjoy a hybrid work model, competitive salary, and opportunities for professional growth.
  • Other info: Be part of a high-performing team that values collaboration and continuous improvement.
  • Why this job: Make a real impact by owning projects from ideation to delivery in a fast-paced environment.
  • Qualifications: Expertise in React Native or .NET/C# with experience in end-to-end feature delivery.

The predicted salary is between 60000 - 75000 £ per year.

We are looking for a Senior Full Stack Engineer to lead the delivery of complex, high‑impact features across the Avios App's mobile and backend systems. You should have deep expertise in either React Native or .NET/C#, with solid hands‑on experience in the other, enabling you to operate confidently across the full stack.

Responsibilities

  • Deliver end‑to‑end features across the Avios App, building scalable, reliable solutions using React Native and .NET/C#.
  • Collaborate with teammates across engineering, QA, Product Managers and Designers to break down complex problems and produce production‑ready solutions.
  • Apply strong technical judgement to shape implementation approaches, challenge decisions where necessary, and maintain high standards of quality, performance and maintainability.
  • Support the wider team through code reviews, mentoring, and continuous improvement of engineering practices.
  • Identify opportunities to improve scalability, reliability and developer experience, fostering a culture of ownership and continuous improvement.

Qualifications

  • Strong experience delivering customer‑facing applications at scale.
  • Deep expertise in either React Native or .NET/C#, and hands‑on experience in the other.
  • 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.

What 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 that helps each other succeed.
  • You value perfection over fast iteration and progress; IAG Loyalty moves fast, learning and iterating as we go.
  • You’re looking to create but not build; this is an end‑to‑end role, so you need to be comfortable owning your space from ideation through delivery and review.

Location & Working Arrangement

This role will work as part of our Loyalty Division and is based out of our London office. The team follows a hybrid model (The Blend), requiring employees 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 responsibilities.

Senior Full-Stack Engineer (App Team) employer: Avios Group (AGL) Limited

At IAG Loyalty, we pride ourselves on being an exceptional employer, offering a dynamic work culture that fosters collaboration and innovation. As a Senior Full-Stack Engineer in our London office, you'll enjoy the benefits of a hybrid working model, opportunities for professional growth through mentorship, and the chance to make a significant impact on our customer-facing applications. Join us to be part of a high-performing team that values ownership, continuous improvement, and the excitement of delivering end-to-end solutions.

Avios Group (AGL) Limited

Contact Details:

Avios Group (AGL) Limited Recruitment Team

StudySmarter Expert Advice🤫

We think this is how you could land Senior Full-Stack Engineer (App Team)

Tip Number 1

Network like a pro! Reach out to your connections in the industry, attend meetups, and engage with online communities. You never know who might have the inside scoop on job openings or can refer you directly.

Tip Number 2

Show off your skills! Create a portfolio showcasing your projects, especially those involving React Native or .NET/C#. This gives potential employers a taste of what you can do and sets you apart from the crowd.

Tip Number 3

Prepare for interviews by practising common technical questions and coding challenges. We recommend doing mock interviews with friends or using platforms that simulate real interview scenarios to boost your confidence.

Tip Number 4

Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows you’re genuinely interested in joining our team at StudySmarter.

We think you need these skills to ace Senior Full-Stack Engineer (App Team)

React Native
.NET/C#
End-to-End Feature Delivery
API Understanding
Distributed Systems
Cloud Environments (AWS preferred)
CI/CD

Some tips for your application 🫡

Tailor Your CV:Make sure your CV reflects the skills and experiences that match the Senior Full-Stack Engineer role. Highlight your expertise in React Native or .NET/C#, and don’t forget to mention any end-to-end project deliveries you've been part of!

Craft a Compelling Cover Letter:Your cover letter is your chance to shine! Use it to explain why you’re excited about the role and how your background makes you a perfect fit. Be sure to mention your collaborative spirit and experience with mentoring, as we value teamwork.

Showcase Your Projects:If you’ve worked on any impressive projects, make sure to include them in your application. Whether it’s a personal project or something from your previous job, showing off your hands-on experience with mobile and backend systems can really set you apart.

Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you don’t miss out on any important updates. Plus, we love seeing applications come in through our own channels!

How to prepare for a job interview at Avios Group (AGL) Limited

Know Your Tech Inside Out

Make sure you have a solid grasp of both React Native and .NET/C#. Brush up on your knowledge of APIs, distributed systems, and cloud environments like AWS. Be ready to discuss how these technologies interact in a production environment.

Showcase Your Problem-Solving Skills

Prepare to talk about complex problems you've tackled in the past. Think of specific examples where you collaborated with cross-functional teams to deliver end-to-end features. Highlight your approach to breaking down challenges and producing production-ready solutions.

Demonstrate Your Mentorship Experience

Since mentoring is key for this role, come prepared with examples of how you've supported other engineers. Discuss your experiences with code reviews and how you've contributed to raising engineering standards within your team.

Emphasise Collaboration and Communication

This role requires strong collaboration skills, so be ready to share how you've worked effectively with Product Managers, Designers, and QA teams. Highlight any instances where your communication skills helped resolve issues or improve project outcomes.