Senior Full-Stack Engineer (App Team) in London

Senior Full-Stack Engineer (App Team) in London

London Full-Time 60000 - 80000 £ / year (est.) Home office (partial)
Avios Group (AGL) Limited

At a Glance

  • Tasks: Lead the delivery of high-impact 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 building scalable solutions with cutting-edge technologies.
  • Qualifications: Expertise in React Native or .NET/C# and experience in delivering customer-facing applications.

The predicted salary is between 60000 - 80000 £ 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) in London employer: Avios Group (AGL) Limited

At IAG Loyalty, we pride ourselves on being an exceptional employer that fosters a collaborative and innovative work culture. 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 fast-paced iteration of ideas.

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) in London

Tip Number 1

Network like a pro! Reach out to your connections in the tech industry, especially those who work at companies you're interested in. A friendly chat can lead to referrals, which can give you a leg up in the hiring process.

Tip Number 2

Show off your skills! Create a portfolio showcasing your best 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 technical interviews by brushing up on your coding skills and system design knowledge. Practice common interview questions and consider mock interviews with friends or mentors to build 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) in London

React Native
.NET/C#
End-to-End Feature Delivery
Mobile and Backend Systems Integration
APIs
Distributed Systems
Cloud Environments (AWS preferred)

Some tips for your application 🫡

Show Off Your Skills:Make sure to highlight your expertise in React Native or .NET/C#. We want to see how your experience aligns with the role, so don’t hold back on showcasing your best projects and achievements!

Tailor Your Application:Take a moment to customise your application for us. Mention specific features or projects that resonate with what we do at StudySmarter. This shows you’ve done your homework and are genuinely interested in joining our team.

Be Clear and Concise:When writing your application, keep it straightforward. Use clear language and avoid jargon where possible. We appreciate a well-structured application that gets straight to the point without fluff!

Apply Through Our Website:Don’t forget to submit your application through our website! It’s the best way for us to receive your details and ensures you’re considered for the role. Plus, it makes the process smoother for everyone involved.

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

Know Your Tech Stack Inside Out

Make sure you’re well-versed in 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 End-to-End Experience

Prepare examples of projects where you’ve delivered features from ideation to delivery. Highlight your role in collaborating with cross-functional teams, and be specific about the challenges you faced and how you overcame them.

Demonstrate Your Mentorship Skills

Since mentoring is part of the role, think of instances where you’ve helped others improve their skills or practices. Be ready to discuss how you’ve contributed to raising engineering standards within your team.

Embrace the Fast-Paced Environment

This company values quick iterations over perfection. Prepare to talk about how you adapt to changing requirements and your approach to continuous improvement. Share examples of how you’ve learned from past experiences to drive progress.