Senior Software Engineer - Backend

About the Role

As a Senior Software Engineer (Backend), you’ll design and build scalable applications, services and platforms across On the Beach.

This is a full-stack engineering position with a stronger emphasis on backend engineering, distributed systems and cloud-native architecture.

Our backend engineers solve a wide variety of problems. You could be working on systems responsible for communicating with external travel suppliers, processing large volumes of hotel inventory and pricing information, powering customer search experiences, or ensuring bookings move reliably through complex transactional workflows.

You’ll work across the development lifecycle and collaborate with engineers, product managers and other technical specialists to design, build, deploy and operate reliable software at scale.

What you’ll be doing day to day

Designing and building scalable backend applications and services

Developing APIs used by customer-facing applications and internal systems

Integrating with external suppliers and third-party platforms

Building systems that process high volumes of requests and data

Designing distributed and event-driven architectures

Working with asynchronous messaging and streaming technologies

Solving problems around performance, latency, resilience and availability

Improving caching and data-access strategies

Building reliable transactional workflows

Developing applications and services within AWS

Deploying and operating containerised applications

Improving monitoring, alerting and observability

Exploring AI-assisted engineering and modern development tooling

At Senior level, you’ll be expected to understand the wider system rather than only the individual service you are working on.

You should be comfortable considering how systems behave in production, identifying failure scenarios and balancing scalability, resilience, maintainability and delivery speed.

We’re looking for strong full-stack engineers whose experience leans towards backend and platform engineering.

You’ll be a great addition to our team if you have the following skills, knowledge and experience

Strong commercial backend software engineering

C# and .NET or comparable experience building modern backend applications

Designing and developing APIs

Building distributed systems and service-oriented architectures

Developing cloud-native applications, ideally within AWS

Working with messaging, asynchronous processing or event-driven architecture

Designing reliable integrations with external or internal systems

SQL and/or NoSQL data stores

Building scalable systems handling significant traffic or data volumes

Performance optimisation, caching and latency reduction

Designing for resilience and failure

Containerisation and orchestration technologies such as Docker and Kubernetes

Observability, monitoring and operating production systems

Automated testing and modern engineering practices

We don’t expect candidates to have worked with every technology in our stack. Strong engineering fundamentals and evidence of solving comparable problems at scale are more important than matching every individual tool.

What we’re looking for at Senior level

Beyond the technologies themselves, we’re looking for someone who:

Can independently solve complex engineering problems

Thinks about the customer and commercial impact of technical decisions

Understands the trade-offs between speed, quality and long-term maintainability

Can contribute meaningfully to technical and architectural discussions

Communicates clearly with both technical and non-technical colleagues

Raises engineering standards through collaboration rather than hierarchy

Helps less experienced engineers develop

Is comfortable working in an environment where priorities and problems can change quickly

What to expect from our interview process

After a call with our Talent Acquisition Team, we will run a 3 stage interview process all on Microsoft Teams, which will consist of:

Hiring Manager meet & greet - 30 Minutes

Behavioural & ways of working - 60 Minutes

Tech Pairing & System Design - 120 Minutes, broken down into two parts (50 minutes each) with a short break and time for your questions at the end.

We want to make sure everybody has the opportunity to perform at their best. If you require any reasonable adjustments during the interview process please let the Talent Acquisition team know and they will be happy to assist.

Ways of working

Our full time hours are 37.5 per week, but we don't have rigid working hours so you can find the working pattern that's right for you. We have core working hours between 10am - 4pm, so we can collaborate and enjoy the social side of work.

We also have hybrid working so we all work from home and from our Aeroworks office in Manchester City Centre. We operate a remote-first working model, with colleagues meeting in our Manchester office one day every two weeks. Please note that all applicants must be eligible to work full-time in the UK

Our benefits

We might be biased but we think our colleagues are pretty great. They're the people that have made On the Beach what it is today and continue to make it vibrant and successful tomorrow. That's why we offer a competitive benefits package, known as our Beach Perks, to all On the Beach colleagues.

These include:

25 days holiday plus your birthday off

Generous discount on holidays, plus you will receive 2 extra days annual leave on top of your holiday allowance to use whilst you're away on your On the Beach package holiday

Access to Learnerbly learning platform, plus workshops, courses and professional qualifications

Enhanced maternity, paternity, shared parental leave and adoption pay, plus other family friendly support

Employee Assistance Programme and free access to counselling

Simplyhealth Optimise Health Plan

Company Sick Pay scheme

Regular wellbeing events

Gym discount

Share Incentive Plan (SIP)

Death in Service cover

Onsite subsidised coffee shop

The Sandbox (our very own bar)

Food and drink discounts across a number of venues in Manchester City Centre

Regular social events

Cycle to Work scheme

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