Senior Backend Software Engineer

We’re On the Beach! Since 2003, we've been rewriting the rules of how people discover, book, and experience their perfect getaway. What started as connecting people to short-haul beach holidays has evolved into something much bigger - premium beach destinations, long-haul adventures, and vibrant city breaks – and that’s just the beginning of our story. We send around two million holidaymakers on their dream breaks every year. And we're still growing. Powered by our deep-rooted entrepreneurial spirit, proprietary tech, curiosity and our incredible people, we’re accelerating - delivering best in class technology, the ultimate holiday app, and experiences that keep our customers coming back for more. Ready to build the future of travel with us? 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 servicesDeveloping APIs used by customer-facing applications and internal systemsIntegrating with external suppliers and third-party platformsBuilding systems that process high volumes of requests and dataDesigning distributed and event-driven architecturesWorking with asynchronous messaging and streaming technologiesSolving problems around performance, latency, resilience and availabilityImproving caching and data-access strategiesBuilding reliable transactional workflowsDeveloping applications and services within AWSDeploying and operating containerised applicationsImproving monitoring, alerting and observabilityExploring 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 engineeringC# and .NET or comparable experience building modern backend applicationsDesigning and developing APIsBuilding distributed systems and service-oriented architecturesDeveloping cloud-native applications, ideally within AWSWorking with messaging, asynchronous processing or event-driven architectureDesigning reliable integrations with external or internal systemsSQL and/or NoSQL data storesBuilding scalable systems handling significant traffic or data volumesPerformance optimisation, caching and latency reductionDesigning for resilience and failureContainerisation and orchestration technologies such as Docker and KubernetesObservability, monitoring and operating production systemsAutomated 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 problemsThinks about the customer and commercial impact of technical decisionsUnderstands the trade-offs between speed, quality and long-term maintainabilityCan contribute meaningfully to technical and architectural discussionsCommunicates clearly with both technical and non-technical colleaguesRaises engineering standards through collaboration rather than hierarchyHelps less experienced engineers developIs 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 offGenerous 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 holidayAccess to Learnerbly learning platform, plus workshops, courses and professional qualificationsEnhanced maternity, paternity, shared parental leave and adoption pay, plus other family friendly supportEmployee Assistance Programme and free access to counsellingSimplyhealth Optimise Health PlanCompany Sick Pay schemeRegular wellbeing eventsGym discountShare Incentive Plan (SIP)Death in Service coverOnsite subsidised coffee shopThe Sandbox (our very own bar)Food and drink discounts across a number of venues in Manchester City CentreRegular social eventsCycle to Work scheme We're On the Beach! One of the UK's largest online package holiday specialists, with significant opportunities for growth.