{"id":3098093,"url":"https://alion.io/job/monzo-senior-ios-engineer","title":"Senior iOS Engineer","company":{"id":5428,"name":"Monzo","domain":"monzo.com","url":"https://alion.io/company/monzo","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":78,"open_postings":35,"ghost_share":0,"stale_share":0.886,"repost_share":0,"time_to_fill_p50_days":24,"computed_at":"2026-10-24T06:02:35Z"}},"role":"Mobile","role_family":"Mobile","seniority":"senior","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Barcelona, Spain"],"countries":["ES"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":62000,"max_usd":153000,"period":"year","method":"role_seniority_country_cell","sample_n":9},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Alamofire","optional":false},{"name":"MVVM","optional":false},{"name":"Sentry","optional":false},{"name":"Swift","optional":false},{"name":"SwiftUI","optional":false},{"name":"XCUITest","optional":false}],"status":"live","first_seen_at":"2025-03-06T11:35:14Z","employer_posted_date":"2026-10-22","last_verified_at":"2026-10-24T09:22:38Z","board_verified":true,"closed_at":null,"days_open":596,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":596},"description":"We’re on a mission to make money work for everyone.\nWe’re waving goodbye to the complicated and confusing ways of traditional banking.\nAfter starting as a prepaid card, our product offering has grown a lot in the last 10 years in the UK. As well as personal and business bank accounts, we offer joint accounts, accounts for 16-17 year olds, a free kids account and credit cards in the UK, with more exciting things to come beyond. Our UK customers can also save, invest and combine their pensions with us. \nWith our hot coral cards and get-paid-early feature, combined with financial education on social media and our award winning customer service, we have a long history of creating magical moments for our customers!\nWe’re not about selling products - we want to solve problems and change lives through Monzo\nBarcelona, Spain | Base salary for this role is depending on experience + Incentive Awards tied to your performance + benefits \nHybrid model: 3 days a week in the office\nOur mobile engineers have a variety of different backgrounds\nThere are ~60 iOS engineers at Monzo and we’re looking for more to join the team. We have several non-graduates; only some of us studied Computer Science; some of us have worked in huge companies; some have only ever worked in startups; others are former consultants. As long as you enjoy learning new things, we’d love to talk to you.\nMonzo works in small, interdisciplinary teams\nWe have around 650 engineers out of roughly 5,500 people in total - and we have big ambitions. There are many interesting challenges ahead, and we're happy for people to move between teams or to specialise, whatever you prefer. As an engineer here you'd be able to work directly with anyone across the company, and we run regular knowledge-sharing sessions so you’ll learn heaps about everything from how banks work to effective communication.\nWe contribute to open source software as much as possible. Our blog is a good place to learn even more about what we do!\nYou’ll play a key role by...\nWe’re searching for product-focused iOS engineers to evolve our native mobile app. You’ll take pride in building polished user experiences, and you’ll balance the need for well-tested resilient code with moving fast and iterating. \nYou’ll be working on a product that is a part of day to day life for more than 11 million people already, and your work here will shape the way that people interact with their finances.\nAs an iOS Engineer at Monzo you'll work in a small, autonomous product squad alongside Android Engineers, Backend Engineers, User Researchers, Product Designers, Product Managers, QA Testers, and Data Scientists.\nYou and your team will be responsible for an overall company goal, rather than building a specific feature - you'll have the opportunity to have impact on both what we build, and how we build it. Mobile engineers at Monzo work on everything from the personal banking product to customer support tools. We also have a small mobile platform squad dedicated to enabling other engineers to move faster.\nEvery week we meet as an iOS discipline to discuss tools, techniques, problems we're encountering across the company and work together to improve our codebase and processes.\nYou'll report to an engineering manager who will meet with you every 1-2 weeks 1:1. They’re dedicated to helping you grow and develop as an engineer.\nOur iOS app\nOur app is 100% Swift and our latest features are built in SwiftUI and using elements of The Composable Architecture. Historically we built using a Model, View, View-Model architecture (MVVM). We use Coordinators to ensure we can re-use flows wherever possible, and avoid tightly coupling one screen to another. We make heavy use of protocols and extensions throughout our app.\nOur networking stack is built upon Alamofire, using a generic interface to easily de-serialise objects of a certain type, and we mirror our backend micro-service architecture by building individual services to house our API logic. We log liberally to get alerted when they’re triggered in Sentry which we also use to monitor crashes.\nOur testing stack comprises of unit tests for business logic, stubbed API tests for pseudo-integration tests, snapshot tests for UI, and XCUITest for testing user input and sequencing.\nWe've published some talks and blog posts about how we work:\nWorking with backend services on iOS\nPushing Protocols to their Limits\nOur mobile release process: An illustrated story\nWhat we’ve learnt building a design system in SwiftUI\nWe’d love to hear from you if…\nYou care about the impact your work has on our customers, and optimise for outcomes rather than the number of lines of code you output\nYou’re excited about and have experience in programming in Swift\nYou’ve shipped and iterated on at least one app in the App Store\nYou have a product mindset: you care about customer outcomes and you want to make data-informed decisions\nYou love turning excellent design into beautiful products\nYou’re comfortable working in a team that deals with ambiguity\nYou have an understanding computer science principles\nWhat’s in it for you:\nBase salary for this role is depending on experience + Incentive Awards tied to your performance + benefits \nBarcelona, ESP\nWe offer flexible working hours and trust you to work enough hours to do your job well, at times that suit you and your team.\nLearning budget of €1,200 a year for books, training courses and conferences\n The application journey has 3 key steps\nOur interview process involves three main stages: \nInitial Call \nTake home task or pair coding exercise \nFinal interview including a system design and a behavioural interview \nThis process should take around 2-3 weeks - your schedule is really important to us, so we promise to be as flexible as possible! \nWe have some guidelines on using Artificial Intelligence (AI) to ace an application and interview at Monzo. You can read them here.\nThere’s a detailed blog on the interview process, for extra details, hints and tips.\nWe’ll only close this role once we have enough applications for the next stage. Please submit your application as soon as possible to make sure you don’t miss out. \nIf you're successful in applying for this role, we'll work with you to find a start date. In some cases, there might be a delay in when you can be released from your current role so that we can make sure things continue to run smoothly. We’ll be sure to communicate this with you and keep you updated.\nLI-BJ1\nEqual opportunities for everyone\nDiversity and inclusion are a priority for us and we’re making sure we have lots of support for all of our people to grow at Monzo. At Monzo, we’re embracing diversity by fostering an inclusive environment for all people to do the best work of their lives with us. This is integral to our mission of making money work for everyone. You can read more in our blog, 2026 Diversity and Inclusion Report and 2025 Gender Pay Gap Report.\nWe’re an equal opportunity employer. All applicants will be considered for employment without attention to age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, or veteran, neurodiversity or disability status.\nIf you have a preferred name, please use it to apply. 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