At FDJ UNITED, we don't just follow the game, we reinvent it. FDJ UNITED is one of Europe’s leading betting and gaming operators, with a vast portfolio of iconic brands and a reputation for technological excellence. With more than 5,000 employees and a presence in around fifteen regulated markets, the Group offers a diversified, responsible range of games, both under exclusive rights and open to competition. We set new standards, proving that entertainment and safety can go hand in hand. Here, you’ll work alongside a team of passionate individuals dedicated to delivering the best and safest entertaining experiences for our customers every day. We’re looking for bold people who are eager to succeed and ready to level-up the game. If you thrive on innovation, embrace challenges, and want to make a real impact at all levels, FDJ UNITED is your playing field. Join us in shaping the future of gaming. Are you ready to LEVEL-UP THE GAME?What you’ll work onBuild and evolve SwiftUI feature modules across the KSP stackIntegrate KSP into the Sports host app via shared contractsDesign and maintain modular SPM APIs, keeping module boundaries clean and public surfaces intentionalImplement real-time sportsbook experiences: odds/live data flows, navigation, analytics, localization, and mediaOwn quality end-to-end: unit tests, SwiftUI view tests, lint/format, CI feedback, and PR hygieneCollaborate with product, design, QA, and other platform teams on high-impact sportsbook journeysOur tech stack (what you’ll use day to day)Language & platform: Swift 5.10+, SwiftUI, iOS 17+, XcodeArchitecture: Modular Swift Packages, feature-oriented modules composed through an integration layerDependency injection: Factory (Container-based DI, test/preview-friendly registrations)Concurrency & reactivity: Structured concurrency (async/await), preference for modern Observation patternsNetworking & realtime:



REST-style providers plus MQTT/WebSocket for live offering dataTesting: Swift Testing (preferred for new tests), ViewInspector for SwiftUITooling & delivery: SwiftLint, SwiftFormat, Git hooks, Jira, GitLab, Jenkins/CI, FastlaneIdeal profileMust-have Solid commercial experience building production iOS apps or libraries in SwiftStrong SwiftUI skills: composition, navigation, state management, performance-aware UIComfortable with modular Swift Package development and multi-repo / multi-package dependency graphsPractical experience with async/await and main-actor boundaries, able to reason about concurrency bugsExperience writing unit tests and testing UI behavior (XCTest and/or Swift Testing)Ability to work in a large codebase with shared components, strict linting, and CI gatesClear communication in English and confidence collaborating across squadsNice-to-haveExperience with Factory, Resolver, or similar DI containersExposure to Combine and migration toward Observation / @ObservableRealtime systems experience (MQTT, WebSockets, push-driven UI)Sportsbook, betting, trading, or other high-frequency / odds-driven product experienceExperience embedding libraries into a host app (SDK-style delivery, integration contracts, versioning)Familiarity with analytics/tracking instrumentation, localization pipelines, or media/player SDKsComfort with GitLab, conventional PR reviews, and Jira-linked deliveryWhat success looks likeYou deliver reliable sportsbook features with clean module boundaries and predictable integrationsYou write testable,



maintainable Swift that fits existing KSP conventionsYou improve live UX quality under real conditions: odds updates, navigation, betslip flows, and streamingYou leave the codebase healthier than you found it: better tests, clearer APIs, fewer regressionsSoft skills we valueProduct mindset: you care about customer journeys, not only ticketsPragmatism: prefer simple solutions, abstract complexity only when neededOwnership: you follow work through build, test, review, and production feedbackCollaboration: you can partner with web / backend sportsbook teams and host-app iOS engineersWe believe talent knows no boundaries. Our hiring process focuses solely on your skills, experience, and potential to contribute to our team.We welcome applicants from all backgrounds and evaluate each candidate based on merit, regardless of personal characteristics as the age, gender, origin, religion, sexual orientation, neurodiversity or disability.At FDJ UNITED, we don't just follow the game, we reinvent it. FDJ UNITED is one of Europe’s leading betting and gaming operators, with a vast portfolio of iconic brands and a reputation for technological excellence. With more than 5,000 employees and a presence in around fifteen regulated markets, the Group offers a diversified, responsible range of games, both under exclusive rights and open to competition. We set new standards, proving that entertainment and safety can go hand in hand. Here, you’ll work alongside a team of passionate individuals dedicated to delivering the best and safest entertaining experiences for our customers every day. We’re looking for bold people who are eager to succeed and ready to level-up the game. If you thrive on innovation, embrace challenges, and want to make a real impact at all levels, FDJ UNITED is your playing field. Join us in shaping the future of gaming. Are you ready to LEVEL-UP THE GAME?
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📌 iOS Senior Engineer (Madrid)
🏢 Kindred People
📍 Madrid