Mobile Developer – iOS

🏢 Summary: Founding Senior Android Engineer role focused on building and scaling a secure, high-performance native Android application for a regulated financial platform. The position involves end-to-end feature ownership, defining mobile architecture, and implementing secure data handling for sensitive financial information. The engineer will shape a scalable, maintainable mobile foundation in a high-trust environment. 🗂️ Requirements: 7+ years of professional Android development experience, Proven experience building, shipping, and maintaining production Android applications at scale, Expert-level proficiency in Kotlin, Experience with modern Android frameworks (Jetpack Compose, AndroidX, Coroutines), Experience designing Android architectures (MVVM, MVI, Clean Architecture), Experience with secure data handling, encryption, and authentication flows, Ability to diagnose and resolve performance, memory, and threading issues, Experience integrating mobile apps with backend APIs, Experience implementing secure storage and session management 📃 Skills: Kotlin, Android, Jetpack, Compose, AndroidX, Coroutines, MVVM, MVI, CleanArchitecture, Encryption, Authentication, Authorization, APIs, AndroidSDK 🏢 Description: About Monstro Monstro is the operating system for governed financial intelligence. We build governance and intelligence infrastructure that enables artificial intelligence to operate safely, explainably, and at institutional scale. We exist because the level of financial guidance historically available to a small group should be accessible to many more people. By combining AI with deep institutional infrastructure, we help financial institutions deliver more personalized, responsible, and life-changing financial support to millions of individuals. We're building mission-critical systems in a highly regulated domain, and we care deeply about doing it right. If you're motivated by meaningful problems, high standards, and shaping infrastructure that improves financial outcomes, you'll feel at home here. About the Role We're looking for a founding Senior Android Engineer to help build the native Android experience for our financial platform. You'll design and deliver secure, high-performance features that help users understand and manage their financial lives, while laying the foundation for a long-term mobile architecture. This is a hands-on, collaborative role where your work will directly shape the core experience our users rely on every day. Why This Role Matters Monstro's mobile app is central to how users interact with their financial universe. Your work will help define the quality, responsiveness, and trustworthiness of that experience. The systems you build must be secure, elegant, and resilient—handling sensitive financial data at scale while remaining intuitive and reliable. What You'll Do Android Application DevelopmentDesign, build, and maintain core features using Kotlin and modern Android frameworks (Jetpack Compose, AndroidX, Coroutines). Deliver smooth, intuitive user experiences that support complex financial workflows. Own feature development end-to-end—from architecture to implementation, testing, and release. Architecture & ScalabilityEstablish architecture patterns (MVVM, MVI, Clean Architecture) that support speed, maintainability, and long-term scale. Optimize performance, responsiveness, offline/online behavior, and data persistence. Build for speed and correctness in a regulated environment. Integration & Data HandlingIntegrate mobile clients with backend APIs, financial data systems, and third-party providers. Work closely with backend engineers to shape efficient API interactions and ensure seamless real-time data flows within the app. Security & ComplianceImplement secure data handling practices required for financial applications. Ensure proper encryption, secure storage, authentication flows, and session management. Build with the rigor necessary for regulated, high-trust environments. Collaboration & ExecutionPartner with product managers, designers, and fellow engineers to deliver cohesive, user-centered features. Contribute to architectural discussions, planning, and code reviews. Support engineering excellence through documentation, testing, and raising the overall technical bar. What Success Looks Like The Android experience is fast, secure, and reliable—earning user trust through performance and clarity. The codebase is clean, scalable, and adaptable to rapid iteration and future features. Architecture patterns are consistent, documented, and adopted across mobile engineering. The app consistently meets Monstro's standards for performance, security, and usability in a regulated environment. Collaboration, documentation, and technical rigor are elevated across the team through your example. What We're Looking For 7+ years of professional Android development experience, with a proven track record of building, shipping, and maintaining production Android applications at scale Expert-level proficiency in Kotlin, with deep experience across modern Android development practices Demonstrated ownership of end-to-end Android features or full applications, from design through release and long-term maintenance Proven ability to design, implement, and evolve Android architectures (MVVM, MVI, Clean Architecture), making thoughtful tradeoffs around scalability, performance, and maintainability Extensive experience with modern Android frameworks and libraries, including Jetpack Compose, AndroidX, Coroutines, and related tooling Deep expertise in secure data handling, including encryption, authentication/authorization flows, key management, and Android platform security best practices Demonstrated ability to diagnose and resolve complex issues related to performance, memory, threading, and real-world device constraints Strong communication skills, with the ability to collaborate cross-functionally and clearly articulate technical decisions in fast-paced environments Ability to lead by example, conduct high-quality code reviews, mentor engineers, and help raise the overall technical bar Genuine passion for building high-quality software, with a continuous improvement mindset and curiosity to stay current with Android platform evolution Clear communicator who takes ownership, moves with urgency, and drives work to completion Why Monstro? Ownership & Impact: Shape the future of AI-powered finance—building a category-defining product used by consumers and institutions around the world. Experienced Team: Join a team with leadership that has a track record of scaling companies from early stage to major exits. Principles-Driven Culture: Work in a culture that values speed, ownership, and impact—what most companies achieve in 90 days, we do in 45. Comprehensive Compensation Package: Competitive salary, equity, and robust benefits package, including paid health, vision, dental, and disability coverage. Note: This role will be hybrid for those in the NYC metro Note: This role will have a start date of early to mid July Base Compensation Range (New York City): $164,000 – $205,000 *The posted range reflects the base salary for this role across the market ranges for each location. Final compensation will depend on a variety of factors, including experience, skills, internal leveling, and market conditions, and will be offered within the stated range in accordance with applicable pay transparency laws. A Note on Interviewing: We sometimes use AI note-takers to help us transcribe interview notes, so we can be more present in your interview. If you'd like to opt out of us using automatic transcribers, please note this in the free text field in your application, otherwise we'll take your application as confirmation that you're happy for us to use notetakers (whether added to video calls or in the background). Ready to Build With Us? If you're excited to contribute to a high-bar team building something meaningful, we love to hear from you!

🏢 Summary: Founding Senior Android Engineer role focused on building and scaling a secure, high-performance native Android app for a regulated financial platform. The position involves end-to-end ownership of Android features, establishing scalable architecture, and implementing secure data handling for sensitive financial information. You will shape the long-term mobile architecture and ensure performance, reliability, and compliance at scale. 🗂️ Requirements: 7+ years professional Android development experience, Expert-level Kotlin proficiency, Proven delivery of production Android applications at scale, Experience designing Android architectures (MVVM, MVI, Clean Architecture), Experience with Jetpack Compose, AndroidX, Coroutines, Strong knowledge of secure data handling and Android security best practices, Experience integrating REST APIs and real-time data flows, Ability to optimize performance, memory, and threading, Experience implementing encryption, authentication, and secure storage 📃 Skills: Kotlin, Android, Jetpack, Compose, AndroidX, Coroutines, MVVM, MVI, CleanArchitecture, REST, Encryption, Authentication, Authorization, SQLite, Gradle, Git 🏢 Description: About Monstro Monstro is the operating system for governed financial intelligence. We build governance and intelligence infrastructure that enables artificial intelligence to operate safely, explainably, and at institutional scale. We exist because the level of financial guidance historically available to a small group should be accessible to many more people. By combining AI with deep institutional infrastructure, we help financial institutions deliver more personalized, responsible, and life-changing financial support to millions of individuals. We're building mission-critical systems in a highly regulated domain, and we care deeply about doing it right. If you're motivated by meaningful problems, high standards, and shaping infrastructure that improves financial outcomes, you'll feel at home here. About the Role We're looking for a founding Senior Android Engineer to help build the native Android experience for our financial platform. You'll design and deliver secure, high-performance features that help users understand and manage their financial lives, while laying the foundation for a long-term mobile architecture. This is a hands-on, collaborative role where your work will directly shape the core experience our users rely on every day. Why This Role Matters Monstro's mobile app is central to how users interact with their financial universe. Your work will help define the quality, responsiveness, and trustworthiness of that experience. The systems you build must be secure, elegant, and resilient—handling sensitive financial data at scale while remaining intuitive and reliable. What You'll Do Android Application DevelopmentDesign, build, and maintain core features using Kotlin and modern Android frameworks (Jetpack Compose, AndroidX, Coroutines). Deliver smooth, intuitive user experiences that support complex financial workflows. Own feature development end-to-end—from architecture to implementation, testing, and release. Architecture & ScalabilityEstablish architecture patterns (MVVM, MVI, Clean Architecture) that support speed, maintainability, and long-term scale. Optimize performance, responsiveness, offline/online behavior, and data persistence. Build for speed and correctness in a regulated environment. Integration & Data HandlingIntegrate mobile clients with backend APIs, financial data systems, and third-party providers. Work closely with backend engineers to shape efficient API interactions and ensure seamless real-time data flows within the app. Security & ComplianceImplement secure data handling practices required for financial applications. Ensure proper encryption, secure storage, authentication flows, and session management. Build with the rigor necessary for regulated, high-trust environments. Collaboration & ExecutionPartner with product managers, designers, and fellow engineers to deliver cohesive, user-centered features. Contribute to architectural discussions, planning, and code reviews. Support engineering excellence through documentation, testing, and raising the overall technical bar. What Success Looks Like The Android experience is fast, secure, and reliable—earning user trust through performance and clarity. The codebase is clean, scalable, and adaptable to rapid iteration and future features. Architecture patterns are consistent, documented, and adopted across mobile engineering. The app consistently meets Monstro's standards for performance, security, and usability in a regulated environment. Collaboration, documentation, and technical rigor are elevated across the team through your example. What We're Looking For 7+ years of professional Android development experience, with a proven track record of building, shipping, and maintaining production Android applications at scale Expert-level proficiency in Kotlin, with deep experience across modern Android development practices Demonstrated ownership of end-to-end Android features or full applications, from design through release and long-term maintenance Proven ability to design, implement, and evolve Android architectures (MVVM, MVI, Clean Architecture), making thoughtful tradeoffs around scalability, performance, and maintainability Extensive experience with modern Android frameworks and libraries, including Jetpack Compose, AndroidX, Coroutines, and related tooling Deep expertise in secure data handling, including encryption, authentication/authorization flows, key management, and Android platform security best practices Demonstrated ability to diagnose and resolve complex issues related to performance, memory, threading, and real-world device constraints Strong communication skills, with the ability to collaborate cross-functionally and clearly articulate technical decisions in fast-paced environments Ability to lead by example, conduct high-quality code reviews, mentor engineers, and help raise the overall technical bar Genuine passion for building high-quality software, with a continuous improvement mindset and curiosity to stay current with Android platform evolution Clear communicator who takes ownership, moves with urgency, and drives work to completion Why Monstro? Ownership & Impact: Shape the future of AI-powered finance—building a category-defining product used by consumers and institutions around the world. Experienced Team: Join a team with leadership that has a track record of scaling companies from early stage to major exits. Principles-Driven Culture: Work in a culture that values speed, ownership, and impact—what most companies achieve in 90 days, we do in 45. Comprehensive Compensation Package: Competitive salary, equity, and robust benefits package, including paid health, vision, dental, and disability coverage. Note: This role will be hybrid for those in the NYC metro Note: This role will have a start date of early to mid July Base Compensation Range (New York City): $164,000 – $205,000 *The posted range reflects the base salary for this role across the market ranges for each location. Final compensation will depend on a variety of factors, including experience, skills, internal leveling, and market conditions, and will be offered within the stated range in accordance with applicable pay transparency laws. A Note on Interviewing: We sometimes use AI note-takers to help us transcribe interview notes, so we can be more present in your interview. If you'd like to opt out of us using automatic transcribers, please note this in the free text field in your application, otherwise we'll take your application as confirmation that you're happy for us to use notetakers (whether added to video calls or in the background). Ready to Build With Us? If you're excited to contribute to a high-bar team building something meaningful, we love to hear from you!

🏢 Summary: Senior iOS Developer role focused on leading the modernization of a secure, high performance mobile SDK for fraud prevention and customer authentication in financial services. The position involves defining architecture, implementing core SDK components, and establishing standards for distribution, testing, and security across multiple iOS environments. The role requires close collaboration with cross functional teams to ensure scalability, compliance, and performance optimization. 🗂️ Requirements: 8+ years of iOS development experience, Strong proficiency in Swift, Experience with Objective C interoperability, Experience building and maintaining reusable iOS SDKs or frameworks, Knowledge of XCFramework, Swift Package Manager, and CocoaPods, Understanding of static and dynamic linking, module stability, library evolution, Experience optimizing application size and performance, Knowledge of iOS security concepts including Keychain and Secure Enclave, Experience with Instruments for performance analysis, Experience with XCTest and XCUITest, Familiarity with code signing and provisioning processes 📃 Skills: Swift, Objective-C, Combine, async/await, XCFramework, SwiftPM, CocoaPods, Keychain, SecureEnclave, AppAttest, DeviceCheck, XCTest, XCUITest, Instruments, BGTaskScheduler 🏢 Description: Project overview The project focuses on modernizing a mobile SDK used for digital fraud prevention and customer authentication in financial services. You will contribute to building a scalable, secure, and high performance SDK designed for integration into external applications across multiple environments. Team You will work in a distributed team of iOS engineers, backend engineers, and security specialists. The team collaborates closely across regions, following shared engineering standards and participating in design reviews and system level discussions. Position overview We are looking for a Senior iOS Developer who can lead technical design and implementation for an iOS SDK modernization initiative. You will define architecture, validate migration strategies, develop proof of concept components, and establish engineering standards for distribution, testing, and security. Technology stack Swift, Objective C, Combine, async await, XCFramework, Swift Package Manager, CocoaPods, Keychain, Secure Enclave, App Attest, DeviceCheck, XCTest, XCUITest, Instruments, BGTaskScheduler Responsibilities Lead technical design and implementation of iOS SDK components Define and maintain architecture aligned with enterprise standards Develop proof of concept solutions to validate design approaches Ensure SDK compatibility across multiple iOS versions and devices Establish guidelines for SDK distribution, integration, and versioning Collaborate with cross functional teams on security and compliance requirements Optimize application performance, memory usage, and energy efficiency Implement secure coding practices and support data protection mechanisms Drive testing strategies including unit, integration, and UI testing Contribute to code reviews and support engineering best practices Requirements 8+ years of experience in iOS development Strong proficiency in Swift and experience with Objective C interoperability Experience building and maintaining reusable iOS SDKs or frameworks Understanding of framework distribution using XCFramework, Swift Package Manager, and CocoaPods Knowledge of static and dynamic linking, module stability, and library evolution Experience managing dependencies and optimizing application size and performance Understanding of iOS security concepts including Keychain, Secure Enclave, and certificate pinning Familiarity with privacy and App Store compliance standards Experience with background execution models and related constraints in iOS Knowledge of performance analysis tools such as Instruments Experience with testing frameworks including XCTest and XCUITest Familiarity with code signing, provisioning, and distribution processes Nice to have Experience working in financial services or regulated environments Exposure to sensor data processing such as CoreMotion or gesture handling Experience contributing to enterprise architecture standards Background in security focused application development What We Offer: Vacation days : Up to 26 business days per year. 10 illness/special days off per year (fully paid, no medical papers needed) for all contract types Health and life insurance (Luxmed) MyBenefit platform with Multisport option Internal psychological support service English language classes from the first working day Access to external learning platforms : O’Reilly, LinkedIn Learning, Udemy, and a wide catalog of diverse internal training Flexible workplace : work from the office, from home, or choose a hybrid option Tech Skills Mentoring Program Opportunities to develop as a public speaker, mentor, or technical interviewer Fully paid idle (bench) when not involved in a project Certification reimbursement (AWS, GCP, Microsoft, etc.)

🏢 Summary: The offer is for an experienced iOS Engineer to build and evolve a production-grade consumer voice application on iOS, with full ownership over architecture, performance, and product quality. The role covers end-to-end mobile development using Swift, close collaboration with backend and AI teams, and delivering polished, real-time user experiences. It focuses on scalable architecture, reliability, and high engineering standards in a fast-growing product environment. 🗂️ Requirements: 2+ years of iOS development experience with Swift, Strong knowledge of Swift fundamentals including async/await and memory management, Commercial experience with SwiftUI and/or UIKit, Experience with networking and API integration, Experience with local storage solutions (Core Data, SQLite, Realm or similar), Experience with Git workflows, Experience with CI/CD for mobile applications, Strong understanding of application architecture and testing 📃 Skills: Swift, SwiftUI, UIKit, CoreData, SQLite, Realm, Git, CICD, Xcode, GitHubActions, Fastlane, TestFlight, APIs, AsyncAwait 🏢 Description: For our client, a fast-growing team building a modern consumer voice product on iOS, we are looking for an experienced iOS Engineer to join a small, high-performing product team. This is not a founding role, but it is a key product and engineering position with real ownership and impact on the direction of the mobile experience. About the role You will be responsible for building and maintaining a high-quality iOS application in Swift, using SwiftUI where appropriate and UIKit when needed. This is an end-to-end role covering architecture, product quality, performance, and polished user interactions. You will work closely with backend and AI teams to deliver fast, reliable, and delightful mobile experiences. Responsibilities iOS Development Build and maintain a production-grade iOS application in Swift Use SwiftUI where it makes sense and UIKit when required Design clean, scalable, and testable architecture with clear module boundaries Implement offline-first flows, local persistence, and reliable synchronization Build real-time experiences involving live state and streaming updates Optimize app performance, including smooth scrolling, fast cold starts, and efficient background execution Implement deep links, push notifications, and in-app messaging Integrate analytics, logging, and crash reporting tools Support reliable App Store releases, phased rollouts, and feature flagging Product & Craft Collaborate closely with designers to deliver polished, accessible, pixel-perfect UI Translate ambiguous product ideas into clear scopes, iterations, and shipped features Document important technical decisions and trade-offs Partner with backend teams to define APIs, error handling, and end-to-end reliability Quality & Security Write unit, integration, and UI tests with a strong quality mindset Maintain code quality standards through linting, formatting, and static analysis in CI Apply best practices around privacy, secure storage, and permissions Carefully evaluate dependencies and minimize security risks where possible Requirements Must-have 2+ years of experience in iOS development using Swift Strong understanding of Swift fundamentals, including async/await, memory management, and performance optimization Commercial experience with SwiftUI and/or UIKit Solid understanding of networking, API integration, and resilient error handling Experience with local storage solutions such as Core Data, SQLite, Realm, or similar Familiarity with Git workflows and CI/CD processes for mobile applications Strong fundamentals in application architecture, testing, and delivery Nice to have Experience working with audio, speech, or real-time streaming UX Exposure to modularization or shared business logic Familiarity with observability tools such as Sentry or Crashlytics Experience working on high-traffic consumer applications Example stack Mobile: Swift, SwiftUI, UIKit Backend / AI: modern APIs, real-time systems, cloud infrastructure Tooling: Xcode, GitHub Actions, Fastlane, TestFlight

🏢 Summary: Senior iOS Engineer role focused on developing and maintaining a large-scale, business-critical mobile application with strong emphasis on architecture, scalability, and performance. The position involves owning architectural decisions, ensuring high code quality, and contributing to long-term evolution of the iOS platform. You will collaborate cross-functionally while building scalable features integrated with backend services. 🗂️ Requirements: Strong expertise in iOS SDK across multiple iOS versions and device configurations, Deep understanding of MVVM and Clean Architecture, Advanced proficiency in Swift, Experience with Xcode and Apple development ecosystem, Experience with Git version control, Experience integrating RESTful APIs, Ability to write and maintain unit tests, Understanding of UI design principles and UX best practices, Knowledge of TypeScript 📃 Skills: Swift, iOS, SDK, MVVM, CleanArchitecture, Xcode, Git, REST, JSON, UnitTesting, TypeScript, UI, UX 🏢 Description: We are looking for an experienced Senior iOS Engineer to join a large-scale mobile product environment where engineering quality, architecture ownership, and performance at scale are critical. You will work on a mature, business-critical mobile application used daily by a broad user base. The role requires a strong technical foundation, architectural awareness, and the ability to contribute to long-term evolution of the mobile platform. This is not a feature-only position - we’re looking for someone who understands system design, maintainability, and performance in complex production environments. What You’ll Be Responsible For Designing and developing scalable iOS features with long-term maintainability in mind Contributing to architectural decisions and enforcing Clean Architecture standards Ensuring high code quality, test coverage, and performance optimization Integrating with RESTful services and collaborating with backend teams Working closely with Product, Design, and other mobile engineers Supporting continuous improvement of engineering standards and development practices Must Have Strong expertise in iOS SDK , multiple iOS versions, and device configurations Deep understanding of MVVM and Clean Architecture Advanced proficiency in Swift Excellent command of Xcode and Apple development ecosystem Experience with Git version control Practical experience integrating RESTful APIs and working with JSON Ability to write and maintain unit tests Understanding of UI design principles and UX best practices Knowledge of TypeScript Strong communication skills and ability to collaborate in cross-functional teams.

🏢 Summary: The role is for an iOS Engineer contributing to core mobile features across Math, Notifications, or Core App Performance teams, building and optimizing native iOS applications used by millions of learners. The position involves end-to-end feature development, performance improvements, experimentation, and collaboration with cross-functional teams. Engineers are expected to deliver production-quality Swift code and help drive technical excellence. 🗂️ Requirements: Bachelor's degree in Computer Science or related technical field, Strong foundation in data structures, algorithms, and software design, Professional programming experience in Swift, Experience developing native iOS applications, Ability to design clean and maintainable APIs, Experience with multithreaded programming, Experience writing unit tests and testable code, Knowledge of iOS performance optimization tools and techniques 📃 Skills: Swift, iOS, Cocoa, CocoaTouch, SDK, Xcode, Multithreading, UnitTesting, APIs, Algorithms, DataStructures 🏢 Description: Our mission at Duolingo is to develop the best education in the world and make it universally available. It's a big mission, and that's where you come in! At Duolingo, you'll join a team that cares about finding innovative solutions to complex technical problems, running countless experiments (300+ at a time!) with our massive user base to make data-driven decisions, and educating our users and employees alike. You'll have limitless learning opportunities, mentorship and collaboration with world-class minds, and a variety of projects with large scopes — while doing work that's both fun and meaningful. Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world. About the role We are hiring for multiple levels for any one of the following teams. Leveling is usually determined once all interviews are completed. Math Team As an iOS engineer on the Math team, you will help build the technology that changes how people around the world learn Math. The features that you ship will help learners to develop core math skills in a fun, engaging way. We're looking for engineers who love building new products and features. Notifications TeamAs an iOS engineer on the Notifications team, you will build features that empower learners to build long-term habits by improving how we schedule, personalize, and deliver notifications. You will design and implement meaningful notification experiences while collaborating with backend, data science, and product teams. Notifications are fundamental to Duolingo, and we're looking for engineers who are energized about experimenting and shipping features end-to-end. Core App Performance TeamThe Core App Experience team is in charge of improving the user experience in core flows of the iOS and Android apps to drive user growth. Sitting in between the intersection of technical and product work, you will drive technical improvements in app open, session start and end, and improving the offline experience. We're looking for engineers who are willing to deep dive into the codebase and provide their suggestions on how to improve the everyday experience of our users. You will... Collaborate on software projects with product design and backend aspects Develop, release, and maintain native iOS applications, primarily in Swift Mentor and set technical direction for junior engineers across the company ✅ You have... A Bachelor's degree in Computer Science or a related technical field A solid foundation in computer science with strong competencies in data structures, algorithms, and software design Programming experience in Swift ⭐ Exceptional candidates will have... Strong proficiency in Swift, with proven ability to build and maintain production-level applications Strong technical knowledge of iOS mobile application development for iPhone/iPad using Swift with Cocoa Touch and related frameworks Experience designing clean and maintainable APIs Experience with multithreaded programming Experience writing unit tests and testable code Knowledge of iOS SDK performance tools and optimization techniques We post a multi-level salary range for all of our roles. This is not inclusive of the rest of our awesome portfolio that includes equity compensation and world-class benefits. Our salary ranges are the same for all US locations. Your recruiter can share more details about the range for a specific level during the hiring process. The actual salary within the range is determined by many factors including but not limited to, skills, experience, education, and internal equity.Salary Range: $177,700—$240,400 USDTake a peek at how we care for our employees' holistic well-being with our benefits here. We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact accommodations@duolingo.com. Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. By applying for this position your data will be processed as per the Duolingo Applicant Privacy Notice. Unfortunately, there is a rise in scammers pretending to be real Duolingo employees. Duolingo and our employees will never ask for your Social Security number, bank details, or passport info, and we'll never ask you to deposit a check, purchase equipment, or exchange money during the interview process. Real Duolingo employees always use an email that ends in @duolingo.com or @recruiting.duolingo.com. Stay alert and double-check these details before sharing any information. Sign up for job alerts here.

🏢 Summary: Senior iOS Engineer role focused on leading the end-to-end development of an AI-driven healthcare mobile application evolving into a full healthcare management platform. The position offers high ownership over mobile architecture, close collaboration with product, and responsibility for building secure, production-ready Swift features in a small, fast-moving team. It emphasizes pragmatic delivery, performance, usability, and security in a real-world healthcare environment. 🗂️ Requirements: Senior-level experience in software engineering, Strong expertise in native iOS development, Proficiency in Swift, Solid understanding of software architecture, Solid understanding of system design principles, Ability to deliver high-quality solutions pragmatically and quickly, Experience implementing secure coding practices 📃 Skills: Swift, iOS, Firebase, AI, Mobile, Security 🏢 Description: We’re building a next-generation AI-driven healthcare application and evolving it into a full-scale healthcare management platform. The focus is simple: ship meaningful features fast, keep things secure, and build software that actually solves real-world problems in healthcare—not theoretical architecture diagrams. We’re looking for a Senior iOS Engineer (Swift) who wants ownership, impact, and close collaboration with product in a small, highly focused team. What you’ll be doing You’ll take a leading role in shaping and delivering our iOS application end-to-end. This isn’t a “just implement tickets” role—you’ll own the mobile experience and help define how it evolves. Own the implementation and ongoing development of the iOS app Build practical, production-ready features in Swift with a strong focus on performance and usability Design architecture that is clean, adaptable, and avoids unnecessary complexity Work closely with product teams to translate ideas into working solutions quickly Ensure security best practices are embedded into everything you build, including vulnerability awareness and mitigation Help evolve the app as it grows into a broader healthcare platform What we’re looking for Must-haves: Experience as a Senior Software Engineer (or equivalent hands-on senior role) Strong expertise in native iOS development using Swift Solid understanding of software architecture and system design principles Ability to balance engineering quality with fast, pragmatic delivery Nice-to-haves: Startup experience where you’ve worn multiple hats Familiarity with Firebase or similar mobile backend tools Exposure to regulated environments (healthcare, finance, etc.) Experience with AI-native mobile features or growth-focused mobile products Why this role is interesting You’ll work on a real AI healthcare product with real-world impact Small, focused 5-person engineering team —no bureaucracy Direct collaboration with product (fast decisions, tight feedback loops) High ownership and autonomy over mobile architecture and delivery Remote-first and flexible working setup Opportunity to shape a platform from early-stage to scale

🏢 Summary: Senior iOS Developer role focused on designing and implementing advanced mobile applications across healthcare, banking, media, and other industries. The position involves building new features in Swift, maintaining CI/CD pipelines, ensuring code quality, and collaborating on scalable architectures. The offer includes personalized project matching, professional development plans, and dedicated training support. 🗂️ Requirements: Minimum 5 years of experience in iOS mobile application development, Expertise in Swift and Xcode, Proficiency with SwiftUI, UIKit, CocoaPods, SPM or Carthage, Knowledge of Clean Swift, MVVM and MVC architectural patterns, Understanding of UI design patterns and principles, Advanced spoken and written English, Fluent Polish, Residence in Poland 📃 Skills: Swift, Xcode, SwiftUI, UIKit, CocoaPods, SPM, Carthage, CI/CD, CleanSwift, MVVM, MVC, iOS 🏢 Description: As our employee, you will have the opportunity to be part of our community of over 80 Mobile Technology Developers. Our experts are working on a wide range of projects in industries such as healthcare (e.g., the creation of apps to support the lives of citizens), banking (banking apps for individual and corporate customers), media (mobile apps for the presentation of news), loyalty, and many more! To learn the latest technologies, our Mobile Engineers create internal projects for their own development. They have a personalized training offer and an internal development plan (e-training, book publications, dedicated access to training platforms), a training budget, and the support of a mentor. Our candidates receive a personalized offer that matches their career plan and preferences, with many different projects to choose from. Your tasks Designing and implementing mobile applications for the iOS platform Creating new functionalities in Swift Maintaining and developing CI/CD systems in the project Collaborating with other team members to design new functionalities Taking care of the code quality Testing the developed functionalities Creating project documentation in accordance with applicable standards Requirements At least 5 years of experience in mobile application development for the iOS platform Expertise in Swift and Xcode Proficiency with SwiftUI, UIKit, CocoaPods / SPM / Carthage Knowledge of architectural patterns: Clean Swift, MVVM, MVC Familiarity with user interface design patterns and principles An advanced level of spoken and written English Fluent Polish required Residing in Poland required What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Opportunity for a Senior iOS Developer to design and build mobile applications across various domains, implementing new features in Swift and maintaining CI/CD pipelines. The role focuses on high-quality code, architectural best practices, testing, and collaboration within a mobile engineering team. 🗂️ Requirements: Minimum 5 years of experience in iOS mobile application development, Strong expertise in Swift and Xcode, Proficiency in SwiftUI and UIKit, Experience with dependency managers: CocoaPods, SPM or Carthage, Knowledge of architectural patterns: Clean Swift, MVVM, MVC, Experience with CI/CD systems, Understanding of UI design patterns and principles, Experience in testing and maintaining code quality 📃 Skills: iOS, Swift, Xcode, SwiftUI, UIKit, CocoaPods, SPM, Carthage, CleanSwift, MVVM, MVC, CICD 🏢 Description: As our employee, you will have the opportunity to be part of our community of over 80 Mobile Technology Developers. Our experts are working on a wide range of projects in industries such as healthcare (e.g., the creation of apps to support the lives of citizens), banking (banking apps for individual and corporate customers), media (mobile apps for the presentation of news), loyalty, and many more! To learn the latest technologies, our Mobile Engineers create internal projects for their own development. They have a personalized training offer and an internal development plan (e-training, book publications, dedicated access to training platforms), a training budget, and the support of a mentor. Our candidates receive a personalized offer that matches their career plan and preferences, with many different projects to choose from. Your tasks Designing and implementing mobile applications for the iOS platform Creating new functionalities in Swift Maintaining and developing CI/CD systems in the project Collaborating with other team members to design new functionalities Taking care of the code quality Testing the developed functionalities Creating project documentation in accordance with applicable standards Requirements At least 5 years of experience in mobile application development for the iOS platform Expertise in Swift and Xcode Proficiency with SwiftUI, UIKit, CocoaPods / SPM / Carthage Knowledge of architectural patterns: Clean Swift, MVVM, MVC Familiarity with user interface design patterns and principles An advanced level of spoken and written English Fluent Polish required Residing in Poland required

🏢 Summary: iOS Engineer role focused on developing and maintaining high-performance in-app navigation and inspirational shopping features, ensuring stability, compliance, and reliability of critical user journeys. The position involves working with modular architecture, implementing testing strategies, and leveraging AI-assisted tools to enhance development processes. 🗂️ Requirements: Very good knowledge of Swift, Strong knowledge of iOS SDK, Experience with Modular Architecture in production, Experience with unit testing, Experience with E2E testing, Experience with AI-assisted development tools, Ability to ensure app stability and incident management, Knowledge of accessibility and Apple platform requirements, Polish language proficiency at C1 level or higher 📃 Skills: Swift, iOS, SDK, ModularArchitecture, UnitTesting, E2ETesting, Sentry, Kubernetes, Docker, Consul, GitHub, GitHubActions, AI 🏢 Description: About the job: In the Consumer domain, our area is responsible for in-app navigation and elevating the inspirational experience within the app. We carefully design, develop, and release high-performance solutions - working closely with the Home Page and Search domains - to provide a fast, reliable, and engaging customer experience. Currently, we are looking for a skilled iOS Engineer to join the Fennec team , focusing on the Inspirational Shopping initiative. You will be a key player in ensuring the stability and evolution of our user journeys, driving product discovery, and creating a truly inspiring shopping experience for our users. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 14 600 - 20 825 Annual bonus based on your annual performance and company results. Our team is based in Warsaw and Poznań. This is the right job for you if you: Have very good knowledge of Swift and the iOS SDK . Know and have worked in production environments with Modular Architecture . Have experience with unit testing and E2E testing to ensure the reliability of the critical purchase path. Are open to learning and collaborating closely with backend technologies and product teams. Think outside the box and have a broad perspective on your work. Want to be proud of the code you write and are willing to share knowledge during code reviews . Have experience using AI-assisted tools (e.g. code generation, debugging or prototyping) and can demonstrate a project or initiative where AI supported your development process. Can search for efficient solutions to meet users' requirements. Know Polish at C1 level or higher. In your daily work you will handle the following tasks: Strategic Feature Delivery: You will actively contribute to the iOS development of key products within our area, including in-app navigation and driving discovery & inspiration within the app. iOS Platform Reliability: Guaranteeing the stability of users navigation path through Sentry log audits, meeting Mobile Tech Radar requirements, and rigorous incident management. Compliance: Ensuring absolute alignment with legal and technical requirements, including the Omnibus directive, accessibility guidelines and support latest Apple requirements - like Liquid Glass . What's in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!