Known is looking for a Mobile QA Engineer in San Francisco, CA to help maintain high standards for our mobile applications. This position works closely with engineers, designers, and product managers to ensure every release meets our quality expectations. What you will do Develop and carry out detailed test plans for mobile apps Work with cross-functional teams to identify and document defects Support the team in delivering reliable, high-performing mobile experiences Requirements Experience with mobile application testing Ability to create and execute thorough test plans Strong communication and collaboration skills This role focuses on ensuring quality and performance across our mobile products. Candidates who care about mobile technology and want to help shape user experience will find this work meaningful.

airapps is hiring a Mobile DevOps Engineer in San Francisco. This role centers on improving how mobile applications are built, tested, and delivered. Role overview The Mobile DevOps Engineer will focus on refining and maintaining development and deployment workflows for mobile apps. Working alongside teams from different disciplines, this position supports continuous integration and continuous delivery (CI/CD) pipelines to keep releases running smoothly and efficiently. What you will do Streamline mobile application development and deployment processes Collaborate with cross-functional teams to improve automation Enhance and maintain CI/CD pipelines for mobile projects Requirements Experience with mobile application DevOps practices Interest in automation and workflow optimization Ability to work closely with diverse technical teams

About AnythingAnything is revolutionizing how entrepreneurs develop applications with our cutting-edge AI product. Our platform transforms English commands into fully functional apps, encompassing everything needed to monetize online ventures—mobile, web, design, AI, backend, infrastructure, and payment solutions. Since our launch on August 7th, we have achieved a remarkable $5 million in revenue and continue to grow rapidly. Discover more at anything.com.Role OverviewWe are seeking a talented and experienced Mobile Engineer who is passionate about crafting exceptional mobile experiences. Collaborating closely with our design team, you will help shape the user experience through your innovative coding solutions. Your vision of a “superior” mobile experience will guide your work, and you will have the autonomy to bring that vision to life.ResponsibilitiesExecute pixel-perfect implementations of design specificationsDevelop intuitive gestures to enhance user engagementBalance considerations of speed, accuracy, and long-term sustainabilityEngage with users and utilize the product to identify real-world needs and opportunitiesEmbrace challenging tasks to expand your skill set rapidlyFoster a culture of ownership, ambition, and continuous learningOur approach to mobile coding is pioneering, and we greatly value creativity, courage, and flexibility in revising solutions through iterative processes.Success MetricsYour performance will be evaluated based on:1. Self-sufficient problem-solving and executionYou proactively tackle goals, explore uncertainties, assess options, and deliver effective solutions independently.2. Rapid skill progressionYou broaden your technical expertise significantly within the initial months through hands-on projects and intentional learning.3. Impactful product contributionsYour features enhance user satisfaction, application performance, and overall product sophistication in quantifiable and strategic manners.Candidate ProfileIdeal candidates will possess:A solid technical base from a prestigious computer science program or equivalent practical experience with React Native applicationsDemonstrated high standards in mobile user experiencesStrong empathy towards team members and users alike

Padlet is dedicated to enhancing education through innovative software solutions. We believe that education should spark curiosity, creativity, and a sense of community. Our tools empower visual content creation and collaboration in millions of classrooms around the globe.As mobile devices become the primary computing tool for many, we are seeking talented Mobile Engineers to elevate our mobile applications and positively impact a billion lives.Key ResponsibilitiesDeveloping exciting new features for our iOS and Android applications, such as a voice recorder with audio effects.Enhancing app performance and reliability, e.g., optimizing network calls to handle unstable internet connections.Streamlining our development processes, such as improving our internationalization pipelines to support translations into over 40 languages.QualificationsProven track record of writing high-quality code recognized by peers.Proficient in utilizing resources like Stack Overflow effectively.Bonus: A great sense of humor is a plus!

Join Airwallex as a Senior Mobile EngineerAt Airwallex, we are redefining the future of global payments and financial solutions. As a Senior Mobile Engineer, you will play a pivotal role in shaping our state-of-the-art mobile applications for both iOS and Android platforms, focusing on delivering an outstanding user experience.Your expertise will drive the development of fully integrated solutions that empower over 200,000 businesses worldwide to efficiently manage their global payments, expenses, and banking needs. You will work with cutting-edge technologies such as SwiftUI, Combine, and Async/Await for iOS, and AndroidX, Coroutines, Hilt, along with various Jetpack libraries for Android.Join a dynamic team of innovators who are passionate about building the future of finance. If you are eager to tackle complex challenges, collaborate with exceptional teammates, and take ownership of your work, we want to hear from you!

About UsAt Sierra, we are on a mission to revolutionize customer experiences through innovative AI solutions. Based in the vibrant city of San Francisco, our company is expanding its reach with offices in Atlanta, New York, London, France, Singapore, and Japan, promoting a collaborative and inclusive workplace.We uphold a strong set of core values that define our culture: Trust, Customer Obsession, Craftsmanship, Intensity, and Family. These principles guide our actions and drive us to consistently deliver exceptional results.Our co-founders, Bret Taylor and Clay Bavor, bring a wealth of experience from their previous roles at industry-leading companies such as Salesforce and Google, shaping the future of technology with their visionary leadership.The RoleWe are seeking a talented Mobile Software Engineer with expertise in iOS and/or Android development to take ownership of our Experience SDKs—the essential components that allow clients to seamlessly integrate Sierra’s chat and voice functionalities into their mobile applications.As the technical lead for mobile development at Sierra, you will oversee the user interface, animations, voice interactions, performance enhancements, and deep OS integrations, collaborating closely with design and frontend teams to ensure a cohesive and delightful mobile experience.What You’ll DoManage our Mobile Experience SDKs for iOS and Android. Spearhead the architecture, implementation, and ongoing development of our native SDKs, making the integration process effortless for other engineers and providing an exceptional user experience.Enhance OS-level interactions. Leverage platform-native capabilities to improve functionalities such as notifications, background execution, audio routing, app extensions, and deep links, ensuring that our agents feel seamlessly integrated within each platform.Create outstanding mobile interfaces. Collaborate with designers and engineers to develop visually appealing and highly functional mobile user interfaces that elevate the overall user experience.

About LeonaAt Leona, we are dedicated to revolutionizing healthcare access and empowering individuals to take proactive control of their health. Our ambition is to change the global healthcare landscape, ensuring that everyone can receive top-notch care regardless of their location. Patients should feel confident and supported in managing their health, while doctors can focus on delivering exceptional care with reduced administrative burdens.We are paving the way for a new era of doctor-patient interactions through our innovative platform that utilizes WhatsApp for seamless communication. Our solution acts as a clinical assistant, automating non-urgent tasks and providing patients with 24/7 access to their healthcare providers.Headquartered in San Francisco and Mexico City, our diverse team boasts extensive experience from industry leaders like Rappi, Uber, and Modern Fertility, backed by esteemed investors such as General Catalyst and Accel.If you are eager to learn, innovate, and contribute to a transformative startup environment, we invite you to explore this exciting opportunity!

Founding Engineer (Unity Mobile)Pax Historia is revolutionizing gameplay by leveraging cutting-edge generative AI technology. Our innovative platform seamlessly combines the intricacies of grand strategy with the limitless creativity of a sandbox environment, all while being energized by a dedicated community that actively creates and remixes scenarios.Our community is vibrant, publishing hundreds of scenarios daily and engaging in millions of gameplay sessions each week, with rapid growth on the horizon. Supported by prominent investors such as Y Combinator, Pace Capital, and Z Fellows, your contributions will directly impact a product enjoyed by hundreds of thousands of players.The RoleWe are seeking a founding-level Unity developer to spearhead the development of our native mobile application. This role requires full-time, in-person work in our San Francisco office located in Dogpatch, where you will collaborate closely with the co-founders.Current Position Overview:A web-based game with significant product-market fit, particularly within the alternate-history genre.Hundreds of thousands of users are eagerly anticipating a native mobile experience.A well-documented TypeScript codebase with clear data models and API patterns for integration.No existing Unity codebase; you will be architecting the system from the ground up.Your Key Responsibilities:Developing the core gameplay loop for iOS and Android, including features such as an interactive map, action submissions, event viewing, and AI-driven chat.Creating a high-performance 2D map rendering system capable of displaying thousands of regions with smooth panning, zooming, and animated territorial changes.Building a consistent UI component library that aligns with our web design system (custom components, Poppins typography, dark/light modes).Integrating with our Firebase/Supabase backend and AI services through REST APIs.Implementing push notifications and deep linking to enhance user engagement.Optimizing the application for lower-end mobile devices and memory-constrained environments.In summary, your contributions will propel Pax Historia into the mobile realm and unlock our next phase of growth.

At Lyft, we are driven by our mission to connect communities and enhance mobility. We focus on fostering an open, inclusive, and diverse culture that empowers our teams. As part of our Mobile Foundations team, you will play a pivotal role in developing robust software solutions that tackle large-scale challenges, ensuring our mobile applications are not only stable but also scalable and efficient.In your role as a Senior Android Engineer, you will be responsible for creating and maintaining the core systems that serve as the backbone for all Lyft mobile engineers. Your contributions will enable teams across the organization to deliver exceptional experiences that seamlessly connect people and places. You will be instrumental in building scalable infrastructure that accelerates innovation while prioritizing an outstanding developer experience. Your efforts will directly enhance the stability of Lyft as a whole.Our mobile applications are utilized by millions, and we take pride in maintaining high development standards. We follow best practices in code architecture and embrace rapid release cycles. Our codebase is primarily written in Kotlin, leveraging modern design patterns and coding practices. We also actively engage with the developer community, contributing to open-source projects, including the Kotlin language itself.

About Our TeamAt OpenAI, we are developing a robust Swift platform, from architecture to continuous integration, that empowers hundreds of engineers and their agents to innovate within ChatGPT, Atlas, Sora, and various other rapidly advancing applications. Our mission is to enable teams to expedite development while enhancing both performance and reliability.Role OverviewWe are seeking experienced Staff+ iOS engineers with diverse backgrounds in the iOS platform. We value expertise in performance optimization, build/CI systems, or enhancing AI developer productivity. Whether your specialty lies in UI frameworks or automated testing, your contributions will lead to reduced friction, minimized complexity, fewer regressions, and improved overall performance.If you are passionate about scaling Swift development alongside advanced AI tools, we invite you to apply for this exciting role.This position is open in San Francisco, New York, and Seattle.Key ResponsibilitiesDevelop and enhance foundational Swift frameworks utilized across multiple applications and platforms (caching, state management, observability, navigation, and component systems).Boost application performance (startup speed, responsiveness, memory efficiency, battery life) through profiling, increased visibility, regression prevention, and architectural patterns.Enhance reliability by systematically reducing crashes, improving error handling, and driving improvements in the release process.Collaborate closely with product engineering teams to identify pain points and emerging infrastructure requirements.Create internal tools and automation (Bazel, CI, testing frameworks, Codex agent skills) to accelerate engineering velocity.Simplify complex real-world constraints into clean abstractions through intuitive APIs, enforceable contracts, and safe defaults.Ideal Candidate ProfileStrong fundamentals in iOS engineering (Swift, concurrency, networking, Xcode ecosystem, familiarity with UIKit/SwiftUI) and an understanding of contemporary features and best practices.A penchant for tackling platform challenges: frameworks, architecture, performance, and tools that empower and accelerate other engineers.Demonstrated ownership: proactively identifying risks and opportunities, driving projects to completion, and adapting quickly.A strong focus on measurement: able to instrument, define metrics, conduct experiments, and iterate based on data-driven insights.

Join Our Team as an iOS EngineerAt Speak, we are on a mission to transform language learning for everyone.Language learning can significantly enhance lives by connecting individuals to new cultures, career opportunities, and communities. With over two billion people globally striving to learn a language, the traditional approach of one-on-one tutoring remains challenging to access at scale and has seen little innovation in recent years. Speak aims to change this by developing a human-level, AI-driven tutor that fits in your pocket—a conversation-first platform that empowers learners to engage in dialogue, receive real-time feedback, and progress through meticulously crafted lessons. Our goal is to provide a complete journey from novice to confident speaker in multiple languages.Launched in South Korea in 2019, Speak has quickly established itself as the leading language learning app, now catering to learners across various markets and offering support for over 15 languages. As a premier AI company, we have secured over $150 million in venture funding from notable investors, including OpenAI, Accel, Founders Fund, and Khosla Ventures. Our diverse team is spread across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana.About the RoleAs a Mobile iOS Engineer on Speak’s engineering team, you'll play a pivotal role in enhancing our content delivery, conducting A/B testing on monetization features, and facilitating the launch of new markets and languages. You'll work closely with backend engineers, as well as our Product and Design partners, and be responsible for deploying product features to millions of users.Your ResponsibilitiesEnhance the “freemium” experience to boost user conversions.Assist in the launch of new markets and languages.Implement various paywall tests, including pricing strategies, design modifications, delayed paywalls, and special offers.Refine our speech-to-text capabilities.Enhance our audio and video streaming functionalities.Your Qualifications3+ years of experience in mobile engineering, ideally within a dynamic startup environment.Proficiency in Swift, with a solid grasp of mobile architectures such as MVC and MVVM.Bonus: Experience with SwiftUI and mobile streaming technologies.

About Quizlet:At Quizlet, we are dedicated to empowering every learner to reach their goals in the most effective and enjoyable manner. Our learning platform, valued at over $1 billion, supports millions of students each month, including two-thirds of U.S. high school students and half of U.S. college students, facilitating more than 2 billion learning interactions monthly.We combine cognitive science with advanced machine learning techniques to personalize and improve the educational experience for students, professionals, and lifelong learners. Our passion lies in maximizing learner engagement through diverse approaches and innovative tools.Let’s Innovate the Future of LearningJoin us in crafting and delivering AI-driven learning tools that transcend borders and unlock human potential.About the Team:The Mobile Study team at Quizlet, located in San Francisco, is dedicated to providing the optimal studying experience for millions of learners around the globe. Our team develops and enhances essential mobile features that make Quizlet a trusted learning ally—ranging from flashcards and practice modes to AI-enhanced study experiences. We work collaboratively with various teams within the mobile organization, backend services, design, and product teams to ensure seamless, high-quality learning experiences on both iOS and Android platforms.About the Role:We are in search of a Senior Software Engineer to become a vital member of our Mobile Study team at Quizlet. In this role, you will be instrumental in developing our iOS and Android applications, enhancing the study features that millions of students rely on to learn effectively with Quizlet. You will play a key role in shaping the core functionalities that keep learners engaged and thriving.You will collaborate closely with engineers, designers, and product managers to deliver high-quality mobile experiences. This position offers you the chance to influence technical direction, contribute to architectural decisions, and mentor fellow engineers while steering projects from concept to launch. We are seeking someone who is enthusiastic about crafting intuitive, high-performing, and dependable mobile experiences that truly make a difference for learners worldwide.We are pleased to inform you that this is an onsite position at our San Francisco office. To promote team collaboration, we require employees to be present in the office a minimum of three days per week: Monday, Wednesday, and Thursday, as needed by your manager or the company. We believe this environment fosters enhanced work efficiency, teamwork, and supports personal and organizational growth.

BitGo develops infrastructure for digital assets, offering solutions for custody, wallets, staking, trading, financing, and settlement. Since 2013, the company has supported institutions and retail investors worldwide, managing a significant portion of Bitcoin transactions and providing independent custody and staking services. BitGo operates globally and serves a broad client base, including exchanges and major brands. Role overview The Frontend & Mobile Software Engineer position is a full-time, onsite role based in San Francisco, California. This role emphasizes regular in-person collaboration to foster teamwork and drive innovation within the office. What you will do Develop and enhance cross-platform mobile applications for BitGo users. Use React or React Native to create a seamless and intuitive user experience. Support projects that power BitGo’s digital asset products and services. Requirements Proven experience with React or React Native. Interest in building mobile and frontend features that improve user experience. Ability to work onsite with the team in San Francisco. Learn more about BitGo at www.bitgo.com.

Join Inkitt as we revolutionize the entertainment industry! We are creating the Disney of the 21st Century by harnessing the power of AI and predictive algorithms to uncover hidden stories and transform them into blockbuster hits. With a new $1M ebook released every 4 weeks, we deliver directly to consumers through our innovative Galatea app. As the 11th most successful publisher globally, we have a hit-rate 40 times greater than traditional publishers. Backed by renowned VCs like Khosla, Kleiner Perkins, and NEA Ventures, our recent foray into CandyJarTV marks just the beginning of our journey to become a next-gen entertainment powerhouse.

Discord is a platform that connects over 200 million individuals monthly for a variety of activities, but one of the most popular uses remains to play video games. With more than 90% of our users engaging in gaming, they collectively spend 1.5 billion hours each month enjoying thousands of unique titles through Discord. As a pivotal player in the gaming landscape, we are dedicated to enhancing the social experience of gaming, making it seamless and enjoyable for users to connect before, during, and after gameplay.We are seeking a talented Senior Software Engineer to join our Mobile Architecture team, where you will be instrumental in creating the technical backbone that supports Discord’s mobile applications for millions of users around the globe.Your work will focus on performance-critical systems leveraging React Native, with the aim of providing an unparalleled mobile experience that feels immediate and responsive. Our aspiration is to develop products that captivate our users—functional, reliable, user-friendly, and delightful, with performance as a central element.

Discord connects more than 200 million users each month, offering a platform designed to enhance the gaming experience. With a community deeply engaged in gaming, over 90% of users play various titles, adding up to 1.5 billion hours of gameplay monthly, the company is dedicated to making it easy for players to interact and enjoy their gaming journeys. Role overview The Staff Software Engineer, Mobile Architecture will help define the technical direction for Discord’s mobile apps on iOS and Android. This role centers on optimizing performance-critical systems using React Native, aiming to deliver a seamless and responsive mobile experience. What you will do Shape the architecture and long-term vision for Discord's mobile platforms Lead technical strategy and address complex engineering challenges Mentor engineers within the mobile team Focus on improving functionality, reliability, and performance across mobile applications Requirements Experience with mobile development on iOS and Android Strong background in React Native Ability to guide technical decisions and mentor fellow engineers Proven track record of optimizing performance-critical systems

Join Known as a Founding Product EngineerLocation: San Francisco, CA (In-Person)Compensation: $150,000 - $200,000 + EquityAt Known, we're redefining how humans connect by utilizing advanced AI technology. Our mission is to enrich lives by fostering authentic connections, guided by the stories our users share.Our users engage deeply with our AI voice agent, averaging 27 minutes of conversation, allowing us to gather profound insights into their lives.Our engineering team consists of innovators who have previously developed some of the most popular AI-driven consumer products such as Uber, Uber Eats, Afterpay, and Cash App.We thrive in a collaborative in-person environment located in Cow Hollow, San Francisco, where hard work and autonomy are highly valued.About the RoleWe are in search of exceptional product engineers to further enhance the Known mobile application. Your role will involve a strong design focus as we aim to be the Apple of dating. Our engineers are meticulous artisans dedicated to quality, as we prioritize a product that is both intentional and distinctly human-centered.You may be a great fit if youHave a primary focus as a React Native engineerHave experience building products with intricate audio and voice functionalitiesAspire to create technology that facilitates a million marriagesExhibit a high level of attention to detailOur InvestorsWe are proudly backed by renowned investors including Eurie Kim and Kirsten Green from Forerunner Ventures (the minds behind Decagon, Faire, and Oura), as well as NFX and PearVC.

Join Our Innovative TeamAt OpenAI, we are on a mission to revolutionize mobile technology. Our team is responsible for developing a robust Kotlin-based platform that powers ChatGPT, Sora, and other rapidly advancing Android applications. Android is a crucial platform for ChatGPT, and we are dedicated to enabling teams to iterate swiftly while maintaining exceptional performance and reliability.About This PositionWe are seeking experienced Staff+ Android Engineers with diverse backgrounds in the Android ecosystem, particularly those specializing in performance optimization, continuous integration (CI), and enhancing AI developer productivity. Whether your expertise lies in UI frameworks, automated testing, or other areas, your contributions will lead to reduced friction, lower complexity, fewer regressions, and enhanced performance.If you are passionate about transforming Android development in the age of advanced AI tools, we want to hear from you.We are hiring in San Francisco, New York, and Seattle, with consideration for remote candidates.Your Responsibilities:Develop and enhance core Kotlin frameworks utilized across various applications and platforms (including caching, state management, observability, navigation, and component systems).Optimize application performance (startup time, responsiveness, memory usage, battery life) through profiling, monitoring, and architectural enhancements.Boost reliability by minimizing crashes, refining error handling, and improving the release process.Work closely with product engineering teams to understand and address pain points and emerging infrastructure requirements.Create internal tools and automation (CI, testing frameworks, Codex agent skills, etc.) to enhance engineering efficiency.Simplify real-world constraints into user-friendly abstractions: intuitive APIs, enforceable contracts, and safe defaults.You Will Excel If You:Possess strong expertise in Android development (Kotlin, modern architectural patterns, Jetpack).Thrive on tackling platform challenges: frameworks, architecture, performance, or developing tools that empower fellow engineers.Take initiative by identifying risks and opportunities, driving projects to completion, and adapting swiftly to changes.Value measurement: implement instrumentation, define metrics, conduct experiments, and iterate based on data.

Join General Medicine as a Mobile Engineer!At General Medicine, we are on a mission to revolutionize healthcare access. As a Mobile Engineer, you will play a pivotal role in developing and scaling our innovative healthcare store, simplifying the process of obtaining care. Our platform provides upfront pricing for virtual and in-person visits, prescriptions, labs, imaging, and more, making healthcare more transparent and accessible.Your Role:We are seeking a skilled Mobile Engineer to spearhead the creation of our inaugural native mobile application using React Native. This is a foundational position where you will take the lead in building the app from the ground up, making essential architectural decisions, and establishing frameworks that the rest of our team will utilize.Ideal Candidate:Our ideal candidate has a proven track record of shipping and maintaining React Native applications in a production environment. You should have a strong grasp of the distinctions between React Native and native iOS/Android development. Proficiency in Swift or Kotlin is essential for tasks such as HealthKit integrations, push notifications, or video calling SDKs. While your primary focus will be on TypeScript and React, you should also be open to contributing to our Next.js web frontend, as we view mobile and web as a unified experience.We value technical excellence and are looking for someone who can navigate the balance between speed and quality. Our engineers are proactive, versatile, and often engage in writing product requirements, analyzing SQL data for feature performance, and taking ownership of quality assurance. No task is too small if it contributes to delivering an exceptional product. If you thrive in ambiguous environments and are eager to collaborate closely with design, operations, and clinical teams, we want to hear from you!You don't need a healthcare background, but enthusiasm for tackling the complexities of the American healthcare system, including EHR integration and revenue cycle management, is a plus.