Meet Urban Sports Club

We are among the leading platforms for sports and wellness in Europe, dedicated to inspiring people to live active, healthy lives. With just one membership we offer access to thousands of fitness and wellness experiences across the continent.

But what truly sets us apart? We believe our people are at the heart of everything we do. If you’re curious about how we work, what we value and how you might grow with us, explore our Culture Hub & Career Opportunities.

*Big news: Wellhub and Urban Sports Club unite!*
Urban Sports Club is now a proud part of Wellhub, creating a global wellbeing ecosystem. Together, we connect 39,000 corporate clients and 97,000 wellness partners across 18 countries, offering millions of people even more ways to stay active and take care of their health.

The opportunity 

We are looking for a Staff Mobile Engineer with a passion for building great user experiences in an international environment. You will join our cross-functional teams working on our flagship application, developing innovative features and creating a smooth check-in experience for our members.

In this role, you will not only design and implement advanced Mobile applications in Kotlin and Swift, but also take architectural ownership, help guide native development, and ensure alignment between Android and iOS. Working closely with engineers, product managers, and designers, you’ll bring cohesion across platforms and set the direction for mobile excellence at Urban Sports Club.

What you will do

• Design and build advanced applications in Swift for the iOS platform, experience in Android is a plus.
• Collaborate with cross-functional teams to define, design, and deploy new features.
• Write unit tests and ensure robustness across edge cases, usability, and reliability.
• Work on bug fixing and improving application performance.
• Continuously discover, evaluate, and implement new technologies to maximize development efficiency.
• Drive architectural decisions and help coordinate efforts across Android and iOS for consistent implementations.

What you will need to succeed

• You have a degree in Computer Science or equivalent experience and at least 8 years of professional Mobile (iOS or Android) development.
• With strong expertise in Swift, you’ve gained hands-on experience across different iOS versions and screen sizes.
• Skilled in designing SwiftUI, you apply established design principles, patterns, and best practices in your work.
• Experience with RESTful APIs, offline storage, maps APIs, and performance tuning enables you to build apps that are both scalable and reliable.
• Familiarity with cloud messaging APIs, push notifications, CI/CD practices, and effective use of open-source libraries supports your efficiency.
• The ability to translate business requirements into technical solutions and to communicate clearly across teams ensures alignment and impact.

What’s in it for you 

• Work on cutting-edge tech and influence the future of our stack: explore our Tech Radar
• Free Urban Sports Club L Pro Membership + Friends and Family Discount: Stay active with free membership, plus discounts for friends and family.
• Flexible Work Model: Enjoy a hybrid work setup, balancing on-site and remote work options to fit your lifestyle.
• Extended Remote Work Options: Work up to 120 days remotely within the EU, the UK, and Switzerland, including 30 days outside the EU. You’ll also have the option to desk-swap at our other European offices.
• WorkOUT Life Balance: Take advantage of 30 days of paid vacation annually, plus two additional days for volunteering, flexible working hours, and complimentary access to our mental health provider Open Up.
• Personal Development: Receive an annual budget of €1,000 for professional growth, with regular internal training sessions and weekly German and English language classes.
• Engaging Team Culture: Participate in regular team and company events along with wellness initiatives that help you stay productive, healthy, and engaged in a hybrid work environment.

Urban Sports Club is committed to providing a friendly, safe, and welcoming environment for everyone who applies for a position or already works with us, regardless of their sports preferences, gender, gender identity and expression, sexual orientation, disability, physical appearance, body size, race, age, or religion (or lack thereof).

Wallapop is a Barcelona based scale-up driven by the purpose to empower people to embrace a more conscious and human way of consumption. We believe in a world where collaborative economy is mainstream. This is what drives us. 💫

Wallapop operates in Spain, Italy and Portugal, offering a catalogue of several hundreds of millions of products and services. Powered by technical innovation and continuous improvement, we bring together the scale & trust of classifieds with the marketplace’s convenience & reach. 🌱 Our mission is to enable a connected trade ecosystem, making 2nd-hand the norm through smart use of technology.

The Challenge 🧩

Working on a 10+ year-old codebase used by millions, you will join a cross-functional team dedicated to creating impactful user experiences. Our core technology stack includes:

• Our own simplified, TCA-inspired architecture using RxSwift

• Custom dependency injection system

• Extensive testing infrastructure, including snapshot-based integration tests

• Modern UIKit and SwiftUI

• Performance monitoring and analytics tools

• Realm and CoreData

• Quick and Nimble

• Snapshot Testing

• Bazel-based build system

What You Will Do 👇

• Design and implement new features in alignment with our architectural guidelines.

• Collaborate with product and design teams to deliver high-quality user experiences.

• Write clean, maintainable, and testable code.

• Engage in code reviews and technical discussions to elevate team standards.

• Continuously improve our testing practices and overall code quality.

• Contribute to the evolution of our iOS architecture and development practices.

• Drive technical decisions that directly impact your team's feature development.

What We’re Looking For 🔎

• Strong experience with Swift and modern iOS development.

• A proven track record of writing clean, scalable, and maintainable code.

• Experience working in large, modular codebases within cross-functional agile teams.

• A strong product mindset with a passion for delivering excellent user experiences.

What Would Be A Plus 🚀 

• Experience with UI/UX polish, custom animations, and iOS accessibility standards.

• Solid understanding of reactive programming (RxSwift or Combine).

• Experience working on large-scale, high-traffic consumer applications.

• Familiarity with agentic engineering and AI coding assistants (e.g., Claude Code, GitHub Copilot).

Do note that all our jobs are 📍 Barcelona based. We follow a hybrid model where flexibility rules. We commit to a minimum of 6 days per month in the office. Each team self-organizes to decide on cadence and in-person/remote rituals.

Wallapop is an equal-opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees as we want Wallapop to be a place for everyone.

We sponsor visa processes for international candidates when applicable and provide legal & admin support along the process combined with a competitive relocation package.

Additionally to the opportunity to contribute to an agile product set up and work together towards achieving our meaningful mission, we offer the following 🍭 Perks & Benefits:

• Generous individual learning budget of 2k per year
• Free office meals, lunch selection from different providers
• Group and individual English, Catalan & Spanish lessons as part of our working day
• Private Health Insurance with Alan
• Flexible working hours + intensive Fridays
• Flexible remuneration to deduct from gross salary (kindergarten/food/transport check)
• Gym & Wellness plan, including physiotherapist in the office
• Generous referral Program & Charity Donation
• Bonus for weddings & newborns
• Wallapop Renta (Tax income support)
• Monthly plan for free shipping, bumps & home-pick-up on our services
• Work anniversary Gifts and Birthday Surprises
• Contribution towards your WIFI in your monthly payroll
• One-off payment based on compensation package to go towards setting up your home office
• Relocation package (monetary support and legal advice) and visa sponsorship, if applicable
• 26 holidays per year
• TOP hardware of your choice (latest Apple or Windows)

What does the hiring process for this position look like? 👀 **Please, note that all interviews take place remotely over hangouts.**

• Intro Call - run by Talent Acquisition, focus on providing more information about the role and the company as well as going over your experience, motivation, and expectations. This usually takes 45-60 minutes.
• Technical Task - you will be assigned a test that consists of a coding challenge to assess the technical skills required for the role. You will have up to 7 days to complete it. If you have a recent project that meets the same requirements, you can submit it instead.
• Expertise Interview - run by the core team, focusing on the hard skills and the ability to deliver in a given context. This usually takes 60-90 minutes.
• Stakeholder Interview - run by the hiring team and relevant stakeholders, focus on the ability to collaborate & deliver in a cross-functional set-up. This usually takes 60 minutes.
• Culture Interview - run by culture interviewers, focus on adherence to Wallapop's purpose and business proposition. This usually takes 60 minutes.
• Offer - should you be the right candidate, your offer will be discussed over a call with talent acquisition and will then be confirmed in writing.

The mission of Speechify is to make sure that reading is never a barrier to learning.

Over 50 million people use Speechify’s text-to-speech products to turn whatever they’re reading – PDFs, books, Google Docs, news articles, websites – into audio, so they can read faster, read more, and remember more. Speechify’s text-to-speech reading products include its iOS app, Android App, Mac App, Chrome Extension, and Web App. Google recently named Speechify the Chrome Extension of the Year and Apple named Speechify its App of the Day.

Today, nearly 200 people around the globe work on Speechify in a 100% distributed setting – Speechify has no office. These include frontend and backend engineers, AI research scientists, and others from Amazon, Microsoft, and Google, leading PhD programs like Stanford, high growth startups like Stripe, Vercel, Bolt, and many founders of their own companies.

Overview

With the growth of our iOS app, being the #18 productivity app in the App Store category and also our recent recognition as Apple's 2025 Design Award for inclusivity, we find the need for a Senior iOS Engineer to help us support the new user base as well as work on new and exciting projects to push our missing forward.   

This is a key role and ideal for someone who thinks strategically, enjoys fast-paced environments, passionate about making product decisions, and has experience building great user experiences that delight users.

We are a flat organization that allows anyone to become a leader by showing excellent technical skills and delivering results consistently and fast. Work ethic, solid communication skills, and obsession with winning are paramount. 

Our interview process involves several technical interviews and we aim to complete them within 1 week. 

What You’ll Do

• Opportunity to lead key engineering and product decisions
• Actively shipping production code for the Speechify iOS app
• Work within a dedicated product team
• Participate in product discussions to shape the product roadmap
• Maintain and enhance the existing complex app architecture

An Ideal Candidate Should Have

• Experience. You've worked on products that scaled to a large user base
• Track record. You have worked on various products from inception to decent traction. You have been responsible for engineering the product
• Customer obsession. We expect every team member whose responsibilities directly impact customers to be constantly obsessed about providing the best possible experience
• Product thinking. You make thoughtful decisions about the evolution of your product and support internal teams and designers into taking the right direction
• Speed. You work quickly to generate ideas and know how to decide which things can ship now and what things need time
• Focus. We’re a high-growth startup with a busy, remote team. You know how and when to engage or be heads down
• Technical skills. Swift, SwiftUI

Technical Requirements:

• Swift Programming Language
• SwiftUI experience
• Experience in Multithreading Programming
• Working with CI/CD infrastructure
• Experience with Fastlane
• SOLID principles, the ability to write every single class according to SOLID
• Experience with Git and understanding of different Git strategies

What We offer:

• A fast-growing environment where you can help shape the company and product
• An entrepreneurial crew that supports risk, intuition, and hustle
• The opportunity to make a big impact in a transformative industry
• A competitive salary, a collegiate atmosphere, and a commitment to building a great asynchronous culture
• Work on a product that millions of people use and where daily feedback includes users sharing that they cried when they first found the product because it was so impactful on their lives
• Support people with learning differences like Dyslexia, ADD, Low Vision, Concussions, Autism, and Second Language Learners, and give reading superpowers to professionals all over the world
• Work in one of the fastest growing sectors of tech: Intersection of Artificial Intelligence and Audio

Think you’re a good fit for this job? 

Tell us more about yourself and why you're interested in the role when you apply.
And don’t forget to include links to your portfolio and LinkedIn.

Not looking but know someone who would make a great fit? 

Refer them! 

Speechify is committed to a diverse and inclusive workplace.

Speechify does not discriminate on the basis of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or other legally protected status.

Your Mission

Shape and evolve the native iOS onboarding and verification experience; the critical gateway every user must pass through before accessing the platform.You will not only build features, but also help define how complex regulatory, identity, and compliance requirements are translated into fast, reliable, and intuitive user journeys. Your work directly impacts user activation, trust, and conversion across multiple regulated markets.

The Onboarding & Verification team owns the full entry lifecycle into Bitpanda: registration and account creation, personal data capture, AML questionnaires, identity verification flows with multiple providers, backend-driven onboarding orchestration, KYC refresh processes, and regulatory requirements. You will help ensure this entire system is scalable, resilient, and seamless across all edge cases and jurisdictions.

What you'll do

• Design, develop, and maintain advanced onboarding and verification flows on iOS, working closely with product, design, backend, and compliance teams to deliver frictionless yet fully compliant user journeys.
• Architect and implement robust, multi-step onboarding experiences including registration, identity verification, AML flows, and dynamically orchestrated onboarding steps driven by backend systems.
• Integrate and maintain multiple identity verification providers (e.g. Sumsub, Onfido, Fourthline, SPID, Solaris, IDnow), ensuring reliability, consistency, and graceful handling of edge cases and failure scenarios.
• Take ownership of critical areas of the onboarding experience; driving improvements in conversion, reducing drop-off, improving performance, and ensuring long-term maintainability and scalability of the app.

Who you are

• You understand that onboarding is a high-stakes system where user experience, regulation, and conversion are tightly coupled.
• You are highly proficient in Swift and deeply experienced with iOS architecture, UIKit, SwiftUI, and building scalable, production-grade mobile systems.
• You have strong experience designing and shipping complex, multi-step user flows and integrating third-party SDKs or external service providers in mobile applications.
• You think in systems, not screens; you care about orchestration, state management, edge cases, and long-term maintainability of complex flows.
• You take senior-level ownership: you proactively identify friction, simplify complexity, improve architecture, and raise the technical and product bar of the team.

Your Mission

You’ll build and evolve a high-performance native app used by millions to invest in crypto and traditional assets. You won’t just ship features; you’ll shape how people experience trading in real time, owning everything from architecture decisions to polished UI interactions across the full app lifecycle.

You’ll be part of the Trading Experience team, responsible for the core of Bitpanda’s product: the end-to-end interface where users buy, sell, and manage their investments. From real-time trading flows to advanced features like Take Profit/Stop Loss, Margin Trading, and automated Savings Plans; you’ll craft fast, intuitive, and reliable experiences that make complex financial actions feel effortless.

What you'll do

• Build and ship high-impact iOS features end-to-end, collaborating closely with product, design, and backend teams to deliver seamless, real-time trading experiences.
• Write clean, scalable, and well-tested code, raising the bar for quality and reliability across the codebase.
• Take full ownership of your domain; debugging issues, optimising performance, and continuously improving the responsiveness and stability of the app.
• Stay ahead of the curve with iOS advancements, bringing in modern tools, frameworks, and best practices to keep the app fast, elegant, and future-proof.

Who you are

• You’re genuinely excited about mobile development and obsessed with turning complex systems into smooth, intuitive user experiences.
• You’re highly proficient in Swift and deeply familiar with iOS development best practices, architecture patterns, UIKit, and SwiftUI.
• You have hands-on experience building and scaling production-grade apps, with a strong focus on performance, quality, and maintainability.
• You have a strong eye for UI/UX and care about the details that make an app feel fast, fluid, and delightful.
• You take ownership; pushing ideas forward, improving things proactively, and raising standards beyond what’s asked.

Your Mission

Design and build the critical entry point into our product; the onboarding and verification experience that every user must pass through before they can invest. You’ll work on the native iOS app, crafting seamless, high-trust user journeys that transform complex regulatory, compliance, and identity verification requirements into fast, intuitive flows. From sign-up to full account activation, you’ll help ensure users can join Bitpanda safely and effortlessly across multiple markets and regulatory regimes.

Our Onboarding & Verification team owns the entire lifecycle of user entry into the platform: account creation, personal data collection, AML checks, identity verification integrations, orchestration of onboarding steps, ongoing KYC refreshes, and regulatory flows. This is one of the most critical systems in the company; directly shaping conversion, trust, and compliance at scale.

What you'll do

• Design, develop, and maintain high-impact onboarding and verification features on iOS, collaborating closely with product, design, backend, and compliance teams to deliver smooth and compliant user journeys.
• Build and evolve complex flows such as registration, identity verification, AML questionnaires, and step-based onboarding orchestration, ensuring they feel simple and fast for users.
• Integrate and work with multiple identity verification providers (e.g. Sumsub, Onfido, Fourthline, SPID, Solaris, IDnow), handling edge cases, reliability, and fallback flows.
• Own your part of the onboarding experience end-to-end; improving conversion, reducing friction, and continuously refining performance, stability, and usability across all onboarding steps.

Who you are

• You care deeply about first impressions and understand that onboarding is where trust, compliance, and conversion all collide.
• You’re highly proficient in Swift with strong knowledge of iOS architecture, UIKit, SwiftUI, and building robust, production-grade applications.
• You have experience working with complex, multi-step flows and/or third-party SDK integrations in mobile apps.
• You think beyond screens; you care about systems, orchestration, edge cases, and how backend-driven flows translate into great user experiences.
• You take ownership seriously: you proactively simplify complexity, improve conversion flows, and raise the quality bar across everything you touch.

With our growing customer base and our expansion into new markets and use cases, we have more to build than ever at Affinity as we execute on our vision to put relationship intelligence at every professional's fingertips.

We're building a world-class dual-native mobile experience for our CRM platform. Our iOS app is used daily by dealmakers, investors, and professionals who rely on Affinity to manage millions of dollars in relationships and deals. We need an open-minded iOS expert to own and evolve our SwiftUI-based mobile application.

This is a unique opportunity to join a small, high-impact mobile team where you'll have significant ownership over the iOS codebase and architecture. As we expand our mobile presence, you'll also have the opportunity to contribute to our dual-native strategy, including Kotlin Multiplatform shared code and Jetpack Compose Android development.

Location: Barcelona, Spain

For this role, we're embracing a hub-hybrid model, designed to balance flexibility with meaningful in-person collaboration. Team members are expected in-office 2-days per week. We believe great things happen when people come together intentionally to connect, create, and build momentum as a team.

In this role, you will:

• Own the iOS codebase: Lead architecture decisions, maintain code quality, and drive technical excellence for our SwiftUI application
• Develop core platform functionality: Build new features while ensuring a seamless, high-performance experience for users across mobile interfaces
• Contribute to shared infrastructure: Help build and maintain our Kotlin Multiplatform (KMP) shared module for business logic, networking, and data models
• Ensure quality and performance: Write comprehensive tests, optimize for 60fps scrolling, manage memory efficiently, and maintain App Store quality standards
• Collaborate cross-functionally: Work closely with product, design, and backend teams to deliver cohesive features that delight users
• Support cross-platform development: Participate in Android development efforts, leveraging similarities between SwiftUI and Jetpack Compose

Qualifications:

Don’t meet every single requirement? Studies have shown that women and people of color are less likely to apply to jobs unless they meet every qualification. At Affinity, we are dedicated to building a diverse, inclusive, and authentic workplace, so if you’re excited about this role, but your past experience doesn’t perfectly align with the qualifications above, we encourage you to apply anyways. You may be just the right candidate for this or other roles.

• 5+ years of iOS development experience, with deep expertise in modern iOS development
• Expert-level SwiftUI skills: You have a strong understanding of SwiftUI architecture patterns, state management, MVVM, dependency injection, and compositional design.
• Swift 6 proficiency: You have a deep knowledge of modern Swift, including async/await.
• Shipped apps: You have a proven track record of shipping high-quality apps to the App Store.
• Networking and APIs: You have a strong understanding of REST APIs, JSON serialization, authentication, and error handling.
• Troubleshooting: You’re comfortable troubleshooting across network and application layers. You know how to diagnose and improve performance issues systematically.
• Communication: You communicate nuanced ideas clearly, whether you're explaining technical decisions in writing or brainstorming in real time. You can effectively contribute to technical strategy and roadmaps on product-oriented teams.
• Ownership: You demonstrate strong ownership instincts and sweat the details. You have strong convictions, weakly held, and assume validation and iteration are a given to produce the best results.
• Growth mindset: Interest in expanding beyond iOS to become a T-shaped mobile engineer.

Nice to have:

• Android experience or a strong desire to learn Kotlin Multiplatform knowledge
• AI-Driven Engineering
• UIKit knowledge
• Experience writing unit tests and UI tests.
• Experience building B2B or CRM applications

Tech stack:

Mobile
  - iOS: SwiftUI, Swift 6, UIKit (for bridges), Xcode, Swift Package Manager
  - Android: Jetpack Compose, Kotlin (you'll have opportunities to learn)
  - Shared: Kotlin Multiplatform (for business logic and networking)
  - CI/CD: Fastlane, CircleCI, GitHub Actions

Backend & Infrastructure
  - Backend: Ruby on Rails, PostgreSQL
  - APIs: REST, JSON, GraphQL
  - Infrastructure: AWS, Kubernetes

How We Work:

Our culture is a key part of how we operate as well as our hiring process:

• Small, high-impact team: You'll be one of two mobile engineers, with significant ownership and influence
• T-shaped philosophy: We value deep expertise in one platform plus breadth across mobile development
• Dual-native approach: We build native iOS and Android apps that share business logic via Kotlin Multiplatform
• Strategic Delivery: Analyze business requirements to balance high-quality engineering with speed to market, making informed technical trade-offs to deliver value efficiently without compromising system integrity.
• Collaborative culture: Regular pair programming, thorough code reviews, and cross-functional collaboration

If you’d want to learn more about our values click here.

What you'll enjoy at Affinity:

• We live our values: As owners, we take pride in everything we do. We embrace a growth mindset, engage in respectful candor, act as playmakers, and "taste the soup" by diving deep into experiences to create the best outcomes for our colleagues and clients.
• Health Benefits: Comprehensive health insurance for both you and your family.
• Learning & Development: We provide an annual education budget and a comprehensive L&D program.
• Wellness Support:  We provide a monthly budget for wellness memberships/equipment to support your overall health and happiness.