Senior iOS Developer - 6 Month FTC

Sumup

ABOUT THE ROLE At SumUp, we're on a mission to bring merchants and consumers closer together and help local communities thrive. With SumUp Consumer, we're building a rewarding banking experience that connects people to the small businesses they love while enabling free transactions for our merchants. SumUp Consumer helps consumers manage their money with ease and get more from everyday spending. It offers seamless payment experiences and financial tools designed for modern life—spanning banking, cards, savings, and open banking. This is a high-impact, hands-on engineering role where you'll own the development and quality of the SumUp Consumer iOS application. You'll work directly on the features that consumers interact with every day, collaborating closely with Backend Engineers, Product Managers, Designers, and Android Engineers to deliver polished, reliable, and impactful mobile experiences. WHAT YOU’LL DO * Build and ship features across key consumer banking product areas—including KYC flows, card management, savings, open banking consent, and payment experiences. * Write clean, testable Swift code and participate actively in code reviews to uphold high engineering standards across the codebase. * Contribute to and evolve the iOS app architecture, including modularisation, dependency management, and scalability patterns as the product grows. * Own performance and reliability by monitoring crash rates, proactively identifying issues, and driving app stability before they impact consumers. * Maintain a culture of quality by writing unit and UI tests and contributing to the health of our CI/CD pipelines. * Collaborate cross-functionally with Backend Engineers on API design, Product Managers on roadmap priorities, and Designers on seamless user experiences. WHAT MAKES YOU GREAT FOR THIS POSITION * Strong proficiency in Swift and deep knowledge of the iOS framework (Objective-C knowledge is a plus). * Solid understanding of RESTful API integration and experience working with backend engineers on API design. * Experience working with agile methodologies, CI/CD pipelines, and pair programming. * Deep care for user interaction, usability, and interface quality—you build things that feel great to use. * Ability to understand a large problem, design a solution, break it into deliverable chunks, and ship it independently. * Passion for clean, maintainable, and testable code and a genuine pride in your craft. * Mature, business-minded approach—balancing high-quality engineering with pragmatism in a fast-paced environment. * Self-driven and proactive nature, comfortable owning a domain with limited direct oversight. * Previous experience in payments, financial services, or fintech environments is a strong plus. WHY YOU SHOULD JOIN SUMUP 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide. 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced. 🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp’s future success. 📚 A dedicated annual L&D budget for your individual development, which can be used to attend conferences and/or advancing your career through further education. 💶 Competitive Health & Life Insurance: Includes comprehensive cover (optical, dental) and Life Assurance (2 x your salary). 💰 Financial Future: A corporate pension scheme and a referral bonus for bringing in top talent. 🏖️ Generous time off: 28 days of paid leave plus public holidays and special leave days. 🌴 Break4me: 1-month paid sabbatical after 3 years of service. 🎉 Culture of Connection: Attend global offsites and/or hackathons with your teammates.   ABOUT SUMUP Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing a vast set of simple and affordable business tools to help them start, run, and grow their businesses. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster an inclusivity and continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

DEPT

DEPT® is a Growth Invention company built to help the world’s most ambitious brands grow faster. Operating at the intersection of technology and marketing, our 4,000+ specialists deliver growth invention services across Brand & Media, Experience, Commerce, CRM, and Technology & Data. We’re 50|50 tech and marketing, partner-led, and first to move. Clients include Google, Lufthansa, Meta, eBay, and OpenAI. We have been certified B Corp and Climate Neutral since 2021. JOB PURPOSE This is an embedded role working directly within the marketing team of a leading consumer mobile app brand, based at their offices in Canary Wharf. We are open to either a 6 month fixed-term contract, or freelance engagement, for 2–3 days per week, with the potential to extend. As an ASO Specialist, you will lead and optimise the app store presence across both iOS and Android platforms, helping drive organic visibility, conversion, and app growth. You will work closely with internal marketing, creative, analytics, product, and performance teams, as well as external app growth partners, to deliver a best-in-class app store optimisation strategy. This role requires a strong understanding of ASO fundamentals, mobile growth marketing, and app store performance mechanics. The ideal candidate combines analytical thinking with creative optimisation skills and is comfortable managing multiple workstreams, experiments, reporting cycles, and stakeholder conversations simultaneously. You will be responsible for improving app discoverability and conversion through ongoing optimisation of app store listings, creative assets, keyword strategies, testing roadmaps, and performance insights. You will also play a key role in identifying growth opportunities and translating data into actionable recommendations that improve overall app performance. WHAT YOU’LL DO: * Lead the day-to-day ASO strategy and optimisation across the Apple App Store and Google Play Store. * Own and optimise app store listings, including titles, subtitles, descriptions, keyword fields, screenshots, icons, preview videos, promotional content, and in-app events. * Develop and manage a structured ASO testing roadmap, including metadata experiments, creative testing, keyword optimisation, and competitor analysis. * Monitor and improve app store performance metrics including impressions, product page views, conversion rate, installs, rankings, ratings, reviews, and organic growth. * Collaborate closely with analytics, product, creative, CRM, and performance marketing teams to turn insights into clear optimisation actions. * Work alongside external ASO agencies or app growth partners, helping prioritise activity, review deliverables, and ensure high quality execution. * Support the alignment between paid app store activity and organic ASO performance, including collaboration around Apple Search Ads. * Provide regular reporting, analysis, and recommendations to internal and external stakeholders. * Identify opportunities to improve app visibility, conversion, and downstream performance through continuous optimisation and experimentation. * Present ASO insights, performance updates, and strategic recommendations clearly to both technical and non-technical stakeholders. WHAT YOU BRING: * Proven experience in ASO, app growth, mobile marketing, or performance marketing, ideally within a consumer mobile app environment across both iOS and Android. * Strong understanding of App Store and Google Play ranking factors, including keyword optimisation, metadata, category rankings, ratings and reviews, and conversion optimisation. * Hands-on experience managing and optimising app store listings and creative assets. * Experience developing and managing ASO testing roadmaps and experimentation frameworks. * Knowledge of Apple Search Ads and the relationship between paid and organic app store performance. * Experience working with or managing ASO agencies or external app growth partners. * Strong analytical mindset with the ability to interpret performance data and translate findings into actionable recommendations. * Comfortable collaborating cross-functionally with analytics, creative, product, CRM, and marketing teams. * Excellent stakeholder management and communication skills. * Highly organised, proactive, and able to manage multiple priorities in a fast-paced environment. Nice-to-have: - Experience with ASO platforms such as AppTweak, Sensor Tower, data.ai, AppFollow, MobileAction, or similar. - Experience using analytics and reporting tools such as Looker, GA4, Firebase, Amplitude, AppsFlyer, Adjust, Tableau, or Google Sheets. WE OFFER * A flexible, hybrid working policy * The choice of medical healthcare providers (Bupa or Medicash)  * 25 days holiday plus bank holidays and your birthday off each year * Company pension scheme  * EAP scheme * Ride to work scheme  * Enhanced family-friendly policies * Buddy Program: You will be paired with a ‘Buddy’ to help you through your first weeks’ at DEPT®. * A reputation for doing good. DEPT® has been a Certified B Corp® since 2021 and named ‘Agency of the Year’ at both The Lovies and The Webby Awards. * Awesome clients. Whether big or small, local or global — at DEPT® you’ll get the opportunity to work with clients of all sizes and across all industries. And we celebrate all of our successes together! * The opportunity for possibility. We want to enable you to do what you do best and help you develop your skills further with training, development and certifications. * Global annual DEPT® Cares Month in which employees come together and donate their skills to support local charities. WHY DEPT®? We are a Growth Invention company built to help the world’s most ambitious brands grow faster. Operating at the intersection of technology and marketing, we create what is next by pioneering ideas, acting fast, and moving further because standing still just is not in our DNA. We are drawn to people who stay curious, move with intent, and never stop inventing. Our culture runs on three values: better together, relentlessly curious, and get sh*t done. It is how we work, how we grow, and how we make things that matter. At DEPT®, you will find the freedom to explore, the space to collaborate, and the trust to make a real impact for our clients, for each other, and for the world we are helping to build. DIVERSITY, EQUITY & INCLUSION At DEPT®, we take pride in creating an inclusive workplace where everyone has an equal opportunity to thrive. We actively seek to recruit, develop, nurture, and retain talented individuals from diverse backgrounds, with varying skills and perspectives. Not sure you meet all qualifications? Apply, and let us decide! Research shows that women and members of underrepresented groups tend not to apply for jobs when they think they may not meet every requirement, when in fact they do. We believe in giving everyone a fair chance to shine. We also encourage you to reach out to us and discuss any reasonable adjustments we can make to support you throughout the recruitment process and your time with us. Want to know more about our dedication to diversity, equity, and inclusion? Check out our efforts here.

Runna

We're putting together a talented team to build the #1 training platform for Runners We help everyday runners become outstanding by building an incredible app providing world-class training, coaching and community for everyone, whether you're improving your 5k time or training for your first marathon. We’re growing extremely fast! In November 2023 we closed a $6.5M funding round led by JamJar with participation from Eka Ventures, Venrex and Creator Ventures. In 2024, we were selected by Apple as one of three global finalists for the iPhone app of the year, reflecting the innovation and impact of what we’ve built & in 2025 we were acquired by Strava! Our ambition is huge: to become the go-to global leading training platform for millions of runners everywhere. We’re growing with purpose and looking for people who want to build something meaningful with lasting impact. With the recent acquisition by Strava accelerating our journey, now is a really magical time to join. 🚀 ABOUT THE CONTRACT ROLE We are looking for talented, creative and positive team players for our highly-skilled cross-functional engineering group on a contract basis. This role will collaborate closely with our modelling teams to integrate features that are core to Runna’s mission (think adapting plans around holidays and B races, supporting new cutting edge plans, and building in-app experiences around our AI/ML tooling). This will be a 6-month contract role. WHAT YOU’LL BE DOING * Architecting, building, testing and delivering new features across the full stack * Working with the Product team to identify the most suitable solution for the best customer experience * Collaborating with modelling/AI engineers to design architecture used to interface between the Runna training engine and Runna app * Always be on hand to help when help is needed on technical matters * Coaching and supporting engineers, providing guidance, mentorship, and code reviews without creating bottlenecks. * Contribute to us operate more efficiently, by building and maintaining our developer tooling and CI/CD pipeline * We rotate the responsibility of releases across engineers, so you will get the opportunity to lead the process and deploy changes to production * Impacting engineering by championing new technologies and setting standards for engineering quality WHAT YOU’LL BRING TO THE TEAM: * Very proficient in TypeScript/JavaScript development * Able to work in a highly skilled engineering team in a fast-paced, iterative environment. In 2024 we shipped: * 99 mobile app releases (iOS and Android) * 443 API releases * 237 modelling backend releases * 4+ years experience in your main expertise area (Frontend, Backend etc) * Comfortable picking up new things and working on technologies outside your comfort zone * Are skilled in delivering features end-to-end, from architecture design and building through to releasing, testing and supporting * Enthusiasm for our ways of working which include: * Iterative development, continuous deployment and test automation * Knowledge sharing, pair programming, collaborative design & development * Shared code ownership & cross-functional teams * Have experience with React Native (worked on large scale applications) * Have experience with AWS * Are experienced in delivering features full-stack BONUS POINTS IF YOU HAVE: * Are experienced in SwiftUI * Are experienced in deployment, releasing cycles or CI/CD * Have experience with Serverless architectures * Experience with Terraform or other IaC tooling (e.g. CDK, CloudFormation, etc.) * Have experience in open source contributions, including reporting bugs/issues in GitHub, testing new releases, or contributing to code OUR TECH STACK Below you can find a small reflection of our current tech stack: Frontend: * React Native (iOS and Android) * Typescript * GraphQL (Apollo Client) * Fastlane * SwiftUI (Apple Watch) * Maestro E2E tests Backend: * Serverless (AWS) * Lambdas (NodeJS & Python) * AWS AppSync * DynamoDB, S3, SQS, SNS, EventBridge, SageMaker * Snowflake All the other good stuff: * Sentry * GitHub Actions * Intercom, Mixpanel * RevenueCat * App Store Connect / Play Store * Google Tag Manager OUR INTERVIEW PROCESS: Our aim is to keep the interview process as straightforward and enjoyable as possible, and will consist of the following stages: 1. Screening call with Talent team (30 minute video call) 2. Getting to Know You + Live Coding (45-minute video call, first 25 mins will be an introductory chat followed by two live coding exercises from https://leetcode.com/) 3. 1.5-hour technical interview (the first half of the call will be used to discuss the take-home technical task from the previous stage and the second half will consist of system design and some general architecture/tech questions) Please let us know if there’s anything we can do to better accommodate you throughout the interview process - this can be from scheduling interviews around childcare commitments to accessibility requirements. We want you to show your best self in the process, so please speak to your Talent Partner