Engineering & Product Unsolicited Application (Berlin, hybrid)

theion

IHRE AUFGABEN Why Work With Us: Innovative Environment: Be part of a forward-thinking company at the forefront of battery technology.Growth Opportunities: Contribute to groundbreaking projects and advance your career in a rapidly evolving industry. IHR PROFIL We Are Looking For:We welcome initiative applications from individuals who are enthusiastic about battery technology and possess skills in the following areas: * Engineering: Electrical, Chemical, Mechanical, or related fields. * Research and Development: Battery chemistry, materials science, energy storage systems. * Product Development: Design, prototyping, testing, and optimization. * Project Management: Coordination, planning, and execution of battery-related projects. * Manufacturing and Operations: Process optimization, quality control, production management. * Sales and Marketing: Business development, market analysis, customer relations. Ideal Candidates Will Have: * Expertise: Proven experience in your field with a strong technical background. * Innovation: A creative and problem-solving mindset. * Collaboration: Excellent teamwork and communication skills. * Passion: A genuine interest in sustainable energy and battery technology. * Drive: Ambition and enthusiasm to contribute to our mission.

Sumup

Join SumUp's Mobile Platform Squad as an iOS Engineer and become part of the foundation that powers our iOS app. With significant investment in our mobile products, we are empowering feature teams to deliver world-class experiences. You will contribute to building the robust infrastructure that enables iOS engineers across the company to operate with productivity and efficiency, directly shaping the future of mobile payments for millions of merchants. Our engineering culture champions autonomy, collaboration, and innovation. Your work will have a meaningful impact, connecting you with mobile engineers across the organization. This role focuses on: * Improving Developer Experience: Building and maintaining tools and infrastructure that enhance the developer experience, reduce build times, and streamline workflows for our mobile engineering team. * Maintaining CI/CD Pipelines: Contributing to the reliability and efficiency of our CI/CD systems, helping feature teams ship with confidence. * Evolving a Mature Codebase: Participating in the improvement of our iOS codebase, focusing on simplicity, maintainability, and long-term health. * Supporting Product Stability: Providing foundational support across our iOS products, ensuring consistency and reliability for merchants worldwide. WHAT YOU'LL DO: * Develop and maintain internal tools, frameworks, and infrastructure that support the consistency and scalability of our iOS app. * Contribute to CI/CD systems and developer tooling initiatives to streamline mobile development processes. * Participate in tackling technical debt and improving code health in a complex, mature codebase. * Collaborate closely with mobile engineers across squads, providing support and sharing knowledge. * Take ownership of well-scoped platform initiatives from implementation through to delivery. WHAT WE'RE LOOKING FOR * 3+ years of professional iOS development experience, with solid knowledge of Swift and modern iOS frameworks. * Experience with or genuine interest in CI/CD pipelines (e.g., GitHub Actions, Fastlane) and developer tooling. * A good understanding of testing methodologies, architecture patterns, and design principles. * A pragmatic and flexible mindset - comfortable working outside the boundaries of a typical feature team. * The ability to navigate and improve complex, mature codebases with adaptability and curiosity. * Strong communication and collaboration skills, with comfort in frequent context switching. BONUS POINTS (NICE TO HAVE) * Experience with modularized codebases, internal tooling, or Ruby scripting. WHY YOU SHOULD JOIN SUMUP 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🌈 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 of €2000 for your individual development, which you can be used to attend conferences and/or advancing your career through further education 💶 A corporate pension scheme where we match up to 20% of your contributions 🏖️ Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days 🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team ABOUT SUMUP We believe in the everyday hero. Small business owners are at the heart of all we do, so we're creating tools that help them run their businesses. With a founder’s mentality and a 'team-first’ attitude, our diverse teams across Europe, South America and the United States work together to ensure that the small business owners we partner with can be successful doing what they love.  SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of 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. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind. SumUp will not accept unsolicited resumes from any source other than directly from a candidate 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.

Sumup

About the team: As an iOS Engineer on the Design System team, you'll translate SumUp's design language into a reusable, easy-to-use library of UI components and experience patterns — empowering product teams to build cohesive, accessible user experiences at scale. The Design System team works hand-in-hand with the Mobile Platform team to set standards and provide guidance across all product teams at SumUp. As we expand our ecosystem of merchant and consumer-facing products, this role offers a rare opportunity to shape the foundation that helps developers build faster and ship higher-quality experiences to millions of users worldwide.   What you’ll do: * Shape the core experience for both users and developers interacting with SumUp's iOS ecosystem * Collaborate closely with product and design teams to build components that are maintainable, consistent, and beautiful * Embed accessibility best practices into every component — from content descriptions and touch target sizing to color contrast and dynamic type * Provide hands-on technical guidance to product teams to deliver on company priorities, including the upcoming brand refresh * Review code contributions, enforce design system conventions, and mentor engineers on best practices for reusable UI development * Lead the migration of legacy UIKit-based components to SwiftUI while maintaining system stability * Proactively identify and address technical debt to uphold a high bar for engineering excellence and codebase health   You’ll be a great fit for this role if you: * Bring 3+ years of professional iOS development experience, ideally on large-scale or consumer-facing applications * Are fluent in Swift, with deep hands-on knowledge of both SwiftUI and UIKit — and a clear view on when and how to use each * Bring experience building or contributing to a design system, component library, or shared UI framework, and understand what it takes to make components truly reusable and scalable * Take pride in crafting accessible user experiences — you know your way around VoiceOver, dynamic type, color contrast, and touch target standards, and treat accessibility as a first-class concern, not an afterthought * Bring a strong grasp of testing best practices for UI components, including unit tests, snapshot tests, and UI automation * Are comfortable reviewing code and mentoring peers — you enjoy sharing knowledge, giving constructive feedback, and raising the bar for the whole team * Are self-motivated and structured in your working style — you manage your own priorities, communicate clearly in English, and thrive in a cross-functional, collaborative environment * Stay genuinely curious about the iOS ecosystem — you follow Apple's releases closely, experiment with new APIs, and are excited to bring fresh ideas back to the team Why you should join SumUp: 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🌈 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 of €2000 for your individual development, which you can be used to attend conferences and/or advancing your career through further education 💶 A corporate pension scheme where we match up to 20% of your contributions 🏖️ Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days 🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team   About SumUp We believe in the everyday hero. Small business owners are at the heart of all we do, so we're creating tools that help them run their businesses. With a founder’s mentality and a 'team-first’ attitude, our diverse teams across Europe, South America and the United States work together to ensure that the small business owners we partner with can be successful doing what they love.  SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of 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. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind. SumUp will not accept unsolicited resumes from any source other than directly from a candidate 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.