Senior Mobile Software Engineer (iOS) - Consumer Experience

Main Responsibilities

As a Senior Mobile Software Engineer, you will be a key contributor to shaping a new shopping experience for customers and improving mobile applications. You will work closely with product managers, designers, and other engineers to translate user needs into robust, high-performance mobile experiences. This role is suited to someone with solid mobile development experience, strong software engineering principles, and a desire to grow in a fast-paced e-commerce environment. Engineers who enjoy staying versatile and occasionally exploring technology beyond their core iOS focus are welcome.

Important things for you

• Flexible working hours in a 4/1 hybrid model, with start times between 7:00 a.m. and 10:00 a.m.
• 30 days of occasional remote work.
• Salary range, depending on skill set, on a contract of employment with tax-deductible costs: PLN 18,850–25,900.
• Annual bonus based on annual performance and company results.
• Team based in Poznań and Kraków.

What You'll Do

• Design, develop, test, and deploy features for the iOS application, ensuring high quality, performance, and responsiveness.
• Collaborate with product, design, and cross-functional engineering teams to define and implement innovative mobile solutions.
• Participate in code reviews, contribute to architectural discussions, and maintain high code-quality standards across the iOS platform.
• Join a mobile community of more than 100 developers that shares knowledge through daily code reviews, internal tech talks, and dedicated time for personal skill development.
• Identify and resolve performance bottlenecks, memory leaks, and scalability issues within the iOS app.
• Stay current with iOS technologies, including Swift, SwiftUI, and Apple SDKs, as well as mobile industry trends.

We are looking for someone who has

• Fluency in Swift and the iOS SDK.
• Solid knowledge of SwiftUI, Combine, and Swift Concurrency.
• Ability to write unit tests using XCTest and Swift Testing, snapshot tests using SnapshotTesting, and UI tests using XCUITest.
• Experience collaborating with backend engineers and product teams.
• Practical experience with modular architecture.
• Experience developing and scaling large codebases.
• Knowledge of Apple Liquid Glass design language and WCAG accessibility standards.
• Proficiency using AI-assisted tools, such as GitHub Copilot, OpenCode, or other agentic coding tools, in daily software development.

Bonus points if you have

• Experience with large-scale, high-traffic mobile applications.
• Experience with A/B testing frameworks.
• Hands-on experience with the Android ecosystem or backend development, or a strong willingness to expand into these areas.
• Openness to working across mobile platforms or exploring backend systems as cross-functional teams evolve.
• Contributions to open-source projects or a strong GitHub profile.
• Experience working in an Agile/Scrum environment.

What's in it for you

• Well-located offices with fully equipped kitchens, bicycle parking, green terraces, and work tools such as raised desks, ergonomic chairs, and interactive conference rooms.
• A 16-inch or 14-inch MacBook Pro, or a corresponding Dell with Windows, plus necessary accessories.
• A cafeteria plan with benefits such as medical, sports, lunch packages, insurance, and purchase vouchers.
• Employer-funded English classes related to the role.
• A training budget, inter-team tourism, hackathons, and an internal learning platform with multiple trainings.
• An additional day off for volunteering, usable individually or with a group.
• Social events including Spin Kilometers, Family Day, Fat Thursday, and Advent of Code.

Additional work environment and technology

• Join a team of specialists who share knowledge and experience.
• High autonomy in team organization, continuous development, and selecting technology appropriate to solve problems.
• A developer platform and internal self-service ecosystem using Kubernetes, Docker, Consul, GitHub, and GitHub Actions.
• Modern AI tools to automate repetitive tasks and support development of new and existing services.
• Create solutions used by millions of customers.
• Work at scale with more than 1,000 microservices, the open-source Hermes data bus handling 300K+ requests per second, a Service Mesh handling 1M+ requests per second, tens of petabytes of data, and production machine learning.