Senior iOS Developer

4 468.94 - 6 284.45 USDNet per month - B2B
Mobile

Senior iOS Developer

Mobile
Marszałkowska 115, Warszawa

Crsel sp. z o.o.

Full-time
B2B
Senior
Remote
4 468.94 - 6 284.45 USD
Net per month - B2B

Job description

As an iOS Developer at Crsel, you will:


  • Design, develop, and maintain high-quality iOS applications with more than 400k monthly users

  • Build and ship new features in close collaboration with product, design, and founders

  • Take ownership of complex parts of the app, from architecture to performance optimization

  • Continuously improve code quality, stability, and scalability

  • Participate in architectural decisions and evolve our mobile tech stack

  • Troubleshoot, debug, and optimize the app for performance and reliability

This role requires strong communication skills — you'll be in constant dialogue with founders, discussing ideas, trade-offs, and product direction.


Qualifications:


  • 5+ years of professional iOS development experience

  • Strong knowledge of Swift, UIKit, and SwiftUI

  • Background in creative, media, or content-focused apps or active use of such apps

  • Experience with reactive or unidirectional architectures (TCA, Redux, MVVM, Clean Architecture)

  • Solid understanding of AVFoundation and media processing

  • Experience working with Firebase services

  • Familiarity with the App Store submission and review process

  • Strong English skills for technical and product communication

  • Deep understanding of software development best practices, design patterns, and architecture

  • Strong problem-solving skills and ability to work collaboratively in a team

  • Passion for building innovative, high-quality mobile products


Nice-to-have:


  • Bachelor's degree in Computer Science, Software Engineering, or a related field

  • Experience with Metal or Core Image for graphics and video processing

  • Understanding of product analytics (retention, cohorts, funnels, etc.)

  • Experience with subscription monetization

  • Remote Config & A/B testing experience


We Offer:


  • Remote or hybrid work model

  • No corporate BS and meetings that could have been an email

  • Opportunity to work on a fast-growing product used by hundreds of thousands of creators

  • Work Closely with Founders: Our founders are not just experienced entrepreneurs , they are big content creators with 9M+ followers. You'll have direct access to their vision, creativity, and insights, shaping the product from the ground up. This is a unique opportunity to work side by side with founders who understand creators, social trends, and viral growth, and see your work impact millions of users.

  • Real ownership and direct impact on product and technical decisions

  • Learning/growth opportunities (trying new tech, shaping architecture)

  • Competitive compensation

  • Flexible schedule and a founder-led, product-focused, high-trust culture


Tech stack

    UIKit

    advanced

    Swift

    advanced

    iOS

    advanced

    Redux

    advanced

    SwiftUI

    advanced

    AVFoundation

    regular

Office location

Published: 25.02.2026

Senior iOS Developer

4 468.94 - 6 284.45 USDNet per month - B2B
Summary of the offer

Senior iOS Developer

Marszałkowska 115, Warszawa
Crsel sp. z o.o.
4 468.94 - 6 284.45 USDNet per month - B2B
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