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Senior Software Engineer, Android - KMP (Warsaw)

SumUp
Mobile Developer • Senior • On-site • Full-time • 📍 Warsaw
📄 View original listing (EN)

SumUp's Point-of-Sale (POS) solution helps cafes, shops, bars, hair salons and other businesses operate and grow, integrated into the SumUp SuperApp. As a Senior Android Developer in this B2B-based Warsaw role, you will help implement the company's Kotlin Multiplatform (KMP) strategy for shared Android and iOS development, working in a cross-functional team. The role offers a monthly salary range of 18,850-29,660 PLN.

Stack

androidiosKotlin

Responsibilities

  • ▹Build new features for the item catalog within the SumUp SuperApp
  • ▹Improve the application architecture and contribute to the Kotlin Multiplatform strategy
  • ▹Enhance and maintain the unified Android app distributed across 60+ countries
  • ▹Shape the product's evolution by identifying improvement opportunities and contributing to daily decision-making
  • ▹Write thorough documentation and implement robust testing before shipping features
  • ▹Collaborate closely with Designers, Product Managers and Android engineers for a unified UX across platforms

Requirements

  • ▹8+ years of experience in mobile engineering with Android and Kotlin
  • ▹2+ years of experience with Jetpack Compose
  • ▹Solid understanding of software design patterns (e.g. MVVM, MVI) and modular, scalable app architectures
  • ▹Good knowledge of reactive programming (Flow, Coroutines and concurrency)
  • ▹Strong grasp of testing best practices
  • ▹Strive for clean code with a balance of pragmatism and perfection
  • ▹Keen interest in multi-platform development using Kotlin Multiplatform

Soft skills

User-centric mindsetPrecisionStructured communicationCross-functional collaboration

What we offer

  • ▹Work from the Warsaw office in the Mennica Legacy Tower with a skyline terrace
  • ▹VSOP program with a stake in SumUp's success
  • ▹On-site gym or Multisport Card subsidized by SumUp
  • ▹Health and life insurance for you and your family
  • ▹PPK (Employee Capital Plan) with joint contributions
  • ▹26 days of paid leave plus public holidays and special leave days
  • ▹1-month sabbatical after 3 years of service and referral bonus
  • ▹Salary range: 18,850-29,660 PLN per month

About the company

SumUp is a global, multicultural company building financial tools for small businesses, with a Warsaw office in the Mennica Legacy Tower.