Senior KMP Engineer (Mobile & Backend)

Our requirements

• We are looking for strong engineers who enjoy solving product and technical challenges across multiple layers of the technology stack.
• Strong commercial experience in mobile application development with Kotlin or Kotlin Multiplatform.
• Deep understanding of modern Android OR iOS architectures and software design principles.
• Strong Kotlin skills and experience building high-quality, production-grade applications.
• Some backend development experience with Java, Spring Boot, APIs, and microservices
• Familiarity with distributed systems, event-driven architectures, and modern engineering practices.
• Experience with CI/CD, automated testing, and production environments.
• Ability to take end-to-end ownership of features from design through production.
• Strong communication and collaboration skills.

Optional

• Experience in fintech, banking, payments, or other regulated industries.
• Experience with Apple Pay, Google Pay, wallet technologies, or payment integrations.
• Experience building modular mobile applications, SDKs, or shared libraries.
• Experience with observability, performance optimization, and production incident analysis.

Your responsibilities

• Develop shared business logic across mobile platforms using Kotlin Multiplatform (KMP).
• Design and build backend services and APIs using Java, Kotlin, and Spring Boot.
• Build and enhance customer-facing mobile features used by real customers every day.
• Work with cloud services, CI/CD, observability, monitoring, and production systems.
• Improve scalability, reliability, performance, security, and user experience.
• Collaborate closely with product, design, architecture, security, and platform teams.
• Drive engineering excellence through technical leadership, mentoring, and best practices.

About the project

This is how we organize our work

This is how we work on a project

• Clean Code

Why Join Us?

• Build products used daily by millions of customers.
• Work on large-scale, business-critical systems processing millions of real-time financial transactions every month.
• Take full end-to-end ownership of features, from design and implementation to deployment and production support.
• Help shape the future of our mobile platform strategy through Kotlin Multiplatform (KMP).
• Collaborate in small, high-impact teams where engineers have real influence on technical decisions.
• Solve challenging problems across mobile development, backend services, cloud infrastructure, scalability, reliability, and security.
• Be part of an engineering culture where AI is used every day as a practical development tool, accelerating delivery and enabling engineers to focus on solving meaningful business and technical challenges.

Development opportunities we offer

• conferences in Poland
• development budget
• support of IT events
• technical knowledge exchange within the company

Benefits

• sharing the costs of sports activities
• private medical care
• sharing the costs of foreign language classes
• fruits
• integration events
• corporate gym
• coffee / tea
• drinks
• birthday celebration
• employee referral program

Recruitment stages

• 1.
  Rozmowa telefoniczna – wstępna rozmowa z Rekruterem
• 2.
  Rozmowa kwalifikacyjna – spotkanie z przedstawicielem firmy

Integral Solutions