IS

Senior Fullstack Mobile Engineer (KMP/Java)

Salary
€7K–€7.5K/mo
Hiring from
Poland
Work type
Remote
Posted

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Senior Fullstack Mobile Engineer (KMP/Java)

Job title: Senior Fullstack Mobile Engineer (KMP/Java)

Location: Remote anywhere from Poland
Work mode: Remote
Type of cooperation: B2B contract
Salary range: B2B: 7000 - 7500 Euro/month - netto

About the company/project:

  • Build the Next Generation of Digital Financial Products

    Join a team building one of the largest digital financial platforms in its market, serving millions of customers and processing millions of real-time financial transactions every month.

    This is a unique opportunity to work on products that have become a natural part of users' daily lives, delivering fast, secure, and seamless financial experiences at scale. As a Senior KMP Engineer, you will contribute across the entire technology stack - from customer-facing mobile applications and shared cross-platform logic to backend services, APIs, cloud infrastructure, and large-scale production systems.

    Our core technology stack includes Kotlin, Kotlin Multiplatform (KMP), Java, and Spring Boot.

    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.

Responsibilities:

  • What You'll Do

    • 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.

You are an ideal candidate if you have:

What We're Looking For

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.

Nice to have:

  • 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.

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