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Fullstack Mobile Developer (Kotlin) (m/k)
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Offer summary

(Summary generated by AI based on the full job description)

The project involves a fintech platform supporting real-time digital payments and transactions. Required skills include Kotlin Multiplatform (KMP), Spring Boot, Kafka, Docker, Kubernetes with experience in microservices and client architecture. Responsibilities include designing, developing, and maintaining mobile systems, full ownership of fintech products, and ensuring code quality and system performance. The salary ranges from 6500 to 7500 Euro net.

newyou can start ASAP

Fullstack Mobile Developer (Kotlin) (m/k)

Company: Integral Solutions

from: 17 July 2026
to: 16 August 2026
salary not specifiedB2B contract (full-time)
Salary details

B2B: 6500 - 7500 Euro/month - netto

Offer parameters
level:senior
working mode:remote • hybrid
location:Warszawa, Masovian
Warszawa, Masovian

Requirements

Expected technologies

Kotlin
Kotlin Multiplatform
Spring Framework
Spring Boot
Kafka
REST APIs
Docker
Kubernetes

Optional technologies

AWS

Our requirements

  • 5+ years of software development experience
  • Strong Fullstack experience with a significant focus on Mobile
  • Hands-on experience with Kotlin Multiplatform (KMP)
  • Deep understanding of client-side architecture and Clean Architecture
  • Experience with Spring Framework and Spring Boot
  • Strong understanding of distributed systems and microservices architecture
  • Experience working with Kafka, REST APIs, and event-driven architectures
  • Experience with Docker, Kubernetes, and CI/CD processes

Optional

  • Familiarity with AWS – an advantage

Your responsibilities

  • Design, build, and maintain complex mobile systems at scale, integrating advanced technologies
  • Develop advanced fintech products with end-to-end ownership and operational responsibility
  • Lead and deliver fullstack solutions from concept to production
  • Collaborate closely with cross-functional teams to continuously improve the product
  • Design and implement scalable and robust software architectures
  • Ensure high code quality, performance, and system reliability
Company

About the project

We are looking for a talented and passionate Fullstack Mobile Developer to join our team and contribute to the development of innovative, customer-facing digital products in a fast-paced and technology-driven environment.
As part of the team, you will work on a large-scale fintech platform supporting real-time digital payments, money transfers, account balance management, merchant payments, and financial service integrations.
The solution serves a large user base and processes high volumes of transactions through a combination of mobile applications, distributed backend services, APIs, and secure transaction processing systems.
This is an opportunity to work on a business-critical product where scalability, reliability, security, and user experience are at the core of every engineering decision.
The platform operates in a highly demanding environment, requiring modern software architecture, seamless integration between mobile and backend systems, and the ability to deliver performant solutions at scale.
Working on such a product offers exposure to complex technical challenges, high-traffic systems, and the unique demands of building secure financial services used by millions of end users.

Benefits

  • sharing the costs of sports activities
  • private medical care
  • integration events
  • no dress code
  • christmas gifts
  • employee referral program

Recruitment stages

  • 1.
    Rozmowa telefoniczna – wstępna rozmowa z Rekruterem
  • 2.
    Weryfikacja u klienta – ocena dopasowania do wymagań biz.
  • 3.
    Rozmowa kwalifikacyjna – spotkanie z przedstawicielem firmy

Integral Solutions

Integral Solutions, Informatica Platinum Partner Enterprise, od ponad 20 lat dostarcza nowoczesne rozwiązania IT dla biznesu, oferując usługi m.in. w zakresie integracji danych, Data Engineering (Big Data) oraz Data Governance. Specjalizując się w rekrutacji pracowników z branży IT, nie tylko w obszarze danych, pomaga Klientom powiększać zespoły projektowe o profesjonalistów IT.
Fullstack Mobile Developer (Kotlin) (m/k)
I apply to:
Integral Solutions
Warszawa, Masovian
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