Fullstack Mobile Developer ( Kotlin)

Integral Solutions - Informatica Distributor; Warszawa; On-site; PLN 314,025 - 362,337; Full time

Job summary

Integral Solutions - Informatica Distributor is seeking an experienced Fullstack Mobile Developer to join our fintech-focused team working on a large-scale digital payments platform. You will design, build, and own mobile systems and fullstack solutions, collaborating across engineering, product, and backend teams to ensure scalable, secure, and high-performance services.

The role emphasizes hands-on Kotlin Multiplatform, Clean Architecture, and modern microservices with Kafka, REST APIs,

Qualifications

• 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 with Kafka, REST APIs, and event-driven architectures.
• Experience with Docker, Kubernetes, and CI/CD processes.
• Familiarity with AWS – a bonus.

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.

Skills

5+ years experience

Fullstack Mobile

Kotlin Multiplatform

Clean Architecture

Spring Framework

Spring Boot

Distributed systems

Microservices

Kafka

REST APIs

Event-driven architectures

Docker

Kubernetes

CI/CD

AWS

Tools

Docker

Kubernetes

CI/CD

AWS

Job description

Job title: Fullstack Mobile Developer (Kotlin Multiplatform)
Location: Poland / Remote/ Warsaw
Work mode: Remote/ Hybrid
Type of cooperation: B2B contract
Salary range: B2B 6500 - 7500 Euro/month- netto

About the company/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.

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

You are an ideal candidate if you have:

• 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
• Familiarity with AWS – an advantage

Nice to have:

• Strong communication and teamwork skills
• Ability to thrive in a fast-paced, dynamic environment
• Strong problem-solving and system-thinking abilities