Fullstack Mobile Developer ( Kotlin)
Summary
Build and maintain a large-scale fintech platform’s mobile apps and backend services using Kotlin Multiplatform, Spring Boot, and cloud-native tools to process real-time payments and financial integrations.
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
Proactive, “Can-Do” attitude
Strong problem-solving and system-thinking abilities
What we offer: