Fullstack Mobile Developer (Kotlin, Java Backend)

October 21, 2026

Remote

Junior

Warsaw, Białystok, Gdańsk, Katowice, Kraków, Lublin, Łódź, Poznań, Rzeszów, Wrocław, Poland

Keep in mind

Original vacancy is in Polish
You will likely need Polish for the job. The employer can confirm

Description

We are recruiting on behalf of a client with 15 years of experience in the IT market. The company develops knowledge management and customer experience solutions integrated with social media, email, CRM, chatbots, product catalogues, surveys and e-learning modules for agents. The team builds modern digital financial products used by a large customer base, spanning mobile applications, shared business logic and backend services. The organisation is moving toward smaller teams with greater product ownership, increased code sharing across platforms and the practical use of AI tools in the development process.

Responsibilities

Build and enhance features for mobile applications used by real customers
Develop shared business logic for mobile platforms, primarily with Kotlin Multiplatform (KMP)
Build backend services and APIs using Java/Kotlin and Spring Boot
Work with cloud services, CI/CD pipelines, monitoring and production environments
Optimise performance, reliability, security and user experience
Use AI tools to support development, testing, documentation and problem analysis
Collaborate closely with Product, Design, Architecture, Security and Platform teams
Help shape engineering practices and mentor other developers
Own feature delivery from design through to production

Requirements

Strong experience building mobile applications
Good knowledge of iOS and Android application architecture and their key components
Strong knowledge of Kotlin and modern mobile architecture patterns
Experience building production applications, with a focus on quality, performance and maintainability
Backend experience with Java and Spring Boot
Knowledge of APIs, microservices and event-driven systems
Experience with CI/CD, automated testing and production environments
Ability to independently take features from design through to production
Strong communication skills and experience working with multiple teams simultaneously
Experience with Kotlin Multiplatform is a major plus
Strong experience with other cross-platform technologies is also welcome
Proactive, solution-oriented approach, systems thinking and the ability to analyse complex problems

Conditions

Full-time employment
Remote work
Attractive compensation; amount not specified
Work on modern digital financial products with a large user base
Join the transition to smaller teams with greater product ownership and active use of AI in development