Kotlin Full-Stack Engineer (Freelance/Service Agreement)
FlixBus
Wrocław, PolandPosted Jul 23, 2026
Kotlin Full-Stack Engineer (Freelance/Service Agreement) City: WroclawDepartment: IT & Engineering Recruiter: Anna Symonenko
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We are looking for a skilled Senior (Full-Stack) Kotlin Engineer as service agreement collaborator. Flix customers worldwide expect a comfortable and seamless experience at our stations as part of their travel experience. Our self-organized, cross-functional and distributed team builds products to enable Flix station managers to scale management of the station inventory, which a wide range of internal tech teams across Flix depend on, and overall serves to improve the experience at our stations for millions of passengers.
Scope of services
Independent management of roadmap epics as topic driver, aligning technical requirements and solutions across the Flix teams together with the product owner
Close interaction with business stakeholders on continuously developing and improving the product vision with business driven mindset
Supporting the development process using an agile environment
Pair and ensemble programming, code reviews, testing, and operations
Delivery of new versions of the product, using continuous integration and delivery
Relevant experience
5+ years of software engineering experience, primarily backend development with a JVM language, including some commercial experience with Kotlin
Solid front-end skills with modern front-end stack
Experience with event-driven architectures; exposure to event sourcing, CQRS, and domain-driven design (DDD) is a plus
Hands-on experience with automation and deployment of applications into cloud infrastructure (e.g., AWS, Azure) using CI/CD pipelines and DevOps best practices
Proficiency in system design and architecture
Solid written and spoken English communication skills
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Contract preference: Umowa o Pracę (employment contract) or B2B contract?What are your salary expectations for a B2B contract (net rate in zloty per 1 hour)?Do you already have a registered business entity in Poland or are you in a position to set one up?Do you require visa/residence sponsorship to be employed in Poland?Do you require visa/residence sponsorship to be employed in Poland?YesNoWhat's your current location (country, city)?What is your earliest possible start date?Do you have experience building event-driven systems?Do you have experience building event-driven systems?YesNoAre you open to taking on front-end tasks (approximately 20–30% of the scope) and developing relevant front-end skills?Are you open to taking on front-end tasks (approximately 20–30% of the scope) and developing relevant front-end skills?YesNoVoluntary Gender Identification
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