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 Apply for Job Share Job 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     Apply now First NameLast NameEmailPhoneResume/CV Upload File No file chosen 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 Dear potential Flixie,  At Flix, we are committed to fostering diversity and inclusion. To support this initiative, we invite all applicants to complete our demographic questions on voluntary basis. Your responses will be processed as anonymized data and not linked to your profile, and thus assessed for statistical purposes and internal research.  If you prefer not to provide this information, simply click on "I do not wish to answer." Be assured that neither the decision not to participate nor your answers will have an impact on your application, and your answers will remain anonymous and unidentifiable to you individually. The decision on your application will be made independently from your participation and the information you provide.  We appreciate your cooperation in advance!  What gender do you identify as? / Mit welchem Geschlecht identifizierst du dich?Man / männlichWoman / weiblich Non-binary / nicht-binär I prefer to self-describe / Andere Selbstidentifikation I do not wish to answer / Ich möchte nicht antworten By submitting this application, I confirm that I have read and accept the Privacy Policy. Submit...

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