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Warsaw | Expertini

Urgent! Mid-Level Kotlin Backend Developer [Remote] in Warsaw | 300Brains Sp. z o. o. | Expertini

Mid Level Kotlin Backend Developer [Remote]



Job description

Mid-Level Kotlin Backend Developer


 


[REMOTE]


 


About us:


We are an international, Polish-American company called 300Brains, operating in the area of Information Technology with the aim of supporting international companies, primarily startups, in the implementation of their brilliant ideas.


 We’re looking for a skilled Kotlin Backend Developer to join an international team working on a distributed ledger-based platform for the insurance industry.

You’ll play a key role in maintaining and expanding a microservices-based backend built fully in Kotlin.


 


✅ What you’ll do:




  • Design, develop, and maintain Kotlin microservices




  • Collaborate within a Scrum team: participate in daily stand-ups, sprint planning, and retrospectives




  • Write clean, maintainable, well-tested code




  • Take part in code reviews and propose architectural improvements




  • Interact with RESTful APIs and smart contract logic




  • Contribute to technical documentation and deployment processes




🛠 Required skills:




  • 2+ years of commercial Kotlin experience or 3+ years of Java with strong willingness to transition to Kotlin




  • Solid understanding of backend development (microservices, REST APIs)




  • Familiarity with testing methodologies (unit & integration tests)




  • Strong communication skills in English (spoken and written)




🌟 Nice to have:




  • Knowledge of Distributed Ledger Technology or blockchain (Corda in particular)




  • Experience with cloud environments (GCP preferred), Docker, or Kubernetes




  • Familiarity with frontend tech (JS/React) is a plus for cross-functional collaboration




🎁 What we offer:




  • 20 days of paid vacation annually – take your well-deserved break




  • Agile training program with a certified diploma from 300Brains




  • Personal training & conference budget to grow your skills




  • Work with international professionals on cutting-edge projects




  • We support your passions – we’ll help finance your hobby




  • Work your way – remote work!




  • Access to a comprehensive medical and sports benefits package




 


Do IT Smart!


 


Required Skill Profession

Computer Occupations



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