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JetBrains

Staff Software Developer, Kotlin Libraries

JetBrains

. Create and maintain foundational libraries for Kotlin core primitives used by hundreds of thousands of developers .

Posted 9/22/2026full-timeBerlin • GermanyLeadWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in JVM Development and Kotlin API design, with a strong ability to create foundational libraries and write comprehensive design documents. Proficient in performance engineering and understanding complex systems within software engineering.

Highest-signal resume keywords
JVM DevelopmentKotlin API DesignPerformance EngineeringDesign Document WritingDomain Expertise

ATS Keywords

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Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills
KotlinJava Standard LibraryAPI DesignPerformance EngineeringSoftware Engineering
Soft Skills
Strong ReasoningTechnical Decision-Making
Industry Keywords
Computer ScienceDesign CommitteeStandard ToolsLanguage Features

Tech Stack

Tools & technologies
JavaKotlin

About the role

Key responsibilities & impact
  • Create and maintain foundational libraries for Kotlin core primitives used by hundreds of thousands of developers
  • Become an expert in specific domains of computer science and software engineering
  • Participate in a design committee shaping the Kotlin API
  • Participate in creating standard Kotlin tools, specifications, and language features

Requirements

What you’ll need
  • JVM development experience down to the implementation details of the Java standard library
  • Strong understanding of the relevant domain
  • Ability to write design documents for complex systems with strong reasoning behind trade-offs and technical decisions
  • Experience in performance engineering or API design

Benefits

Comp & perks
  • Strong base salary; competitive pay reflecting skills and experience
  • Flexible work location; work from home or from the office
  • Remote work up to 30 days per year from abroad
  • Extra time off
  • Medical insurance allowance for you and your family
  • Learning and development opportunities, including conferences, courses, and language classes
  • Relocation support
  • Language classes
  • Hot meal or lunch allowance on workdays
  • Mental health support and access to professional mental health services
  • On-site gym or sports club stipend
  • Internal events, company-wide celebrations, and team gatherings