Principal Android Engineer (Kotlin/Compose)

Location: 100% remote work 
Salary: 160 – 175 PLN net/h (B2B via Experis)


Responsibilities:
•    Own the app’s most ambiguous and high-risk initiatives, from problem definition through to production release.
•    Define technical direction within the assigned area, create solution designs and architectural decision records, and support decisions with data.
•    Drive application stability, performance, and overall app health improvements across modules and teams.
•    Work across the full Kotlin/Compose codebase, including UI, state management, data layers, networking, SDK integrations, and build systems.
•    Collaborate with Product Managers, Engineering Managers, and stakeholders to clarify scope, evaluate trade-offs, and proactively identify risks with recommended solutions.
•    Lead design reviews and promote high standards for testing, monitoring, and release processes.
•    Investigate and resolve complex crashes, ANRs, and regressions, including issues related to threading and third-party SDKs.
•    Mentor senior engineers to ensure knowledge sharing and sustainable decision-making within the team.
•    Present and demonstrate solutions to both technical and non-technical audiences.


Requirements:
•    8+ years of Android development experience.
•    Expert-level knowledge of Kotlin, Jetpack Compose, Coroutines/Flow, and large-scale multi-module architectures.
•    Proven experience leading architecture initiatives in large, multi-team applications, including staged rollouts and ownership of crash and ANR reduction.
•    Ability to become productive in a large codebase within a short timeframe and confidently make technical decisions when needed.
•    Strong English communication skills, both written and spoken, with technical and non-technical stakeholders.
•    Strong understanding of Object-Oriented Programming (OOP), Design Patterns, SOLID principles, and clean coding practices.

Nice to Have:
•    Experience with application performance optimization, startup performance improvements, navigation frameworks, or automotive-related projects.
•    Experience working as a contractor embedded within product teams.


Our offer:
•    MultiSport Plus
•    Group insurance
•    Medicover Premium