Principal Android Engineer (Kotlin/Compose)

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

Our offer:

• Experience with application performance optimization, startup performance improvements, navigation frameworks, or automotive-related projects.
• Experience working as a contractor embedded within product teams.
• MultiSport Plus
• Group insurance
• Medicover Premium

Project details

100% remote work

Salary: 160 – 175 PLN net/h (B2B via Experis)

Hours: Kontrakt

Reference Number: 29909

Posted: 15 października 2026

contract-type: B2B

Apply by: 15 listopada 2026

• Start: flexible
• Location: Łódź, Lódzkie, PL