19906 / Senior Android Application Developer (Technical Lead)

Senior Android Application Developer (Technical Lead)

Location : London, UK

Job details-

Mandatory Requirements

• Experience: 6+ Years
• Rate- 430GBP/day/ Salary- 70-80K/annum
• Notice Period: Immediate to 30 Days
• Work Authorization: Valid UK Work Permit

Job Description

• Expert-level proficiency in Kotlin and strong Android SDK fundamentals.
• Hands-on experience with Jetpack Compose and interest in developing new features using Compose.
• Proven experience building, scaling, and maintaining consumer-facing Android applications.
• Experience working in large, modular Android codebases.
• Strong knowledge of RxJava or equivalent reactive programming frameworks.
• Strong testing mindset with experience in:
  • JUnit
  • Espresso
  • Unit Testing
  • Screenshot/UI Testing
• Product-focused development approach with experience in experimentation, analytics, and iteration.
• Strong expertise in Android performance profiling and optimisation.
• Solid understanding of Object-Oriented Programming and design patterns.
• Comfortable leveraging AI-powered development tools such as Claude Code.
• Excellent collaboration and communication skills.
• Experience working with monetisation, subscriptions, credits systems, and in-app purchase flows.
• Strong computer science fundamentals including algorithms, data structures, concurrency, and multithreading.

Good to Have

• Computer Science or related technical degree.
• CI/CD experience (TeamCity or similar).
• Experience with Appyx, RIBs, MVICore, or similar architectures.
• Kotlin Coroutines and Flow.
• gRPC, Protobuf, or schema-driven API tools.
• Socket-based networking and binary protocols.
• Gradle build tooling at scale.
• Experience managing multiple app flavours from a single codebase.
• A/B testing frameworks and feature flagging.
• Analytics, remote monitoring, and performance metrics.

Key Responsibilities

• Design, develop, and deliver Android features for millions of users.
• Own and drive technical and product initiatives from concept through production support.
• Build modern Android UI using Jetpack Compose and contribute to migration from XML-based UI.
• Collaborate closely with Backend, iOS, QA, Product, and Design teams.
• Work with Protobuf/gRPC-based APIs and own the client-side implementation.
• Develop and maintain automated test coverage using JUnit, Espresso, and visual regression testing.
• Ensure application quality through thorough end-to-end testing across supported devices.
• Run A/B tests, evaluate results, and optimise user experience.
• Participate in code reviews and mentor team members.
• Contribute to incident management, root cause analysis, and post-mortem activities.
• Build and enhance monetisation features including subscription and credit-based systems.
• Leverage AI tools to accelerate development, experimentation, and delivery.