Jobs at X-FLOW

Create high-quality 2D illustrations and character stories for the Happy Color app across varied styles; produce character concepts with strong anatomy, composition, color, light, form, and perspective.

The Support Specialist will handle user requests, coordinate with internal and outsourcing teams, maintain the knowledge base, and ensure quality user communication across different platforms.

Design and build RESTful APIs with PHP/Laravel and frontend apps in TypeScript/React. Integrate external services, optimize performance, design databases, implement observability, write tests and conduct code reviews, and contribute to architectural decisions.

The UA Manager will lead user acquisition campaigns across various channels, analyze performance, and drive growth strategies in mobile game development.

Design, develop and maintain mobile, web (E2E/UI) and API test frameworks; increase coverage for critical flows; integrate tests into CI/CD (PR/nightly/regression), manage flaky tests/quarantines, run test code reviews, and collaborate with development and QA teams to improve testability and developer experience.

Manage daily content release process for Happy Color: prepare and maintain content in internal CMS, ensure accurate on-time releases, improve operations and documentation, collaborate with Art, Development, Support and Social teams, and participate in content planning and production discussions.

Provide timely email and app-store support via Zendesk, reply to reviews, coordinate with Dev/QA and outsourcing teams to resolve bugs, maintain knowledge base and templates, and occasionally handle social media and play the game to reproduce issues.

Design and implement a petabyte-scale analytical system using Java and cloud platforms. Own full lifecycle tasks: architecture, development, performance optimization, debugging, and documentation while balancing performance and complexity.

Lead design and implementation of end-to-end Flutter test automation across unit, widget, integration, golden/visual regression, and API/contract tests. Build test infrastructure in Dart/Flutter, integrate tests into CI/CD with quality gates, monitor app observability and performance, conduct code reviews, and define device matrix and testing standards to ensure app stability and reliability.

Design and build backend microservices in Go and frontend features in TypeScript/React. Integrate external services, optimize performance and scalability, design databases and migrations, implement CI/CD and containerized deployments, ensure test coverage and observability, and contribute to architecture and RFCs.

Lead development of ML solutions to optimize ad monetization and personalization. Build models for targeting, ranking, pricing, revenue prediction, and LTV; design experiments; analyze user behavior; mentor data scientists; collaborate with Product, Engineering, and Analytics to deploy scalable, high-quality ML solutions that improve engagement and revenue.