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Senior Fullstack Engineer

X-FLOW
Posted 4 hours ago
PolandRemoteEngineering & Development
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X-FLOW is a mobile game development company established in 2018. We gained recognition after the release of Happy Color, the most popular digital coloring book and one of the most successful ad-driven mobile apps in the world.


We are currently looking for a Senior Fullstack Engineer for our flagship project, Happy Color.


Key Responsibilities:

  • Design and develop RESTful APIs using PHP/Laravel.
  • Build frontend applications using TypeScript/React with a focus on performance and Developer Experience (DX).
  • Integrate with external services; define and maintain API contracts.
  • Optimize performance, perform profiling, and reduce latency.
  • Design database schemas, handle migrations, indexing, and query optimization.
  • Contribute to quality assurance: write tests (unit/integration/e2e), conduct code reviews, and automate checks.
  • Ensure observability and reliability: implement logs, metrics, alerts, and traces.
  • Participate in designing architectural solutions.


Requirements:

  • 4+ years of experience with PHP, strong knowledge of Laravel (DI, queues, profiling, REST, modularity).
  • 4+ years of experience with TypeScript, strong knowledge of React/Redux Toolkit, routing, build processes, and bundle optimization.
  • Databases: PostgreSQL/MySQL, Redis; experience with schema design, indexes, and transactions.
  • Message Queues/Buses: Kafka — experience with event-driven integrations.
  • Security: OAuth2, JWT.
  • Understanding of DDD, SOLID, 12-Factor App methodology, and observability (Prometheus/Grafana, OpenTelemetry).


Nice to have:

  • Experience with Golang development.
  • Development experience with Ant Design (Antd)
  • 5+.Experience with or understanding of GitLab CI, feature flags, migrations, and blue-green/rolling deployment strategies.
  • Testing tools: Jest, Playwright; for PHP — PHPUnit/Codeception; integration/e2e testing experience.


Technology Stack (Core):

  • Backend: PHP (Laravel), REST, PostgreSQL/MySQL, Redis, Kafka, Clickhouse.
  • Frontend: TypeScript, React, Redux Toolkit.
  • DevOps: GitLab CI, Docker.
  • Observability: Prometheus, Grafana, OpenTelemetry, Sentry.


What We Offer:

  • Competitive salary and benefits package.
  • Opportunity to work with a talented and passionate team in a creative and dynamic environment.
  • Flexible working hours and remote/office work options.
  • Career growth and professional development opportunities.
  • A fun and inclusive company culture that celebrates diversity and creativity.


Join us and let’s create great product together!

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