Senior Fullstack Engineer

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    "datePosted": "2026-05-28",
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    "description": "<ul></ul>\n<p><span style=\"font-weight: bold\">X-FLOW</span> is a mobile game development company established in 2018. We gained recognition after the release of <span style=\"font-weight: bold\">Happy Color</span>, the most popular digital coloring book and one of the most successful ad-driven mobile apps in the world. We take pride in our diverse and talented team and partners, spread across the UK, Cyprus, the Netherlands, and other regions worldwide.</p>\n<p><br></p>\n<p>We are currently looking for a<span> </span><span style=\"font-weight: bold\">Senior Fullstack Engineer</span> for our flagship project, <span style=\"font-weight: bold\">Happy Color</span>.</p>\n<p><br></p>\n<p><span style=\"font-weight: bold\">Key Responsibilities:</span></p>\n<ul>\n<li>Design and develop RESTful APIs using PHP/Laravel.</li>\n<li>Build frontend applications using TypeScript/React with a focus on performance and Developer Experience (DX).</li>\n<li>Integrate with external services; define and maintain API contracts.</li>\n<li>Optimize performance, perform profiling, and reduce latency.</li>\n<li>Design database schemas, handle migrations, indexing, and query optimization.</li>\n<li>Contribute to quality assurance: write tests (unit/integration/e2e), conduct code reviews, and automate checks.</li>\n<li>Ensure observability and reliability: implement logs, metrics, alerts, and traces.</li>\n<li>Participate in designing architectural solutions.<br></li>\n</ul>\n<p><br></p>\n<p><span style=\"font-weight: bold\">Requirements:</span></p>\n<ul>\n<li>4+ years of experience with PHP, strong knowledge of Laravel (DI, queues, profiling, REST, modularity).</li>\n<li>4+ years of experience with TypeScript, strong knowledge of React/Redux Toolkit, routing, build processes, and bundle optimization.</li>\n<li>Databases: PostgreSQL/MySQL, Redis; experience with schema design, indexes, and transactions.</li>\n<li>Message Queues/Buses: Kafka — experience with event-driven integrations.</li>\n<li>Security: OAuth2, JWT.</li>\n<li>Understanding of DDD, SOLID, 12-Factor App methodology, and observability (Prometheus/Grafana, OpenTelemetry).<br></li>\n</ul>\n<p><br></p>\n<p><span style=\"font-weight: bold\">Nice to have:</span><br></p>\n<ul>\n<li>Experience with Golang development.</li>\n<li>Development experience with Ant Design (Antd) 5+.</li>\n<li>Experience with or understanding of GitLab CI, feature flags, migrations, and blue-green/rolling deployment strategies.</li>\n<li>Testing tools: Jest, Playwright; for PHP — PHPUnit/Codeception; integration/e2e testing experience.<br></li>\n</ul>\n<p><br></p>\n<p><span style=\"font-weight: bold\">Technology Stack (Core):</span></p>\n<ul>\n<li><span style=\"font-weight: bold\">Backend:</span><span> </span>PHP (Laravel), REST, PostgreSQL/MySQL, Redis, Kafka, Clickhouse.</li>\n<li><span style=\"font-weight: bold\">Frontend:</span><span> </span>TypeScript, React, Redux Toolkit.</li>\n<li><span style=\"font-weight: bold\">DevOps:</span><span> </span>GitLab CI, Docker.</li>\n<li><span style=\"font-weight: bold\">Observability:</span><span> </span>Prometheus, Grafana, OpenTelemetry, Sentry.<br><br></li>\n</ul>\n<p><span style=\"font-weight: bold\">What We Offer:</span></p>\n<ul>\n<li>Competitive salary and benefits package.</li>\n<li>Opportunity to work with a talented and passionate team in a creative and dynamic environment.</li>\n<li>Flexible working hours and remote/office work options.</li>\n<li>Career growth and professional development opportunities.</li>\n<li>A fun and inclusive company culture that celebrates diversity and creativity.</li>\n</ul>\n<p><br></p>\n<p><span style=\"font-weight: bold\">Join us and let’s create great product together!</span></p>\n<p><br></p>\n<p><em>When you apply for this role, we process your personal data in accordance with our Candidate Privacy Notice (<a href=\"https://xflowgames.com/candidate-privacy-notice\" target=\"_blank\" rel=\"noopener noreferrer\">https://xflowgames.com/candidate-privacy-notice</a>).</em></p>",
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