Senior Backend Engineer (Ruby/Go)

<p><strong>Appodeal</strong> is a dynamic US-based product company with a truly global presence.</p> <p>We have offices in <strong>Warsaw, Barcelona and Virginia </strong>along with remote team members located around the world.</p> <p>Our company thrives on diversity, collaboration, and innovation, making us a leader in the mobile app monetization space.</p> <p><strong>Why Appodeal?</strong></p> <p>At Appodeal, we’re more than just a company—we’re a team united by a common mission: <strong>to help every person discover and grow their talents!</strong></p> <p>We take pride in our cutting-edge product and our internationally dispersed team of talented professionals.</p> <p>Here’s what we value, and what we hope you do too:</p> <ul> <li><strong>Continuous Learning and Growth:</strong> We are passionate about learning, growing personally, and building rewarding careers.</li> <li><strong>Making an Impact:</strong> We are committed to building a history-defining company that leaves a lasting impact on the mobile app industry.</li> <li><strong>Solving Exciting Challenges:</strong> We tackle complex problems every day, supported by a team of world-class professionals and mentors.</li> <li><strong>Enjoying the Journey:</strong> We believe in having fun while working toward our goals.</li> </ul>The team is looking for a<strong> Senior Backend Engineer </strong>to make it even stronger.<br/><strong><br/></strong> <h3><strong>Requirements:</strong></h3> <strong>Backend Development</strong> <ul> <li>5+ years of professional software development experience</li> <li>3+ years of hands-on Ruby on Rails experience in production environments</li> <li>Strong understanding of Go fundamentals and experience building production services</li> <li>Proficiency with SQL, particularly PostgreSQL (complex queries, performance optimization, indexing strategies)</li> </ul> <strong>Data &amp; Analytics</strong> <ul> <li>Experience with OLAP databases and columnar storage systems (Clickhouse or similar: Druid, Vertica, etc.)</li> <li>Hands-on experience with data pipeline development and orchestration</li> <li>Understanding of ETL/ELT patterns and data processing workflows</li> </ul> <strong>Distributed Systems</strong> <ul> <li>Production experience with message streaming platforms (Kafka, RabbitMQ, or similar)</li> <li>Understanding of event-driven architectures and async processing patterns</li> <li>Experience with distributed systems challenges (consistency, reliability, scalability)</li> </ul> <strong>Infrastructure &amp; Performance</strong> <ul> <li>Practical experience with caching strategies using Redis, Memcached, or similar</li> <li>Understanding of database performance tuning and query optimization</li> <li>Experience debugging and resolving production issues in complex systems</li> </ul>   <h3><strong>Responsibilities:</strong></h3> <ul> <li>Design, develop, and maintain high-load backend services in Ruby and Go.</li> <li>Own end-to-end delivery of backend features, from design and implementation to deployment and monitoring.</li> <li>Work closely with Product and Data teams to experiment with and roll out monetization strategies.</li> <li>Actively participate in incident response, root-cause analysis, and post-mortems.</li> <li>Ensure accurate event tracking, logging, and metrics for monetization and system health.</li> <li>Collaborate with Data Science/Analytics teams to expose reliable data pipelines.</li> <li>Build dashboards and alerts to monitor system performance and revenue-critical KPIs.</li> <li>Write clean, maintainable, and well-tested code (unit, integration, and load tests).</li> <li>Conduct code reviews and help raise the overall engineering bar.</li> <li>Reduce technical debt and continuously improve system architecture.</li> <li>Translate product and business requirements into robust technical solutions.</li> <li>Take ownership of key services or domains within the mediation platform.</li> <li>Proactively identify risks, bottlenecks, and improvement opportunities.</li> <li>Influence the technical roadmap and long-term platform strategy.</li> </ul> <p>With an outstanding product and a mission that excites and inspires, Appodeal offers a unique opportunity to make an impact while being part of an amazing team.</p> <p><strong>Join us</strong> and help shape the future of mobile app success!</p>