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