Senior Backend Engineer (Ruby on Rails)

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.

• 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)

• 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

• 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)

• 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

• 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!