DevOps Engineer

Bookbot is a recommerce platform that operates in 9 countries, ships books to 40 countries and has already sold over 10 million books. Every day we sell around books and receive a little bit more. We are the 16th fastest growing tech startup in the CEE region.

We're seeking someone who feels good with concepts like GitOps or Infrastructure as Code and can support our CTO David by taking over infrastructure management. You shouldn't be afraid to propose new solutions and independently choose the most effective technological strategies. You should also be able to speak at least some level of czech language.

Responsibilities:

• Expanding and maintaining infrastructure on AWS.
• Monitoring the infrastructure.
• CostOps.
• Managing the remote development environment.
• Ensuring seamless transitions between technologies without downtime.

Projects you'll work on:

• Kafka Optimization & Reliability
  • Designing and managing Kafka consumers with auto-distribution across a worker pool
  • Implementing circuit breakers and consumer-based topic control
  • Leading zero-downtime migration to self-managed Kafka using Strimzi and MirrorMaker
• CDC with Debezium
  • Streaming data from MySQL to Snowflake (including audit logs)
  • Implementing transactional outbox patterns
• Secrets Management
  • Replacing the current secrets pipeline (AWS Secrets → Terraform → K8s Secret) with a more flexible solution like External Secrets Operator
• File Handling & S3 Uploads
  • Refactoring image upload pipeline to use UUIDs instead of auto-increment IDs
  • Enabling direct uploads to S3 using presigned URLs
• Scalability & Infrastructure
  • Revamping Kubernetes resource limits/requests
  • Implementing autoscaling using Karpenter and KEDA
  • Leveraging spot instances for cost optimization
• Testing & CI/CD Enhancements
  • Integrating Cypress tests into the CI pipeline
  • Finalizing per-PR deployment isolation:
    • Separate instances of MailDev
    • Isolated Manticore index clusters
    • Kafka topic cleanup automation
  • Implementing simple A/B testing across backend and frontend
• Setting up alerts and dashboards for everything—we need to know about infrastructure issues before they happen, or at least before customer support does.
• Defining blueprints so that regular developers can easily set up monitoring for their features.

DevOps Tech Stack:

• Kubernetes, AWS.
• Terraform, ArgoCD, GitHub Actions, Prometheus, Loki, Manticore Search, Redis, Kafka, Keda, Aurora, MySQL.

How we work:

• The Platform team currently consists of 3.5 people, including CTO David. Altogether, we have 23 developers.
• We have daily stand-ups, weekly Backend Tech Meetings and Frontend Tech Meetings, and bi-weekly deep dives into new features.
• We work from offices near Kolbenova metro station, with occasional home-office flexibility.
• We're straight-talking and often share a laugh, even about inappropriate jokes.

What we offer:

• Our budget for this position czk/monthly.
• Work with awesome people like the internal systems guru Simon, and CTO David. The team is full of good vibes and we sometimes grab a beer or go rock climbing together.
• Listen to a podcast with David (CTO) & Simon to get an even better understanding of how our development team works and what we're currently tackling.
• We build everything in-house, so there's a wide variety of problems to solve—you won't get bored, and there's always something to work on and innovate.
• You'll see the results of your work immediately—when we rework or optimize a process, it typically has visible positive effects, not just on the website but also in the warehouse, shipping, customer support, or intake. If something goes wrong, you'll hear about it within minutes
• An amazing opportunity to have a significant impact on the future of Knihobot and to grow with us exponentially.
• MultiSport card, employee discounts on buying and selling books, and discounts with partners.
• Professional development budget.
• One extra week of vacation after one year of cooperation, two extra weeks after two years.
• Option to gain ESOP (employee stock ownership plan) and have a financial stake in the company's success.
• An informal environment and a pragmatic approach to getting things done.