Senior Software Engineer - Database Optimizer

About the role

Cast AI is seeking a skilled senior software engineer with deep expertise in databases.

It’s more about understanding database underlying technology than just knowing how to use it.

Knowing the implementation details on transactions, wire protocol, WAL, indexes and many other fundamental database features enables us to build a product around it.

The candidate will be able to work on a greenfield project with a high impact on the outcome.

Requirements

• Strong knowledge in one of the following databases: Postgre SQL, My SQL
• Experience as a Database Administrator or in a role with significant hands‑on work with databases
• Strong programming skills in Go and/or C++
• Strong problem‑solving skills and the ability to troubleshoot complex issues in a production environment
• Experience working with and developing performant and robust caching would be an advantage
• Strong written and verbal communication skills in English
• Ability to work independently and collaboratively within a team
• Startup mindset: adaptable, proactive, and comfortable with ambiguity
• A proactive, problem‑solving mindset with a “yes we can” attitude.
• Tools we use daily
• Mostly Golang with C++ in the most critical data pathways
• Extending Envoy with custom network filters
• Click House and Postgre SQL for business metrics
• GRPC and REST APIs
• Git Lab CI with Argo CD as our Git Ops CD engine
• Prometheus, Grafana, Loki, and Tempo for observability
• Deployment charts are written in Helm.
• Resposibilities
• Design, build, and operate database optimization services in Go and C++.
• Develop features for query analysis, index recommendations, and automated performance tuning that deliver measurable database cost savings.
• Extend and maintain integrations with Postgre SQL protocol, cloud database services (RDS, Cloud SQL, Azure Database).
• Implement query parsing, plan analysis, and recommendation algorithms that identify optimization opportunities.
• Develop monitoring and alerting systems for database performance metrics, connection health, and cost tracking.
• Shape public and internal APIs with an eye for simplicity and developer experience.
• Participate in design reviews, code reviews, and occasional customer deep‑dives.

What’s in it for you?

• Competitive salary (€6,500 – €9,000 gross, depending on the level of experience)
• Enjoy a flexible, remote‑first global environment.
• Collaborate with a global team of cloud experts and innovators, passionate about pushing the boundaries of Kubernetes technology.
• Equity options.
• Private health insurance.
• Get quick feedback with a fast‑paced workflow. Most feature projects are completed in 1 to 4 weeks.
• Spend 10% of your work time on personal projects or self‑improvement.
• Learning budget for professional and personal development – including access to international conferences and courses that elevate your skills.
• Annual hackathon to spark new ideas and strengthen team bonds.
• Team‑building budget and company events to connect with your colleagues.
• Equipment budget to ensure you have everything you need.
• Extra days off to help maintain a healthy work‑life balance.
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