About the Role We're looking for a Senior Backend Engineer to own and scale the infrastructure behind one of the most widely adopted open-source LLM engineering platforms in the world — processing terabytes of AI tracing data per day for thousands of AI teams, including a significant portion of the Fortune 50. We're a small, engineering-heavy team building what many consider the \"Datadog\" of LLM observability. We sit at the intersection of open source, high-throughput data infrastructure, and applied AI — and we're now part of a leading columnar database company, which means the engineers who built the database you'll be optimizing are a Slack message away. This is a hybrid role based in EU timezones, with approximately one week per month in our Berlin office. You can be based anywhere in the EU. Visa sponsorship is not available — you must be legally authorized to work in the EU.
What You'll Do
- Own and optimize the ingestion pipeline: Work on throughput, latency, reliability, and cost efficiency across a high-volume data pipeline that flows from our API through to a ClickHouse-backed analytics store.
- Make ClickHouse sing: Design and evolve schemas, write and tune complex analytical queries, and partner with ClickHouse engineers to push the limits of what's possible at petabyte scale.
- Build backend abstractions: Create reusable, well-documented building blocks so that product engineers can ship data-heavy features without reinventing infrastructure each time.
- Operate production systems: Run and improve cloud deployments across multiple production environments — handling capacity planning, incident response, and monitoring with SRE discipline.
- Make self-hosting effortless: Maintain and improve deployment tooling from a single Docker Compose setup all the way to enterprise-grade Helm chart deployments on Kubernetes.
- Contribute to open source: Everything you ship is public and immediately used by developers worldwide — participate in PR reviews, issue triage, and community engagement.
What We're Looking For
Required:
- Based in the EU and able to work EU timezones; willing to be in Berlin approximately one week per month.
- Legally authorized to work in the EU without company visa sponsorship.
- Hands‑on experience with ClickHouse or other columnar/analytical databases — schema design, query optimization, and managing large‑scale analytical workloads.
- Experience designing, building, and operating high‑throughput data pipelines (streaming and/or batch) capable of processing terabytes of data per day.
- Production experience with observability and distributed tracing systems (metrics, logs, traces) for large-scale, low‑latency services.
- Experience deploying and operating services with Docker and Kubernetes, and applying SRE practices such as capacity planning, incident response, and monitoring.
- Proven ability to take end‑to‑end ownership of backend/platform components and work autonomously in a small, fast‑moving engineering team.
- 3+ years of backend or full‑stack engineering experience.
Nice to Have:
- Experience contributing to or maintaining open-source projects — including PR reviews, issue triage, and community workflows.
- Background at companies working in AI/ML tooling, data infrastructure, or observability.
Compensation & Benefits
- Salary: €90,000 – €160,000 per year, depending on experience
- Meaningful equity in a well-backed, high-growth company (previously Series A/B stage investors; now part of a larger technology organization)
- Small team = large scope and direct impact on product and architecture
- Work with — and get direct access to — world‑class database engineers at the infrastructure layer you depend on daily
- Flexible remote-first culture with regular in‑person time in Berlin
Location … Senior Backend Engineer — Clera, Berlin.
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Mots-clés : Engineering.