Backend/Platform Engineer

Tzafon is a foundation model lab building scalable compute systems and advancing machine intelligence, with offices in San Francisco, Zurich & Tel Aviv. We’ve raised over $12m in funding to advance our mission of expanding the frontiers of machine intelligence.

We're a team of engineers and scientists with deep backgrounds in ML infrastructure & research. Founded by IOI and IMO medalists, PhDs, and alumni from leading tech companies, we train models and build infrastructure for swarms of agents to automate work across real-world environments.

You will:

• Design, version, and operate core APIs across our systems

• Orchestrate processes with isolation, quotas, and guardrails.

• Implement approvals and audit/replay.

• Stand up observability: OpenTelemetry spans, logs, metrics, replayable traces.

• Drive reliability (SLOs, autoscaling, backpressure, retries).

You have:

• Interest in building scalable systems

• Built and operated real‑time APIs (streams, websockets, or game/RTC‑style).

• Strong data modeling for event logs/traces; comfort with queues & idempotency.

• Experience with sandboxed automation or similar.

• Worked with Go and are comfortable with advanced concurrency patterns

• Security mindset

Nice to haves:

• Temporal/NATS/Kafka experience; ClickHouse/OLAP for traces; Kubernetes, Nomad.

• Billing exposure; SOC2 experience.

Stack: Go, Rust, gRPC, Postgres, Redis, S3, a queue (SQS/Pub/Sub/NATS), Prometheus, Tzafon Waypoint

Life at Tzafon

• Full medical, dental, and vision coverage, plus 401(k) in the US

• Office in SF, Zurich and Tel Aviv

• Early-stage equity in a future-defining company

Visa sponsorship: We do sponsor visas! However, we aren't able to successfully sponsor visas for every role and every candidate. If we make you an offer, we will make every reasonable effort to get you a visa.

Compensation

Compensation starts at $150k-$250k and equity package.