
Sazabi
The AI-native observability platform for fast-moving engineering teams.
Seed
Round
Unannounced · 100+ angels
9
Team size
Founded 2025
$77B
Observability TAM
Gartner · cloud obs. by 2027
Backed by
And 90+ more angel investors from leading AI, developer tools, and infrastructure companies.
Thesis
- 01
The outer loop is the new bottleneck. AI coding tools have permanently raised baseline code output. The rate limiter has shifted to the second half of the software lifecycle: monitoring, debugging, and incident response. Teams are shipping faster than ever — and discovering bugs in production faster than ever.
- 02
Datadog faces an innovator's dilemma it cannot escape. The platform, pricing model, and organizational structure are all optimized for dashboards and manual investigation. Rebuilding for AI would require cannibalizing their core business. They won't.
- 03
Owning the full stack is the moat. Sazabi built its own storage layer, agent, and interfaces. This means it can memorize every incident your system has ever had, optimize query patterns specifically for AI access, and improve from the collective experience of all customers. Competitors sitting on top of Datadog cannot replicate this.
- 04
Sherwood is purpose-built for this specific problem. 12 years in DevOps and observability — Crunchbase, Brex, 11x. Founded Brex's observability team. 2x YC founder with a successful exit. He has been building toward this exact product for his entire career.[7]
Problem
AI solved the first half of software engineering. The second half is still broken.
Teams using Claude Code or Cursor are shipping code 5–10× faster than they were two years ago. The bugs didn't slow down proportionally. If anything, they increased — more code reaching production faster means more surface area for things to go wrong.
The tool most engineering teams reach for when something breaks? Datadog — a company founded in 2010, three years before the first transformer paper. Its product is designed around manual dashboard investigation, complex query languages (PromQL, Datadog's own DSL), and niche expertise. It was an elegant solution for 2010. It feels excruciatingly painful next to Claude Code.
Right now, every engineering team in the world is coming to the same conclusion: it doesn't matter how fast you can write code if your users are constantly running into bugs and your app is constantly going down.[6]
5–10×
Code output increase
With modern AI coding tools
0
Code changes required
To set up Sazabi on 35+ platforms
<15 min
Time to value
From zero to live alerts
Why Now
The market already agrees. Legacy platforms can't adapt.
From Sazabi customers and angel investors — people who have lived inside the largest observability deployments in the world.
Having seen the product myself, I can vouch that it is miles ahead of any o11y product I've used and represents a foundational shift in how observability will be done in the future.

Matthew Lenhard[6]
Tech Lead, AI Gateway · Vercel
The outer loop is the new bottleneck, and software is more unstable than ever. Building on top of legacy platforms limits your ability to innovate. Today's teams demand a new set of opinionated, end-to-end AI tools to move at the speed of creation.
Merrill Lutsky[6]
CEO · Graphite
Can't escape the Sazabi! We've been on the product for a while now and it's awesome, proactively catching errors through our logs and creating fixes. We've merged many Sazabi PRs to Superset.
Kiet Ho[6]
CEO · Superset (P26)
Datadog faces a classic innovator's dilemma — and it's not going to win.
The revenue model. Datadog charges per host, per custom metric, per log ingested, per APM trace. Their enterprise sales motion assumes a dedicated observability team who configures dashboards and writes alert rules for months before getting value. An AI-first product that "just works" in 15 minutes would destroy this model.
The product architecture. Every AI feature Datadog has shipped is stateless — each investigation starts from scratch, with no memory of past incidents, no understanding of how your system has evolved. Bits AI SRE, Datadog's incident-investigation agent, went GA in December 2025[14] and got a deeper-reasoning update in 2026 that doubled its speed and widened its data access.[15] But Bits investigates inside Datadog's existing data model and pricing — it makes the dashboards-and-ingest business stickier rather than replacing it. This isn't a feature gap. It's a fundamental architectural constraint. You can't bolt memory onto a stateless platform.
The organizational structure. Datadog has thousands of engineers building and maintaining dashboards, query languages, and integrations that a truly AI-native product wouldn't need. The company cannot unwind itself to compete.
These companies were built on a set of assumptions that no longer hold true. Everything about them, from their technology to their organizational hierarchies and business models, is structurally misaligned with AI.
How It Works
Three steps. Under 15 minutes. No code changes required.
After setup, it runs itself.
Automatic system map. Sazabi scans your logs and codebase to register all key services, components, and product features. It generates a live status page for your application — any team member can see overall system health and any ongoing incidents in real time.
Intelligent alerting. Background agents monitor your logs, codebase, and infrastructure for anomalies — from unfamiliar errors to traffic spikes to crashed pods and failed deployments. When a legitimate issue is detected, Sazabi sends a rich Slack alert with root cause and suggested fix. Duplicate alerts are automatically suppressed — Sazabi checks every new alert against existing ones before it reaches you.
Multiplayer debugging. Sazabi conversations are shared by default. Your entire team can debug the same incident together in real time — the first truly multiplayer observability platform.[6]
Autonomous fixes. When you're ready to act, Sazabi can open a pull request against your repo. Sazabi recently outperformed Claude Code on TerminalBench 2 — not a benchmark they expected to lead, but a useful signal about the underlying agent quality.
8,000
Background investigations run
Closed alpha · at public launch
2,000
Issues detected
Across 2 TB of logs ingested
200
Pull requests opened
Against customer repos
Closed-alpha traction at the public YC launch — 35 new teams onboarded in the preceding month.[12]
Security & compliance — out of the box
CertificationsEnterprise-grade certifications achieved in the company's first year of operation.
Logs Are All You Need
The most controversial idea behind the product.
Conventional wisdom says observability requires three pillars: logs, metrics, and traces. Sazabi disagrees.
No metrics. No traces. Only logs.
Why it's defensible. "Fundamentally, logs are just events, metrics are aggregated events, and traces are basically correlated events. We only accept logs, and we create metrics and traces from those logs on the back end."[10] Logs, metrics, and traces are not three different data types; they're three different views of the same underlying reality. Sazabi computes the views you need on demand.
Why it produces a better product. Sazabi's storage layer, query patterns, and agent are all optimized for a single data type. The architecture uses materialized views and LM-generated summaries of log windows — "We can take an hour's worth of log data and summarize that into a much smaller package using language models. You only have to query the summary."[10] Logs are also much easier to instrument than metrics or traces — for most teams, getting started means zero code changes.
Why AI makes it possible now. Three years ago, log analysis meant regex and pattern matching. Today, an LLM can read your log stream, understand root causes, correlate incidents across services, and explain exactly what happened in plain English. The "logs are all you need" thesis only holds because AI has transformed what you can do with raw log data.[6]
Lots of engineers are skeptical about this idea, but we're winning them over. If you have doubts about what AI can do with your log stream, I encourage you to try Sazabi and find out. You'll be very impressed.
Market
The highest-density version of their ICP is inside YC right now.
Sazabi's stated ICP: VC-backed tech startup, Seed to Series C, founded in the last three years, 5 to 50 engineers, moving fast with AI tools. This describes every company in the current YC batch — and every company in every future YC batch, indefinitely.
The ICP is also the fastest-growing segment in the tech economy. Every week, another cohort of AI-native startups gets funded and immediately hits the outer loop problem. They didn't grow up with Datadog and have no loyalty to it. They want something that works like Claude Code, not something that works like enterprise software from 2010.
Cloud observability market, 2023–2027E
Chart
Gartner sized cloud observability at $51B in 2023, growing ~11% annually through 2027. 2024–2027 values are derived from that base and CAGR — a path to roughly $77B.
Source · Gartner, via Network World [9]
Every YC company is a software company. Every software company has an observability solution. Sazabi should be that solution. I'll be following in a tradition of great YC companies — Brex, Deel, Rippling — that sold into their batchmates really successfully.
Competitive landscape
Four categories of competition. Sazabi is positioned against all of them.
Each competitor category has a structural limitation. Sazabi's vertical integration is the answer to all four.
Capital is flooding the adjacent categories
Chart
Disclosed rounds in AI-native observability, evals, and AI SRE, February 2025 – April 2026. LangChain's Series B (LangSmith observability) valued it at $1.25B; Braintrust at $800M; Resolve AI at $1B. Langfuse exited to ClickHouse in January 2026 rather than raising.
Source · Arize [21] · Fortune [16] · TechCrunch [20] · SiliconAngle [19] [22] · Resolve AI [18]
The capital flows validate the categories around Sazabi — and leave its position open.
In the fourteen months to April 2026, investors deployed roughly $450M across the adjacent layers: $70M into Arize,[21] $48M into Traversal,[16] $125M into LangChain at $1.25B,[20] $80M into Braintrust at $800M,[19] and $125M into Resolve AI at $1B.[18] Every one of these companies either layers an agent on top of someone else's telemetry or monitors only the AI slice of the stack. The full-replacement position — own the storage, own the agent, own the interface — is the one the money hasn't crowded yet.
The consolidation signal points the same direction. ClickHouse bought Langfuse outright in January 2026 as part of a $400M round at $15B[22] — the observability data layer is becoming strategic infrastructure that database companies acquire rather than partner with. That is precisely the layer Sazabi owns from day one.
The most important differentiator is our vertical integration. We're building every piece of the AI observability solution: the interfaces, the agent, the database. This allows us to do things that competitors fundamentally can't. We're the Apple of observability.
Founder deep dive
Sherwood's entire career was building toward this moment.
Founder & team
Key team members
Risks & mitigations
What we're watching
References
- [1]Sazabi — YC Profile
- [2]Sazabi — Company Website
- [3]Sazabi — LinkedIn
- [4]Sazabi — X/Twitter
- [5]Sazabi — Product Overview (YouTube)
- [6]Sazabi — Launch on Bookface (YC internal, P26)
- [7]Sherwood Callaway — "Round Two" personal blog
- [8]Sherwood Callaway — Founder Interview (YouTube)
- [9]Gartner — Cloud Observability Market ($51B in 2023, 11% CAGR through 2027), via Network World
- [10]Paul Gillin — "Startup Sazabi bets on logs and AI agents to replace traditional observability stacks" (SiliconAngle)
- [11]Datadog Investor Day 2026 — Platform TAM ($30B Observability + $21B Cloud Security = $51B by 2027)
- [12]Launch YC: Sazabi — Datadog for the AI Era (public launch traction)
- [13]Zypsy — "Investing in Sazabi" (February 2026)
- [14]Datadog — "Datadog Launches Bits AI SRE Agent to Resolve Incidents Faster" (GA press release, December 2025)
- [15]Datadog — "Meet the new Bits AI SRE: Deeper reasoning, twice as fast" (2026)
- [16]Fortune — "Traversal emerges from stealth with $48 million from Sequoia and Kleiner Perkins" (June 2025)
- [17]SiliconAngle — "American Express partners with and invests in AI operations startup Traversal" (March 2026)
- [18]Resolve AI — "$125M Series A" at a $1B valuation (April 2026)
- [19]SiliconAngle — "Braintrust lands $80M Series B funding round" at an $800M valuation (February 2026)
- [20]TechCrunch — "Open source agentic startup LangChain hits $1.25B valuation" ($125M Series B, October 2025)
- [21]Arize AI — "$70M Series C" (February 2025)
- [22]SiliconAngle — "Database maker ClickHouse raises $400M, acquires AI observability startup Langfuse" (January 2026)


