Staff Site Reliability Engineer in Cheltenham

Founded in 2017, Obsidian Security was created to close a critical gap: securing the Saa S applications where modern business happens—platforms like Microsoft 365, Salesforce, and hundreds more.

Backed by top investors including Greylock, Norwest Venture Partners, and IVP, we’ve built a complete Saa S security platform to reduce risk, detect and respond to threats, and prevent breaches at the source.

Our team includes leaders who helped define the categories of endpoint and identity security at Crowd Strike, Okta, Cylance, and Carbon Black.

Now, we’re transforming how Saa S is secured—in the era of agentic AI.

Today, Obsidian is trusted by global enterprises like Snowflake, T‑Mobile, and Pure Storage.

We protect more than 200 organizations across North America, Europe, the Middle East, Southeast Asia, Australia, and New Zealand—including many of the world’s largest Fortune 1000 and Global 2000 companies.

With strong global momentum, a growing partner ecosystem including Sentinel One, Databricks, and Google Cloud, and a major fundraise on the horizon, we’re scaling quickly toward long‑term growth and IPO readiness.

Join us as we define the future of Saa S security!

Staff Site Reliability Engineer

As a Staff SRE at Obsidian, you will define and drive the company‑wide reliability vision for a complex, multi‑tenant Saa S platform serving enterprise and financial customers.

You will operate as a strategic partner to Dev Ops and Platform Engineering leadership, shaping a unified reliability strategy that scales across the organization.

Your core mandate: ensure Obsidian detects, diagnoses, and communicates system issues before customers are impacted—consistently and predictably.

This is a hands‑on technical role that involves architecting and leading the implementation of systems that handle real‑world complexity, including upstream Saa S dependencies, sparse and noisy signals, and mission‑critical enterprise workloads.

Key Responsibilities

• Reliability Strategy & Architecture – Define and lead long‑term reliability strategy across services.

Establish end‑to‑end system visibility frameworks and guide architecture for observability, detection, and resilience.

• Cross‑Org Leadership – Partner across teams to embed reliability, standardize SLI/SLOs, and serve as a technical escalation expert.
• Detection & Observability – Build intelligent detection systems (anomaly detection, connector health models) and enable self‑service observability.
• Incident Management – Define and evolve a tiered incident communication strategy, improve response practices, and lead postmortems to strengthen reliability and customer trust.
• Execution – Contribute hands‑on to system design, monitoring, and debugging across distributed systems and data pipelines.
• Required Qualifications
• 5+ years in SRE, Production Engineering, or related roles
• 3+ years operating at a senior or technical leadership level (Staff or equivalent scope)

• Deep expertise in

• AWS and/or GCP
• Kubernetes and Helm
• Observability stacks (Prometheus, Grafana, or equivalent)
• CI/CD systems (Git Lab CI/CD, Argo CD, etc.)
• Proven experience designing and scaling reliability systems for multi‑tenant Saa S platforms
• Strong debugging and systems thinking across distributed microservices and legacy systems
• Demonstrated ability to lead initiatives that improve incident detection, response, and system resilience
• Hands‑on engineering approach with a track record of building—not just configuring—reliability systems
• Preferred Qualifications
• Experience in B2B Saa S serving enterprise or financial customers
• Familiarity with third‑party Saa S connector architectures and ingestion patterns
• Experience building anomaly detection or intelligent alerting systems
• Experience designing customer‑facing status pages and incident communication frameworks
• Why This Role
• Drive org‑wide reliability strategy
• Own and build new detection & observability systems
• Tackle complex distributed systems challenges
• Safeguard critical infrastructure for financial customers
• What Success Looks Like
• Issues caught and resolved before customer impact
• Reliability is measurable and continuously improving
• Teams self‑serve observability with scalable tools
• Clear, proactive incident communication builds trust
• Reliability becomes a competitive advantage
• Employee Benefits

Our competitive benefits packages are designed to support our employees' well‑being, both at work and at home.

Our US‑based employees enjoy competitive compensation with equity and 401k, comprehensive healthcare with dental and vision coverage, flexible paid time off and paid holiday time off, 12 weeks of new parent or family leave, and personal and professional development resources.

For more details on our US benefits, or for information on our international benefits, please see here.

Pay Transparency

Please note that the base pay range is a guideline and for candidates who receive an offer, the base pay will vary based on factors such as work location, as well as the knowledge, skills and experience of the candidate.

In addition to a competitive base salary, this position is eligible for equity awards and may be eligible for sales commission or incentive compensation based on the role or function within the company.

Base Salary Range: £124,000 GBP – £141,000 GBP

At Obsidian, we are proud to be an equal‑opportunity employer.

We value diversity and hire for talent, passion, and compassion.

In compliance with federal law, all persons hired will be required to submit satisfactory proof of identity and legal authorization.

If you have a need that requires accommodation, please contact accommodations@obsidiansecurity. com.

Information collected and processed as part of any job applications you choose to submit is subject to Obsidian’s Applicant Privacy Policy.

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