Staff Software Engineer

Obsidian Security is the leading SaaS security platform, trusted by global enterprises like Snowflake, T-Mobile, and Algolia. We protect 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. Founded in 2017 and backed by top investors like Greylock, Obsidian was built to close a critical gap: securing SaaS apps where business happens—Microsoft 365, Salesforce, and hundreds more. The company does this by offering a complete SaaS security platform to reduce risk, detect and respond to threats, and prevent breaches at the source. Obsidian was built by leaders who redefined endpoint and identity security at CrowdStrike, Okta, Cylance, and Carbon Black. Now, they’re transforming how SaaS is secured. With AI driving rapid SaaS growth and complexity, agentic AI tools gain privileged access to sensitive data through integrations, creating new risks most security tools miss. Obsidian uniquely detects anomalous OAuth token activity and manages integration risks. Major announcements are on the horizon. Recognizing that SaaS security needs to evolve, Obsidian enables growing organizations to start with a lightweight, prevention-focused browser extension and expand coverage over time. With global momentum, a growing partner ecosystem including SentinelOne, Databricks, and Google Cloud, and a major fundraise ahead, Obsidian is scaling rapidly toward long-term growth and IPO readiness. About Obsidian Security Obsidian helps companies figure out what’s happening in their SaaS applications - who’s accessing what, where data is going, and what looks suspicious. Role Description You’ll work across the full stack on the Threat product team: browser extension code that hooks into web applications, backend services processing millions of events, and data pipelines feeding our detection engine. One day you’re in TypeScript debugging why a content script isn’t capturing form submissions on some vendor’s weird SPA. The next you’re in Python fixing a Kafka consumer that’s falling behind. Sometimes you’re in Rust optimizing a hot path in the telemetry collector. Right now, a big focus is shadow AI - enterprises want to know when employees are pasting sensitive data into ChatGPT, Claude, or whatever new LLM chatbot showed up this week. You’ll build the systems that catch this. What you’ll do Own features from “we need to detect X” through production, across extension, backend, and pipeline code Write content scripts that interact with web pages and background scripts that coordinate everything Build backend services: event ingestion, enrichment, alerting Work with security researchers to turn threat intel into working detections Help the team get better through code review and design discussions What we’re looking for 8+ years building software, ideally touching a few different areas (not just one stack forever) You actually understand how browsers work. DOM APIs, the event loop, how SPAs route, why CORS exists. Not just “I used React.” You’ve built browser extensions before. You know the content script/background script split, message passing, manifest v3 limitations. Strong TypeScript. Comfortable in Python. Willing to write Rust (or already do). You’ve dealt with data at scale: event streaming, pipelines, high-throughput ingestion. Backend basics: APIs, Postgres, Elasticsearch, Kafka or similar. Can work without someone telling you what to do next. Bonus points You’ve thought about AI security - prompt injection, data exfiltration, that kind of thing Background in detection engineering, SIEM, or security ops You’ve built or contributed to security tools 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