Senior Security Engineer

Responsibilities

- Build and operate the Security Observability & Data Platform (tens of TB/month and growing). This covers ingestion, normalization and retention, plus the query and detection layer on top. Detections are code: tested, reviewed, and measured for precision.

- Own endpoint security across the fleet: deploy, tune and respond with EDR; run and configure binary authorization; and set hardening baselines with IT Operations.

- Lead threat hunting, internal investigations and insider-threat work. Handle security incidents end to end: triage, containment, forensics, root cause, and the control that prevents a repeat.

- Build the next generation of security services and run them in production: zero-trust AuthN/AuthZ, a uniform blocking service, an application proxy, asset inventory, developer portal, and compliance as code.

- Build and run the agent platform (local and Kubernetes). Use LLM agents to automate triage, enrichment, investigation and response, with deterministic checks wherever a model's answer isn't enough.

- Review infrastructure and cloud designs (Kubernetes, AWS/GCP, bare metal, CI runners) for security, and help engineering teams adopt the shared services instead of building their own.

- Run red-team and adversary-emulation exercises, and turn the results into detections and fixes.

- Write runbooks and post-mortems that someone who wasn't in the room can follow at 3 a.m.

Minimum Qualifications

- Bachelor's degree in Computer Science, Computer Engineering, a relevant technical field, or equivalent practical experience.

- 5+ years in security engineering, detection and response, or infrastructure/SRE with a security focus, including hands-on incident response on endpoints and in the cloud.

- Experience operating an EDR, writing and tuning detections. Knowledge of macOS and Linux internals as attackers use them: persistence, credential theft, process injection, living-off-the-land binaries.

- Experience building or operating telemetry pipelines and a SIEM or security data lake at TB scale. Strong SQL, including detection logic over large datasets.

- Hands-on production engineering: Linux, containers, Kubernetes, at least one major public cloud, infrastructure as code, monitoring and alerting.

- Proficiency in Python or Go, and comfort with Rust or willingness to work in it (most of Mysten's stack are Rust).

- Working knowledge of identity: SSO (OIDC/SAML), phishing-resistant MFA, device trust, and how session and token theft work.

- Strong written communication: can run an incident channel and write the post-mortem.

- Interest in the web3 space is required.

Preferred Qualifications

- Experience building zero-trust access, identity-aware proxies or policy engines.

- Binary authorization or allowlisting at fleet scale

- Familiarity with the threat actors that target crypto companies and their methods, from social engineering and fake campaigns to supply chain compromises.

- Digital forensics (memory, disk, macOS unified logs) and malware analysis.

- Experience building security tooling with LLM agents (Claude Code skills or comparable), and a clear sense of where models help and where deterministic tooling has to do the work.

- Compliance as code (CIS benchmarks); experience in ISO 27001 or SOC 2 environments.

- Publications, conference talks or open-source security tooling.