Sean Bell

Sr SWE @ ServiceNow

San Diego Metropolitan Area

About

Driven engineer with a strong backend foundation and track record of successful deployments, now focused on contributing to safe and aligned AI. Actively self-learning alignment, interpretability, and ML systems to pivot into roles that prioritize responsible AI development. Committed to building with both technical rigor and long-term safety in mind.

Experience

  • Senior Software Engineer at ServiceNow
    Apr 2026 - Present · 3 mos

  • Forward Deployed Engineer at Aisera
    Nov 2025 - Apr 2026 · 6 mos

    • Deployed AI-driven automation for Fortune 500 enterprise clients, integrating identity providers and modeling complex IT/HR workflows via REST APIs, owning the full onboarding lifecycle from solution discovery through production deployment • Instrumented customer-specific LLM behavior by tuning model outputs based on workflow context, historical interactions, and preference signals, improving resolution rates on live customer environments • Designed and deployed production integrations connecting Aisera's AI platform to a wide range of enterprise systems, spanning ITSM platforms, cloud services, identity providers, and productivity suites

  • ServiceNow (7 yrs 5 mos)
    • Senior Software Engineer
      Feb 2023 - Oct 2025 · 2 yrs 9 mos

      • Led a multi-year initiative to design and implement ECMAScript module support within the ServiceNow scripting ecosystem, enabling integration with third-party npm packages and improving developer ergonomics • Defined a long-term strategy for provisioning and recycling developer sandboxes to safeguard customer data and ensure AI agents can safely execute tasks without unintended modifications • Refactored developer sandbox provisioning to use a queued execution model, throttling concurrent operations and routing jobs to less-loaded nodes to prevent database thrashing and node outages • Redesigned sandbox security for Script Includes to ensure deliberate access and reduce security vulnerabilities, all while preserving complete backward compatibility for existing ServiceNow customers • Implemented per-script configuration support, enabling scripts to run with the latest ECMAScript features, allowing modernization of legacy scripts without breaking compatibility • Remediated multiple critical vulnerabilities in the ServiceNow scripting runtime, safeguarding customer data against potential exfiltration

    • Software Engineer
      Dec 2019 - Feb 2023 · 3 yrs 3 mos

      • Modernized the Rhino scripting engine by upgrading from ES5 (2009) to ES12 (2021), ensuring 100% backward compatibility through conditional transpilation and a custom polyfill bundle • Created an internal test harness to run TC39 Ecma-262 compliance tests, generating compatibility reports and facilitating confidence in language feature rollouts • Built a transpiler cache mechanism by enhancing compiler caching logic, resulting in script execution speed improvements of up to 99% with no memory overhead • Implemented lazy loading for UX data resources via GraphQL transport migration, reducing frontend resource payloads and improving user performance • Developed enhancements to ServiceNow’s application installation and upgrade processes, improving efficiency and reliability for customers

    • Associate Software Engineer
      Jan 2019 - Dec 2019 · 1 yr

      • Created the "Instance Diff Engine", a tool to compare metadata and update-synch tables between two ServiceNow instances and create a report of the differences between them. • Worked on Github integration with ServiceNow's "App Engine", allowing customers to link their applications to different branches in the same repository.