Dan Sullivan – Resume

Dan Sullivan résuméDANSULLIVANTennessee, USA(312) 607-3702resume@a2f0.netEXPERIENCECOOFeb 2022 - Dec 2025-Thinkspan-RemoteBuilt a configuration driven end-to-end encrypted everything app with private AI.Wrote a zero-knowledge CRDT for a proprietary distributed graph database.Engineered and implemented a session-based differential cache synchronization protocol.Product BuilderApr 2021 - Jan 2022-Command Snippets-RemoteCreated a note-taking system for computer programmers and system administrators.VP of EngineeringAug 2017 - Apr 2021-Real Time Risk Solutions-Chicago, USAAdvanced from a part-time contractor to leading an engineering team building a risk managementproduct being used by Fortune 500 companies.Addressed attribute-level merge collisions for a distributed asynchronous write cache.Coded abstract constructs to enforce a flexible multidimensional REST security model.DevOps Engineer (Contract)Sep 2017 - Sep 2020-Ball Horticultural Company-Chicago, USACompleted extensive application performance profiling to identify bottlenecks and made changes tooptimize hardware utilization and response times for deeply-nested/polymorphic data structures.Automated code signing and release automation of iOS, Android, and Rails applications.IoT Engineer (Contract)Aug 2017 - Aug 2019-Aker (acquired by IntelinAir)-Chicago, USAEngineered a sensor polling subsystem and cluster manager for data aggregation through a hybridmicrocontroller SBC fabric. Completed extensive TX/RX serial, I2C, and GPIO programming.Built an LTE cellular connection manager and IP route governor for redundant network uplinks.Created a web-based wpa_supplicant wrapper to facilitate user-configurable 802.11 parameters.Identified unusable imaging captures by building a serverless blur detection workflow.Wrote a hardware driver for a CDM7160 CO2 module.Coded an NMEA stream parser and assembled Exif embedded geolocated sensor output.Senior Systems AdministratorJun 2011 - May 2017-The Center for Research Informatics-Chicago, USAGreenfielded a multimillion dollar research computing environment (NIST SP 800-53 compliant).Implemented an HPC-integrated bioinformatics tool pipelining platform (Galaxy, Torque). Built anAPI integration to ensure POSIX ACL parity with web libraries.Developed a customer-facing metered cloud billing system including client invoicing, mainframetransaction processing, roll-up reporting, subsidization tracking, and asset lifecycle initiation (Rails).Wrote a provisioning tool for synchronizing IAM objects between Internet2 Grouper, CentrifyDirectControl, and Isilon OneFS. Achieved global UID/GID to SID coherency.Security EngineerApr 2006 - Jun 2011-The University of Chicago-Chicago, USAIdentified point in time ownership of L4 NAT sessions by designing a common information model,metadata abstraction schema, and correlation logic for billions of unstructured events (Splunk).Authored a multi-user GnuPG wrapper to facilitate granular access control to encrypted files.Performed Expect.pm automation against an IP network comprised of 2000+ programmable assets.Implemented cross-platform PKI authenticated IPsec. Achieved proficiency in IKE debugging.Deployed a vendor-neutral network ACL management and provisioning platform.IT ManagerAug 1996 - Apr 2006-Telephone Dictation Services-Chicago, USAManaged ~50 remote DOS sites via modems using PCAnywhere.EDUCATIONThe University of ChicagoMaster of Computer ScienceThe University of IowaBachelor of Business Administration (Management Information Systems)WEBPRESENCESa2f0.nettearleads.comdevopsrockstars.comgithub.com/a2f0linkedin.com/in/a2f0