Professional experience

Some engagements overlapped, as noted in the original resume.

Principal Software Engineer

Microsoft Corporation · October 2016 – Present

Skype for Business, Skype, and Microsoft Teams

Modernized authentication and authorization across services, replacing legacy components with fail-safe designs and enabling multiprotocol identity integration, identity federation, and consistent access-control practices.
Implemented secure-by-default service practices as part of a corporation-wide initiative to eliminate high-privilege access. Applied least privilege, service security, privacy compliance, monitoring, and security-review practices across eight services.
Contributed to media-services modernization for real-time communications, designing and implementing highly available Teams call processing and forwarding with interoperability across services and platforms.
Prepared service infrastructure for AI-ready integration by modernizing platform foundations, service interfaces, and distributed diagnostics to support reliable, scalable integration of new capabilities.
Contributed to .NET Framework-to-.NET Core migration, Teams infrastructure, and server-to-server latency improvements across distributed services.
Participated in on-call rotations and live-site incident response, troubleshooting production issues, coordinating service recovery, and following through on reliability improvements.
Promoted maintainable engineering practices through design guidance, documentation, and thorough code reviews.

XIM Inc. for Anomali Inc. · July 2016 – October 2016

Online network-activity analysis system

Led improvements to system design, build, and deployment; developed log collection, service monitoring, recovery, failover, and fast-startup features.
Reduced deployment time from 20 minutes to 5 with a GNU Make-based build and deployment process, and introduced continuous integration.

XIM Inc. for Satellite Healthcare · February 2015 – June 2016

Medical application development

Led and mentored a team of eight, contributing to application design, feature delivery, issue resolution, and deployment.
Supported Scrum planning and estimation, an ITIL process migration, and work toward Electronic Health Record Meaningful Use Certification.

Zaochnik Inc. · September 2014 – February 2015

Student collaboration and tutoring platform

Planned features with Scrum and developed online chat and real-time email notifications.
Reworked internal infrastructure, including a virtual-machine cluster, backup workflows, and networked proxies.

XIM Inc. / Infotechnology LLC · April 2010 – February 2015

Led technical planning, resource allocation, reporting, project management, and engineering decisions.
Architected and built cloud-based Python platforms and commercial web products; trained students in Java, C/C++, and Python development.

XIM Inc. / Infotechnology LLC · April 2007 – April 2010

Contributed to internal and client projects across web applications, enterprise systems, mobile software, and telecommunications.

MPOVT JSC · August 2005 – April 2010

Developed software for telecommunications equipment, including switching engines, multiplexers, routers, embedded systems, and real-time billing.

Military service · January 2006 – January 2007