Sergey Slashchev

Senior Software Engineer with over a decade at Meta and Microsoft building high-throughput backend platforms and full-stack applications. Architected the infrastructure that opened Meta’s first-party hardware notification systems to third-party developers.

Technical Skills

Programming Languages

  • Kotlin
  • Java
  • Python
  • JavaScript (React/React Native)
  • C#
  • Hack
  • PowerShell

Infrastructure & Cloud

  • AWS
  • Windows Azure
  • Docker
  • Git
  • SQL Server

Core Competencies

  • Android Backend Architecture
  • Performance & Network Optimization
  • High-Throughput Distributed Systems
  • API Design & Integration
  • Sensor Fusion Algorithms
  • Real-Time Data Privacy & Encryption

Experience

Contract Software Engineer

OpenUTM Remote / Contract 2026 · 4 months
  • Engineered a sophisticated drone collision avoidance UTM (Unmanned Traffic Management) system deployed for the Province of Alberta.
  • Developed a real-time sensor fusion algorithm to calculate precise drone positioning from multiple concurrent data streams.
  • Coordinated cross-functional development efforts with AirMarket and University of Calgary faculty to architect and deliver a fully operational collision avoidance system on schedule.
python sensor-fusion real-time-systems

Software Engineer, Horizon

Meta Remote 2024 — 2026
  • Served as the core Android expert for the Meta Horizon app, owning application backend support and acting as a primary contributor during a complete application redesign.
  • Architected robust UI infrastructure to support a completely new application navigation paradigm utilizing dynamic bottom sheets.
  • Spearheaded app startup performance initiatives by building a comprehensive monitoring system, identifying bottlenecks, and validating optimizations through rigorous A/B experimentation.
  • Enhanced overall application reliability by implementing advanced crash-detection mechanisms and crash memory dumps, significantly accelerating the issue debugging process for the engineering team.
kotlin java react-native android

Software Engineer, Notifications

Meta Bellevue, WA 2020 — 2024
  • Engineered a proprietary core Android push notification infrastructure—built as a scalable alternative to FCM—delivering all notifications across Meta applications to over 300 million devices globally.
  • Spearheaded a 0-to-1 platform initiative to port the core notification system to Meta's first-party hardware devices, architecting the backend systems required to enable robust third-party notification support.
  • Enhanced connection security by migrating to a secure, zero-knowledge network handshake protocol and implementing advanced security-hardening features across the core service.
  • Partnered with the Messenger team to redesign the notification architecture, ensuring seamless compatibility and secure data handling for a newly implemented end-to-end (E2E) encryption paradigm.
kotlin java android distributed-systems security

Developer Support Engineer

Meta Ireland 2016 — 2020
  • Executed a hybrid role evenly split between core software engineering and high-tier external developer support, actively troubleshooting complex API and SDK anomalies.
  • Developed and optimized critical developer-facing interfaces, including the Facebook Graph Explorer and bug triage tools, to streamline engagement with the internal support team.
  • Designed an automated, generic data-masking pipeline that intercepted and encrypted plain-text access tokens from developer debug logs in real-time, securing sensitive user data company-wide.
hack react developer-tools security

Service Engineer (Developer Division)

Microsoft Ireland 2014 — 2016
  • Maintained and optimized the sustainability, uptime, and high availability of source control, bug tracking, and build systems corporate-wide.
  • Led a distributed initiative to build an automated service account password reset framework, successfully rolling it out across 700+ production servers with minimal downtime.
  • Accelerated cross-datacenter service migrations by engineering automated deployment and configuration scripts for production environments.
c# powershell infrastructure

Technical Program Manager (Azure Rotation)

Microsoft Ireland 2012 — 2014
  • Selected for a competitive graduate rotation program, executing a high-impact 6-month stint within the core Azure engineering division.
  • Re-engineered automated DNS monitoring systems in Windows Azure, drastically reducing false-positive alerts and reclaiming significant developer engineering cycles.
  • Co-authored the primary technical architecture draft specification for the Azure Customer Domain Hosting Service.
azure monitoring

Education