Grzegorz (Greg)
Lapinski

Principal Software Engineer · Performance Engineering

20+ years building, debugging, and optimizing enterprise systems at Microsoft and Salesforce. From SQL Server engine internals to cloud-scale distributed architecture.

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Greg Lapinski
About

Building enterprise software
for over two decades

Principal Software Engineer and technical lead specializing in database engine internals, runtime integration, and performance optimization at scale.

Led cross-org initiatives at Microsoft and Salesforce spanning multiple platform teams and product releases. Mentor and technical leader for engineering teams in low-level debugging, systems programming, and algorithm design.

Experience

Where I've worked

Aug 2021 — Present

Principal Backend Software Engineer

Salesforce · Bellevue, WA
  • Stabilized AsyncAPI processing pipeline — reduced noisy-neighbor incidents by 99% and decreased SQL Server resource utilization by 75%
  • Optimized AsyncAPI queueing internals — doubled request throughput and reduced processing latency 4x, enabling millions of enqueued requests to be processed efficiently
  • Designed automated throttling algorithm using probabilistic programming and surrogate models for fair resource sharing across concurrent workloads
  • Led migration of Salesforce Marketing Cloud from legacy .NET Framework to .NET 8 — ported the majority of initial projects, established patterns and infrastructure, developed AI-assisted tooling for remaining conversions
  • Mentored engineers across teams in managed code debugging, SQL Server performance tuning, and production incident analysis
C# .NET 8 SQL Server WinDbg
Oct 2013 — Aug 2021

Principal Software Engineer

Microsoft Corporation · SQL Server · Redmond, WA
C++ C# .NET Core gRPC WPF WinDbg
May 2009 — Oct 2013

Software Engineer in Test

Microsoft Corporation · Azure Networking · Dublin, Ireland → Redmond, WA
  • Designed test architecture for Azure DNS service. Developed RCES — a remote code execution and code injection framework for distributed testing and fault injection in heterogeneous environments
  • Designed and implemented deployment service for PaaS and IaaS tenants. Created Remote Cluster Repository test framework
  • Designed and implemented code coverage collection for SLB (Software Load Balancer)
C# WCF WinDbg Detour
May 2008 — May 2009

Software Engineer

Microsoft Corporation · Windows Phone 7 · Dublin, Ireland
  • Implemented network traffic monitoring and cost estimation engine for Windows Phone data plan management, including NDIS driver-level components
C++ NDIS LWF Windows Mobile
Jun 2007 — May 2008

Software Engineer

EMCC Software Ltd · Manchester, UK
  • Developed BlackBerry push email client for Sony Ericsson mobile phones
C++ Symbian SDK UIQ 3.0
Jul 2005 — May 2007

Software Engineer

Ideal Host Poland · Gdansk, Poland
  • Architected and led development of a line-of-business system for the UK Joint Industry Board for Plumbers
C# .NET Windows Forms SQL Server
Jan 2004 — Jul 2005

Co-Founder

Axiom Software · Gdansk, Poland
  • Built and shipped a sales management platform end-to-end — from architecture through sales and marketing — deployed to several food distribution companies with full ERP integration
C++ C# .NET SQL Server SQL Server CE
Aug 2001 — Dec 2003

Software Developer

IVO Software (now Amazon Text to Speech) · Gdansk, Poland
  • Ported the voice synthesizer (Polish language) to Symbian platform S60, implemented audio streaming
  • Designed and implemented UniSpeaker, an accessibility application for visually impaired users
C++ COM x86 ASM
Open Source

Projects

Optimization
Agos.jl — Surrogate-based optimization framework (Gaussian Processes, SVMs, XGBoost)
Julia
Systems
Starfish — High-performance async I/O runtime with lock-free data structures
Rust
Networking
OpenSSL.jl (official Julia package) · Nghttp2.jl · gRPC.jl
Julia
Skills

Technical expertise

Languages

  • C# (.NET Framework, .NET 8)
  • C / C++
  • Julia
  • Rust
  • x86 Assembly

Databases

  • SQL Server (engine internals)
  • Performance tuning
  • Big Data Clusters
  • SqlCLR runtime integration

Systems & Cloud

  • Microsoft Azure
  • Distributed systems
  • gRPC / WCF
  • Linux porting (namespaces, cgroups)

Debugging & Tools

  • WinDbg (advanced)
  • Managed code debugging
  • Performance profiling
  • PDB-based code generation
Education

Academic background

1998 — 2003

M.S. in Computer Science and Engineering

Gdansk University of Technology · Gdansk, Poland
  • M.S. and B.S. in Computer Science
  • Minor: Biomedical Engineering
  • Thesis: "EEG analysis using wavelets transform"
Contact

Get in touch

Interested in discussing opportunities, technical challenges, or collaboration.

Email
grzegorz.lapinski@live.com
Phone
(425) 761-0329
LinkedIn
grzegorz-lapinski
GitHub
@grlap