firecracker-microvm/firecracker
May 2023 – Jun 2026
22 Months active
Languages Used
PythonMarkdownRustAssemblyCDockerfileShellTOML
Technical Skills
PythonmicroservicestestingvirtualizationBuild System ConfigurationCI/CD
Egor Lazarchuk
PROFILE
Egor Lazarchuk
Worked extensively on the firecracker-microvm/firecracker repository, delivering virtualization features, performance optimizations, and reliability improvements across 22 months. Focused on low-level systems programming, this work included refactoring core modules, enhancing device management, and expanding ARM and x86_64 support. Leveraged Rust and Python to implement robust CI/CD pipelines, improve memory management, and introduce advanced testing frameworks. Addressed security by hardening seccomp filters and improving error handling, while also streamlining artifact management and documentation. The technical approach emphasized modular design, maintainability, and test coverage, resulting in a more stable, performant, and developer-friendly virtualization platform suitable for production workloads.
Overall Statistics
Feature vs Bugs
85%Features
Repository Contributions
264Total
Bugs
20
Commits
264
Features
112
Lines of code
25,496
Activity Months22
Your Network
76 peopleSame Organization
@amazon.co.uk31
ahmarsuhailMember
Alessandro PassaroMember
Anthony Pounds-CornishMember
Hanno BeckerMember
Saumya BhatnagarMember
Burak VarlıMember
Ethan BunceMember
Elphas ToringepiMember
Georgii RylovMember
Work History
June 2026
5 Commits • 2 Features
Jun 1, 2026June 2026 monthly summary for the firecracker repository (firecracker-microvm/firecracker).
5 Commits • 2 Features
Jun 1, 2026June 2026 monthly summary for the firecracker repository (firecracker-microvm/firecracker).
June 2026
May 2026
11 Commits • 4 Features
May 1, 2026May 2026 monthly summary for the firecracker-microvm/firecracker repository. Focused on simplifying VMM memory management, hardening VM shutdown paths, enhancing RNG handling for aarch64, and improving FDT testing. Deliveries emphasize maintainability, reliability, and performance readiness with clear business value for faster boot, more robust hot-unplug behavior, and leaner code paths.
May 2026
11 Commits • 4 Features
May 1, 2026May 2026 monthly summary for the firecracker-microvm/firecracker repository. Focused on simplifying VMM memory management, hardening VM shutdown paths, enhancing RNG handling for aarch64, and improving FDT testing. Deliveries emphasize maintainability, reliability, and performance readiness with clear business value for faster boot, more robust hot-unplug behavior, and leaner code paths.
April 2026
15 Commits • 6 Features
Apr 1, 2026April 2026 focused on modular PCI BAR management, targeted I/O control for virtio-pmem, snapshot safety for vhost-user devices, and stability improvements across KVM interactions and tests. The work delivered a more maintainable PCI handling model, safer guest resource preservation, and a smaller binary footprint, enabling more predictable deployments and easier future VFIO/PMEM extensions.
15 Commits • 6 Features
Apr 1, 2026April 2026 focused on modular PCI BAR management, targeted I/O control for virtio-pmem, snapshot safety for vhost-user devices, and stability improvements across KVM interactions and tests. The work delivered a more maintainable PCI handling model, safer guest resource preservation, and a smaller binary footprint, enabling more predictable deployments and easier future VFIO/PMEM extensions.
April 2026
March 2026
18 Commits • 2 Features
Mar 1, 2026March 2026 highlights across firecracker: delivered a major PCI refactor consolidating PCI handling into the core VMM crate; standardized BDF handling as PciSBDF with smaller, safer types; eliminated dead code and unused traits; moved pci/mod.rs into vmm/pci for better locality and maintainability. In parallel, PMEM and memory management enhancements improved reliability and performance: host page size retrieval hardened (host_page_size), msync caching implemented to amortize MSYNC work, and strict validation for head/status descriptor lengths. Documentation updates cover rate-limiter usage and changelog notes for visibility. Overall, these changes reduce risk, improve safety and performance, and establish a clearer, safer API surface for future work.
March 2026
18 Commits • 2 Features
Mar 1, 2026March 2026 highlights across firecracker: delivered a major PCI refactor consolidating PCI handling into the core VMM crate; standardized BDF handling as PciSBDF with smaller, safer types; eliminated dead code and unused traits; moved pci/mod.rs into vmm/pci for better locality and maintainability. In parallel, PMEM and memory management enhancements improved reliability and performance: host page size retrieval hardened (host_page_size), msync caching implemented to amortize MSYNC work, and strict validation for head/status descriptor lengths. Documentation updates cover rate-limiter usage and changelog notes for visibility. Overall, these changes reduce risk, improve safety and performance, and establish a clearer, safer API surface for future work.
February 2026
10 Commits • 4 Features
Feb 1, 2026February 2026 monthly summary for firecracker-microvm/firecracker focused on reliability, performance, and maintainability improvements. Delivered a KVM stability and locking overhaul to centralize KVM loading logic, reduce race conditions, and stabilize CI; fixed FIFO read-access issues and ENXIO initialization errors; implemented MMDS token handling performance optimization via zerocopy for faster direct base64 conversion on aarch64; performed codebase cleanup and stabilized test logging; and added Dependabot Rust version tracking to improve dependency maintenance.
10 Commits • 4 Features
Feb 1, 2026February 2026 monthly summary for firecracker-microvm/firecracker focused on reliability, performance, and maintainability improvements. Delivered a KVM stability and locking overhaul to centralize KVM loading logic, reduce race conditions, and stabilize CI; fixed FIFO read-access issues and ENXIO initialization errors; implemented MMDS token handling performance optimization via zerocopy for faster direct base64 conversion on aarch64; performed codebase cleanup and stabilized test logging; and added Dependabot Rust version tracking to improve dependency maintenance.
February 2026
January 2026
12 Commits • 5 Features
Jan 1, 2026January 2026 performance summary for firecracker-microvm/firecracker: Delivered key features to improve testing reliability, hardened security controls, refreshed toolchains, and reduced log noise, aligning development and CI with security and performance goals. Notable work includes devtool artifacts management, jailer copy hardening, seccomp filter updates, and CI/toolchain modernization, complemented by targeted fixes to artifact path resolution and CI security checks. These changes deliver faster, more reliable test feedback, stronger security posture, and smoother developer experience.
January 2026
12 Commits • 5 Features
Jan 1, 2026January 2026 performance summary for firecracker-microvm/firecracker: Delivered key features to improve testing reliability, hardened security controls, refreshed toolchains, and reduced log noise, aligning development and CI with security and performance goals. Notable work includes devtool artifacts management, jailer copy hardening, seccomp filter updates, and CI/toolchain modernization, complemented by targeted fixes to artifact path resolution and CI security checks. These changes deliver faster, more reliable test feedback, stronger security posture, and smoother developer experience.
December 2025
21 Commits • 16 Features
Dec 1, 2025December 2025 monthly summary for firecracker project: Delivered core Virtio device lifecycle enhancements, fuzzing readiness, and artifact/development tooling improvements that collectively boost reliability, test coverage, and deployment workflows. Implemented resource cleanup for Virtio PMEM to prevent memory exhaustion in fuzz runs; exposed fuzz-friendly queue handling and added kick implementations to wake/process events; introduced safer device typing and identification via VirtioDeviceType enum and id() method; consolidated and refactored kick behavior across virtio devices for consistency; extended artifact management and devtool automation to support multiple artifacts and streamlined artifact setup. These changes strengthen stability, enable safer fuzz testing, and accelerate CI/CD feedback loops.
21 Commits • 16 Features
Dec 1, 2025December 2025 monthly summary for firecracker project: Delivered core Virtio device lifecycle enhancements, fuzzing readiness, and artifact/development tooling improvements that collectively boost reliability, test coverage, and deployment workflows. Implemented resource cleanup for Virtio PMEM to prevent memory exhaustion in fuzz runs; exposed fuzz-friendly queue handling and added kick implementations to wake/process events; introduced safer device typing and identification via VirtioDeviceType enum and id() method; consolidated and refactored kick behavior across virtio devices for consistency; extended artifact management and devtool automation to support multiple artifacts and streamlined artifact setup. These changes strengthen stability, enable safer fuzz testing, and accelerate CI/CD feedback loops.
December 2025
November 2025
10 Commits • 4 Features
Nov 1, 2025November 2025 performance-focused delivery for the firecracker project: improved reliability and clarity of performance testing and virtualization, with added visualization and CI improvements, plus MSR and memory management enhancements in the virtualization stack. These changes accelerate performance validation, reduce flaky results, and enable independent evaluation of memory overhead and boot time.
November 2025
10 Commits • 4 Features
Nov 1, 2025November 2025 performance-focused delivery for the firecracker project: improved reliability and clarity of performance testing and virtualization, with added visualization and CI improvements, plus MSR and memory management enhancements in the virtualization stack. These changes accelerate performance validation, reduce flaky results, and enable independent evaluation of memory overhead and boot time.
October 2025
16 Commits • 4 Features
Oct 1, 2025Month 2025-10 — Concise monthly summary for firecracker repository focused on delivering virtualization features, improving testing rigor, and hardening the device management surface. Highlights include Virtio-pmem support in the VMM with per-device KVM slot management, centralized Virtio device testing, and modernization of AB testing tooling. Also completed meaningful refactoring to improve reliability and maintenance, with a safety-first approach to error handling and device downcasting. Technologies demonstrated include Rust-based VMM components, KVM memory slot management, Virtio device abstractions, Python-based AB testing tooling, and robust testing patterns.
16 Commits • 4 Features
Oct 1, 2025Month 2025-10 — Concise monthly summary for firecracker repository focused on delivering virtualization features, improving testing rigor, and hardening the device management surface. Highlights include Virtio-pmem support in the VMM with per-device KVM slot management, centralized Virtio device testing, and modernization of AB testing tooling. Also completed meaningful refactoring to improve reliability and maintenance, with a safety-first approach to error handling and device downcasting. Technologies demonstrated include Rust-based VMM components, KVM memory slot management, Virtio device abstractions, Python-based AB testing tooling, and robust testing patterns.
October 2025
September 2025
28 Commits • 13 Features
Sep 1, 2025September 2025 highlights across the Firecracker repository. Key features delivered include substantial VCPU/GDB refactors, Virtio-PMEM core enhancements (snapshot support, VmResources integration, device configs, and metrics), API surface improvements for Virtio-PMEM (API parsing and documentation), PCI fixture readability improvements for enable/disable, and allocator support for past 64-bit memory regions. Major bugs fixed include PCI device reset status being correctly set to 0 on reset and a reduction in test flakiness by avoiding iperf reuse in guest and host tests. Overall, these changes improve reliability, performance readiness, and API clarity, while demonstrating strong Rust refactors, test modernization, API parsing, seccomp updates, and metrics instrumentation.
September 2025
28 Commits • 13 Features
Sep 1, 2025September 2025 highlights across the Firecracker repository. Key features delivered include substantial VCPU/GDB refactors, Virtio-PMEM core enhancements (snapshot support, VmResources integration, device configs, and metrics), API surface improvements for Virtio-PMEM (API parsing and documentation), PCI fixture readability improvements for enable/disable, and allocator support for past 64-bit memory regions. Major bugs fixed include PCI device reset status being correctly set to 0 on reset and a reduction in test flakiness by avoiding iperf reuse in guest and host tests. Overall, these changes improve reliability, performance readiness, and API clarity, while demonstrating strong Rust refactors, test modernization, API parsing, seccomp updates, and metrics instrumentation.
August 2025
4 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary focused on comprehensive documentation improvements for the Firecracker User Guide, consolidating guidance around jailer performance, network interface naming, and formatting style, plus cleanup of redundant notes. These efforts enhance developer onboarding, reduce support burden, and improve overall usability without affecting runtime performance.
4 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary focused on comprehensive documentation improvements for the Firecracker User Guide, consolidating guidance around jailer performance, network interface naming, and formatting style, plus cleanup of redundant notes. These efforts enhance developer onboarding, reduce support burden, and improve overall usability without affecting runtime performance.
August 2025
July 2025
4 Commits • 2 Features
Jul 1, 2025July 2025 performance highlights for firecracker-microvm/firecracker focused on observability, safety, and test reliability. Delivered two features that enhance performance analysis and two fixes that strengthen correctness and test coverage, contributing to more reliable performance baselines and lower risk in production."
July 2025
4 Commits • 2 Features
Jul 1, 2025July 2025 performance highlights for firecracker-microvm/firecracker focused on observability, safety, and test reliability. Delivered two features that enhance performance analysis and two fixes that strengthen correctness and test coverage, contributing to more reliable performance baselines and lower risk in production."
June 2025
21 Commits • 16 Features
Jun 1, 2025June 2025 — Firecracker (firecracker-microvm/firecracker) delivered focused improvements in MSR measurement accuracy, test coverage, runtime stability, and jailer performance validation. The work enhances measurement reliability, reduces failure modes during baseline upgrades, and supports data-driven performance planning. Highlights include: - Key features delivered: • MSR Baseline Updates for m7i (baseline refreshed; commits include chore: update msr baselines for m7i). • Read MSRs in Tests (C tests enhanced to read MSRs). • CPU Baseline Update (cpu template baselines refreshed). • Jailer: remove requirement for an executable name (config flexibility and reduced setup risk). • Jailer: Add performance test (throughput/latency validation). • Jailer_time binary: Add for jailer performance tests (instrumentation for perf measurements). • Release policy and changelog updates to align with 1.12.1 notes. - Major bugs fixed: • MSR Baseline Hex Formatting Fix (resolve formatting edge cases). • Correct MSR Reader Binary (explicitly specify correct msr_reader binary). • Notify Guest: Only Notify Once (corrects duplicate notifications). • UFFD Example Compile Warning Fix (reduce build warnings). • Jailer: Fix panic when errors occur (stability improvements). - Overall impact and accomplishments: • Increased MSR baseline accuracy and test coverage, enabling safer baseline upgrades and reliable performance analysis. • Improved runtime reliability through targeted refactors in Vcpu TLS init, signal handling, and lifecycle (init, drop). • Established a formal jailer performance testing regime and supporting tooling, enabling capacity planning and regression detection. • Improved release readiness via policy updates and changelog maintenance. - Technologies/skills demonstrated: • Rust and systems programming patterns (refactors: Queue, Vcpu TLS, signal handlers, Run-on-thread-local integration). • Low-level measurement and tooling (MSR handling, msr_reader, uffd warnings). • Test engineering (C tests for MSRs), performance testing (jailer perf tests), and release management.
21 Commits • 16 Features
Jun 1, 2025June 2025 — Firecracker (firecracker-microvm/firecracker) delivered focused improvements in MSR measurement accuracy, test coverage, runtime stability, and jailer performance validation. The work enhances measurement reliability, reduces failure modes during baseline upgrades, and supports data-driven performance planning. Highlights include: - Key features delivered: • MSR Baseline Updates for m7i (baseline refreshed; commits include chore: update msr baselines for m7i). • Read MSRs in Tests (C tests enhanced to read MSRs). • CPU Baseline Update (cpu template baselines refreshed). • Jailer: remove requirement for an executable name (config flexibility and reduced setup risk). • Jailer: Add performance test (throughput/latency validation). • Jailer_time binary: Add for jailer performance tests (instrumentation for perf measurements). • Release policy and changelog updates to align with 1.12.1 notes. - Major bugs fixed: • MSR Baseline Hex Formatting Fix (resolve formatting edge cases). • Correct MSR Reader Binary (explicitly specify correct msr_reader binary). • Notify Guest: Only Notify Once (corrects duplicate notifications). • UFFD Example Compile Warning Fix (reduce build warnings). • Jailer: Fix panic when errors occur (stability improvements). - Overall impact and accomplishments: • Increased MSR baseline accuracy and test coverage, enabling safer baseline upgrades and reliable performance analysis. • Improved runtime reliability through targeted refactors in Vcpu TLS init, signal handling, and lifecycle (init, drop). • Established a formal jailer performance testing regime and supporting tooling, enabling capacity planning and regression detection. • Improved release readiness via policy updates and changelog maintenance. - Technologies/skills demonstrated: • Rust and systems programming patterns (refactors: Queue, Vcpu TLS, signal handlers, Run-on-thread-local integration). • Low-level measurement and tooling (MSR handling, msr_reader, uffd warnings). • Test engineering (C tests for MSRs), performance testing (jailer perf tests), and release management.
June 2025
May 2025
16 Commits • 4 Features
May 1, 2025May 2025 monthly summary for firecracker repository focused on CI reliability, data visibility, and maintainability improvements. Delivered centralized CI test data persistence and per-run metrics, enhanced artifact handling and parallelization in Buildkite, isolated A/B test results by run, strengthened code quality and documentation, and fixed a capacity bug impacting IovDeque usage with larger page sizes.
May 2025
16 Commits • 4 Features
May 1, 2025May 2025 monthly summary for firecracker repository focused on CI reliability, data visibility, and maintainability improvements. Delivered centralized CI test data persistence and per-run metrics, enhanced artifact handling and parallelization in Buildkite, isolated A/B test results by run, strengthened code quality and documentation, and fixed a capacity bug impacting IovDeque usage with larger page sizes.
April 2025
11 Commits • 5 Features
Apr 1, 2025April 2025 monthly summary for firecracker-microvm/firecracker focusing on delivering features, stabilizing tests, and expanding hardware coverage for improved business value and performance insights.
11 Commits • 5 Features
Apr 1, 2025April 2025 monthly summary for firecracker-microvm/firecracker focusing on delivering features, stabilizing tests, and expanding hardware coverage for improved business value and performance insights.
April 2025
March 2025
23 Commits • 7 Features
Mar 1, 2025March 2025 monthly summary for firecracker-microvm/firecracker. Significant architectural and module-level improvements were delivered to improve maintainability, testability, and platform readiness. Work spanned jailer module refactors, modularization of initrd and kernel loading, template-driven G4 CPU support, and overarching boot/config architecture refinements, complemented by test infrastructure upgrades and documentation adjustments to raise release confidence.
March 2025
23 Commits • 7 Features
Mar 1, 2025March 2025 monthly summary for firecracker-microvm/firecracker. Significant architectural and module-level improvements were delivered to improve maintainability, testability, and platform readiness. Work spanned jailer module refactors, modularization of initrd and kernel loading, template-driven G4 CPU support, and overarching boot/config architecture refinements, complemented by test infrastructure upgrades and documentation adjustments to raise release confidence.
February 2025
4 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for firecracker-microvm/firecracker. Focused on delivering core ARM/Graviton support and improving configuration safety to enable scalable, high-performance workloads on Graviton-based deployments.
4 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for firecracker-microvm/firecracker. Focused on delivering core ARM/Graviton support and improving configuration safety to enable scalable, high-performance workloads on Graviton-based deployments.
February 2025
January 2025
10 Commits • 6 Features
Jan 1, 20252025-01 monthly summary: Delivered security and reliability improvements for Firecracker with aarch64-focused enhancements, refactors, and developer-experience upgrades. Key items include implementing reset of CNTPER/physical counter on VM boot when KVM_CAP_COUNTER_OFFSET is available to ensure guests do not inherit host counters, accompanied by tests and documentation; dev-container and test harness upgrades aligning libseccomp and cargo-deny with seccomp tests enabled on aarch64; refactoring KVM logic into a dedicated Kvm struct for centralized checks and access control; improved error handling and debugging information for uffd examples to aid troubleshooting; libseccomp usage licensing/documentation update; and a policy update marking Firecracker v1.8 as unsupported. All changes are accompanied by tests and documentation to improve security, maintainability, and developer experience.
January 2025
10 Commits • 6 Features
Jan 1, 20252025-01 monthly summary: Delivered security and reliability improvements for Firecracker with aarch64-focused enhancements, refactors, and developer-experience upgrades. Key items include implementing reset of CNTPER/physical counter on VM boot when KVM_CAP_COUNTER_OFFSET is available to ensure guests do not inherit host counters, accompanied by tests and documentation; dev-container and test harness upgrades aligning libseccomp and cargo-deny with seccomp tests enabled on aarch64; refactoring KVM logic into a dedicated Kvm struct for centralized checks and access control; improved error handling and debugging information for uffd examples to aid troubleshooting; libseccomp usage licensing/documentation update; and a policy update marking Firecracker v1.8 as unsupported. All changes are accompanied by tests and documentation to improve security, maintainability, and developer experience.
December 2024
5 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for firecracker-microvm/firecracker: Delivered a libseccomp backend to replace the previous seccompiler, achieving better performance and smaller BPF code, with build and release notes updated. Implemented internal error handling improvements by refactoring to idiomatic Rust (std::io::Error) and introducing a bincode::Error alias to simplify deserialization error paths. Restored AMD_GENOA CPU feature switch case in tests to ensure correct behavior after refactor. These changes collectively enhance runtime efficiency, reliability, and maintainability, with clearer release notes and improved test coverage.
5 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for firecracker-microvm/firecracker: Delivered a libseccomp backend to replace the previous seccompiler, achieving better performance and smaller BPF code, with build and release notes updated. Implemented internal error handling improvements by refactoring to idiomatic Rust (std::io::Error) and introducing a bincode::Error alias to simplify deserialization error paths. Restored AMD_GENOA CPU feature switch case in tests to ensure correct behavior after refactor. These changes collectively enhance runtime efficiency, reliability, and maintainability, with clearer release notes and improved test coverage.
December 2024
November 2024
14 Commits • 5 Features
Nov 1, 2024November 2024: Delivered cross-architecture reliability improvements, security hardening, and tooling enhancements for Firecracker. Focused on portability across host/guest architectures, kernel variations, and kernel page sizes, while simplifying maintenance and improving testability. These contributions reduce risk in diverse deployment environments and accelerate future iterations.
November 2024
14 Commits • 5 Features
Nov 1, 2024November 2024: Delivered cross-architecture reliability improvements, security hardening, and tooling enhancements for Firecracker. Focused on portability across host/guest architectures, kernel variations, and kernel page sizes, while simplifying maintenance and improving testability. These contributions reduce risk in diverse deployment environments and accelerate future iterations.
October 2024
5 Commits • 2 Features
Oct 1, 2024For 2024-10, delivered performance stability improvements and throughput enhancements for the firecracker project. Key outcomes include restoring a stable linux_5.10-pinned AMI on m6i.metal to address performance instability, introducing configurable Virtio-net queue sizing with a larger default queue, and adding a host-vs-guest CPU features integration test for aarch64. These workstreams increased VM reliability, network throughput, and ARM platform coverage. Documentation and changelog updates accompany the changes, reinforcing observability and maintainability. Overall impact: improved stability, scalable networking throughput, and broader ARM compatibility driving predictable performance for customers.
5 Commits • 2 Features
Oct 1, 2024For 2024-10, delivered performance stability improvements and throughput enhancements for the firecracker project. Key outcomes include restoring a stable linux_5.10-pinned AMI on m6i.metal to address performance instability, introducing configurable Virtio-net queue sizing with a larger default queue, and adding a host-vs-guest CPU features integration test for aarch64. These workstreams increased VM reliability, network throughput, and ARM platform coverage. Documentation and changelog updates accompany the changes, reinforcing observability and maintainability. Overall impact: improved stability, scalable networking throughput, and broader ARM compatibility driving predictable performance for customers.
October 2024
May 2023
1 Commits • 1 Features
May 1, 2023May 2023 monthly summary for firecracker (firecracker-microvm/firecracker): Focused on enhancing CPU topology validation for microVMs by introducing hwloc-backed topology output for x86_64 and aarch64, expanding test coverage and cross-arch validation. This work strengthens correctness guarantees for CPU topology mapping in microVMs and lays groundwork for more reliable performance profiles.
May 2023
1 Commits • 1 Features
May 1, 2023May 2023 monthly summary for firecracker (firecracker-microvm/firecracker): Focused on enhancing CPU topology validation for microVMs by introducing hwloc-backed topology output for x86_64 and aarch64, expanding test coverage and cross-arch validation. This work strengthens correctness guarantees for CPU topology mapping in microVMs and lays groundwork for more reliable performance profiles.
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Quality Metrics
Correctness95.2%
Maintainability92.8%
Architecture92.2%
Performance90.8%
AI Usage20.8%
Skills & Technologies
Programming Languages
AssemblyBashCC++CSVDockerfileJSONMarkdownPythonRust
Technical Skills
A/B TestingA/B testingAPI DesignAPI DevelopmentAPI TestingAPI designAPI developmentARM ArchitectureAutomationBPFBuild EngineeringBuild System ConfigurationBuild SystemsBuildkiteC
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