Staff Software Engineer (.NET)

Chainguard is the trusted source for open source, delivering hardened and secure builds of software. They are seeking a Staff Software Engineer to focus on the .NET ecosystem, contributing to the technical direction for their .NET libraries factory and building systems and tooling for internal teams.

Responsibilities:

• Own architecture and direction for .NET ecosystem infrastructure, enabling secure, reproducible build, test, and distribution workflows for .NET libraries and SDKs
• Design and maintain automation for building, updating, validating, and publishing .NET artifacts (NuGet packages), including vulnerability scanning, remediation, SBOMs, and provenance
• Build internal developer tools (dotnet build and MSBuild tasks/targets, NuGet tooling, CLIs, code generators) that improve how we build and maintain .NET packages at scale
• Integrate deeply with dotnet projects, NuGet, and artifact repositories, solving complex dependency and version-resolution issues in large codebases and mono-repos
• Collaborate with product and engineering leadership to shape the .NET libraries roadmap and deliver on key business outcomes for Chainguard Libraries
• Mentor and unblock other engineers through design reviews, documentation, and hands-on debugging of build and infrastructure issues
• Partner with Platform, Delivery, Sustaining, and Security to ensure .NET pipelines and services meet reliability and security expectations

Requirements:

• 8+ years working in the .NET ecosystem (C# or similar) on build systems, packaging, or developer tooling, ideally on platform/infra or ecosystem teams
• Proven experience building and owning MSBuild extensions, NuGet tooling, CI/CD automation, or internal frameworks/tools for .NET libraries or services
• Deep familiarity with building, publishing and consuming in the .NET ecosystem (multi-project/solution builds, dependency graphs, publishing to registries)
• Strong background in orchestrating large codebases or mono-repos and fixing dependency and build failures in production environments
• Proficiency in Go for build orchestration tooling, CLIs, and automation — the team's primary language for pipeline and glue code
• Experience with Terraform for managing infrastructure as code
• Demonstrated ability to debug toolchain, compiler, and packaging issues at scale and drive them to resolution
• Experience with cloud-native environments: containers (Docker/OCI, Kubernetes), public cloud (GCP, AWS, or Azure), and modern CI/CD systems (e.g., GitHub Actions, Argo, Tekton, or similar)
• Background in DevOps, SRE, or platform engineering — experience at the intersection of build systems and production reliability is a core expectation, not a nice-to-have
• Excellent communication in a remote, distributed setup. Comfortable working across product, infra, and security, and mentoring peers at senior levels
• A staff-level ownership mindset: you define direction, own critical outcomes, and thrive in an early, high-impact area where engineers help set the roadmap
• Systems thinking mindset: comfortable directing, reviewing, and validating software regardless of how it's produced — including AI-assisted workflows — and owning outcomes end-to-end
• Open source contributions in the .NET ecosystem (libraries, build tools, packaging, or related infrastructure)
• Experience building and distributing widely used libraries, SDKs, or runtimes
• Familiarity with software supply chain security: SLSA, SBOMs, sigstore, provenance, attestations
• Exposure to Linux distribution and packaging ecosystems or reproducible build systems (e.g., Alpine, Wolfi, Debian, Bazel, Nix)